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aat2603 total power solution for portable applications product datasheet 2603.2008.10.1.2 1 www.analogictech.com general description the aat2603 is a highly integrated power management solution for handheld mobile systems. it provides six regulated voltages from a single-cell lithium-ion/poly- mer battery or a 5v supply. the six outputs are produced by six regulators; two switching step-down regulators and four low-dropout (ldo) regulators. each voltage regulator has its own independent enable pin. the high efficiency step-down regulators are fully inte- grated and switch at a high 1.5 mhz fixed frequency. they automatically transition to variable frequency operation at light loads for improved efficiency. dc-dc1 (buck1) is designed for high output current and low dropout voltage (200mv at 1.2a). dc-dc2 (buck2) is a 600ma regulator with a two step dynamic output voltage capability. one option allows the output voltage of dc-dc2 (buck2) to be set to either 1.0v or 1.3v with the selb2 logic pin. ldo regulators ldo1 and ldo2 can supply up to 400ma of load current with output voltages adjustable down to 1.5v. ldo regulators ldo3 and ldo4 can supply up to 200ma of current and provide good noise and power supply rejection. ldo3 and ldo4 have output voltages externally adjustable down to 1.2v. the aat2603 is available in a pb-free, thermally enhanced 28-pin tqfn44 package and is rated for oper- ation over the -40c to +85c temperature range. features ? v in range: 2.7v to 5.5v ? two step-down regulators ? dc-dc1(buck1): 1.2a, low dropout voltage ? externally adjustable: v fbb1 = 0.6v ? v out range: 0.6v to v inb1 ? fixed: v out = 3.3v ? factory programmable to any two voltage levels from 0.6v to 4.0v ? dc-dc2(buck2): 0.6a, low dropout voltage ? externally adjustable: v fbb2 = 0.6v ? v out range: 0.6v to v inb2 ? fixed: v out = 1.0v[selb2=?0?]/1.3v[selb2=?1?] ? factory programmable to any two voltage levels from 0.6v to 4.0v ? fixed 1.5mhz switching frequency ? internally compensated current mode control ? high efficiency over the entire load range ? four ldo regulators ? ldo1: 400ma ldo ? ldo2: 400ma ldo ? ldo3: 200ma, low noise ldo ? ldo4: 200ma, low noise ldo ? fast turn-on and turn-off time ? short circuit and over-current protection ? over-temperature protection ? temperature range: -40c to +85c ? tqfn44-28 package applications ? handheld gps ? handheld instruments ? pdas and handheld computers ? portable media players ? smart phones
aat2603 total power solution for portable applications product datasheet 2 2603.2008.10.1.2 www.analogictech.com typical application circuit aat2603 inb1 fbb 1 lx2 fbb 2 outl1 outl2 outl3 outl4 fbl 1 fbl 2 fbl3 fbl4 inb2 lx1 enb2 3.3v: 1.2a 1.0v & 1.3v: 600m a 1.2v (minimum): 200ma 1.2v (minimum): 200ma 1.5v (minimum): 400ma 1.5v (minimum): 400ma pgnd2 pgnd 1 agnd byp enl 1 enl 2 enl 3 enl 4 selb 2 enb1 c outl3 4.7f c outl4 4.7f c outl1 4.7f c outl2 4.7f 100k 100k 100k 100k c byp 10nf c inl12 2.2f c outb1 22f l1 3.3h l2 1.2h c outb2 10f inl 34 inl 12 ain c inl34 2.2f 2.7v to 5.5v c ain 2.2f c inb2 4.7f c inb1 4.7f
aat2603 total power solution for portable applications product datasheet 2603.2008.10.1.2 3 www.analogictech.com aat2603 total power solution for portable applications product datasheet 2603.2008.10.1.2 3 www.analogictech.com pin descriptions pin # symbol function 1 lx2 dc-dc2 (buck2) switching node. connect the output inductor to lx2. connected internally to the drains o f both high-side and low-side switches. 2 enb2 dc-dc2 (buck2) enable input. active high. 3 fbb2 dc-dc2 (buck2) feedback input. for externally adjustable versions, connect a resistor divider from buck2 output to fbb2 to agnd to set the buck2 output voltage. 4 enl3 ldo3 enable input. active high. 5 agnd analog ground. connect agnd to pgnd1 and pgnd2 as close as possible to the device. 6 fbl3 ldo3 feedback input. connect a resistor divider from outl3 to fbl3 to agnd to set the ldo3 output voltage. 7 outl3 ldo3 output. should be closely decoupled to agnd with a 4.7 f or greater capacitor. 8 inl34 ldo3 and ldo4 input. should be closely decoupled to agnd with a 2.2 f or greater capacitor. 9 outl4 ldo4 output. should be closely decoupled to agnd with a 4.7 f or greater capacitor. 10 fbl4 ldo4 feedback input. connect a resistor divider from outl4 to fbl4 to agnd to set the ldo4 output voltage. 11 enl4 ldo4 enable input. active high. 12 byp reference bypass. bypass byp to agnd with a 0.01 f or greater capacitor to reduce the ldo1 output noise. 13 enl1 ldo1 enable input. active high. 14 fbl1 ldo1 feedback input. connect a resistor divider from outl1 to fbl1 to agnd to set the ldo1 output voltage. 15 outl1 ldo1 output. should be closely decoupled to agnd with a 4.7 f or greater capacitor. 16 inl12 ldo1 and ldo2 input. should be closely decoupled to agnd with a 2.2 f or greater capacitor. 17 outl2 ldo2 output. should be closely decoupled to agnd with a 4.7 f or greater capacitor. 18 fbl2 ldo2 feedback input. connect a resistor divider from outl2 to fbl2 to agnd to set the ldo2 output voltage. 19 enl2 ldo2 enable input. active high. 20 ain analog voltage input. ain is the bias supply for the device. should be closely decoupled to agnd with a 2.2 f or greater capacitor. 21 fbb1 dc-dc1 (buck1) feedback input. for externally adjustable versions, connect a resistor divider from buck1 output to fbb1 to agnd to set the buck1 output voltage. 22 enb1 dc-dc1 (buck1) enable input. active high. 23 selb2 dynamically adjusts the output voltage of dc-dc2 (buck2) (logic high=1.3v, logic low=1.0v) 24 lx1 dc-dc1 (buck1) switching node. connect the output inductor to lx1. connected internally to the drains of both high-side and low-side switches. 25 pgnd1 dc-dc1 (buck1) power ground. connected internally to the source of the buck1 n-channel syn- chronous recti er. connect pgnd1 to pgnd2 and agnd as close as possible to the device. 26 inb1 dc-dc1 (buck1) power input. connected internally to the source of the buck1 p-channel switch. should be closely decoupled to pgnd1 with a 4.7 f or greater capacitor. 27 inb2 dc-dc2 (buck2) power input. connected internally to the source of the buck2 p-channel switch. should be closely decoupled to pgnd2 with a 4.7 f or greater capacitor. 28 pgnd2 dc-dc2 (buck2) power ground. connected internally to the source of the buck2 n-channel syn- chronous recti er. connect pgnd2 to pgnd1 and agnd as close as possible to the device. ep exposed paddle (bottom). connect to ground as close as possible to the device.
