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1 aat2601b data sheet total power solution f or portable a pp lications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 general description the aat2601b is a member of skyworks' total power management ic (tpmic tm ) product family. it contains a single-cell lithium ion/polymer battery charger, a fully integrated step-down converter and 5 low dropout (ldo) regulators. the device also includes 2 load switches for dynamic power path/sleep mode operation, making it ideal for small handheld portable navigation devices. the battery charger is a complete thermally regulated constant current/constant voltage linear charger. it includes an integrated pass device, reverse blocking pro- tection, high accuracy current and voltage regulation, charge status, and charge termination. the charging current, charge termination current, and recharge volt- age are programmable with an external resistor and/or by a standard i 2 c interface. the step-down dc/dc converter is integrated with inter- nal compensation and operates at a switching frequency of 1.5mhz, thus minimizing the size of external compo- nents while keeping switching losses low and efficiency greater than 92%. the five ldos offer 60db power supply rejection ratio (psrr) and low noise operation making them suitable for powering noise-sensitive loads. all six voltage regulators operate with low quiescent cur- rent. the total no load current when the step-down con- verter and 2 ldos are enabled is only 170 a. the aat2601b is available in a thermally enhanced low profile 5x5x0.75mm 36-pin tqfn package. features ? voltage regulator v in range: 4.5v to 6v ? complete power integration ? integrated load switches to power converters from ac adapter or battery automatically ? low standby current ? 170 a (typ) w/ buck, ldo1, and ldo2 active, no load ? one step-down buck converter ? 1.8v, 300ma output ? 1.5mhz switching frequency ? fast turn-on time (100 s typ) ? five ldos programmable with i 2 c ? ldo1: 3.3v, 300ma programmable with i 2 c ? ldo2: 1.2v, 150ma ? ldo3: 1.2v, 150ma ? ldo4: 3.3v, 150ma programmable with i 2 c ? ldo5: 3.3v, 150ma programmable with i 2 c ? psrr: 60db@10khz ? noise: 50 vrms for ldo3, ldo4, and ldo5 ? one battery charger ? digitized thermal regulation ? charge current programming up to 1.4a ? charge current termination programming ? automatic trickle charge for battery preconditioning (2.8v cutoff) ? adapter ok (adpp) and reset (reset) timer outputs ? separate enable pins for supply outputs ? over-current protection ? over-temperature protection ? 5x5mm tqfn55-36 package applications ? digital cameras ? gps and pnd ? handheld instruments ? pdas and handheld computers ? portable media players
2 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 typical application ldo2 enable ldo1 enable ldo4 ldo5 enable enable enable ldo3 enable step-down buck chgin uvlo bat pgnd sysout 100m 500m pvin lx outbuck out1 out2 vin vin vin vin vin vin out3 out4 out5 ref avin2 en5 en4 en3 en_test en_hold reset ref ref ref ref ref ref cnoise agnd avin1 vin i 2 c and enable control en_key on_key sda scl iset ref charger control stat adpp enbat use_usb ts sysout ldo ct en2 to avin1, avin2, pvin 10f 5v from a c adapter or usb port system supply 10f 1 cell li+ battery + - to sysout to sysout to sysout 10f 0.01f 4.7f 3.3h 1.8v 300ma 4.7f 4.7f 10f 10f 22f 1.2v 150ma 1.24k 10kw ntc for bat temp sense 0.1f 100k to out1 100k to sysout 100k to sysout 100k to sysout c 3.3v 300ma 3.3v 150ma 1.2v 150ma 3.3v 150ma
3 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 pin descriptions pin # symbol function 1 en_test similar to en_hold but intended for use with the automatic tester or as a hands free enable input pin indi- cating hands free phone operation with a headset. it is also internally pulled to gnd when oating. 2 en_hold enable for the system. en_hold must be held high by the processor to maintain core power. it is internally pulled to gnd when oating. 3 en_key enable for the system. an internal pull-up resistor keeps the pin pulled up to an internal supply to keep the system off when there is no chgin input. connect a normally-open pushbutton switch from this pin to gnd. there is an internal 300ms debounce delay circuit to lter noise. 4 on_key buffered logic output of the en_key pin with a logic signal from ground to out1. 5 en2 enable for ldo2 (internally pulled low when oating). 6 en3 enable for ldo3 (internally pulled low when oating). 7 en4 enable for ldo4 (internally pulled low when oating). 8 en5 enable for ldo5 (internally pulled low when oating). 9 out5 output for ldo5 (when shut down, pulled down with 10k ? ) 10 out4 output for ldo4 (when shut down, pulled down with 10k ? ) 11 avin2 analog voltage input. must be tied to sysout on the pcb. 12 out3 output for ldo3. 13 out2 output for ldo2. 14 avin1 analog voltage input. must be tied to sysout on the pcb. 15 out1 output for ldo1. 16 agnd signal ground. 17 cnoise noise bypass pin for the internal reference voltage. connect a 0.01 f capacitor to agnd. 18 reset reset is the open drain output of a 50ms reset timer. reset is released after the 50ms timer times out. reset is active low and is held low during shutdown. reset should be tied to a 10k or larger pullup to outbuck. 19 adpp open drain output. will pull low when v chgin > 4.5v. when this happens, depending on the status of the use_usb pin, the charge current will be reset to the default values (see battery charger and i 2 c serial interface and programmability section) 20 lx step-down buck converter switching node. connect an inductor between this pin and the output. 21 pgnd power ground for step-down buck converter. 22 pvin input power for step-down buck converter. must be tied to sysout. 23 outbuck feedback input for the step-down buck converter. 24, 25 sysout system power output. connect to the input voltage pins pin, avin1/2 for the step-down converter and ldos and other external supply requirements. 26, 27 bat connect to a lithium ion battery. 28 chgin power input from either external adapter or usb port. 29 use_usb when pulled high, fast charge current is set to 100ma regardless of the resistor value present on the iset pin. additionally, the chgin-sysout ldo will be disabled and the bat-sysout load switch will be enabled. 30 enbat active low enable for the battery charger (internally pulled low when oating) 31 ts battery temperature sense pin with 75 a output current. connect the battery?s ntc resistor to this pin and ground. 32 iset charge current programming input pin (tie a 1.24k to gnd for 800ma fast charge current). can be used to monitor charge current. 33 ct charger safety timer pin. a 0.1 f ceramic capacitor should be connected between this pin and gnd. con- nect directly to gnd to disable the timer function. 34 stat battery charging status pin output. connected internally between gnd and out1. used to monitor battery charge status. 35 sda i 2 c serial data pin, open drain; requires a pullup resistor. 36 scl i 2 c serial clock pin, open drain; requires a pullup resistor. ep ep the exposed thermal pad (ep) must be connected to board ground plane and pins 16 and 21. the ground plane should include a large exposed copper pad under the package for thermal dissipation (see package outline).
4 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 pin configuration tqfn55-36 (top view) en_test en_hold en_key on_key en2 en3 en4 en5 out5 bat bat sysout sysout outbuc k pvin pgnd lx adpp scl sda stat ct iset ts enbat use_usb chgin out4 avin2 out3 out2 avin1 out1 agnd cnoise reset 1 2 3 4 5 6 7 8 9 27 26 25 24 23 22 21 20 19 10 11 12 13 14 15 16 17 18 36 35 34 33 32 31 30 29 28
5 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 absolute maximum ratings 1 t a = 25c unless otherwise noted. symbol description value units v in input voltage, chgin, bat -0.3 to 6.5 v power and logic pins maximum rating v in + 0.3 v t a operating junction temperature range -40 to 85 c t s storage temperature range -65 to 150 c t lead maximum soldering temperature (at leads, 10 sec) 300 ? c recommended operating conditions 2 symbol description value units ja thermal resistance 25 ? c/w p d maximum power dissipation 4 w 1. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at c onditions other than the operating conditions specified is not implied. only one absolute maximum rating should be applied at any one time. 2. thermal resistance was measured with the aat2601b device on the 4-layer fr4 evaluation board in a thermal oven. the amount o f power dissipation which will cause the thermal shutdown to activate will depend on the ambient temperature and the pc board layout ability to dissipate the heat. see figures 11-14.
