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general description the max8581/max8582 high-frequency step-down con- verters are optimized for dynamically powering the power amplifier (pa) in cdma handsets. they integrate a high- efficiency pwm step-down converter for medium- and low-power transmission and a 60m ? (typ) bypass mode to power the pa directly from the battery during high- power transmission. they use an analog input driven by an external dac to control the output voltage linearly for continuous pa power adjustment. the max8581/ max8582 use an internal feedback network, and the switching frequency is internally set to 2.5mhz and 1.5mhz, respectively. fast switching (up to 2.5mhz) and fast soft-start allow the use of ceramic 2.2? input and output capacitors while maintaining low voltage ripple. the small 1.5? to 3.3? inductor size can be optimized for efficiency. the max8581/max8582 are available in 10-pin, 3mm x 3mm tdfn packages (0.8mm max height). applications wcdma/ncdma cell phones wireless pdas, smartphones features ? 600ma step-down converter ? 60m ? (typ) bypass mode with integrated fet ? dynamically adjustable output from 0.4v to v in ? 2.5mhz and 1.5mhz switching frequency ? small lc components: 1.5h to 3.3h and 2.2f ? up to 94% efficiency ? low output ripple at all loads ? 2.7v to 5.5v input ? 0.1a shutdown mode ? output short-circuit protection ? thermal shutdown ? 10-pin, 3mm x 3mm tdfn packag es max8581/max8582 2.5mhz/1.5mhz step-down converters with 60m ? bypass in tdfn for cdma pa power ________________________________________________________________ maxim integrated products 1 top view out ic in 1 2 lx out in shdn gnd 3 4 max8581/ max8582 10 98 7 refin 6 hp 5 + pin configuration ordering information input li+ battery 2.2 f in gnd shdn refin out lx hp forced bypass output 0.4v to v batt 1.5 h or 3.3 h 2.2 f on/off analog control max8581 max8582 t ypical operating circuit 19-0593; rev 1; 1/07 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. * all devices are specified in the -40? to +85? extended temperature range. ** ep = exposed pad. + denotes a lead-free package. evaluation kit available part* pin- package top mark pkg code max8581 etb+ 10 tdfn-ep** act t1033-1 max8582 etb+ 10 tdfn-ep** acu t1033-1
max8581/max8582 2.5mhz/1.5mhz step-down converters with 60m ? bypass in tdfn for cdma pa power 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v in = v shdn = 3.6v, v refin = 0.9v, v hp = v ic = 0v, t a = -40? to +85?, typical values are at t a = +25?, unless otherwise noted.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. in, shdn , hp, refin to gnd ...............................-0.3v to +6.0v lx, out, ic to gnd.....................................-0.3v to (v in + 0.3v) out short circuit to gnd ..........................................continuous lx current ......................................................................0.7a rms in, out current..............................................................2.5a rms continuous power dissipation (t a = +70?) 10-pin tdfn (derate 24.4mw/ c above +70?).........1951mw operating temperature range ...........................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units supply supply voltage range v in 2.7 5.5 v uvlo threshold uvlo v in rising, 180mv hysteresis 2.55 2.63 2.70 v i load = 0a, switching at 1.5mhz 4000 shutdown, t a = +25 c 0.1 10 supply current i in shutdown, t a = +85 c 1.0 ? out v in = 4.2v, v refin = 1.7v 3.33 3.40 3.47 v refin = 0.9v 1.75 1.80 1.85 out voltage accuracy v out v in = 3.6v v refin = 0.4v 0.75 0.80 0.85 v max8581 360 out input resistance r out v lx = v out max8582 558 k ? refin refin common-mode range 0 2.2 v refin to out gain 2.00 v/v refin input resistance 518 k ? refin dual mode ? threshold v refin rising, 77mv hysteresis 0.45 x v in 0.463 x v in 0.475 x v in v logic inputs v ih v in = 2.7v to 5.5v 1.4 logic input level v il v in = 2.7v to 5.5v 0.4 v t a = +25 c 0.01 1 logic input bias current i ih , i il v input = 0v or v in t a = +85 c 0.1 ? dual mode is a trademark of maxim integrated products, inc.
