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general description the max8805w/max8805x/max8805y/max8805zhigh-frequency step-down converters are optimized for dynamically powering the power amplifier (pa) in wcdma or ncdma handsets. the devices integrate a high-efficiency pwm step-down converter for medium- and low-power transmission, and a 60m ? typical bypass fet to power the pa directly from the batteryduring high-power transmission. dual 200ma low-noise, high-psrr low-dropout regulators (ldos) for pa bias- ing are also integrated. two switching frequency options are available (2mhz for the max8805w/max8805y and 4mhz for the max8805x/ max8805z), allowing optimization for smallest solution size or highest efficiency. fast switching allows the use of small ceramic 2.2? input and output capacitors while maintaining low ripple voltage. the feedback network is integrated, further reducing external component count and total solution size. the max8805w/max8805x/max8805y/max8805z use an analog input driven by an external dac to control the output voltage linearly for continuous pa power adjustment. the refin to out gain is available in two options (2v/v for the max8805y/max8805z and 2.5v/v for the max8805w/max8805x). at high-duty cycle, the max8805w/max8805x/max8805y/max8805z auto- matically switch to the bypass mode, connecting the input to the output through a low-impedance (60m ? typ) mosfet. the user can also enable the bypassmode directly through a logic-control input. the ldos in the max8805w/max8805x/max8805y/ max8805z are designed for low-noise operation (35? rms typ). each ldo is individually enabled through its own logic control interface.the max8805w/max8805x/max8805y/max8805z are available in 16-bump, 2mm x 2mm wlp and ucsp packages (0.7mm max height). features ? pa step-down converter 7.5? (typ) settling time for 0.8v to 3.4v output voltage change dynamic output voltage setting from 0.4v to v batt 60m ? pfet and 100% duty cycle for low dropout 2mhz or 4mhz switching frequencylow output-voltage ripple 600ma (max8805y/max8805z) or 650ma (max8805w/max8805x) output drivecapability 2% gain accuracytiny external components ? dual low-noise ldos low 35? rms (typ) output noise high 70db (typ) psrrguaranteed 200ma output drive capability individual on/off control ? low 0.1? shutdown current ? 2.7v to 5.5v supply voltage range ? thermal shutdown ? tiny 2mm x 2mm x 0.7mm wlp and ucsppackages (4 x 4 grid) max8805w/max8805x/max8805y/max8805z 600ma/650ma pwm step-down converters in 2mm x 2mm wlp for wcdma pa power ________________________________________________________________ maxim integrated products 1 ordering information 19-0777; rev 5; 2/10 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. + denotes a lead-free/rohs-compliant package. t = tape and reel. * xy is the output voltage code (see table 1). note: all devices are specified over the -40? to +85? operating temperature range. ordering information continued at end of data sheet. pin configuration appears at end of data sheet. evaluation kit available part pin-package switching frequency refin to out gain max8805w erexy+t* 16 ucsp 2mhz 2.5v/v max8805x erexy+t* 16 ucsp 4mhz 2.5v/v max8805y erexy+t* 16 ucsp 2mhz 2v/v max8805z erexy+t* 16 ucsp 4mhz 2v/v applications wcdma/ncdma cellular handsetswireless pdas smartphones ucsp is a trademark of maxim integrated products, inc. downloaded from: http:///