6 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 electrical characteristics 1 v in = 5v, v bat = 3.6v, -40 ? c t a +85 ? c, unless noted otherwise. typical values are t a = 25 ? c. symbol description conditions min typ max units power supply v in chgin input voltage 4.5 6 v i q battery standby current buck, ldo1 + ldo2, no load 170 a i shdn battery shutdown current en_test, en_hold, en2, en3, en4, en5 = gnd, en_key oating 10.0 a uvlo under-voltage lockout for chgin chgin rising 4.25 4.5 v chgin falling 4.15 v battery under-voltage lockout bat rising 2.6 v bat falling 2.35 v i bat leakage current from bat pin v bat = 4v, v chgin = 0v 2 5 a startup timers reset reset timer initiated when out1 = 90% of nal value 35 ms charger voltage regulation v bat_reg output charge voltage regulation 0 ? c t a +70 ? c 4.158 4.200 4.242 v v min preconditioning voltage threshold (no trickle charge option available) 2.6 2.8 3.0 v v rch battery recharge voltage threshold i 2 c recharge code = 00 (default) 4.00 v i 2 c recharge code = 01 4.05 v i 2 c recharge code = 10 4.10 v i 2 c recharge code = 11 4.15 v charger current regulation i ch_cc constant-current mode charge current r iset = 1.24k (for 0.8a), use_usb = low, i 2 c iset code = 000, v bat = 3.6v, v chgin = 5.0v 720 800 880 ma use_usb = high, i 2 c iset code = 000, v bat = 3.6v 85 100 115 ki_set charge current set factor: i ch_cc /i iset constant current mode, v bat = 3.6v 800 ma/ma i ch_pre preconditioning charge current r iset = 1.24k ? , use_usb = low 12 % i ch_cc i 2 c iset code = 000, use_usb = high 50 ma i ch_term charge termination threshold current i 2 c term code = 00 (default) 5 % i ch_cc i 2 c term code = 01 10 i 2 c term code = 10 15 i 2 c term code = 11 20 charging devices r ds(on) charging transistor on resistance v in = 5v 0.6 0.9 ? logic control / protection v en_hold, v en_key, v en_test input high threshold 1.4 v input low threshold 0.4 v v adpp output low voltage pin sinks 4ma 0.4 v i adpp output pin current sink capability 8ma v stat output high voltage v out1 v i stat output pin current source capability 1.5 ma v ovp over-voltage protection threshold 4.3 v 1. specification over the ?40c to +85c operating temperature range is assured by design, characterization and correlation wit h statistical process controls.
7 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 electrical characteristics 1 v in = 5v, v bat = 3.6v, -40 ? c t a +85 ? c, unless noted otherwise. typical values are t a = 25 ? c. symbol description conditions min typ max units logic control / protection (continued) v ocp over current protection threshold 105 %v cs t c constant current mode time out c ct = 100nf, v chgin = 5v 3 hours t k trickle charge time out t c /8 hours t v constant voltage mode time out 3 hours i ts current source from ts pin 71 75 79 a ts 1 ts hot temperature fault falling threshold 318 331 346 mv hysteresis 25 ts 2 ts cold temperature fault rising threshold 2.30 2.39 2.48 v hysteresis 25 mv t loop_in thermal loop entering threshold 115 c t loop_out thermal loop exiting threshold 85 c t reg thermal loop regulation 100 c load switches / sysout ldo r ds(on),bat-sysout on-resistance of bat-sysout load switch v bat = 3.6v 100 150 m r ds(on),chgin-sysout on-resistance of chgin-sysout load switch v chgin = 4.5v 0.5 0.75 sysout ldo input voltage range 4.5 v sysout ldo output voltage i sysout ? 900ma, v chgin = 4.5v ~ 6.0v 3.4 3.9 4.2 v step-down buck converter v outbuck output voltage accuracy i outbuck = 0 ~ 300ma; v in = 2.7v ~ 5.5v 1.71 1.80 1.89 v i limoutbuck p-channel current limit 0.8 a r ds(on)l high side switch on-resistance 0.8 r ds(on)h low side switch on-resistance 0.8 f osc oscillator frequency t a = 25 c 1.5 mhz t s start-up time from enable to regulation; c outbuck = 4.7 f, c noise = on 100 s ldo1 (3.3v) v out1 output voltage accuracy av in = 3.7v to 4.2v, i out1 = 1ma ~ 300ma -3 +3 % i out1 output current 300 ma i lim1 output current limit 1000 ma v do1 dropout voltage i out1 = 300ma 160 320 mv ? v out1 (v out1 ? v in1 ) line regulation i out1 = 100ma 0.07 %/v ? v out1 load regulation i out1 = 0.5ma ~ 150ma 40 mv psrr power supply rejection ratio i out1 = 10ma, c out1 =22 f, 100hz ~ 10khz 60 db t s start up time from enable to regulation; c out1 = 22 f, c noise = on 175 s 1. specification over the ?40c to +85c operating temperature range is assured by design, characterization and correlation wit h statistical process controls.
8 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 electrical characteristics 1 v in = 5v, v bat = 3.6v, -40 ? c t a +85 ? c, unless noted otherwise. typical values are t a = 25 ? c. symbol description conditions min typ max units ldo2, ldo3 (1.2v) v out2 output voltage accuracy av in = 2.7v to 4.2v, i outx = 1ma ~ 150ma -3 +3 % i out2 output current 150 ma i lim2 output current limit 1000 ma v do2 dropout voltage i out2 = 150ma 150 mv ? v out2 / (v out2 ? v in2 ) line regulation i out2 = 100ma, 3.3v 9 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 basic i 2 c timing diagram t su_sto t su_sta t hd_sta t high t low t su_dat t hd_dat sda scl t buf t hd_sta
10 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 typical characteristics?charger preconditioning threshold voltage vs. temperature temperature (c) v min (v) 2.790 2.792 2.794 2.796 2.798 2.800 2.802 2.804 2.806 2.808 2.810 -50 -25 0 25 50 75 100 v chgin = 6.0v v chgin = 5.5v v chgin = 5.0v v chgin = 4.5v preconditioning charge current vs. temperature (v bat = 2.5v, r iset = 1.24k) temperature (c) i ch_pre (ma) 80 85 90 95 100 105 110 115 -50 -25 0 25 50 75 100 v chgin = 6.0v v chgin = 5.5v v chgin = 5.0v v chgin = 4.5v recharge voltage threshold vs. temperature (v rch set to 4.0v) temperature (c) v rch (v) 3.96 3.97 3.98 3.99 4.00 4.01 4.02 4.03 4.04 4.05 4.06 -50 -25 0 25 50 75 100 v chgin = 6.0v v chgin = 5.5v v chgin = 5.0v v chgin = 4.5v output charge voltage regulation vs. temperatur e (end of charge voltage) temperature (c) v bat_reg (v) 4.16 4.17 4.18 4.19 4.20 4.21 4.22 4.23 4.24 4.25 -50 -25 0 25 50 75 100 v chgin = 6.0v v chgin = 5.5v v chgin = 5.0v v chgin = 4.5v charge termination threshold current vs. temperature temperature (c) i ch_term (ma) 0 10 20 30 40 50 60 70 80 90 100 -50 -25 0 25 50 75 100 v chgin = 6.0v v chgin = 5.5v v chgin = 5.0v v chgin = 4.5v charging current vs. battery voltage (r iset = 1.24k ) battery voltage (v) i ch (ma) 0 100 200 300 400 500 600 700 800 900 2.5 2.9 3.3 3.7 4.1 4.5 v chgin = 6.0v v chgin = 5.5v v chgin = 5.0v v chgin = 4.5v
11 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 typical characteristics?charger (continued) constant current mode charge current vs. temperature (v bat = 3.6v; r iset = 1.24k ) temperature (c) i ch_cc (ma) 300 400 500 600 700 800 900 -50 -25 0 25 50 75 100 v chgin = 6.0v v chgin = 5.5v v chgin = 5.0v v chgin = 4.5v constant current mode charge current vs. input voltage (r iset = 1.24k) chgin voltage (v) i ch_cc (ma) 700 720 740 760 780 800 820 840 860 880 900 4.5 4.75 5 5.25 5.5 5.75 6 v bat = 3.3v v bat = 3.6v v bat = 4.1v