aat2603 total power solution for portable applications product datasheet 4 2603.2008.10.1.2 www.analogictech.com aat2603 total power solution for portable applications product datasheet 4 2603.2008.10.1.2 www.analogictech.com pin configuration tqfn44-28 (top view) 1 2 3 4 5 6 7 89 ep 10 28 27 26 25 24 23 22 11 12 13 14 21 20 19 18 17 16 15 lx2 enb2 fbb2 enl3 agnd fbl3 outl3 inl34 outl4 fbl4 enl4 byp enl1 fbl1 fbl2 enl2 outl2 inl12 outl1 ain fbb1 selb2 enb1 lx1 pgnd1 inb1 inb2 pgnd2 part number descriptions part number output voltage 1 dc-dc1 (buck1) dc-dc2 (buck2) (selb2 = low) dc-dc2 (buck2) (selb2 = high) ldos 1-4 aat2603inj-1-t1 ext. adj. (v fbb1 = 600mv) ext. adj. (v fbb2 = 600mv) ext. adj. (v fbb2 = 775mv) ext. adj. (v fblx = 1.2v) AAT2603INJ-2-T1 3.3v 1.0v 1.3v ext. adj. (v fblx = 1.2v) aat2603inj-3-t1 ext. adj. (v fbb1 = 600mv) 1.0v 1.3v ext. adj. (v fblx = 1.2v) absolute maximum ratings 1 t a = 25c unless otherwise noted. symbol description value units inbx, inlxx, ain to agnd -0.3 to 6.0 v enbx, enlx, fbbx, fblx, byp to agnd -0.3 to v ain +0.3 v lx1 to pgnd1 -0.3 to v inb1 +0.3 v lx2 to pgnd2 -0.3 to v inb2 +0.3 v pgndx to agnd, pgnd1 to pgnd2 -0.3 to 0.3 v operating temperature range -40 to 150 c storage temperature range -65 to 150 c maximum soldering temperature (at leads, 10 sec) 300 c recommended operating conditions symbol description value units ja thermal resistance 50 c/w p d maximum power dissipation 2 w 1. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at co nditions other than the operating conditions specified is not implied. only one absolute maximum rating should be applied at any one time.
aat2603 total power solution for portable applications product datasheet 2603.2008.10.1.2 5 www.analogictech.com aat2603 total power solution for portable applications product datasheet 2603.2008.10.1.2 5 www.analogictech.com electrical characteristics 1 v ain = v inb1 = v inb2 = v inl12 = v inl34 = 3.6v, c byp = 10nf, t a = -40c to 85c, unless noted otherwise. typical values are at t a = 25c. symbol description conditions min typ max units power supply v in input voltage range 2.7 5.5 v i q quiescent current v enb1 = v enl3 = 3.6v, no load , v fbb1 = v fbl3 = 3.6v 100 200 a i shdn input shutdown current v enx = agnd 1.0 a uvlo under-voltage lockout v in rising 2.6 v v in falling 1.8 v hysteresis 250 mv f osc oscillator frequency 1.5 mhz t s,byp bypass filter startup time v enb1 = 3.6v 200 s dc-dc1 (buck1): 1.2a step-down converter v out_range output voltage range 0.6 v inb1 v v out_acc output voltage accuracy t a = 25c, 20ma load -1.5 +1.5 % t a = -40c to 85c, 20ma load -2.5 +2.5 % v out_tol output voltage tolerance 0a to 1.2a load; v in = 2.7v to 5.5v -3.0 +3.0 % v fbb1_acc feedback voltage accuracy t a = 25c, 20ma load 0.591 0.6 0.609 v t a = -40c to 85c, 20ma load 0.585 0.6 0.615 v v out / i out load regulation 0a to 1.2a load 0.4 % v out / v in line regulation v in = 2.7v to 5.5v 0.2 %/v i shdn shutdown current v enb1 = gnd 1.0 a i lx_leak lx leakage current v inb1 = 5.5v, v lx1 = 0v to v inb1 1.0 a i lim p-channel current limit 1.7 a r ds(on)h high side switch on-resistance 145 m r ds(on)l low side switch on-resistance 200 m t s start-up time enable to output regulation 200 s dc-dc2 (buck2): 600ma step-down converter v out_range output voltage range 0.6 v inb2 v v out_acc output voltage accuracy t a = 25c, 20ma load -1.5 +1.5 % t a = - 40c to 85c, 20ma load -2.5 +2.5 % v out_tol output voltage tolerance 0ma to 600ma load; v in = 2.7v to 5.5v -3.0 +3.0 % v fbb2_acc feedback voltage accuracy selb2 = '0 t a = 25c, 20ma load 0.591 0.6 0.609 v t a = -40c to 85c, 20ma load 0.585 0.6 0.615 feedback voltage accuracy selb2 = '1' t a = 25c, 20ma load 0.763 0.775 0.787 v t a = -40c to 85c, 20ma load 0.756 0.775 0.794 v out / i out load regulation 0ma to 600ma load 0.2 % v out / v in line regulation v in = 2.7v to 5.5v 0.2 %/v i shdn shutdown current v enb2 = gnd 1.0 a i lx_leak lx leakage current v inb2 = 5.5v, v lx2 = 0 to v inb2 1.0 a i lim p-channel current limit 1.3 a r ds(on)h high side switch on-resistance 230 m r ds(on)l low side switch on-resistance 180 m t s start-up time enable to output regulation 200 s 1. the aat2603 is guaranteed to meet performance specification from -40c to +85c and is assured by design, characterization and correlation with statistical process controls.
