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general description the MAX8506/max8507/max8508 integrate a pwm step- down dc-dc regulator and a 75m ? (typ) bypass fet to power the pa in wcdma and cdmaone cell phones. the supply voltage range is from 2.6v to 5.5v, and the guaranteed output current is 600ma. one megahertz pwm switching allows for small external components. the MAX8506 and max8507 are dynamically controlled to provide varying output voltages from 0.4v to 3.4v. the max8508 is externally programmed for fixed 0.75v to 3.4v output. digital logic enables a high-power (hp) bypass mode that connects the output directly to the bat- tery for all versions. the MAX8506/max8507/max8508 are designed so the output settles in less than 30? for a full-scale change in output voltage and load current. the MAX8506/max8507/max8508 are offered in 16-pin 4mm x 4mm thin qfn packages (0.8mm max height). applications wcdma/ncdma cell phones wireless pdas, palmtops, and notebook computers wireless modems features ? integrated 75m ? (typ) bypass fet ? 38mv dropout at 600ma load ? up to 94% efficiency ? dynamically adjustable output from 0.4v to 3.4v (MAX8506, max8507) ? externally fixed output from 0.75v to 3.4v (max8508) ? 1mhz fixed-frequency pwm switching ? 600ma guaranteed output current ? shutdown mode 0.1a (typ) ? 16-pin thin qfn (4mm x 4mm, 0.8mm max height) MAX8506/max8507/max8508 pwm step-down dc-dc converters with 75m ? bypass fet for wcdma and cdmaone handsets ________________________________________________________________ maxim integrated products 1 ordering information 19-2918; rev 1; 1/04 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. part temp range pin-package MAX8506 ete -40? to +85? 16 thin qfn max8507 ete -40? to +85? 16 thin qfn max8508 ete -40? to +85? 16 thin qfn cdmaone is a trademark of cdma development group. pin configurations appear at end of data sheet. typical application circuits continued at end of data sheet. current- limit control pwm dac battp lx out comp pgnd gnd refin 1mhz osc ref hp input 2 6v to 5.5v 4.7h output 0.4v to 3.4v or v batt 4.7f 0.3? 0.4? 0 075 ? batt ref 2 2 f 0.22f skip shdn r c * c c * MAX8506 max8507 * 10 15 r c (k?) 1500 1000 c c (pf) 100 100 c f (pf) MAX8506 max8507 c f * t ypical application circuits (MAX8506/max8507)
MAX8506/max8507/max8508 pwm step-down dc-dc converters with 75m ? shdn skip hp in nd pnd nd p p nd n n s d p d p n s i hisis p shdn skip hp nd in in n p ndiins in p nis i h skip nd skip h d hp s s shdn nd in i in i in i in i i ? ? ? ?
MAX8506/max8507/max8508 pwm step-down dc-dc converters with 75m ? skip p n skip nd p ps skip nd hp p d skip nd d skip p p h s s si i h i inps shdn hp skip ih i i hshdn s sh ihisis p shdn skip hp nd in in n n s
MAX8506/max8507/max8508 pwm step-down dc-dc converters with 75m ? bypass fet for wcdma and cdmaone handsets 4 _______________________________________________________________________________________ t ypical operating characteristics (v batt = v battp = 3.6v, shdn = skip = batt, hp = gnd, t a = +25?, unless otherwise noted.) (see the typical application circuits .) efficiency vs. output voltage in normal mode MAX8506 t c01 output voltage (v) efficiency (%) 3.0 2 5 2.0 1 5 1.0 0 5 60 70 80 90 100 50 03 5 r load = 15? r load = 10? r load = 5? skip = gnd efficiency vs. output voltage in