12 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 typical characteristics?step-down buck converter step-down buck efficiency vs. output current (v out = 1.8v; l = 3.3h) output current (ma) efficiency (%) 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 v bat = 2.7v v bat = 4.2v v chgin = 4.5v v chgin = 5.0v v chgin = 6.0v v chgin = 5.5v v bat = 3.6v step-down buck load regulation vs. output current (v out = 1.8v; l = 3.3h) output current (ma) load regulation (%) -0.5 -0.4 -0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 0.4 0.5 1 10 100 1000 v bat = 2.7v v bat = 4.2v v chgin = 4.5v v chgin = 5.0v v chgin = 6.0v v chgin = 5.5v v bat = 3.6v step-down buck line regulation vs. chgin and battery input voltage (v out = 1.8v; l = 3.3h) input v bat , v chgin (v) line regulation (%) -0.5 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 2.5 3 3.5 4 4.5 5 5.5 6 4.2 i out = 1ma i out = 0.01ma i out = 10ma i out = 300ma i out = 200ma i out = 100ma v bat v chgin i out = 50ma step-down buck output voltage vs. temperature (i out = 10ma) temperature (c) v out (v) 1.780 1.785 1.790 1.795 1.800 1.805 1.810 1.815 1.820 1.825 -50 -25 0 25 50 75 100 v chgin = 6.0v v bat = 2.7v v bat = 3.6v v bat = 4.2v v chgin = 4.5v v chgin = 5.5v v chgin = 5.0v v bat line transient response step-down buck (v bat = 3.5v to 4.2v; i out = 300ma; v out = 1.8v; c out = 4.7f) time (100s/div) output voltage (top) (v) input voltage (bottom) (v) 1.76 1.80 1.84 1.88 1.92 3.0 3.5 4.0 4.5 v o v bat v chgin line transient response step-down buck (v chgin = 4.5v to 5.5v; i out = 300ma; v out = 1.8v; c out = 4.7f) time (100s/div) output voltage (top) (v) input voltage (bottom) (v) 1.76 1.78 1.80 1.82 1.84 1.86 4.0 4.5 5.0 5.5 6.0 v o v chgin
13 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 typical characteristics?step-down buck converter (continued) load transient response step-down buck (i outbuck = 10ma to 100ma; v bat = 3.6v; v outbuck = 1.8v; c out = 4.7f) time (100s/div) output voltage (top) (v) output current (bottom) (ma) 1.60 1.70 1.80 1.90 2.00 0 50 100 v o i o load transient response step-down buck (i outbuck = 100ma to 300ma; v bat = 3.6v; v outbuck = 1.8v; c out = 4.7f) time (100s/div) output voltage (top) (v) output current (bottom) (ma) 1.60 1.70 1.80 1.90 2.00 0 100 200 300 v o i o
14 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 typical characteristics?ldo1 ldo1 load regulation vs. output current (v out = 3.3v) output current (ma) load regulation (%) -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1 10 100 1000 v bat = 4.2v v bat = 3.6v v bat = 3.5v ldo1 line regulation vs. battery input voltage (v out = 3.3v) input voltage v bat (v) line regulation (%) -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 i out = 1ma i out = 50ma i out = 100ma i out = 200ma i out = 300ma ldo1 output voltage vs. temperature (i out = 10ma) temperature (c) output voltage v out (%) -50 -25 0 25 50 75 100 -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 v bat = 4.2v v bat = 3.6v v bat = 3.5v ldo1 dropout characteristics vs. battery input voltage (v out = 3.3v) input voltage v bat (v) output voltage v out (v) 3.5 3.6 3.7 3.3 3.4 3.8 3.9 3.260 3.265 3.270 3.275 3.280 3.285 3.290 3.295 3.300 3.305 i out = 1ma i out = 50ma i out = 100ma i out = 200ma i out = 300ma ldo1 dropout voltage vs. output current (v out = 3.3v) output current (ma) dropout voltage (mv) 0 20 40 60 80 100 120 140 160 180 200 0 50 100 150 200 250 300 -40c 25c 85c load transient response (10ma to 100ma; v bat = 3.6v; v out = 3.3v; c out = 22f) time (100s/div) output voltage (top) (v) load current (bottom) (50ma/div) 3.26 3.28 3.30 3.32 3.34 0 50 100 v o i o
15 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 typical characteristics?ldo1 (continued) load transient response (100ma to 300ma; v bat = 3.6v; v out = 3.3v; c out = 22f) time (100s/div) output voltage (top) (v) load current (bottom) (100ma/div) 3.22 3.26 3.30 3.34 3.38 0 100 200 300 v o i o
16 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 typical characteristics?ldo2 ldo2 load regulation vs. output current (v out = 1.2v) output current (ma) load regulation (%) -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1 10 100 1000 v bat = 4.2v v bat = 3.6v v bat = 3.0v ldo2 line regulation vs. battery input voltage (v out = 1.2v) input voltage v bat (v) line regulation (%) -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 i out = 1ma i out = 50ma i out = 100ma i out = 150ma ldo2 output voltage vs. temperature (i out = 10ma) temperature (c) output voltage v out (%) -50 -25 0 25 50 75 100 -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 v bat = 4.2v v bat = 3.6v v bat = 3.0v ldo2 dropout voltage vs. output current (v out = 1.2v) output current (ma) dropout voltage (mv) 0 20 40 60 80 100 120 140 160 180 200 0 25 50 75 100 125 150 -40c 25c 85c load transient response (10ma to 150ma; v bat = 3.6v; v out = 1.2v; c out = 4.7f) time (100s/div) output voltage (top) (v) load current (bottom) (50ma/div) 1.16 1.18 1.20 1.22 1.24 0 50 100 150 v o i o
17 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 typical characteristics?ldo5 ldo5 load regulation vs. output current (v out = 3.3v) output current (ma) load regulation (%) -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1 10 100 1000 v bat = 4.2v v bat = 3.6v v bat = 3.5v ldo5 line regulation vs. battery input voltage (v out = 3.3v) input voltage v bat (v) line regulation (%) -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 i out = 1ma i out = 50ma i out = 100ma i out = 150ma ldo5 output voltage vs. temperature (i out = 10ma) temperature (c) output voltage v out (%) -50 -25 0 25 50 75 100 -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 v bat = 4.2v v bat = 3.6v v bat = 3.5v ldo5 dropout characteristics vs. battery input voltage (v out = 3.3v) input voltage v bat (v) output voltage v out (v) 3.5 3.6 3.7 3.3 3.4 3.8 3.9 3.260 3.265 3.270 3.275 3.280 3.285 3.290 3.295 3.300 3.305 i out = 1ma i out = 50ma i out = 100ma i out = 150ma ldo5 dropout voltage vs. output current (v out = 3.3v) output current (ma) dropout voltage (mv) 0 20 40 60 80 100 120 140 160 180 200 0 25 50 75 100 125 150 -40c 25c 85c load transient response (10ma to 75ma; v bat = 3.6v; v out = 3.3v; c out = 4.7f) time (100s/div) output voltage (top) (v) load current (bottom) (50ma/div) 3.26 3.28 3.30 3.32 3.34 0 50 100 v o i o
18 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 typical characteristics?ldo5 (continued) load transient response (75ma to 150ma; v bat = 3.6v; v out = 3.3v; c out = 4.7f) time (100s/div) output voltage (top) (v) load current (bottom) (50ma/div) 3.22 3.26 3.30 3.34 3.38 0 50 100 150 v o i o