aat2603 total power solution for portable applications product datasheet 6 2603.2008.10.1.2 www.analogictech.com aat2603 total power solution for portable applications product datasheet 6 2603.2008.10.1.2 www.analogictech.com electrical characteristics 1 v ain = v inb1 = v inb2 = v inl12 = v inl34 = 3.6v, c byp = 10nf, t a = -40c to 85c, unless noted otherwise. typical values are at t a = 25c. symbol description conditions min typ max units 400ma ldo regulators (ldo1, ldo2) v out_range output voltage range 1.5 v inl12 v v fb_acc feedback voltage accuracy t a = 25c, 1ma load 1.182 1.2 1.218 v t a = -40c to 85c, 1ma load 1.17 1.2 1.23 v v fb_tol feedback voltage tolerance 0ma to 400ma load, v in = 2.7v to 5.5v 1.164 1.2 1.236 v v out / i out load regulation 1ma to 400ma load 0.3 % v out / v in line regulation v in = 3.3v to 5.5v, 100ma load 0.08 %/v i out(max) maximum output current 400 ma i lim output current limit 1500 ma v do dropout voltage 400ma load 300 500 mv psrr power supply rejection ratio f < 10khz, c outl1,2 = 4.7 f, 10ma load 50 db t s start-up time v byp already enabled; c out = 4.7 f 200 s 200ma ldo regulators (ldo3, ldo4) v out_range output voltage range 1.2 v inl34 v v fb_acc feedback voltage accuracy t a = 25c, 1ma load 1.182 1.2 1.218 v t a = -40c to +85c, 1ma load 1.17 1.2 1.23 v v fb_tol feedback voltage tolerance 0ma to 200ma load, v in = 2.7v to 5.5v 1.164 1.2 1.236 v v out / i out load regulation 0ma to 200ma load 0.2 % v out / v in line regulation v in = 3.3v to 5.5v, 100ma load 0.02 %/v i out(max) maximum output current 200 ma i lim output current limit 750 ma v do dropout voltage 200ma load 200 350 mv psrr power supply rejection ratio f < 10khz, c outl3,4 = 4.7 f, 10ma load 50 db e n rms output noise power bw: 100~100khz 45 vrms t s start-up time v byp already enabled; c out = 4.7 f 200 s logic inputs/outputs v en(h) input logic high voltage 1.4 v v en(l) input logic low voltage 0.4 v i en logic input current v en = 1.4v 2 1.5 a thermal t sd over-temperature shutdown threshold 140 c t sd(hys) over-temperature shutdown hysteresis 15 c 1. the aat2603 is guaranteed to meet performance specification from -40c to +85c and is assured by design, characterization and correlation with statistical process controls. 2. the enable pins have internal 1.6m pull-down resistors.
aat2603 total power solution for portable applications product datasheet 2603.2008.10.1.2 7 www.analogictech.com aat2603 total power solution for portable applications product datasheet 2603.2008.10.1.2 7 www.analogictech.com typical characteristics?dc-dc1 (buck1) efficiency vs. output current (v outb1 = 3.3v; l = 3.3h) output current (ma) efficiency (%) 0 10 20 30 40 50 60 70 80 90 100 10000 1000 100 10 1 0.1 v in = 5v v in = 4.2v v in = 3.6v load regulation (v outb1 = 3.3v; l = 3.3h) output current (ma) output voltage error (%) -0.4 -0.2 0 0.2 0.4 10000 1000 100 10 1 0.1 v in = 5v v in = 4.2v v in = 3.6v line regulation (v outb1 = 3.3v; l = 3.3h) input voltage (v ) output voltage error (%) -0.4 -0.2 0 0.2 0.4 5.2 4.8 4.4 4 3.6 i out = 1.2a i out = 600ma i out = 300ma i out = 100ma i out = 10ma i out = 1ma i out = 0.1ma output voltage error vs. temperature (v outb1 = 3.3v; v in = 4.2v) temperature (c ) output voltage error (%) -0.4 -0.2 0 0.2 0.4 85 60 35 10 -15 -40 i out = 1.2a i out = 0.1ma p-channel r ds(on) vs. input voltage (v outb1 = 3.3v) input voltage (v ) p-channel r ds(on) (m ) 0 50 100 150 200 250 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 t = 120c t = 100c t = 85c t = 25c load transient (v outb1 = 3.3v; v in = 4.2v; i outb1 = 100ma to 1200ma; c ff = 0pf) time (100s/div) output voltage (ac coupled) (top) output current (bottom) -0.4 -0.2 0 0.2 0.4 0 0.5 1 1.5
aat2603 total power solution for portable applications product datasheet 8 2603.2008.10.1.2 www.analogictech.com aat2603 total power solution for portable applications product datasheet 8 2603.2008.10.1.2 www.analogictech.com typical characteristics?dc-dc1 (buck1) load transient (v outb1 = 3.3v; v in = 4.2v; i outb1 = 100ma to 1200ma; c ff = 100pf) time (100s/div) output voltage (ac coupled) (top) output current (bottom) -0.1 -0.2 0 0.1 0 0.5 1 1.5 load transient (v outb1 = 3.3v; v in = 4.2v; i outb1 = 600ma to 1200ma; c ff = 0pf) time (50s/div) output voltage (ac coupled) (top) output current (bottom) -0.2 -0.1 0 0.1 0.2 0 0.5 1 1.5 load transient (v outb1 = 3.3v; v in = 4.2v; i outb1 = 600ma to 1200ma; c ff = 100pf) time (50s/div) output voltage (ac coupled) (top) output current (bottom) -0.1 -0.2 0 0.1 0 0.5 1 1.5 line transient (v outb1 = 3.3v; v in = 4.2v to 5v; i outb1 = 700ma) time (100s/div) input voltage (top) output voltage (ac coupled) (bottom) 4 5 -0.2 -0.1 0 0.1 soft-start (v outb1 = 3.3v; v in = 4.2v; i outb1 = 1.2a) time (100s/div) enable voltage (top) output voltage (bottom) 0 2 4 6 0 1 2 3 4
aat2603 total power solution for portable applications product datasheet 2603.2008.10.1.2 9 www.analogictech.com aat2603 total power solution for portable applications product datasheet 2603.2008.10.1.2 9 www.analogictech.com typical characteristics?dc-dc2 (buck2) efficiency vs. output current (v outb2 = 1.3v; l = 1.5h) output current (ma) efficiency (%) 0 10 20 30 40 50 60 70 80 90 100 100 1000 10 1 0.1 v in = 5v v in = 4.2v v in = 3.6v v in = 2.7v efficiency vs. output current (v outb2 = 1v; l = 1.2h) output current (ma) efficiency (%) 0 10 20 30 40 50 60 70 80 90 100 1000 100 10 1 0.1 v in = 5v v in = 4.2v v in = 3.6v v in = 2.7v load regulation (v outb2 = 1.3v; l = 1.5h) output current (ma) output voltage error (%) -0.4 -0.2 0 0.2 0.4 1000 100 10 1 0.1 v in = 5v v in = 4.2v v in = 3.6v v in = 2.7v load regulation (v outb2 = 1v; l = 1.2h) output current (ma) output voltage error (%) -0.4 -0.2 0 0.2 0.4 10000 1000 100 10 1 0.1 v in = 5v v in = 4.2v v in = 3.6v v in = 2.7v line regulation (v outb2 = 1.3v; l = 1.5h) input voltage (v ) output voltage error (%) -0.6 -0.4 -0.2 0 0.2 0.4 0.6 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 i out = 600ma i out = 300ma i out = 100ma i out = 10ma i out = 1ma i out = 0.1ma line regulation (v outb2 = 1v; l = 1.2h) input voltage (v ) output voltage error (%) -0.6 -0.4 -0.2 0 0.2 0.4 0.6 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 i out = 600ma i out = 300ma i out = 100ma i out = 10ma i out = 1ma i out = 0.1ma