max8805w/max8805x/max8805y/max8805z 600ma/650ma pwm step-down converters in 2mm x 2mm wlp for wcdma pa power 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics(v in1a = v in1b = v in2 = v pa_en = v en1 = v en2 = 3.6v, v hp = 0v, v refin = 0.9v (max8805y/max8805z), v refin = 0.72v (max8805w/max8805x), 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 ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. in1a, in1b, in2, refin, en2, refbp to agnd ...-0.3v to +6.0v paa, pab, pa_en, hp to agnd....-0.3v to (v in1a /v in1b + 0.3v) ldo1, ldo2, en1 to agnd ......................-0.3v to (v in2 + 0.3v) in2 to in1b/in1a ...................................................-0.3v to +0.3v pgnd to agnd .....................................................-0.3v to +0.3v lx current ......................................................................0.7a rms in1a/in1b and paa/pab current .....................................2a rms paa and pab short circuit to pgnd or in1_.............continuous continuous power dissipation (t a = +70?) 16-bump ucsp (derate 12.5mw/? above +70?) ..........1w 16-bump wlp (derate 12.5mw/? above +70?).............1w junction temperature ......................................................+150? storage temperature range .............................-65? to +150? bump temperature (soldering, reflow) ............................+260? parameter conditions min typ max units input supply input voltage v in1a , v in1b , v in2 2.7 5.5 v input undervoltage threshold v in1a , v in1b , v in2 rising, 180mv typical hysteresis 2.52 2.63 2.70 v t a = +25 c 0.1 4 shutdown supply current v pa_en = v en1 = v en2 = 0v t a = +85 c 0.1 ? v pa_en = 0v, i ldo1 = i ldo2 = 0ma 150 250 max8805w/max8805y 3500 v en1 = v en2 = 0v, i pa = 0ma, switching max8805x/max8805z 5000 no-load supply current v en1 = v en2 = 0v, v hp = 3.6v 150 ? thermal protection thermal shutdown t a rising, 20 c typical hysteresis +160 c logic control pa_en, en1, en2, hp logic-input high voltage 2.7v v in1a = v in1b = v in2 5.5v 1.4 v pa_en, en1, en2, hp logic-input low voltage 2.7v v in1a = v in1b = v in2 5.5v 0.4 v t a = +25 c 0.01 1 logic-input current(pa_en, en1, en2, hp) v il = 0v or v ih = v in1a = 5.5v t a = +85 c 0.1 ? refin max8805y/max8805z 0.1 2.2 refin common-mode range max8805w/max8805x 0.1 1.76 v v refin = 0.4v, 0.9v, 1.7v, 2.2v (i lx = 0ma) max8805y/max8805z 1.96 2.00 2.04 refin to pa_ gain v refin = 0.32v, 0.75v, 1.32v, 1.76v (i lx = 0ma) max8805w/max8805x 2.45 2.50 2.55 v/v max8805y/max8805z 540 refin input resistance max8805w/max8805x 320 k note: this device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device can be exposed to during board level solder attach and rework. this limit permits only the use of the solder profiles recom-mended in the industry-standard specification, jedec 020a, paragraph 7.6, table 3 for ir/vpr and convection reflow. preheating is required. hand or wave soldering is not allowed. downloaded from: http:///
max8805w/max8805x/max8805y/max8805z 600ma/650ma pwm step-down converters in 2mm x 2mm wlp for wcdma pa power _______________________________________________________________________________________ 3 parameter conditions min typ max units max8805y/max8805z 0.44 x v in2 0.465 x v in2 0.48 x v in2 refindual mode threshold v refin rising, 50mv hysteresis max8805w/max8805x 0.36 x v in2 0.372 x v in2 0.39 x v in2 v lx p-channel mosfet switch, i lx = -40ma 0.18 0.6 on-resistance n-channel mosfet rectifier, i lx = 40ma 0.15 0.6 ? t a = +25? 0.1 5 lx leakage current v in1a = v in1b = v in2 = 5.5v, v lx = 0v t a = +85? 