max8581/max8582 2.5mhz/1.5mhz step-down converters with 60m ? bypass in tdfn for cdma pa power _______________________________________________________________________________________ 3 note 1: all devices are 100% production tested at t a = +25?. limits over the operating temperature range are guaranteed by design. electrical characteristics (continued) (v in = v shdn = 3.6v, v refin = 0.9, v hp = v ic = 0v, t a = -40? to +85?, typical values are at t a = +25?, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units lx r onp p-channel mosfet switch, i lx = -40ma 0.2 0.4 on-resistance r onn n-channel mosfet rectifier, i lx = 40ma 0.18 0.35 ? t a = +25 c 0.1 5 lx leakage current i lxlkg v in = 5.5v, lx = gnd t a = +85 c1 ? p-channel mosfet peak current limit i limp 700 1077 1400 ma n-channel mosfet valley current limit i limn 790 985 1150 ma t on(min) 70 114 150 minimum on- and off-times t off(min) 70 112 150 ns t on /t off ratio t on(min) / t off(min) 0.90 1.02 1.13 s/s max8581 2.5 switching frequency max8582 1.5 mhz bypass p-channel mosfet bypass, i out = -400ma, t a = +25 c 0.06 0.1 on-resistance r onbyp p-channel mosfet bypass, i out = -400ma 0.12 ? bypass current limit 1.0 2.1 a step-down current limit in bypass 700 1077 1400 ma general thermal shutdown +160 c thermal-shutdown hysteresis 20 c power-up delay v shdn rising to v lx rising 50 130 ?
max8581/max8582 2.5mhz/1.5mhz step-down converters with 60m ? bypass in tdfn for cdma pa power 4 _______________________________________________________________________________________ t ypical operating characteristics (v in = 3.6v, v out = 1.2v, max8582 ev kit, t a = +25?, unless otherwise noted.) bypass mode dropout voltage vs. load current max8581/2 toc01 load current (a) dropout voltage (v in - v out ) (v) 0.8 0.6 0.2 0.4 0.01 0.02 0.03 0.04 0.06 0.05 0.07 0.08 0 0 1.0 v out = 3.2v v out = 3.6v efficiency vs. output voltage max8581/2 toc02 output voltage (v) efficiency (%) 2.8 2.4 2.0 1.2 1.6 65 70 75 80 90 85 95 100 60 0.8 3.2 r load = 7.5 ? efficiency vs. load current (v out = 1.8v) max8581/2 toc03 load current (ma) efficiency (%) 100 20 10 30 40 50 60 80 70 90 100 0 10 1000 efficiency vs. load current (v out = 1.2v) max8581/2 toc04 load current (ma) efficiency (%) 100 20 10 30 40 50 60 80 70 90 100 0 10 1000 efficiency vs. load current (v out = 0.6v) max8581/2 toc05 load current (ma) efficiency (%) 100 20 10 30 40 50 60 80 70 90 0 10 1000 no-load supply current vs. supply voltage max8581/2 toc06 supply voltage (v) supply current (ma) 4.0 4.5 5.0 2 1 3 4 5 6 8 7 9 0 2.5 3.0 3.5 5.5 output voltage vs. load current max8581/2 toc07 load current (ma) output voltage (v) 300 400 500 1.160 1.170 1.180 1.190 1.200 1.210 1.150 0100 200 600 output voltage vs. refin voltage max8581/2 toc08 refin voltage (v) output voltage v out (v) 1.2 0.9 1.5 1.8 0.5 1.5 1.0 2.0 3.0 2.5 4.0 3.5 4.5 0 00.3 0.6 2.1 v in = 4.2v v in = 3.6v v in = 3.0v r load = 7.5 ?