aat2603 total power solution for portable applications product datasheet 10 2603.2008.10.1.2 www.analogictech.com aat2603 total power solution for portable applications product datasheet 10 2603.2008.10.1.2 www.analogictech.com typical characteristics?dc-dc2 (buck2) output voltage error vs. temperature (v outb2 = 1.3v; v in = 3.6v) temperature (c ) output voltage error (%) -0.6 -0.4 -0.2 0 0.2 0.4 0.6 85 60 35 10 -15 -40 i out = 600ma i out = 0.1ma switching frequency vs. input voltage (v outb2 = 1.3v; i outb2 = 600ma) input voltage (v ) switching frequency (mhz ) 1.46 1.465 1.47 1.475 1.48 1.485 1.49 1.495 1.5 1.505 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 p-channel r ds(on) vs. input voltage (v outb2 = 1.3v) input voltage (v ) p-channel r ds(on) (m ) 0 50 100 150 200 250 300 350 400 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 t = 120c t = 100c t = 85c t = 25c load transient (v outb2 = 1.3v; v in = 3.6v; i outb2 = 100ma to 600ma; c ff = 0pf) time (50s/div) output voltage (ac coupled) (top) output current (bottom) -0.1 -0.05 0 0.05 0.1 0 0.5 1 load transient (v outb2 = 1.3v; v in = 3.6v; i outb2 = 100ma to 600ma; c ff = 100pf) time (50s/div) output voltage (ac coupled) (top) output current (bottom) -0.1 -0.05 0 0.05 0.1 0 0.5 1 load transient (v outb2 = 1.3v; v in = 3.6v; i outb2 = 300ma to 600ma; c ff = 0pf) time (20s/div) output voltage (ac coupled) (top) output current (bottom) -0.05 0 0.05 0 0.5 1
aat2603 total power solution for portable applications product datasheet 2603.2008.10.1.2 11 www.analogictech.com aat2603 total power solution for portable applications product datasheet 2603.2008.10.1.2 11 www.analogictech.com typical characteristics?dc-dc2 (buck2) load transient (v outb2 = 1.3v; v in = 3.6v; i outb2 = 300ma to 600ma; c ff = 100pf) time (20s/div) output voltage (ac coupled) (top) output current (bottom) -0.05 0 0.05 0 0.5 1 line transient (v outb2 = 1.3v; v in = 3.6 to 4.2v; i outb2 = 300ma) time (50s/div) input voltage (top) output voltage (ac coupled) (bottom) -2 -1 0 1 2 3 4 5 6 -0.1 -0.05 0 0.05 0.1 0.15 0.2 0.25 0.3 soft-start (v outb2 = 1.3v; v in = 3.6v; i outb2 = 600ma) time (100s/div) enable voltage (top) output voltage (bottom) 0 2 4 0 0.5 1 1.5
aat2603 total power solution for portable applications product datasheet 12 2603.2008.10.1.2 www.analogictech.com aat2603 total power solution for portable applications product datasheet 12 2603.2008.10.1.2 www.analogictech.com typical characteristics?ldo1/ldo2 load regulation (v outl1&2 = 3v; v in = 3.6v) output current (ma) output voltage error (%) -0.4 -0.2 0 0.2 0.4 1000 100 10 1 0.1 load regulation (v outl1&2 = 1.5v; v in = 3.6v) output current (ma) output voltage error (%) -0.4 -0.2 0 0.2 0.4 1000 100 10 1 0.1 line regulation (v outl1&2 = 1.5) input voltage (v ) output voltage error (%) -0.4 -0.2 0 0.2 0.4 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 i out = 400ma i out = 100ma i out = 10ma i out = 1ma i out = 0.1ma output voltage error vs. temperature (v outl1&2 = 2.8v; v in = 3.6v) temperature (c ) output voltage error (%) -0.4 -0.2 0 0.2 0.4 85 60 35 10 -15 -40 i out = 400ma i out = 0.1ma load transient (v outl1&2 = 2.8v; v in = 3.6v; i outl1&2 = 1ma to 50ma) time (100s/div) output voltage (ac coupled) (top) output current (bottom) -0.04 -0.02 0 0.02 0.04 -0.05 0 0.05 load transient (v outl1&2 = 2.8v; v in = 3.6v; i outl1&2 = 1ma to 200ma) time (100s/div) output voltage (ac coupled) (top) output current (bottom) -0.1 -0.05 0 0.05 0.1 -0.2 0 0.2 0.4
aat2603 total power solution for portable applications product datasheet 2603.2008.10.1.2 13 www.analogictech.com aat2603 total power solution for portable applications product datasheet 2603.2008.10.1.2 13 www.analogictech.com typical characteristics?ldo1/ldo2 load transient (v outl1&2 = 2.8v; v in = 3.6v; i outl1&2 = 1ma to 400ma) time (200s/div) output voltage (ac coupled) (top) output current (bottom) -0.2 -0.1 0 0.1 0.2 0 0.5 line transient (v outl1&2 = 2.8v; v in = 3.6 to 4.2v; i outl1&2 = 400ma) time (20s/div) input voltage (top) output voltage (bottom) 3 4 5 -0.2 -0.1 0 0.1 0.2 soft-start (v outl1&2 = 2.8v; v in = 3.6v; i outl1&2 = 400ma) time (500s/div) enable voltage (top) output voltage (bottom) 0 2 4 0 1 2 3
aat2603 total power solution for portable applications product datasheet 14 2603.2008.10.1.2 www.analogictech.com aat2603 total power solution for portable applications product datasheet 14 2603.2008.10.1.2 www.analogictech.com typical characteristics?ldo3/ldo4 load regulation (v outl3&4 = 3v; v in = 3.6v) output current (ma) output voltage error (%) -0.4 -0.2 0 0.2 0.4 1000 100 10 1 0 load regulation (v outl3&4 = 1.2v; v in = 3.6v) output current (ma) output voltage error (%) -0.4 -0.2 0 0.2 0.4 1000 100 10 1 0.1 line regulation (v outl3&4 = 1.2v) input voltage (v ) output voltage error (%) -0.4 -0.2 0 0.2 0.4 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 i out = 400ma i out = 100ma i out = 10ma i out = 1ma i out = 0.1ma output voltage error vs. temperature (v outl3&4 = 2.8v; v in = 3.6v) temperature (c ) output voltage error (%) -0.4 -0.2 0 0.2 0.4 85 60 35 10 -15 -40 i out = 200ma i out = 0.1ma load transient (v outl3&4 = 2.8v; v in = 3.6v; i outl3&4 = 1ma to 50ma) time (100s/div) output voltage (ac coupled) (top) output current (bottom) -0.02 -0.01 0 0.01 0 0.05 load transient (v outl3&4 = 2.8v; v in = 3.6v; i outl3&4 = 1ma to 100ma) time (100s/div) output voltage ac coupled) (top) output current (bottom) -0.04 -0.02 0 0.02 0 0.1
aat2603 total power solution for portable applications product datasheet 2603.2008.10.1.2 15 www.analogictech.com aat2603 total power solution for portable applications product datasheet 2603.2008.10.1.2 15 www.analogictech.com typical characteristics?ldo3/ldo4 load transient (v outl3&4 = 2.8v; v in = 3.6v; i outl3&4 = 1ma to 200ma) time (100s/div) output voltage (ac coupled) (top) output current (bottom) -0.05 0 0.05 0 0.2 line transient (v outl3&4 = 2.8v; v in = 3.6 to 4.2v; i outl3&4 = 200ma) time (20s/div) input voltage (ac coupled) (top) output voltage (bottom) 3 4 5 -0.1 -0.05 0 0.05 0.1 0.15 soft-start (v outl3&4 = 2.8v; v in = 3.6v; i outl3&4 = 200ma) time (500s/div) enable voltage (top) output voltage (bottom) 0 2 4 6 0 1 2 3