1 ? max8805y/max8805z 0.7 0.9 1.1 peak current limit(p-channel mosfet) v lx = 0v max8805w/max8805x 0.75 0.95 1.15 a max8805y/max8805z 0.5 0.7 0.9 valley current limit(n-channel mosfet) max8805w/max8805x 0.55 0.75 0.95 a max8805y/max8805z 0.1 minimum on- and off-times max8805w/max8805x 0.07 ? power-up delay from pa_en rising to lx rising 150 250 ? bypass t a = +25 c 0.060 0.1 on-resistance p-channel mosfet bypass,i out = -90ma t a = +85 c 0.1 ? bypass current limit v pa _ = 0v 0.8 1.2 1.8 a max8805y/max8805z 0.7 0.9 1.1 s tep - d ow n c ur r ent li m i t i n byp ass v lx = 0v max8805w/max8805x 0.75 0.95 1.15 a max8805y/max8805z 1.5 2.1 2.9 total bypass current limit v lx = v pa _ = 0v max8805w/max8805x 1.55 2.15 2.95 a t a = +25 c 0.01 10 bypass off-leakage current v in1a = v in1b = v in2 = 5.5v, v paa = v pab = 0v t a = +85 c1 ? ldo1 max8805_e_eaa+t 1.746 1.8 1.854 max8805_e_ebc+t 2.425 2.5 2.575 max8805_e_ecc+t 2.619 2.7 2.781 max8805_e_edd+t 2.716 2.8 2.884 max8805_e_eee+t 2.765 2.85 2.936 output voltage v ldo1 v in2 = 5.5v, i ldo1 = 1ma; v in2 = 3.4v, i ldo1 = 100ma max8805_e_egg+t 2.910 3.0 3.090 v output current 200 ma current limit v ldo1 = 0v 250 550 750 ma dropout voltage i ldo1 = 100ma, t a = +25 c (v ldo1 2.5v) 70 200 mv line regulation v in2 stepped from 3.5v to 5.5v, i ldo1 = 100ma 2.4 mv load regulation i ldo1 stepped from 50? to 200ma 25 mv power-supply rejection 10hz to 10khz, c ldo1 = 1?, i ldo1 = 30ma 70 db electrical characteristics (continued)(v in1a = v in1b = v in2 = v pa_en = v en1 = v en2 = 3.6v, v hp = 0v, v refin = 0.9v (max8805y/max8805z), v refin = 0.72v (max8805w/max8805x), t a = -40? to +85?. typical values are at t a =+25?, unless otherwise noted.) (note 1) dual mode is a trademark of maxim integrated products, inc. downloaded from: http:///
max8805w/max8805x/max8805y/max8805z 600ma/650ma pwm step-down converters in 2mm x 2mm wlp for wcdma pa power 4 _______________________________________________________________________________________ electrical characteristics (continued)(v in1a = v in1b = v in2 = v pa_en = v en1 = v en2 = 3.6v, v hp = 0v, v refin = 0.9v (max8805y/max8805z), v refin = 0.72v (max8805w/max8805x), t a = -40? to +85?. typical values are at t a =+25?, unless otherwise noted.) (note 1) parameter conditions min typ max units output noise 100hz to 100khz, c ldo1 = 1?, i ldo1 = 30ma 35 ? rms 0 < i ldo1 < 10ma 100 nf output capacitor for stableoperation 0 < i ldo1 < 200ma 1 ? shutdown output impedance v en1 = 0v 1 k ? ldo2 max8805_e_eaa+t 1.746 1.8 1.854 max8805_e_eac+t 2.619 2.7 2.781 max8805_e_ead+t 2.716 2.8 2.884 max8805_e_ebe+t 2.765 2.85 2.936 output voltage v ldo2 v in2 = 5.5v, i ldo2 = 1ma; v in2 = 3.4v, i ldo2 = 100ma max8805_e_egg+t 2.910 3.0 3.090 v output current 200 ma current limit v ldo2 = 0v 250 550 750 ma dropout voltage i ldo2 = 100ma, t a = +25 c 70 200 mv line regulation v in2 stepped from 3.5v to 5.5v, i ldo2 = 100ma 2.4 mv load regulation i ldo2 stepped from 50? to 200ma 25 mv power-supply rejection ? v ldo2 / ? v in2 10hz to 10khz, c ldo2 = 1?, i ldo2 = 30ma 70 db output noise 100hz to 100khz, c ldo2 = 1?, i ldo2 = 30ma 35 ? rms 0? < i ldo2 < 10ma 100 nf output capacitor for stableoperation 0? < i ldo2 < 200ma 1 ? shutdown output impedance v en2 = 0v 1 k ? refbp refbp output voltage 0 i refbp 1? 1.237 1.250 1.263 v refbp supply rejection v in2 stepped from 2.55v to 5.5v 0.2 5 mv note 1: all devices are 100% production tested at t a = +25?. limits over the operating temperature range are guaranteed by design. downloaded from: http:///