max8581/max8582 2.5mhz/1.5mhz step-down converters with 60m ? bypass in tdfn for cdma pa power _______________________________________________________________________________________ 5 t ypical operating characteristics (continued) (v in = 3.6v, v out = 1.2v, max8582 ev kit, t a = +25?, unless otherwise noted.) light-load switching waveforms max8581/2 toc09 200ns/div i lx v lx v out 100ma/div 20mv/div ac-coupled 2v/div 0a 0v i load = 50ma heavy-load switching waveforms max8581/2 toc10 200ns/div i lx v lx v out 600ma 400ma 200ma 20mv/div ac-coupled 2v/div 0v i load = 500ma soft-start waveforms max8581/2 toc11 20 s/div i lx i in v out 2v 2v/div 1v/div 0v 100ma/div 0a 500ma/div 0a v shdn line-transient waveforms max8581/2 toc12 20 s/div i lx v in v out 4v 3v 50mv/div ac-coupled 200ma/div 0a r load = 7.5 ? load transient max8581/2 toc13 20 s/div v out i out 50mv/div ac-coupled 100ma/div 0a refin transient response max8581/2 toc14 20 s/div i lx v refin v out 2v 1v 1v 0.5v 200ma/div 0a r load = 7.5 ? refin transient with autobypass max8581/2 toc15 20 s/div i lx v refin v out i out 2v/div 0v 1v/div 0v 500ma/div 0a 500ma/div 0a r load = 7.5 ? hp transient response with forced autobypass max8581/2 toc16 20 s/div i lx v hp v out i out 2v/div 0v 1v/div 0v 500ma/div 0a 500ma/div 0a r load = 7.5 ? v refin = 0.6v
max8581/max8582 2.5mhz/1.5mhz step-down converters with 60m ? bypass in tdfn for cdma pa power 6 _______________________________________________________________________________________ detailed description the max8581/max8582 step-down converters deliver over 600ma to dynamically power the pa in cdma handsets. the hysteretic pwm control scheme switches with nearly fixed frequency at 1.5mhz (max8582) to 2.5mhz (max8581), allowing efficiency and tiny external components. a 60m ? bypass mode connects the pa directly to the battery during high-power transmission. control scheme a hysteretic pwm control scheme ensures high effi- ciency, fast switching, fast transient response, low out- put ripple, and physically tiny external components. this control scheme is simple: when the output voltage is below the regulation voltage, the error comparator begins a switching cycle by turning on the high-side switch. this switch remains on until the minimum on- time expires and the output voltage is in regulation or the current-limit threshold is exceeded. once off, the high-side switch remains off until the minimum off-time expires and the output voltage falls out of regulation. during this period, the low-side synchronous rectifier turns on and remains on until the high-side switch turns on again. the internal synchronous rectifier eliminates the need for an external schottky diode. voltage-positioning load regulation the max8581/max8582 utilize a unique feedback net- work. by taking feedback from the lx node, the usual phase lag due to the output capacitor is removed, mak- ing the loop exceedingly stable and allowing the use of very small ceramic output capacitors. this configura- tion yields load regulation equal to half the inductor? series resistance multiplied by the load current. this voltage-positioning load regulation greatly reduces overshoot during load transients or when changing v out from one voltage to another. however, when cal- culating refin voltage, the load regulation should be considered. because inductor resistance is typically well specified and the typical pa is a resistive load, the v refin to v out gain is slightly less than 2v/v for the max8581/max8582. bypass mode during high-power transmission, the bypass mode? low on-resistance provides low dropout, long battery life, and high output-current capability. bypass mode connects in directly to out with the internal 60m ? (typ) bypass fet, while the step-down converter is forced into 100% duty-cycle operation to slightly lower total on-resistance to less than 60m ? (typ). pin description pin name function 1 gnd ground 2, 3 in supply voltage input. 2.7v to 5.5v. bypass with a 2.2? ceramic capacitor as close as possible to in and gnd. 4 shdn active-low shutdown input. connect to in or logic-high for normal operation. connect to gnd or logic-low for shutdown mode. 5hp high-power mode set input. drive hp high to invoke bypass mode. bypass mode connects in directly to out with the internal bypass mosfet. 6 refin dac-controlled input. output regulates to 2 x v refin for the max8581 and max8582. dual-mode threshold at 0.465 v in enables bypass mode. 7i ci nternally connected. connect to ground. 8, 9 out output voltage connection for bypass mode. internally connected to in using the internal bypass mosfet during bypass mode. connects to the internal feedback network. 10 lx inductor connection. connect inductor to the drains of the internal p-channel and n-channel mosfets. connects to the internal feedback network. ? p exposed paddle. connect to gnd.