19 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 typical characteristics?general quiescent current vs. input voltage (v out = 1.8v; l = 3.3h) input v bat , v chgin (v) quiescent current (a) 0 50 100 150 200 250 300 350 400 450 500 2.7 3.2 3.7 4.2 4.7 5.2 5.7 -40c 25c 85c v bat v chgin start-up sequence (v chgin = 5.0v) time (50s/div) output voltage (2v/div) buck ldo1 ldo2 ldo3 ldo4 ldo5 ldo output voltage noise (no load; power bw: 100~100khz) frequency (hz) noise (v rms ) 0.00 0.60 1.20 1.80 2.40 3.00 3.60 4.20 4.80 5.40 6.00 100 1000 10000 100000 ldo output voltage noise (i out3 = 10ma, power bw = 100~100khz) frequency (hz) noise (v rms ) 0.00 0.60 1.20 1.80 2.40 3.00 3.60 4.20 4.80 5.40 6.00 100 1000 10000 100000 ldo power supply rejection ratio, psrr (i out3 = 10ma, bw = 100~100khz) frequency (hz) magnitude (db) 0 15 30 45 60 75 90 105 120 135 150 100 1000 10000 100000
20 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 functional block diagram ldo2 enable ldo1 enable ldo4 ldo5 enable enable enable ldo3 enable buck chgin uvlo bat pgnd sysout 100 m 500m pvin lx outbuck out1 out2 vin vin vin vin vin vin out3 out4 out5 ref avin2 en5 en4 en3 en_test en_hold reset ref ref ref ref ref ref cnoise agnd avin1 vin i 2 c and enable control en_key on_key sda scl iset ref charger control stat adpp enbat use_usb ts sysout ldo ct en2 functional description the aat2601b is a complete power management solu- tion. it seamlessly integrates an intelligent, stand-alone cc/cv (constant current/constant voltage), linear-mode single-cell battery charger with one step-down buck con- verter and five low-dropout (ldo) regulators to provide power from either a wall adapter or a single-cell lithium ion/polymer battery. internal load switches allow the ldo regulators and dc-dc converter to operate from the best available power source of either an ac wall adapter, usb port supply or battery. if only the battery is available, then the voltage regula- tors and converter are powered directly from the battery through a 100m load switch. (the charger is put into sleep mode and draws less than 1 a quiescent current.)
21 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 if the system is connected to a wall adapter, then the voltage converters are powered directly from the adapt- er through a 500m load switch and the battery is dis- connected from the voltage converter inputs. this allows the system to operate regardless of the charging state of the battery or with no battery. system output (sysout) intelligent control of the integrated load switches is managed by the switch control circuitry to allow the step-down converter and the ldos to have the best available power source. when the chgin pin voltage is above 4.5v, the system automatically turns on and the power to the sysout pin will be provided by either the chgin pin or the bat pin. when the use_usb pin is low, chgin provides power to sysout through an internal ldo regulated to 3.9v. when the use_usb pin is high or if forced through use of an i 2 c command, the bat pin is shorted to sysout through a 100m switch. if a chgin voltage is not present and the system is enabled, sysout will be shorted to bat. this system allows the step-down converter and ldos to always have the best available source of power. this also allows the voltage converters to operate with no battery, or with a battery voltage that falls below the precondi- tion trickle charge threshold. typical power up sequence the aat2601b supports a variety of push-button or enable/disable schemes. a typical startup and shutdown process proceeds as illustrated in figures 1 and 2. system startup is initiated whenever one of the following condi- tions occurs: 1) a push-button is used to assert en_key low. 2) a valid supply (>chgin uvlo) is connected to the charger input chgin. 3) a hands free device or headset is connected, assert- ing en_test high. the startup sequence for the aat2601b buck and ldo1 is typically initiated by pulling the en_key pin low with a pushbutton switch, as shown in figure 1. the buck is the first block to be turned on. when the output of the buck reaches 90% of its final value, then ldo1 is enabled. when ldo1 reaches 90% of its final value, the 65ms reset timer is initiated holding the microproces- sor in reset. when the reset pin goes high, the p can begin a power up sequence. after the startup sequence has commenced, ldo2, ldo3, ldo4, and ldo5 can be enabled and disabled as desired using their independent enable pins, even while the buck and ldo1 are still starting up. however, if they are shut down, then ldo2, ldo3, ldo4, and ldo5 cannot be enabled. the p must pull the en_hold signal high before the en_key signal can be released by the push-button. this procedure requires that the push-button be held until the p assumes control of en_hold, providing protection against inadvertent momentary assertions of the push- button. once en_hold is high the startup sequence is complete. if the p is unable to complete its power-up routine successfully before the user lets go of the push- button, the aat2601b will automatically shut down. (en_key and en_hold are or?d internally to enable the two core converters.) alternately, the startup sequence is automatically start- ed without the pushbutton switch when the chgin pin rises above its uvlo threshold. the system cannot be disabled until the voltage at the chgin pin drops below the falling uvlo threshold. thirdly, the en_test pin can be used to start up the device for test purposes or for hands-free operation such as when connecting a headset to the system. typical power down sequence if only the battery is connected and the voltage level is above the bat uvlo , then the en_key pin can be held low in order to power down aat2601b. the user can initiate a shutdown process by pressing the push-button a second time. upon detecting a second assertion of en_key (by depressing the push-button), the aat2601b asserts on_key to interrupt the microprocessor which initiates an interrupt service routine that the user pressed the push-button. if en_test and chgin are both low, the microprocessor then initiates a power- down routine, the final step of which will be to de-assert en_hold, disabling ldo2, ldo3, ldo4, and ldo5. when the voltage at the chgin pin is above the chgin uvlo, the device cannot be powered down. if the volt- age at the chgin pin is below the chgin uvlo, both the en_key and en_hold pins must be held low in order to power down the aat2601b. if ldo2, ldo3, ldo4, and ldo5 have not been disabled individually prior to global power down, then they will be turned off simultaneously with the buck. the outputs of ldo4 and ldo5 are inter- nally pulled to ground with 10k during shutdown to dis- charge the output capacitors and ensure a fast turn-off response time.
22 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 bat chgin en_key uvlo micro processor p on_key out1 en_ hold automatic tester or handsfree operation en_test enable for sysout and regulators en_bat enable for battery charger debounce push-button on switch figure 1: enable function detailed schematic. en_key en_hold outbuck reset 65ms 300ms debounce delay out1 90% regulation en_hold must be held high before en _key can be released . power up sequence on_key 90% regulation power down sequence figure 2: typical power up/down sequence.