aat2603 total power solution for portable applications product datasheet 16 2603.2008.10.1.2 www.analogictech.com aat2603 total power solution for portable applications product datasheet 16 2603.2008.10.1.2 www.analogictech.com functional block diagram dc-dc1 (buck1) dc-dc2 (buck2) ldo1 ldo2 ldo3 ldo4 interface and support inb 1 fbb 1 lx2 fbb 2 outl 1 outl 2 outl 3 outl 4 fbl 1 fbl 2 fbl 3 fbl 4 inb 2 lx1 enb2 pgnd 2 pgnd 1 agnd byp enl 1 enl 2 enl 3 enl 4 selb 2 enb1 inl34 inl12 ain functional description the aat2603 is a highly integrated voltage regulating power management unit for mobile handsets or other portable devices. it includes two switch-mode step-down converters (600ma [dc-dc2] and 1.2a [dc-dc1]), and four low-dropout (ldo) regulators (two: 200ma, two: 400ma). it operates from an input voltage between 2.7v and 5.5v making it ideal for lithium-ion or 5v regulated power sources. all six converters have separate enable pins for ease of use. step-down converters the aat2603 switch-mode, step-down converters are constant frequency peak current mode pwm converters with internal compensation. the input voltage range is 2.7v to 5.5v. the output voltage range is 0.6v to v in . the high 1.5mhz switching frequency allows the use of small external inductor and capacitor. the step-down converters offer soft-start to limit the current surge seen at the input and eliminate output voltage overshoot. the current across the internal p-channel power switch is sensed and turns off when the current exceeds the current limit. also, thermal protec- tion completely disables switching if internal dissipation becomes excessive, thus protecting the device from damage. the junction over-temperature threshold is 140c with 15c of hysteresis. dc-dc1 (buck1) is designed for a peak continuous out- put current of 1.2a. the high-side power switch has been designed with a low r dson of 145m to allow for a minimum dropout voltage of 174mv at full load current.
aat2603 total power solution for portable applications product datasheet 2603.2008.10.1.2 17 www.analogictech.com it was designed to maintain over 90% efficiency at its maximum rated output current load of 1.2a with a 3.3v output. peak efficiency is above 95%. buck1 has excel- lent transient response, load and line regulation. transient response time is typically less than 20 s. the peak input current is limited to 1.7a. dc-dc2 (buck2) is a 600ma step-down regulator designed to dynamically shift between two output voltages by tog- gling the selb2 pin. the internal reference voltage of the buck regulator is changed based on the position of the selb2 pin. buck2 is designed to maintain over 85% efficiency at its maximum rated output current of 600ma with a 1.2v output. peak efficiency is above 90%. buck2 has excel- lent transient response, load and line regulation. the peak inductor current is limited to 1.3a. the two step-down converters on the aat2603 have highly flexible output voltage programming capability. the output voltages can be factory programmed to pre- set output voltages or set by external resistors. the ?part number descriptions? table lists the available volt- age options for step-down converters buck1 and buck2. option 1 has externally adjustable output voltages for both step-down converters. the dynamic voltage scaling for buck2 is still useable with external feedback resis- tors. when selb2 is in the low position the feedback voltage is compared to a 600mv reference, while when selb2 is high the reference voltage is 775mv. for most other options, the output voltages of buck2 are factory programmed. ldo regulators the aat2603 includes four ldo regulators. the regula- tors operate from the 2.7v to 5.5v input voltage to a regulated output voltage. the ldo regulators have adjustable output voltages set by resistors. each ldo consumes 50ua of quiescent current. the two 200ma ldo regulators are stable with a small 4.7 f ceramic output capacitor. the low 200mv dropout voltage at 200ma load allows a regulated output voltage approaching the input voltage. low output noise voltage and high power supply rejection make these regulators ideal for powering noise sensitive circuitry. the two 400ma ldo regulators are stable with a small 4.7 f ceramic output capacitor. the low 300mv dropout voltage at 400ma load allows a regulated output voltage approaching the input voltage. these ldos offer high power supply rejection. application information dc-dc1/dc-dc2 the step-down converter uses peak current mode con- trol with slope compensation to maintain stability for duty cycles greater than 50%. the output inductor value must be selected so the inductor current down slope meets the internal slope compensation requirements. table 1 displays suggested inductor values for various output voltages. manufacturer?s specifications list both the inductor dc current rating, which is a thermal limitation, and the peak current rating, which is determined by the satura- tion characteristics. the inductor should not show any appreciable saturation under normal load conditions. some inductors may meet the peak and average current ratings yet result in excessive losses due to a high dcr. always consider the losses associated with the dcr and its effect on the total converter efficiency when selecting an inductor. it is recommended that the inductor current rating exceed the current limit of the step-down converter. see table 2 for example inductor values/vendors. input capacitor select a 4.7 f to 10 f x7r or x5r ceramic capacitor for the input; see table 3 for suggested capacitor compo- nents. to estimate the required input capacitor size, determine the acceptable input ripple level (v pp ) and solve for c in (c inb1 /c inb2 ). the calculated value varies with input voltage and is a maximum when v in is double the output voltage. 1 - v o v in c in = v o v in - esr f s v pp i o 1 - = for v in = 2 v o v o v in v o v in 1 4 c in(min) = 1 - esr 4 f s v pp i o always examine the ceramic capacitor dc voltage coef- ficient characteristics when selecting the proper value. for example, the capacitance of a 10 f, 6.3v, x5r ceram- ic capacitor with 5.0v dc applied is actually about 6 f.