forced and automatic bypass mode invoke forced-bypass mode by driving hp high or invoke automatic bypass by applying a high voltage to refin (v refin > 2.1v with a li-ion (li+) battery at in). to prevent excessive output ripple as the step-down converter approaches dropout, the max8581/max8582 preemptively enter bypass mode automatically when v refin > 0.465 v in (see figure 1). shutdown mode connect shdn to gnd or logic-low to place the max8581/max8582 in shutdown mode and reduce supply current to 0.1?. in shutdown, the control cir- cuitry, internal switching mosfet, and synchronous rectifier turn off and lx becomes high impedance. connect shdn to in or logic-high for normal operation. fast soft-start the max8581/max8582 have internal fast soft-start cir- cuitry that limits inrush current at startup, reducing tran- sients on the input source. soft-start is particularly useful for supplies with high output impedance such as li+ and alkaline cells. see the soft-start waveforms in the typical operating characteristics. analog refin control the max8581/max8582 use refin to set the output voltage and to switch to bypass mode. the output volt- age is two times the voltage applied at refin minus half the ir voltage drop caused by the inductor? dc resistance for the max8581/max8582. this allows the converter to operate in applications where dynamic voltage control is required. applications information the max8581/max8582 are optimized for use with a tiny inductor and small ceramic capacitors. the correct selection of external components ensures high efficiency, low output ripple, and fast transient response. setting the output voltage the max8581/max8582 output voltages are set by the voltage applied to refin. the output voltage is 2 v refin minus half the ir voltage drop caused by the inductor? dc resistance for the max8581/max8582. inductor selection the max8581/max8582 use 1.5? and 3.3?, respec- tively. low inductance values are physically smaller but require faster switching, which results in some effi- ciency loss (see the typical operating characteristics for efficiency). the inductor? dc current rating only needs to match the maximum load of the application because the max8581/max8582 feature zero current overshoot during startup and load transients. for optimum transient response and high efficiency, choose an inductor with dc series resistance in the 50m ? to 150m ? range. output capacitor selection the output capacitor is required to keep the output volt- age ripple small and to ensure regulation loop stability. the output capacitor must have low impedance at the switching frequency. ceramic capacitors with x5r or x7r dielectric are highly recommended due to their small size, low esr, and small temperature coefficients. due to the unique feedback network, the output capa- citance can be very low. in most applications, 2.2? works well. for optimum load-transient performance and very low output ripple, the output capacitor value can be increased. input capacitor selection the input capacitor reduces the current peaks drawn from the battery or input power source and reduces switching noise in the max8581/max8582. the imped- ance of the input capacitor at the switching frequency should be kept very low. ceramic capacitors with x5r or x7r dielectric are highly recommended due to their small size, low esr, and small temperature coefficients. due to the max8581/max8582s?fast soft-start, the input capacitance can be very low. in most applications, 2.2? works well. for optimum noise immunity and low input ripple, the input capacitor value can be increased. max8581/max8582 2.5mhz/1.5mhz step-down converters with 60m ? bypass in tdfn for cdma pa power _______________________________________________________________________________________ 7 v in = 3.2v to 3.66v 200mv/div v out = 3v 200mv/div 5ms/div figure 1. v in and v out with automatic entry/exit into bypass mode