23 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 battery charger figure 3 illustrates the entire battery charging profile which consists of three phases. 1. preconditioning current mode (trickle) charge 2. constant current mode charge 3. constant voltage mode charge preconditioning trickle charge battery charging commences only after the aat2601b battery charger checks several conditions in order to maintain a safe charging environment. the system operation flow chart for the battery charger operation is shown in figure 4. the input supply must be above the minimum operating voltage (uvlo) and the enable pin (enbat) must be low (it is internally pulled down). when the battery is connected to the bat pin, the battery charger checks the condition of the battery and deter- mines which charging mode to apply. preconditioning current mode charge current if the battery voltage is below the preconditioning volt- age threshold v min , then the battery charger initiates precondition trickle charge mode and charges the bat- tery at 12% of the programmed constant-current mag- nitude. for example, if the programmed current is 500ma, then the trickle charge current will be 60ma. trickle charge is a safety precaution for a deeply dis- charged cell. it also reduces power dissipation in the internal series pass mosfet when the input-output volt- age differential is at its highest. constant current mode charge current trickle charge continues until the battery voltage reach- es v min . at this point the battery charger begins con- stant-current charging. the current level default for this mode is programmed using a resistor from the iset pin to ground. once that resistor has been selected for the default charge current, then the current can be adjusted through i 2 c from a range of 40% to 180% of the pro- grammed default charge current. programmed current can be set at a minimum of 100ma and up to a maxi- mum of 1a. when the adpp signal goes high, the default i 2 c setting of 100% is reset. if the use_usb signal is high when this happens, the charge current is reset to an internally set 100ma current until the microcontroller sends another i 2 c signal to change the charge current. (see i 2 c programming section). constant voltage mode charge constant current charging will continue until the battery voltage reaches the output charge voltage regulation point v bat_reg . when the battery voltage reaches the regu- lation voltage (v bat_reg ), the battery charger will transition to constant-voltage mode. v bat_reg is factory programmed to 4.2v (nominal). charging in constant-voltage mode will continue until the charge current has reduced to the end of charge termination current programmed using the i 2 c interface (5%, 10%, 15%, or 20%). constant current charge phase constant voltage charge phase preconditioning trickle charge phase i (ma) v (v) preconditioning threshold voltage (v min ) charge termination threshold current (i ch_term ) t (s) battery end of charge voltage regulation (v bat_reg ) fast-charge to top-off charge threshold trickle charge timeout (t k ) constant-current mode charge current (i ch_cc ) preconditioning charge current (i ch_pre ) charge current charge voltage constant current timeout (t c ) constant voltage timeout (t v ) figure 3: current vs. voltage and charger time profile.
24 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 power on reset power input voltage v chgin > v uvlo fault conditions monitoring ov, ot, v ts v ts 1 < < v ts2 preconditioning test v min < v bat current phase test v bat < v bat_reg voltage phase test i ch > i ch_term no no yes no preconditioning (trickle charge) constant current charge mode constant voltage charge mode yes yes yes charge completed charge timer control no recharge test v rch < v bat yes no shut down yes enable yes no no device thermal loop monitor t j > 115c thermal loop current reduction in adp charging mode thermal loop current reduction in c.c. mode no expired t < timeout yes figure 4: system operation flow chart for the battery charger.
25 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 power saving mode after the charge cycle is complete, the battery charger turns off the series pass device and automatically goes into a power saving sleep mode. during this time, the series pass device will block current in both directions to prevent the battery from discharging through the battery charger. the battery charger will remain in sleep mode even if the charger source is disconnected. it will come out of sleep mode if either the battery terminal voltage drops below the v rch threshold, the charger en pin is recycled, or the charging source is reconnected. in all cases, the battery charger will monitor all parameters and resume charging in the most appropriate mode. temperature sense (ts) the ts pin is available to monitor the battery tempera- ture. connect a 10k ntc resistor from the ts pin to ground. the ts pin outputs a 75 a constant current into the resistor and monitors the voltage to ensure that the battery temperature does not fall outside the limits depending on the temperature coefficient of the resistor used. when the voltage goes above 2.39v or goes below 0.331v, the charging current will be suspended. charge safety timer (ct) while monitoring the charge cycle, the aat2601b utilizes a charge safety timer to help identify damaged cells and to ensure that the cell is charged safely. operation is as follows: upon initiating a charging cycle, the aat2601b charges the cell at 12% of the programmed maximum charge until v bat >2.8v. if the cell voltage fails to reach the preconditioning threshold of 2.8v (typ) before the safety timer expires, the cell is assumed to be damaged and the charge cycle terminates. if the cell voltage exceeds 2.8v prior to the expiration of the timer, the charge cycle proceeds into fast charge. there are three timeout periods: 1 hour for trickle charge mode, 3 hours for constant current mode, and 3 hours for constant voltage mode. the ct pin is driven by a constant current source and will provide a linear response to increases in the timing capacitor value. thus, if the timing capacitor were to be doubled from the nominal 0.1 f value, the time-out periods would be doubled. if the programmable watch- dog timer function is not needed, it can be disabled by terminating the ct pin to ground. the ct pin should not be left floating or unterminated, as this will cause errors in the internal timing control circuit. the constant cur- rent provided to charge the timing capacitor is very small, and this pin is susceptible to noise and changes in capacitance value. therefore, the timing capacitor should be physically located on the printed circuit board layout as close as possible to the ct pin. since the accuracy of the internal timer is dominated by the capacitance value, a 10% tolerance or better ceramic capacitor is recom- mended. ceramic capacitor materials, such as x7r and x5r types, are a good choice for this application. programming charge current (iset) the default constant current mode charge level is user programmed with a set resistor placed between the iset pin and ground. the accuracy of the constant charge cur- rent, as well as the preconditioning trickle charge cur- rent, is dominated by the tolerance of the set resistor. for this reason, a 1% tolerance metal film resistor is recom- mended for the set resistor function. the constant charge current levels from 100ma to 1a may be set by selecting the appropriate resistor value from table 1 and figure 5. the iset pin current to charging current ratio is 1 to 800. it is regulated to 1.25v during constant current mode unless changed using i 2 c commands. it can be used as a charging current monitor, based on the equation: i ch = 800 ? ? ? ? ? v iset r iset during preconditioning charge, the iset pin is regulated to 12% of the fast charge current i set voltage level (figure 5), but the equation stays the same. during con- stant voltage charge mode, the iset pin voltage will slew down and be directly proportional to the battery current at all times. constant charging current i ch_cc (ma) set resistor value (k ? ) 100 10 200 4.99 300 3.32 400 2.49 500 2 600 1.65 700 1.43 800 1.24 900 1.1 1000 1 table 1: constant current charge vs. i set resistor value.
26 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 reverse battery leakage the aat2601b includes internal circuitry that eliminates the need for series blocking diodes, reducing solution size and cost as well as dropout voltage relative to con- ventional battery chargers. when the input supply is removed or when chgin goes below the aat2601b?s under voltage-lockout (uvlo) voltage, or when chgin drops below v bat , the aat2601b automatically reconfig- ures its power switches to minimize current drain from the battery. adapter power indicator (adpp) this is an open drain output which will pull low when v chgin > 4.5v. when this happens, depending on the sta- tus of the use_usb pin, the charge current will be reset to the default iset values or i 2 c programmed values. charge status output (stat) the aat2601b provides battery charging status via a status pin. this pin is a buffered output with a supply level up to the ldo1 output. the status pin can indicate the following conditions: event description stat no battery charging activity low (to gnd) battery charging high (to v out1 ) charging completed low (to gnd) table 2: charge status output (stat). chgin bypass capacitor selection chgin is the power input for the aat2601b battery char- ger. the battery charger is automatically enabled when- ever a valid voltage is present on chgin. in most appli- cations, chgin is connected to either a wall adapter or usb port. under normal operation, the input of the char- ger will often be ?hot-plugged? directly to a powered usb or wall adapter cable, and supply voltage ringing and overshoot may appear at the chgin pin. a high quality capacitor connected from chgin to gnd, placed as close as possible to the ic, is sufficient to absorb the energy. wall-adapter powered applications provide flexibility in input capacitor selection, but the usb specification pres- ents limitations to input capacitance selection. in order to meet both the usb 2.0 and usb otg (on the go) specifications while avoiding usb supply under-voltage conditions resulting from the current limit slew rate (100ma/ s) limitations of the usb bus, the chgin bypass capacitance value must be between 1 f and 4.7 f. ceramic capacitors are often preferred for bypass- ing due to their small size and good surge current rat- ings, but care must be taken in applications that can encounter hot plug conditions as their very low esr, in combination with the inductance of the cable, can create a high-q filter that induces excessive ringing at the chgin pin. this ringing can couple to the output and be mistaken as loop instability, or the ringing may be large enough to damage the input itself. although the chgin pin is designed for maximum robustness and an absolute constant current mode charge current vs. iset resistor (v in = 5v; v bat = 3.6v) iset resistor (k ) i ch_cc (ma) 0 200 400 600 800 1000 1200 1400 0.1 1 10 100 iset voltage vs. battery voltage (chgin = 5.0v, r iset = 1.24k ) battery voltage (v) v iset (v) 0 0.2 0.4 0.6 0.8 1 1.2 1.4 2.5 2.9 3.3 3.7 4.1 4.5 figure 5: constant current mode charge i ch_cc setting vs. i set resistor and i set voltage vs. battery voltage.