aat2603 total power solution for portable applications product datasheet 18 2603.2008.10.1.2 www.analogictech.com con guration output voltage inductor value adjustable and fixed output voltage 1v, 1.2v, 1.3v 1.0 h to 1.2 h 1.5v, 1.8v 1.5 h to 1.8 h 2.5v 2.2 h to 2.7 h 2.8v, 3.3v 3.3 h table 2: inductor values for specific output voltages. the maximum input capacitor rms current is: i rms = i o 1 - v o v in v o v in the input capacitor rms ripple current varies with the input and output voltage and will always be less than or equal to half of the total dc load current. 1 - = d (1 - d) = 0.5 2 = v o v in v o v in 1 2 for v in = 2 v o . manufacturer part number/ type inductance ( h) rated current (a) dcr (m ) (max) size (mm) lxwxh tdk ltf5022 1.2 4.3 25 5x5.2x2.2 1.8 3.6 32 2.2 3.2 40 3.3 2.5 60 wurth electronik we-tpc type m 1 2.6 30 4.8x4.8x1.8 1.8 2.35 50 2.7 2.03 60 3.3 1.8 65 we-tpc type mh 1.2 2.8 20 4.8x4.8x2.8 1.8 2.45 25 2.2 2.35 28 2.7 1.95 30 3.3 1.8 35 murata lqh55d 1 4 19 (typ) 5x5.7x4.7 1.5 3.7 22 (typ) 2.2 3.2 29 (typ) 3.3 2.9 36 (typ) table 1: suggested inductor components. manufacturer part number value voltage temp. co. case avx 0603zd105k 1 f10 x5r 0603 0603zd225k 2.2 f10 tdk c1608x5r1e105k 1 f25 x5r 0603 c1608x5r1c225k 2.2 f16 c1608x5r1a475k 4.7 f10 c2012x5r1a106k 10 f 10 0805 c3216x5r1a226k 22 f 10 1206 murata grm188r61c105k 1 f16 x5r 0603 grm188r61a225k 2.2 f10 grm219r61a106k 10 f 10 0805 grm31cr71a226k 22 f 10 x7r 1206 taiyo yuden lmk107bj475ka 4.7 f 10 x5r 0603 table 3: suggested capacitor components.
aat2603 total power solution for portable applications product datasheet 2603.2008.10.1.2 19 www.analogictech.com i o rms(max) i 2 = the term 1 - v o v in v o v in appears in both the input voltage rip- ple and input capacitor rms current equations and is a maximum when v o is twice v in . this is why the input voltage ripple and the input capacitor rms current ripple are a maximum at 50% duty cycle. the input capacitor provides a low impedance loop for the edges of pulsed current drawn by the aat2603 step- down switching regulators. low esr/esl x7r and x5r ceramic capacitors are ideal for this function. to mini- mize stray inductance, the capacitor should be placed as closely as possible to the ic. this keeps the high fre- quency content of the input current localized, minimizing emi and input voltage ripple. a laboratory test set-up typically consists of two long wires running from the bench power supply to the eval- uation board input voltage pins. the inductance of these wires, along with the low-esr ceramic input capacitor, can create a high q network that may affect converter performance. this problem often becomes apparent in the form of excessive ringing in the output voltage dur- ing load transients. errors in the loop phase and gain measurements can also result. since the inductance of a short pcb trace feeding the input voltage is significantly lower than the power leads from the bench power supply, most applications do not exhibit this problem. in applications where the input power source lead induc- tance cannot be reduced to a level that does not affect the converter performance, a high esr tantalum or alu- minum electrolytic should be placed in parallel with the low esr, esl bypass ceramic. this dampens the high q network and stabilizes the system. output capacitor the output capacitor limits the output ripple and provides holdup during large load transitions. a 10 f to 22 f x5r or x7r ceramic capacitor typically provides sufficient bulk capacitance to stabilize the output during large load tran- sitions and has the esr and esl characteristics neces- sary for low output ripple. a 10 f x5r or x7r ceramic capacitor is required for dc-dc2 and a 22 f x5r or x7r ceramic capacitor is required for dc-dc1; see table 3 for suggested capacitor components. the output voltage droop due to a load transient is dom- inated by the capacitance of the ceramic output capacitor. during a step increase in load current, the ceramic output capacitor alone supplies the load current until the loop responds. within several switching cycles, the loop responds and the inductor current increases to match the load current demand. the relationship of the output volt- age droop during the several switching cycles to the out- put capacitance can be estimated by: c out = 3 i load v droop f s once the average inductor current increases to the dc load level, the output voltage recovers. the above equa- tion establishes a limit on the minimum value for the output capacitor with respect to load transients. the internal voltage loop compensation also limits the minimum output capacitor value to 10 f for dc-dc2 and 22 f for dc-dc1. this is due to its effect on the loop crossover frequency (bandwidth), phase margin, and gain margin. increased output capacitance will reduce the crossover frequency with greater phase margin. the maximum output capacitor rms ripple current is given by: 1 23 v out (v in(max) - v out ) rms(max) i l f s v in(max) = dissipation due to the rms current in the ceramic output capacitor esr is typically minimal, resulting in less than a few degrees rise in hot-spot temperature. feedback resistor selection resistors r1 and r2 of figure 1 program the output to regulate at a voltage higher than 0.6v. to limit the bias current required for the external feedback resistor string while maintaining good noise immunity, the minimum suggested value for r2 is 59k . although a larger value will further reduce quiescent current, it will also increase the impedance of the feedback node, making it more sensitive to external noise and interference. table 42 summarizes the resistor values for various output volt- ages with r2 set to either 59k for good noise immu- nity or 221k for reduced no load input current.