pwm mode MAX8506 t c02 output voltage (v) efficiency (%) 3 0 2.5 2 0 1.5 1 0 0 5 60 70 80 90 100 50 03.5 r load = 15? r load = 10? r load = 5? efficiency vs. input voltage 5 0 4 5 4.0 3.5 3 0 2 5 5.5 MAX8506 toc03 input voltage (v) efficiency (%) 60 70 80 90 100 50 v out = 0 4v v out = 1 2v v out = 3.4v skip = gnd r load = 10? load current (ma) 100 10 1 1000 efficiency vs. load current MAX8506 t c04 efficiency (%) 60 70 80 90 100 50 v out = 2.5v; normal mode v out = 2.5v; pwm v out = 1 2v; normal mode v out = 1 2v; pwm dropout voltage vs. load current MAX8506 t c05 load current (ma) output voltage (mv) 1500 1000 500 30 60 90 120 150 0 0 2000 v in = 3 6v hp = batt supply current vs. supply voltage in pwm mode MAX8506 toc06 supply voltage (v) supply current (ma) 5 0 4.5 4 0 3.5 3 0 2.5 1 2 3 4 5 6 0 2 0 5.5 v out = 1 2v v out = 0 4v 200 300 400 500 600 700 800 900 1000 100 supply current vs. supply voltage in normal mode MAX8506 toc07 supply voltage (v) supply current ( a) 5 04.54 03.53 02 5 2 0 5.5 v out = 1.2v v out = 3 4v v out = 0.4v skip = gnd heavy-load switching waveform MAX8506 toc08 1s/div v lx 2v/div v out ac-coupled 20mv/div v out = 1 2v load = 10?
MAX8506/max8507/max8508 pwm step-down dc-dc converters with 75m ? ? ? ? ? ? shdn skip hp nd s
MAX8506/max8507/max8508 pwm step-down dc-dc converters with 75m ? ? shdn s i d i nd pnd p nd in i p p nd s hp hp i d in d hp p n n pnd pnd p nd i d i p s p s i p pnd s p s i p skip s i nd skip p s i nd hp p p nd i
MAX8506/max8507/max8508 pwm step-down dc-dc converters with 75m ? skip nd p d p d p s p skip p p i p p d d n h p s d ps ? ? ?
MAX8506/max8507/max8508 pwm step-down dc-dc converters with 75m ? shdn nd i s i d shdn i s i p p p n s p s p s hp s i s d p d p dd in in in d d s nd s ? ? ? ? ? ? ? ? ? ?
MAX8506/max8507/max8508 pwm step-down dc-dc converters with 75m ? ? ? ?
MAX8506/max8507/max8508 pwm step-down dc-dc converters with 75m ? bypass fet for wcdma and cdmaone handsets 10 ______________________________________________________________________________________ 16 15 14 13 batt out batt 9 10 11 12 lx battp batt out 4 3 2 1 fb ref gnd 5678 comp hp n.c. pgnd shdn skip thin qfn 4mm x 4mm 16 15 14 13 batt out batt 9 10 11 12 lx battp batt out 4 3 2 1 refin ref gnd 5678 comp hp n.c. pgnd shdn skip thin qfn 4mm x 4mm top view max8508 MAX8506 max8507 pin configurations current- limit control pwm battp lx out fb comp pgnd gnd 1mhz osc ref hp input 2 6v to 5.5v 4.7h output 0.75v to 3 4v or v batt 4.7f 0.3? 0.4? 0 075 ? batt ref 2.2f 0 22 f skip shdn r c 5 6k ? c c 2700pf c f 100pf max8508 0.75v r1 r2 t ypical application circuits (max8508) (continued) chip information transistor count: 2020 process: bicmos
MAX8506/max8507/max8508 pwm step-down dc-dc converters with 75m ? bypass fet for wcdma and cdmaone handsets maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit 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 ____________________ 11 2004 maxim integrated products printed usa is a registered trademark of maxim integrated products. package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline information, go to www.maxim-ic.com/packages .) 24l qfn thin.eps b 1 2 21-0139 package outline 12,16,20,24l qfn thin, 4x4x0 8 mm b 2 2 21-0139 package outline 12,16,20,24l qfn thin, 4x4x0 8 mm

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