27 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 maximum voltage rating of +6.5v for transients, atten- tion must be given to bypass techniques to ensure safe operation. as a result, design of the chgin bypass must take care to ?de-q? the filter. this can be accomplished by connecting a 1 ? resistor in series with a ceramic capacitor (as shown in figure 6a), or by bypassing with a tantalum or electrolytic capacitor to utilize its higher esr to dampen the ringing (as shown in figure 6b). for additional protection, zener diodes with 6v clamp volt- ages may also be used. in any case, it is always critical to evaluate voltage transients at the chgin pin with an oscilloscope to ensure safe operation. thermal considerations the actual maximum charging current is a function of charge adapter input voltage, the state of charge of the battery at the moment of charge, the system supply cur- rent from sysout, and the ambient temperature and the thermal impedance of the package and printed circuit board. the maximum programmable current may not be achievable under all operating parameters. one issue to consider is the amount of current being sourced to the sysout pin from the chgin ldo while the battery is being charged. the aat2601b is offered in a tqfn55-36 package which can provide up to 4w of power dissipation when it is properly bonded to a printed circuit board and has a maximum thermal resistance of 25c/w. many consider- ations should be taken into account when designing the printed circuit board layout, as well as the placement of the charger ic package in proximity to other heat gen- erating devices in a given application design. the ambi- ent temperature around the charger ic will also have an effect on the thermal limits of a battery charging applica- tion. the maximum limits that can be expected for a given ambient condition can be estimated by the follow- ing discussion. first, the maximum power dissipation for a given situation should be calculated: (t j(max) - t a ) p d(max) = ja where: p d(max) = maximum power dissipation (w) ja = package thermal resistance (c/w) t j(max) = maximum device junction temperature (c) [150c] t a = ambient temperature (c) to usb port or wall adapter to usb port or wall adapter 1f ceramic (xr5/xr7) 4.7f esr > 1 1 chgin chgin (a) (b) figure 6: hot plug requirements.
28 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 next, the power dissipation for the charger can be cal- culated by the following equation: p d = (v chgin - v bat ) i ch_cc + (v chgin i op ) + (v chgin - v sysout ) i sysout + (v sysout - v out1 ) i out1 + (v sysout - v out2 ) i out2 + (v sysout - v out3 ) i out3 + (v sysout - v out4 ) i out4 + (v sysout - v out5 ) i out5 + i outbuck 2 r ds(on)l + r ds(on)h [v sysout - v outbuck ] v sysout v outbuck v sysout ? ? ? ? where: p d = total power dissipation by the device v chgin = chgin input voltage v bat = battery voltage at the bat pin i ch_cc = constant charge current programmed for the application i op = quiescent current consumed by the ic for normal operation [0.5ma] v sysout and i sysout = output voltage and load current from the sysout pin for the system ldos and step- down converter [3.9v out for sysout] r ds(on)h and r ds(on)l = on-resistance of step-down high and low side mosfets [0.8 ? each] v outx and i outx = output voltage and load currents for the ldos and step-down converter [3v out for each ldo] by substitution, we can derive the maximum charge cur- rent before reaching the thermal limit condition (t reg = 100c, thermal loop regulation). the maximum charge current is the key factor when designing battery charger applications. i ch_cc(max) = - [(v sysout - v out1 ) i out1 ] - (v sysout - v out2 ) i out2 - [(v sysout - v out3 ) i out3 ] - (v sysout - v out4 ) i out4 - (v sysout - v out5 ) i out5 v chgin - v bat - i outbuck 2 r ds(on)l + r ds(on)h (v sysout - v outbuck ) v sysout v outbuck v sysout ? ? ? ? ? ? ? ? (t reg - t a ) ja - (v chgin i op ) - (v chgin - v sysout ) i sysout ) in general, the worst condition is when there is the greatest voltage drop across the charger, when battery voltage is charged up to just past the preconditioning voltage threshold and the ldos and step-down con- verter are sourcing full output current. thermal overload protection the aat2601b integrates thermal overload protection circuitry to prevent damage resulting from excessive thermal stress that may be encountered under fault con- ditions, for example. this circuitry disables all regulators if the aat2601b die temperature exceeds 140c, and prevents the regulators from being enable until the die temperature drops by 15c (typ). synchronous step-down converter (buck) the aat2601b contains a high performance 300ma, 1.5mhz synchronous step-down converter. the step- down converter operates to ensure high efficiency per- formance over all load conditions. it requires only three external power components (c in , c out , and l). a high dc gain error amplifier with internal compensation controls the output. it provides excellent transient response and load/line regulation. transient response time is typically less than 20 s. the converter has soft start control to limit inrush current and transitions to 100% duty cycle at drop out. the step-down converter input pin pvin should be con- nected to the sysout ldo output pin. the output volt- age is internally fixed at 1.8v. power devices are sized for 300ma current capability while maintaining over 90% efficiency at full load. input/output capacitor and inductor apart from the input capacitor that is shared with the ldo inputs, only a small l-c filter is required at the output side for the step-down converter to operate properly. typically, a 3.3 h inductor such as the sumida cdrh2d11np- 3r3nc and a 4.7 f ceramic output capacitor are recom- mended for low output voltage ripple and small compo- nent size. ceramic capacitors with x5r or x7r dielectrics are highly recommended because of their low esr and small temperature coefficients. a 10 f ceramic input capacitor is sufficient for most applications.
29 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 control loop the converter is a peak current mode step-down con- verter. the inner, wide bandwidth loop controls the induc- tor peak current. the inductor current is sensed through the p-channel mosfet (high side) which is also used for short circuit and overload protection. a fixed slope com- pensation signal is added to the sensed current to main- tain stability for duty cycles greater than 50%. the peak current mode loop appears as a voltage programmed current source in parallel with the output capacitor. the output of the voltage error amplifier programs the current mode loop for the necessary peak inductor cur- rent to force a constant output voltage for all load and line conditions. the voltage feedback resistive divider is internal and the error amplifier reference voltage is 0.45v. the voltage loop has a high dc gain making for excellent dc load and line regulation. the internal volt- age loop compensation is located at the output of the transconductance voltage error amplifier. soft start soft start slowly increases the internal reference voltage when the input voltage or enable input is initially applied. it limits the current surge seen at the input and elimi- nates output voltage overshoot. current limit and over-temperature protection for overload conditions the peak input current is limited. as load impedance decreases and the output voltage falls closer to zero, more power is dissipated internally, raising the device temperature. thermal protection com- pletely disables switching when internal dissipation becomes excessive, protecting the device from damage. the junction over-temperature threshold is 140c with 15c of hysteresis. linear ldo regulators (out1-5) the advanced circuit design of the linear regulators has been specifically optimized for very fast start-up and shutdown timing. these proprietary ldos are tailored for superior transient response characteristics. these traits are particularly important for applications which require fast power supply timing. the high-speed turn-on capability is enabled through the implementation of a fast start control circuit, which accelerates the power up behavior of fundamental con- trol and feedback circuits within the ldo regulator. for ldo4 and ldo5, fast turn-off time response is achieved by an active output pull down circuit, which is enabled when the ldo regulator is placed in the shutdown mode. this active fast shutdown circuit has no adverse effect on normal device operation. input/output capacitors the ldo regulator output has been specifically optimized to function with low cost, low esr ceramic capacitors. however, the design will allow for operation over a wide range of capacitor types. the input capacitor is shared with all ldo inputs and the step-down converter. a 10 f is sufficient. a 4.7 f ceramic output capacitor is recom- mended for ldo2-5 and a 22 f output capacitor for ldo1. current limit and over-temperature protection the regulator comes with complete short circuit and thermal protection. the combination of these two internal protection circuits gives a comprehensive safety system to guard against extreme adverse operating conditions.