aat2603 total power solution for portable applications product datasheet 20 2603.2008.10.1.2 www.analogictech.com r1 = -1 r2 = - 1 59k = 88.5k v out v ref 1.5v 0.6v the aat2603 step-down regulators, combined with an external feedforward capacitor (c ff in figure 1), deliver enhanced transient response for extreme pulsed load applications. v fbb1 /v fbb2 v dc-dc1 /v dc-dc2 r1 r2 c ff figure 1: aat2603 dc-dc1/dc-dc2 external resistor output voltage programming. v out (v) r2 = 59k r1 (k ) r2 = 221k r1 (k ) 0.9 29.4 113k 1.0 39.2 150k 1.1 49.9 187k 1.2 59.0 221k 1.3 68.1 261k 1.4 78.7 301k 1.5 88.7 332k 1.8 118 442k 1.85 124 464k 2.0 137 523k 2.5 187 715k 3.3 267 1.00m table 4: feedback resistors for dc-dc1 and dc-dc2. ldo1/ldo2/ldo3/ldo4 input capacitor typically, a 2.2 f or larger capacitor is recommended for c inl12 /c inl34 /c ain in most applications. the input capacitor should be located as close to the input (inl12/inl34/ ain) of the device as practically possible. c inl12 /c inl34 / c ain values greater than 2.2 f will offer superior input line transient response and will assist in maximizing the highest possible power supply ripple rejection. ceramic, tantalum, or aluminum electrolytic capacitors may be selected for c inl12 /c inl34 /c ain . there is no specific capacitor esr requirement for c inl12 /c inl34 /c ain . however, for 200ma/400ma ldo regulators output operation, ceramic capacitors are recommended for c inl12 /c inl34 /c ain due to their inherent capability over tantalum capacitors to withstand input current surges from low impedance sources such as batteries in portable devices. output capacitor for proper load voltage regulation and operational stabil- ity, a capacitor is required between pins voutlx and agnd. the c outlx capacitor connection to the ldo regu- lator ground pin should be made as direct as practically possible for maximum device performance. the aat2603 ldo regulators have been specifically designed to function with very low esr ceramic capaci- tors. although the device is intended to operate with these low esr capacitors, it is stable over a very wide range of capacitor esr, thus it will also work with higher esr tantalum or aluminum electrolytic capacitors. however, for best performance, ceramic capacitors are recommended. typical output capacitor values for maximum output cur- rent conditions range from 4.7 f to 10 f. if desired, c outlx may be increased without limit. bypass capacitor and low noise applications a bypass capacitor pin is provided to enhance the very low noise characteristics of the aat2603 ldo3 and ldo4 regulators. the bypass capacitor is not necessary for operation of the aat2603. however, for best device per- formance, a small ceramic capacitor should be placed between the bypass pin (byp) and the device analog ground pin (agnd). the value of c byp should be 10nf. for lowest noise and best possible power supply ripple rejec- tion performance a 10nf capacitor should be used. to practically realize the highest power supply ripple rejec- tion and lowest output noise performance, it is critical that the capacitor connection between the byp pin and agnd pin be direct and pcb traces should be as short as possible. refer to the pcb layout recommendations sec- tion of this datasheet for examples.
aat2603 total power solution for portable applications product datasheet 2603.2008.10.1.2 21 www.analogictech.com there is a relationship between the bypass capacitor value and the ldo regulator turn-on time. in applica- tions where fast device turn-on time is desired, the value of c byp should be reduced. in applications where low noise performance and/or ripple rejection are less of a concern, the bypass capac- itor may be omitted. the fastest device turn-on time will be realized when no bypass capacitor is used. dc leakage on this pin can affect the ldo regulator output noise and voltage regulation performance. for this reason, the use of a low leakage, high quality ceramic (npo or c0g type) or film capacitor is highly recommended. feedback resistor selection resistors r1 and r2 of figure 2 program the output to regulate at a voltage higher than 1.5v for ldo1/ldo2 and 1.2v for ldo3/ldo4. to limit the bias current required for the external feedback resistor string while maintaining good noise immunity, the minimum sug- gested value for r2 is 100k . although a larger value will further reduce quiescent current, it will also increase the impedance of the feedback node, making it more sensitive to external noise and interference. tables 5 and 6 summarize the resistor values for various output voltages with r2 set to 100k . r1 = -1 r2 = - 1 100k = 24.9k v out v ref 1.5v 1.2v v fblx v outlx r1 r2 figure 2: aat2603 ldo1/ldo2/ldo3/ldo4 external resistor output voltage programming. v out (v) r2 = 100k r1 (k ) 1.3 8.25 1.4 16.5 1.5 24.9 1.6 33.2 1.7 41.2 1.8 49.9 1.9 59 2 66.5 2.1 75 2.2 82.5 2.3 90.9 2.4 100 2.5 107 2.6 118 2.7 124 2.8 133 2.9 140 3 150 3.1 158 3.2 165 3.3 174 table 5: feedback resistor values for ldo3 and ldo4. v out (v) r2 = 100k r1 (k ) 1.5 24.9 1.6 33.2 1.7 41.2 1.8 49.9 1.9 59 2 66.5 2.1 75 2.2 82.5 2.3 90.9 2.4 100 2.5 107 2.6 118 2.7 124 2.8 133 2.9 140 3 150 3.1 158 3.2 165 3.3 174 table 6: feedback resistor values for ldo1 and ldo2.