max8805w/max8805x/max8805y/max8805z 600ma/650ma pwm step-down converters in 2mm x 2mm wlp for wcdma pa power _______________________________________________________________________________________ 5 typical operating characteristics (v in1a = v in1b = v in2 = 3.6v, v pa_ = 1.2v, v ldo1 = 2.85v, v ldo2 = 2.85v, r pa = 7.5 ? , circuit of figure 5, t a = +25?, unless oth- erwise noted.) 0 4020 8060 120100 140 0 0.4 0.6 0.2 0.8 1.0 1.2 1.4 1.6 1.8 bypass mode dropout voltage vs. pa load current max8805w/x/y/z toc01 pa load current (a) bypass mode dropout voltage (mv) v in1 = 3.2v v in1 = 3.6v 60 70 80 90 100 0.5 1.5 2.5 3.5 1.0 2.0 3.0 4.0 4.5 pa step-down converter efficiency vs. output voltage (max8805x/max8805z) max8805w/x/y/z toc02 output voltage (v) efficiency (%) bypass mode v in1 = 4.2v v in1 = 3.6v v in1 = 3.2v r pa = 7.5 ? 60 70 80 90 100 0.5 1.5 2.5 3.5 1.0 2.0 3.0 4.0 4.5 pa step-down converter efficiency vs. output voltage (max8805w/max8805y) max8805w/x/y/z toc03 output voltage (v) efficiency (%) bypass mode v in1 = 4.2v v in1 = 3.6v v in1 = 3.2v r pa = 7.5 60 70 80 90 100 0.5 1.5 2.5 3.5 1.0 2.0 3.0 4.0 4.5 pa step-down converter efficiency vs. output voltage (max8805x/max8805z) max8805w/x/y/z toc04 output voltage (v) efficiency (%) bypass mode v in1 = 4.2v v in1 = 3.6v v in1 = 3.2v r pa = 10 ? 60 70 80 90 100 0.5 1.5 2.5 3.5 1.0 2.0 3.0 4.0 4.5 pa step-down converter efficiency vs. output voltage (max8805w/max8805y) max8805w/x/y/z toc05 output voltage (v) efficiency (%) bypass mode v in1 = 4.2v v in1 = 3.6v v in1 = 3.2v r pa = 10 ? 50 60 8070 90 100 0 200 100 300 400 500 600 700 pa step-down converter efficiency vs. load current (max8805x/max8805z) max8805w/x/y/z toc06 load current (ma) efficiency (%) v in1 = 3.2v v pa_ = 1.8v v in1 = 3.6v v in1 = 4.2v 50 60 8070 90 100 0 200 100 300 400 500 600 700 pa step-down converter efficiency vs. load current (max8805w/max8805y) max8805w/x/y/z toc07 load current (ma) efficiency (%) v in1 = 3.2v v pa_ = 1.8v v in1 = 3.6v v in1 = 4.2v 50 60 8070 90 100 02 0 0 100 300 400 500 600 700 pa step-down converter efficiency vs. load current (max8805x/max8805z) max8805w/x/y/z toc08 load current (ma) efficiency (%) v in1 = 3.2v v pa_ = 1.2v v in1 = 3.6v v in1 = 4.2v 50 60 8070 90 100 02 0 0 100 300 400 500 600 700 pa step-down converter efficiency vs. load current (max8805w/max8805y) max8805w/x/y/z toc09 load current (ma) efficiency (%) v in1 = 3.2v v pa_ = 1.2v v in1 = 3.6v v in1 = 4.2v downloaded from: http:///
max8805w/max8805x/max8805y/max8805z 600ma/650ma pwm step-down converters in 2mm x 2mm wlp for wcdma pa power 6 _______________________________________________________________________________________ typical operating characteristics (continued) (v in1a = v in1b = v in2 = 3.6v, v pa_ = 1.2v, v ldo1 = 2.85v, v ldo2 = 2.85v, r pa = 7.5 ? , circuit of figure 5, t a = +25?, unless oth- erwise noted.) 50 60 8070 90 100 0 200 100 300 400 500 600 700 pa step-down converter efficiency vs. load current (max8805x/max8805z) max8805w/x/y/z toc10 load current (ma) efficiency (%) v in1 = 3.2v v pa_ = 0.6v v in1 = 3.6v v in1 = 4.2v 50 60 8070 90 100 02 0 0 100 300 400 500 600 700 pa step-down converter efficiency vs. load current (max8805w/max8805y) max8805w/x/y/z toc11 load current (ma) efficiency (%) v in1 = 3.2v v pa_ = 0.6v v in1 = 3.6v v in1 = 4.2v 1.251.20 1.15 1.10 1.05 0 300 100 200 400 500 600 700 pa step-down converter output voltage vs. load current max8805w/x/y/z toc12 load current (ma) output voltage (v) max8805x/max8805z max8805w/max8805y 0.5 1.51.0 2.52.0 3.53.0 4.0 0 0.8 0.4 1.2 1.6 2.0 pa step-down converter output voltage vs. refin voltage max8805y/z toc13 refin voltage (v) output voltage (v) max8805x/max8805w max8805y/max8805z -100 -60-80 0 -20-40 20 40 8060 100 0.4 0.6 0.7 0.5 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 refin vs. refin to out gain (max8805z) max8805y/z toc14 refin voltage (v) output voltage error (mv) v in1 = 3.2v, no load v in1 = 4.2v, no load -50 -30 -10 10 30 50 0.4 0.6 0.7 0.5 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 refin vs. refin to out gain (max8805y) max8805y/z toc15 refin voltage (v) output voltage error (mv) v in1 = 3.2v, no load v in1 = 4.2v, no load downloaded from: http:///
-50 -30 -10 10 30 50 0.4 0.7 0.8 0.5 0.6 0.9 1.0 1.1 1.2 1.3 refin vs. refin to out gain (max8805x) max8805w/x/y/z toc16 refin voltage (v) output voltage error (mv) v in1 = 3.2v, no load v in1 = 4.2v, no load -50 -30 -10 10 30 50 0.4 0.7 0.8 0.5 0.6 0.9 1.0 1.1 1.2 1.3 refin vs. refin to out gain (max8805w) max8805w/x/y/z toc17 refin voltage (v) output voltage error (mv) v in1 = 3.2v, no load v in1 = 4.2v, no load 400ns/div pa step-down converter light-load switching waveforms (max8805x/max8805z) v pa_ ac-coupled i lx 200ma/div 20mv/div2v/div max8805w/x/y/z toc18 v lx v pa_ = 1.2v, i pa_ = 50ma max8805w/max8805x/max8805y/max8805z 600ma/650ma pwm step-down converters in 2mm x 2mm wlp for wcdma pa power _______________________________________________________________________________________ 7 400ns/div pa step-down converter light-load switching waveforms (max8805w/max8805y) v pa_ ac-coupled i lx 200ma/div 20mv/div2v/div max8805w/x/y/z toc19 v lx v pa_ = 1.2v, i pa_ = 50ma 400ns/div pa step-down heavy-load switching waveforms (max8805x/max8805z) v pa_ ac-coupled i lx 500ma/div 20mv/div2v/div max8805w/x/y/z toc20 v lx v pa_ = 1.2v, i pa_ = 500ma 400ns/div pa step-down heavy-load switching waveforms (max8805w/max8805y) v pa_ ac-coupled i lx 500ma/div 20mv/div2v/div max8805w/x/y/z toc21 v lx v pa_ = 1.2v, i pa_ = 500ma typical operating characteristics (continued) (v in1a = v in1b = v in2 = 3.6v, v pa_ = 1.2v, v ldo1 = 2.85v, v ldo2 = 2.85v, r pa = 7.5 ? , circuit of figure 5, t a = +25?, unless oth- erwise noted.) _______________________________________________________________________________________ 7 downloaded from: http:///
max8805w/max8805x/max8805y/max8805z 600ma/650ma pwm step-down converters in 2mm x 2mm wlp for wcdma pa power 8 _______________________________________________________________________________________ typical operating characteristics (continued) (v in1a = v in1b = v in2 = 3.6v, v pa_ = 1.2v, v ldo1 = 2.85v, v ldo2 = 2.85v, r pa = 7.5 ? , circuit of figure 5, t a = +25?, unless oth- erwise noted.) 10 s/div pa step-down converter load transient response (max8805x/max8805z) i pa_ i lx 500ma/div 500ma/div100mv/div max8805w/x/y/z toc26 v pa_ ac-coupled 0ma 500ma 0ma 10 s/div pa step-down converter load transient response (max8805w/max8805y) i pa_ i lx 500ma/div 500ma/div100mv/div max8805w/x/y/z toc27 v pa_ ac-coupled 0ma 500ma 0ma 10 s/div pa step-down converter line transient response (max8805w/max8805y) v in1_ v pa_ ac-coupled 50mv/div 500mv/div200ma/div max8805w/x/y/z toc25 i lx 4.0v 3.5v 4.0v 10 s/div pa step-down converter line transient response (max8805x/max8805z) v in1_ v pa_ ac-coupled 50mv/div 500mv/div200ma/div max8805w/x/y/z toc24 i lx 4.0v 3.5v 4.0v 20 s/div pa step-down soft-start waveforms (max8805x/max8805z) v pa_en v pa_ 1v/div 2v/div500ma/div max8805w/x/y/z toc22 i lx 20 s/div pa step-down soft-start waveforms (max8805w/max8805y) v pa_en v pa_ 1v/div 2v/div200ma/div max8805w/x/y/z toc23 i lx downloaded from: http:///