max8581/max8582 pcb layout checklist high switching frequencies and relatively large peak cur- rents make the pcb layout a very important part of design. good design minimizes excessive emi on the feedback paths and voltage gradients in the ground plane, both of which can result in instability or regulation errors. connect the input capacitor close to in and gnd. connect the inductor and output capacitor as close to the ic as possible and keep their traces short, direct, and wide. keep noisy traces, such as the lx node, as short as possible. connect gnd to the exposed paddle directly under the ic. figure 2 illustrates an example pcb layout and routing scheme. chip information process: bicmos 2.5mhz/1.5mhz step-down converters with 60m ? bypass in tdfn for cdma pa power 8 _______________________________________________________________________________________ table 1. suggested inductors manufacturer series inductance (h) esr ( ? ) current rating (ma) dimensions 1.5 0.10 1400 coilcraft lp03310 3.3 0.16 950 3.3 x 3.3 x 1.0 = 11mm 3 sd3110 1.5 0.11 970 3.1 x 3.1 x 1.05 = 10mm 3 1.5 0.10 1090 cooper sd3112 3.3 0.17 840 3.1 x 3.1 x 1.2 = 12mm 3 1.5 0.07 1500 fdk mipf2520d 3.3 0.10 1200 2.5 x 2.0 x 1.0 = 5mm 3 panasonic elc3fn 2.2 0.12 1000 3.2 x 3.2 x 1.2 = 12mm 3 cdrh2d09 1.5 0.05 680 sumida cdrh2d11 3.3 0.10 450 3.2 x 3.2 x 1.2 = 12mm 3 cb2016 2.2 0.13 510 cbc2016 2.2 0.20 750 2.0 x 1.25 x 1.45 = 3.6mm 3 cb2518 2.2 0.09 510 2.0 x 1.6 x 1.8 = 5.8mm 3 cbc2518 2.2 0.13 890 2.5 x 1.8 x 2.0 = 9mm 3 1.5 0.08 1200 taiyo yuden nr3010 3.3 0.14 840 3.2 x 3.2 x 1.2 = 12mm 3 mdt2520-cr 2.2 0.08 700 2.5 x 2.0 x 1.0 = 5mm 3 1.5 0.11 900 toko d2812c 1.3 0.17 730 2.8 x 2.8 x 1.2 = 9.4mm 3 l1 = fdk mipf2520 series 1.5 h for max8581 3.3 h for max8582 c1, c2 = taiyo yuden jmk105bj225mv-b out gnd refin gnd in hp shdn l1 c1 c2 figure 2. example pcb layout and routing scheme
max8581/max8582 2.5mhz/1.5mhz step-down converters with 60m ? bypass in tdfn for cdma pa power _______________________________________________________________________________________ 9 pa cka ge information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .) 6, 8, &10l, dfn thin.eps h 1 2 21-0137 package outline, 6,8,10 & 14l, tdfn, exposed pad, 3x3x0.80 mm
max8581/max8582 2.5mhz/1.5mhz step-down converters with 60m ? bypass in tdfn for cdma pa power maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 10 2007 maxim integrated products is a registered trademark of maxim integrated products, inc. package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .) common dimensions symbol min. max. a0.700 .80 d2.903 .10 e2.903 .10 a1 0.00 0.05 l0.200 .40 pkg. code n d2 e2 e jedec spec b [(n/2)-1] x e package variations 0.25 min. k a2 0.20 ref. 2.300.10 1.500.10 6 t633-1 0.95 bsc mo229 / weea 1.90 ref 0.400.05 1.95 ref 0.300.05 0.65 bsc 2.300.10 8 t833-1 2.00 ref 0.250.05 0.50 bsc 2.300.10 10 t1033-1 2.40 ref 0.200.05 - - - - 0.40 bsc 1.700.10 2.300.10 14 t1433-1 1.500.10 1.500.10 mo229 / weec mo229 / weed-3 0.40 bsc - - - - 0.200.05 2.40 ref t1433-2 14 2.300.10 1.700.10 t633-2 6 1.500.10 2.300.10 0.95 bsc mo229 / weea 0.400.05 1.90 ref t833-2 8 1.500.10 2.300.10 0.65 bsc m o229 / weec 0.300.05 1.95 ref t833-3 8 1.500.10 2.300.10 0.65 bsc m o229 / weec 0.300.05 1.95 ref -drawing not to scale- h 2 2 21-0137 package outline, 6,8,10 & 14l, tdfn, exposed pad, 3x3x0.80 mm 2.300.10 mo229 / weed-3 2.00 ref 0.250.05 0.50 bsc 1.500.10 10 t1033-2 revision history pages changed at rev 1: 1, 3, 8, 9, 10