30 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 i 2 c serial interface and programmability serial interface many of the features of the aat2601b can be controlled via the i 2 c serial interface. the i 2 c serial interface is a widely used interface where it requires a master to initi- ate all the communications with the slave devices. the i 2 c protocol consists of 2 active wire sda (serial data line) and scl (serial clock line). both wires are open drain and require an external pull up resistor to v cc (sysout may be used as v cc ). the sda pin serves i/o function, and the scl pin controls and references the i 2 c bus. i 2 c protocol is a bidirectional bus which allows both read and write actions to take place, but the aat2601b supports the write protocol only. since the protocol has a dedicated bit for read or write access (r/w), when com- municating with aat2601b, this bit must be set to ?0?. the timing diagram in figure 7 depicts the transmission protocol. start and stop conditions start and stop conditions are always generated by the master. prior to initiating a start condition, both the sda and scl pin are idle mode (idle mode is when there is no activity on the bus and sda and scl are pulled to v cc via external resistor). as depicted in figure 7, a start condition is defined to be when the master pulls the sda line low and after a short period pulls the scl line low. a start condition acts as a signal to all ic?s that something is about to be transmitted on the bus. a stop condition, also shown in figure 7, is when the master releases the bus and scl changes from low to high followed by sda low to high transition. the master does not issue an acknowlege and releases the scl and sda pins. ack from slave ack from slave ack from slave start scl sda including r/w bit, chip address = 0x98 stop ack w ack ack 1 1 0 0 1 0 0 0 data chip address register address figure 7: i 2 c timing diagram.
31 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 transferring data every byte on the bus must be 8 bits long. a byte is always sent with a most significant bit first (see figure 8). r/w msb lsb figure 8: bit order. the address is embedded in the first seven bits of the byte. the eighth bit is reserved for the direction of the information flow for the next byte of information. for the aat2601b, this bit must be set to ?0?. the full 8-bit address including the r/w bit is 0x98 (hex) or 10011000 in binary. acknowledge bit the acknowledge bit is the ninth bit of data. it is used to send back a confirmation to the master that the data has been received properly. for acknowledge to take place, the master must first release the sda line, then the slave will pull the data line low as shown in figure 7. serial programming code after sending the chip address, the master should send an 8-bit data stream to select which register to program and then the codes that the user wishes to enter. register 0x00: timer rchg 1 rchg 0 chg 2 chg 1 chg 0 term 1 term 0 register 0x01: not used not used not used not used not used sys ldo1 1 ldo1 0 register 0x02: ldo5 1 ldo5 0 ldo4 1 ldo4 0 ldo3 1 ldo3 0 ldo2 1 ldo2 0 figure 9: serial programming register codes. use_usb pin chg 2 chg 1 chg 0 constant current charge i ch_cc constant current charge as % of i set current 1000 100ma ( xed internally) (default) 0000 800ma (set by i set resistor) 100% (default) x 0 0 1 640ma 80% x 0 1 0 480ma 60% x 0 1 1 320ma 40% x 1 0 0 960ma 120% x 1 0 1 1120ma 140% x 1 1 0 1280ma 160% x 1 1 1 1440ma 180% table 3: chg bit setting for the constant current charge level (assuming i set resistor is set to default 800ma charge current).
32 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 notes concerning the operation of the chg 2 , chg 1 and chg 0 bits or iset code: ? once the part is turned on using the en_key pin (and there is a bat and/or chgin supply), and data is sent through i 2 c, the i 2 c codes in the registers will always be preserved until the part is shut down using the en_hold (going low) or if the bat and chgin supply are removed. ? if the part is turned on by connecting supply chgin (and not through en_key), then when the chgin is removed, the part will shut down and all i 2 c registers will be cleared. if use_usb = l: ? the charge current is set by the iset code in register 0x00, bits 2,3,4. (code 000 will equal 100%) ? if the part has been turned on by en_key and chgin is disconnected then reconnected, it will still contain the code it had before (if it was 60% then it will remain 60%). ? if the part has not been turned on by en_key and chgin is disconnected then reconnected, it will be reset to 100% (since the whole part was shutdown). if use_usb = h: ? iset code 000 in register 0x00, bits 2,3,4 = 100ma. the other codes stay the same as if use_usb=h. ? if the part has been turned on by en_key and chgin is disconnected then reconnected, the iset code will be forced to 000 and the current will be set to 100ma. ? the next time any i 2 c register is programmed (even if it is not for the iset code), the iset code will revert back to what it was before. for example, if the iset code is set to 010 and use_usb=h and the part was turned on with en_key, then when chgin is discon- nected then reconnected, the charger will be set to 100ma. then if any other command is sent, the iset code will remain 010. term 1 term 0 termination current (as % of constant current charge) 0 0 5% (default) 0 1 10% 1 0 15% 1 1 20% table 4: term bit setting for the termination current level. rchg 1 rchg 0 recharge threshold 0 0 4.00v (default) 0 1 4.05v 1 0 4.10v 1 1 4.15v table 5: rchg bit setting for the battery charger recharge voltage level.
33 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 timer charger watchdog timer 0 on (default) 1 off (and reset to zero) table 6: timer bit setting for the charger watchdog timer. ldo1 1 ldo1 0 ldo1 output voltage 0 0 3.30v (default) 0 1 2.90v 1 0 2.85v 1 1 2.80v ldo4 1 ldo4 0 ldo4 output voltage 0 0 3.30v (default) 0 1 2.90v 1 0 2.85v 1 1 2.80v ldo5 1 ldo5 0 ldo5 output voltage 0 0 3.30v (default) 0 1 2.90v 1 0 2.85v 1 1 2.80v table 7: ldo bit setting for ldo output voltage level. sys bit sysout power source 0 if use_usb = h, sysout powered from bat if use_usb = l, sysout powered from chgin 1 sysout always powered from bat table 8: sys bit setting for sysout power path. layout guidance figure 10 is the schematic for the evaluation board. the evaluation board has extra components for easy evalua- tion; the actual bom need for a system is shown in table 9. when laying out the pc board, the following layout guideline should be followed to ensure proper operation of the aat2601b: 1. the exposed pad ep must be reliably soldered to pgnd/agnd and multilayer gnd. the exposed ther- mal pad should be connected to board ground plane and pins 2 and 16. the ground plane should include a large exposed copper pad under the package with vias to all board layers for thermal dissipation. 2. the power traces, including gnd traces, the lx traces and the vin trace should be kept short, direct and wide to allow large current flow. the l1 connec- tion to the lx pins should be as short as possible. use several via pads when routing between layers. 3. the input capacitors (c1 and c2) should be con- nected as close as possible to chgin (pin 28) and pgnd (pin 2) to get good power filtering. 4. keep the switching node lx away from the sensitive outbuck feedback node. 5. the feedback trace for the outbuck pin should be separate from any power trace and connected as closely as possible to the load point. sensing along a high current load trace will degrade dc load regula- tion. 6. the output capacitor c4 and l1 should be connected as close as possible and there should not be any signal lines under the inductor. 7. the resistance of the trace from the load return to the pgnd (pin 2) should be kept to a minimum. this will help to minimize any error in dc regulation due to differences in the potential of the internal signal ground and the power ground.