max8805w/max8805x/max8805y/max8805z 600ma/650ma pwm step-down converters in 2mm x 2mm wlp for wcdma pa power _______________________________________________________________________________________ 9 10 s/div pa step-down converter output voltage transient response (max8805y/max8805z) v refin v pa_ 500mv/div 500mv/div500ma/div max8805w/x/y/z toc28 i lx 0.5v 1v 0.5v 20 s/div pa step-down converter forced bypass-fet transient response (max8805y/max8805z) v hp v pa_ 2v/div 2v/div500ma/div max8805w/x/y/z toc29 i lx 1.5v 0v 0v 1.2v 1.2v 3.6v 10 s/div pa step-down converter output voltage transient response (max8805w/max8805x) v refin v pa_ 500mv/div 500mv/div500ma/div max8805w/x/y/z toc30 i lx 1.25v 0.66v 0.66v 20 s/div pa step-down converter bypass-fet transient response (max8805w/max8805x) v hp v pa_ 2v/div 2v/div500ma/div max8805w/x/y/z toc31 i lx 3.6v 1.2v 2v 0v 1.2v 0v 10 s/div pa step-down converter automatic bypass-fet transient response (max8805y/max8805z) v refin v pa_ 2v/div 1v/div500ma/div max8805w/x/y/z toc32 i lx 1.8v 0.6v 0.6v 1.2v 1.2v 3.6v 200 s/div pa step-down converter automatic bypass-fet transient response (max8805y/max8805z) v refin v pa_ 1v/div 1v/div500ma/div max8805w/x/y/z toc33 i lx v refin is a 0.4v to 2v sinusoidalsignal 3.6v typical operating characteristics (continued) (v in1a = v in1b = v in2 = 3.6v, v pa_ = 1.2v, v ldo1 = 2.85v, v ldo2 = 2.85v, r pa = 7.5 ? , circuit of figure 5, t a = +25?, unless oth- erwise noted.) downloaded from: http:///
max8805w/max8805x/max8805y/max8805z 600ma/650ma pwm step-down converters in 2mm x 2mm wlp for wcdma pa power 10 ______________________________________________________________________________________ 0 50 100 150 200 ldo1, ldo2 supply current vs. supply voltage max8805w/x/y/z toc38 supply voltage (v) no-load supply current ( a) 2.0 3.5 4.0 2.5 3.0 4.5 5.0 5.5 0 30 9060 120 150 ldo1, ldo2 dropout voltage vs. load current max8805w/x/y/z toc39 load current (ma) ldo1, ldo2 dropout voltage (mv) 01 0 0 50 150 200 10 s/div pa step-down converter shutdown response (max8805x/max8805z) v pa_en v pa_ 2v/div 2v/div 100ma/div max8805w/x/y/z toc37 i lx 0v 2v 1.2v 10 s/div pa step-down converter automatic bypass-fet transient response (max8805w/max8805x) v refin v pa_ 2v/div 1v/div500ma/div max8805w/x/y/z toc34 i lx 1.2v 0.48v 3.6v 1.44v 0.48v 1.2v 200 s/div pa step-down converter automatic bypass-fet transient response (max8805w/max8805x) v refin v pa_ 1v/div 1v/div500ma/div max8805w/x/y/z toc35 i lx 3.6v v refin is a 0.48v to 2.1v sinsoidalsignal 10 s/div pa step-down converter shutdown response (max8805w/max8805y) v pa_en v pa_ 1v/div 2v/div 100ma/div max8805w/x/y/z toc36 i lx 0v 2v 1.2v typical operating characteristics (continued) (v in1a = v in1b = v in2 = 3.6v, v pa_ = 1.2v, v ldo1 = 2.85v, v ldo2 = 2.85v, r pa = 7.5 ? , circuit of figure 5, t a = +25?, unless oth- erwise noted.) downloaded from: http:///
max8805w/max8805x/max8805y/max8805z 600ma/650ma pwm step-down converters in 2mm x 2mm wlp for wcdma pa power ______________________________________________________________________________________ 11 ldo psrr vs. frequency max8805w/x/y/z toc40 frequency (khz) psrr (db) 100 10 1 0.1 20 30 40 50 60 70 8010 0.01 1000 i ldo_ = 30ma ldo output noise spectral density vs. frequency max8805w/x/y/z toc41 frequency (khz) output noise density (nv/ hz) 100 10 1 0.1 1.0e+02 1.0e+03 1.0e+041.0e+01 0.01 1000 400 s/div ldo1, ldo2 output noise waveform 50mv/div max8805w/x/y/z toc42 20 s/div ldo line transient response 500mv/div max8805w/x/y/z toc43 4.0v 4.0v 3.5v i ldo_ = 80ma 5mv/div v