max8581 part number table english ? ? ?Z ? ??? what's new products solutions design appnotes support buy company members didn't find what you need? notes: 1. see the max8581 quickview data sheet for further information on this product family or download the max8581 full data sheet (pdf, 564kb). 2. other options and links for pu rchasing parts are listed at: http://www.maxim-ic.com/sales . 3. didn't find what you need? ask our applications engineers. expert assistance in finding parts, usually within one business day. 4. part number suffixes: t or t&r = tape and reel; + = rohs/lead-free ; # = rohs/lead-exempt. more: see full data sheet or part naming conventions . 5. * some packages have variations, listed on the drawing. "pkgcode/v ariation" tells which variation the product uses. part number free sample buy direct package: type pins size drawing code/var * temp rohs/lead-free? materials analysis max8581etb+ sample buy thin qfn (dual);10 pin;3x3x0.8mm dwg: 21-0137i (pdf) use pkgcode/variation: t1033+1 * -40c to +85c rohs/lead-free: yes materials analysis max8581etb+t buy thin qfn (dual);10 pin;3x3x0.8mm dwg: 21-0137i (pdf) use pkgcode/variation: t1033+1 * -40c to +85c rohs/lead-free: yes materials analysis contact us: send us an email copyright ? 2007 by maxim integrated products, dallas semiconductor ? legal notices ? privacy policy pa g e 1 of 2 max8581 - part number table - maxim/dallas 31-jul-2007 mhtml:file://c:\temp \maxm\max8581etb+t.mht
pa g e 2 of 2 max8581 - part number table - maxim/dallas 31-jul-2007 mhtml:file://c:\temp \maxm\max8581etb+t.mht
max8582 part number table english ? ? ?Z ? ??? what's new products solutions design appnotes support buy company members didn't find what you need? notes: 1. see the max8582 quickview data sheet for further information on this product family or download the max8582 full data sheet (pdf, 564kb). 2. other options and links for pu rchasing parts are listed at: http://www.maxim-ic.com/sales . 3. didn't find what you need? ask our applications engineers. expert assistance in finding parts, usually within one business day. 4. part number suffixes: t or t&r = tape and reel; + = rohs/lead-free ; # = rohs/lead-exempt. more: see full data sheet or part naming conventions . 5. * some packages have variations, listed on the drawing. "pkgcode/v ariation" tells which variation the product uses. part number free sample buy direct package: type pins size drawing code/var * temp rohs/lead-free? materials analysis max8582etb+ sample buy thin qfn (dual);10 pin;3x3x0.8mm dwg: 21-0137i (pdf) use pkgcode/variation: t1033+1 * -40c to +85c rohs/lead-free: yes materials analysis max8582etb+t buy thin qfn (dual);10 pin;3x3x0.8mm dwg: 21-0137i (pdf) use pkgcode/variation: t1033+1 * -40c to +85c rohs/lead-free: yes materials analysis contact us: send us an email copyright ? 2007 by maxim integrated products, dallas semiconductor ? legal notices ? privacy policy pa g e 1 of 2 max8582 - part number table - maxim/dallas 31-jul-2007 mhtml:file://c:\temp \maxm\max8582etb+t.mht
pa g e 2 of 2 max8582 - part number table - maxim/dallas 31-jul-2007 mhtml:file://c:\temp \maxm\max8582etb+t.mht

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