34 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 quantity value designator footprint description 510 f c1, c2, c3, c14, c15 0603 capacitor, ceramic, x5r, 6.3v, 20% 222 f c9 0805 capacitor, ceramic, 20%, 6.3v, x5r 4 4.7 f c4, c5, c6, c7, c8 0603 capacitor, ceramic, 20%, 6.3v, x5r 3 0.1 f c10, c11, c12 0402 capacitor, ceramic, 16v, 10%, x5r 1 0.01 f c13 0402 capacitor, ceramic, 16v, 10%, x7r 1 3.3 h l1 cdrh2d inductor, sumida cdrh2d11np-3r3nc 9 100k r5, r8, r20, r21, r22, r23, r25, r26, r27 0402 resistor, 5% 8 10k r17, r19, r24, r29, r31, r32, r33, r37 0402 resistor, 5% 1 1.24k r18 0402 resistor, 1% table 9: minimum aat2601b bill of materials.
35 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 j1 header 13x2h 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 j2 header 13x2h en_test 1 en_hol d 2 en_key 3 on- k ey 4 en2 5 en3 6 en4 7 en5 8 out5 9 out4 10 avin2 11 out3 12 out2 13 avin1 14 out1 15 agnd 16 cnoise 17 reset 18 adpp 19 lx 20 pgnd 21 pv i n 22 outbuck 23 sysout 24 sysout 25 bat 26 bat 27 chgin 28 use_usb 29 enb a t 30 ts 31 iset 32 ct 33 stat 34 sda 35 scl 36 ep 37 u1 aat2601b 1 3 2 j11 vbus/vchg c5 4.7 f j4 buck j5 ou t 5 j6 out4 j7 out3 j8 ou t 2 j9 out1 j3 vbatt bat vdig vdig vdig vdig ch g i n chgin vdig bat pw r_ o n hf_pwr rx _en pwr_hold tx_en use_usb tcxo_en ana_en chg_en st a t ba t_i d vana vtcxo vcore acok_n reset_n bat_id vdig pon _n ch g_en use_usb tp2 ch gin tp1 vb att tp3 acok_n tp4 po n _ n tp5 reset_n tp6 st a t _n tp7 gnd tp8 gn d sd a scl sd a 1 scl 2 gnd 3 4 j10 data header vbatt pw r_ h o l d hf_pwr pw r_ o n vdig vrx vtx ana_en tx _en rx_en vba tt tcxo_en vbus vchg vbatt l1 3.3h acok _n pon_n reset _n stat vcore vrx vtx vtcxo vana vdig 1 3 2 j13 rx _en 1 3 2 j14 tx_en 1 3 2 j15 tcxo_en 1 3 2 j16 ana _en 1 3 2 j20 ch g_en 1 3 2 j19 use_usb 1 3 2 j18 pwr_hol d 1 3 2 j17 hf_pwr q1 cm pt3904 sy s o u t buckout ch gin ou t 1 ou t 2 ou t 3 ou t 4 ou t 5 ba t tp9 lx tp10 sysout vdig r34 0 r35 0 r36 0 sw 1 pw r_ o n r30 1k d1 l ed green r31 10k r33 10k 1 3 2 j12 i nt/ext pwr tp11 ext pwr vcore r3 0 r2 0 r4 0 r6 0 r9 0 r10 0 r12 0 r14 0 r7 dnp r11 0 r13 0 r15 0 r16 0 r29 10k r37 10k r17 10k r28 4.75k r5 100k r8 100k r24 10k r19 10k r20 100k r21 100k r22 100k r23 100k r25 100k r26 100k r27 100k sysout c1 10f c2 10f c10 0.1f c11 0.1f c12 0.1f r18 1.24k c13 0.01 f c4 4. 7 f c9 22 f c6 4.7 f c7 4.7 f c8 4.7 f c3 10f r1 0 r32 10k c14 10f tp12 gnd c15 10f (tbd) figure 10: aat2601b evaluation kit schematic.
36 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 figure 11: aat2601b evaluation kit top layer. figure 12: aat2601b evaluation kit mid1 layer.
37 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 figure 13: aat2601b evaluation kit mid2 layer. figure 14: aat2601b evaluation kit bottom layer.
38 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 ordering information package part marking 1 part number (tape and reel) 2 tqfn55-36 9cxyy AAT2601BIIH-T1 skyworks green? products are compliant with all applicable legislation and are halogen-free. for additional information, refer to skyworks de?ition of green , document number sq04-0074. packaging information tqfn55-36 3 0.750 0.050 0.000 + 0.050 - 0.000 0.203 ref 0.200 0.050 0.450 0.050 0.40 bsc 5.000 0.050 5.000 0.050 3.600 0.050 detail "a" 3.600 0.050 top view side view detail "a" bottom view index area (d/2 x e/2) r = 0.1 c = 0.3 all dimensions in millimeters. 1. xyy = assembly and date code. 2. sample stock is generally held on part numbers listed in bold . 3. the leadless package family, which includes qfn, tqfn, dfn, tdfn and stdfn, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing process. a solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder c onnection.
39 aat2601b data sheet total power solution for portable applications skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202181b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 19, 2013 copyright ? 2012, 2013 skyworks solutions, inc. all rights reserved. information in this document is provided in connection with skyworks solutions, inc. (?skyworks?) products or services. these m aterials, including the information contained herein, are provided by skyworks as a service to its customers and may be used for informational purposes only by the customer. skyworks assumes no responsibility fo r errors or omissions in these materials or the information contained herein. sky- works may change its documentation, products, services, speci cations or product descriptions at any time, without notice. skyworks makes no commitment to update the materials or informati on and shall have no responsibility whatsoever for con icts, incompatibilities, or other dif culties arising from any future changes. no license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document . skyworks assumes no liability for any materials, products or information provided here- under, including the sale, distribution, reproduction or use of skyworks products, information or materials, except as may be p rovided in skyworks terms and conditions of sale. the materials, products and information are provided ?as is? without warranty of any kind, whether express, implied, statutory, or otherwise, including fitness for a particular purpose or use, merchantability, performance, quality or non-infringement of any intellectual property right; all such warranti es are hereby expressly disclaimed. skyworks does not warrant the accuracy or completeness of the information, text, graphics or other items contained within these materials. sk yworks shall not be liable for any damages, in- cluding but not limited to any special, indirect, incidental, statutory, or consequential damages, including without limitation , lost revenues or lost profits that may result from the use of the materials or information, whether or not the recipient of materials has been advised of the possibility of such damage. skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the skyworks products could lead to personal injury, death, physical or en- vironmental damage. skyworks customers using or selling skyworks products for use in such applications do so at their own risk and agree to fully indemnify skyworks for any damages resulting from such improper use or sale. customers are responsible for their products and applications using skyworks products, which may deviate from published speci cations as a result of design defects, errors, or operation of products outside of pub- lished parameters or design speci cations. customers should include design and operating safeguards to minimize these and other risks. skyworks assumes no liabi lity for applications assistance, customer product design, or damage to any equipment resulting from the use of skyworks products outside of stated published speci cations or parameters. skyworks, the skyworks symbol, and ?breakthrough simplicity? are trademarks or registered trademarks of skyworks solutions, inc ., in the united states and other countries. third-party brands and names are for identi cation purposes only, and are the property of their respective owners. additional information, including relevant terms and co nditions, posted at www.skyworksinc.com, are incorporated by reference.

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