aat2603 total power solution for portable applications product datasheet 22 2603.2008.10.1.2 www.analogictech.com thermal calculations there are three types of losses associated with the aat2603 total power management solution [two step- down and four ldo regulators]: switching losses, con- duction losses, and quiescent current losses. conduction losses are associated with the r ds(on) characteristics of the internal power switches/fets of both of the step- down regulators and the power loss associated with the voltage difference across the pass switch/fet of the four ldo regulators. switching losses are dominated by the gate charge of the power output switching devices. at full load, assuming continuous conduction mode (ccm), a simplified form of the losses is given by the following (quiescent and switching losses are ignored, since con- duction losses are so dominant): p dc-dc1 i o1 2 (r ds(on)h1 v ob1 + r ds(on)l1 [v inb1 - v ob1 ]) v inb1 = p dc-dc2 i o2 2 (r ds(on)h2 v ob2 + r ds(on)l2 [v inb2 - v ob2 ]) v inb2 = p ldo1 = i ldo1 (v inl12 - v ol1 ) p ldo2 = i ldo2 (v inl12 - v ol2 ) p ldo3 = i ldo3 (v inl34 - v ol3 ) p ldo4 = i ldo4 (v inl34 - v ol4 ) p total = p dc_dc1 + p dc_dc2 + p ldo1 + p ldo2 + p ldo3 + p ldo4 p dc-dcx : power dissipation of the specific dc-dc regulator i ox : output current of the specific dc-dc regulator r ds(on)hx : resistance of the internal high-side switch/fet r ds(on)lx : resistance of the internal low-side switch/fet v obx : output voltage of the specific dc-dc regulator v inbx : input voltage of the specific dc-dc regulator p ldox : power dissipation of the specific ldo regulator i ldox : output current of the specific ldo regulator v inlxx : input voltage of the specific ldo regulator v olx : output voltage of the specific ldo regulator p total : total power dissipation of the aat2603 since r ds(on) and conduction losses all vary with input voltage, the dominant losses should be investigated over the complete input voltage range. given the total con- duction losses, the maximum junction temperature (125c) can be derived from the ja for the tqfn44-28 package which is 50c/w. t j(max) = p total ja + t a t j(max) : maximum junction temperature p total : total conduction losses ja : thermal impedance of the package t a : ambient temperature layout the suggested pcb layout for the aat2603 is shown in figures 4 and 5. the following guidelines should be used to help ensure a proper layout. 1. the input capacitors (c1, c2, c7, c13, and c16) should connect as closely as possible to inb1 (pin 26), inb2 (pin 27), ain (pin 20), inl12 (pin 16), inl34 (pin 8), and agnd/pgnd1/pgnd2 (pins 5, 25, and 27). 2. c3/c18 (step-down regulator output capacitors) and l1/l2 should be connected as closely as possible. the connection of l1/l2 to the lx1/lx2 pins should be as short as possible. 3. the feedback trace or fbxx pin (pins 3, 6, 10, 14, 18, and 21) should be separate from any power trace and connect as closely as possible to the load point. sensing along a high current load trace will degrade dc load regulation. if external feedback resistors are used, they should be placed as closely as possible to the fbxx pin (pins 3, 6, 10, 14, 18, and 21) to minimize the length of the high imped- ance feedback trace. 4. the resistance of the trace from the load return to the pgnd1/pgnd2 (pins 25 and 28) 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. 5. for good thermal coupling, pcb vias are required from the pad for the tdfn44-28 exposed paddle to the ground plane.
aat2603 total power solution for portable applications product datasheet 2603.2008.10.1.2 23 www.analogictech.com aat2603 total power solution for portable applications product datasheet 2603.2008.10.1.2 23 www.analogictech.com lx2 1 enb2 2 fbb2 3 enl3 4 agnd 5 fbl3 6 outl3 7 inl34 8 outl4 9 fbl 4 10 enl4 11 byp 12 enl1 13 fbl1 14 outl1 15 inl12 16 outl2 17 fbl2 18 enl2 19 ain 20 fbb1 21 enb1 22 sel b2 23 lx1 24 pgnd1 25 inb1 26 inb2 27 pgnd2 28 aat2603 u1 c1 r1 c13 c17 c7 c5 c3 c18 c4 c8 r11 r9 r2 r12 r10 r8 r5 r6 r7 r4 r3 l2 l1 c11 c15 c16 c14 c10 c12 c9 c6 gnd gnd enb2 enl1 enl3 vin selb2 gnd vin vin enl2 enb1 enl4 vin outb1 outb2 outl1 outl2 outl3 outl4 c2 1 3 2 3-prong header 3-prong header j1 3-prong header j3 1 3 2 j2 3-prong header j4 3-prong header j5 3-prong header j7 3-prong header j6 1 3 2 1 3 2 1 3 2 1 3 2 vin gnd enl1 enb1 enl2 enb 2 enl3 enl4 1 3 2 selb2 figure 3: aat2603 evaluation board schematic.
aat2603 total power solution for portable applications product datasheet 24 2603.2008.10.1.2 www.analogictech.com figure 4: aat2603 evaluation board top side pcb layout. figure 5: aat2603 evaluation board bottom side pcb layout.
aat2603 total power solution for portable applications product datasheet 2603.2008.10.1.2 25 www.analogictech.com aat2603 total power solution for portable applications product datasheet 2603.2008.10.1.2 25 www.analogictech.com ordering information package output voltage 1 marking 2 part number (tape and reel) 3 dc-dc1 (buck1) dc-dc2 (buck2) (selb2 = low) dc-dc2 (buck2) (selb2 = high) tqfn44-28 ext. adj. (v ref = 600mv) ext. adj. (vv ref = 600mv) ext. adj. (vv ref = 775mv) 3axyy aat2603inj-1-t1 tqfn44-28 3.3v 1.0v 1.3v AAT2603INJ-2-T1 tqfn44-28 ext. adj. (v ref = 600mv) 1.0v 1.3v aat2603inj-3-t1 all analogictech products are offered in pb-free packaging. the term ?pb-free? means semiconductor products that are in compliance with current rohs standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. for more information, please visit our website at http://www.analogictech.com/about/quality.aspx. 1. buck 1 and buck 2 output voltages can be factory programmed to most common output voltages. contact your local sales represe ntative for availability and minimum order quantities. 2. xyy = assembly and date code. 3. sample stock is generally held on part numbers listed in bold .
aat2603 total power solution for portable applications product datasheet 26 2603.2008.10.1.2 www.analogictech.com aat2603 total power solution for portable applications product datasheet 26 2603.2008.10.1.2 www.analogictech.com advanced analogic technologies, inc. 3230 scott boulevard, santa clara, ca 95054 phone (408) 737-4600 fax (408) 737-4611 ? advanced analogic technologies, inc. analogictech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an analogictech pr oduct. no circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. analogictech reserves the right to make changes to their products or speci cations or to discontinue any product or service without notice. except as provided in analogictech?s terms and conditions of sale, analogictech assumes no liability whatsoever, and analogictech disclaims any express or implied warranty re lating to the sale and/or use of analogictech products including liability or warranties relating to tness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right . in order to minimize risks associated with the customer?s applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. testing and other quality control techniques are utilized to the extent analogictech deems necessary to support this warranty. speci c testing of all parameters of each device is not necessarily performed. analogictech and the analogictech logo are trademarks of advanced analogic technologies incorporated. all other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders. package information tqfn44-28 4.000 0.050 2.600 0.050 bottom view detail "a" 0.750 0.050 0.050 0.050 0.203 ref side view 0.400 0.050 0.230 1. 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 connection.

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