in2 v ldo_ 20 s/div ldo1, ldo2 load transient response near dropout 100ma/div50mv/div 100ma/div max8805w/x/y/z toc44 0ma 80ma v in2 = v ldo1,2 + 200mv 50mv/div i ldo1 v ldo1 i ldo2 v ldo2 0ma 0ma 0ma 80ma 1ms/div ldo1, ldo2 turn on and shutdown response 2v/div2v/div 2v/div max8805w/x/y/z toc45 v en1,2 v ldo1 v ldo2 typical operating characteristics (continued) (v in1a = v in1b = v in2 = 3.6v, v pa_ = 1.2v, v ldo1 = 2.85v, v ldo2 = 2.85v, r pa = 7.5 ? , circuit of figure 5, t a = +25?, unless oth- erwise noted.) downloaded from: http:///
max8805w/max8805x/max8805y/max8805z 600ma/650ma pwm step-down converters in 2mm x 2mm wlp for wcdma pa power 12 ______________________________________________________________________________________ pin description pin name function a1 refbp reference noise bypass. bypass refbp to agnd with a 0.22? ceramic capacitor to reduce noise on theldo outputs. refbp is internally pulled down through a 1k resistor during shutdown. a2 agnd low-noise analog ground a3 refin dac-controlled input. the output of the pa step-down converter is regulated to 2 x v refin for the max8805y/max8805z and 2.5 x v refin for the max8805w/max8805x. when v refin reaches 0.465 x v in2 for the max8805y/max8805z and 0.372 x v in2 for the max8805w/max8805x, bypass mode is enabled. a4 pgnd power ground for pa step-down converter b1 ldo2 200ma ldo regulator 2 output. bypass ldo2 with a 1? ceramic capacitor as close as possible to ldo2and agnd. ldo2 is internally pulled down through a 1k resistor when this regulator is disabled. b2 pa_en pa step-down converter enable input. connect to in_ or logic-high for normal operation. connect to gndor logic-low for shutdown mode. b3 en2 ldo2 enable input. connect to in2 or logic-high for normal operation. connect to agnd or logic-low forshutdown mode. b4 lx inductor connection. connect an inductor from lx to the output of the pa step-down converter. c1 in2 supply voltage input for ldo1, ldo2, and internal reference. connect in2 to a battery or supply voltagefrom 2.7v to 5.5v. bypass in2 with a 2.2? ceramic capacitor as close as possible to in2 and agnd. connect in2 to the same source as in1a and in1b. c2 hp high-power mode set input. drive hp high to invoke forced bypass mode. bypass mode connects theinput of the pa step-down converter directly to its output through the internal bypass mosfet. drive hp low to disable the forced bypass mode. c3, c4 in1b, in1a supply voltage input for pa step-down converter. connect in1_ to a battery or supply voltage from 2.7v to5.5v. bypass the connection of in1_ with a 2.2? ceramic capacitor as close as possible to in1_, and pgnd. in1a and in1b are internally connected together. connect in1_ to the same source as in2. d1 ldo1 200ma ldo regulator 1 output. bypass ldo1 with a 1? ceramic capacitor as close as possible to ldo1and agnd. ldo1 is internally pulled down through a 1k resistor when this regulator is disabled. d2 en1 ldo1 enable input. connect to in2 or logic-high for normal operation. connect to agnd or logic-low forshutdown mode. d3, d4 pab, paa pa connection for bypass mode. internally connected to in1_ using the internal bypass mosfet during bypass mode. pa_ is connected to the internal feedback network. bypass pa_ with a 2.2? ceramic capacitor as close as possible to pa_ and pgnd. downloaded from: http:///
max8805w/max8805x/max8805y/max8805z 600ma/650ma pwm step-down converters in 2mm x 2mm wlp for wcdma pa power ______________________________________________________________________________________ 13 pwm logic step-down current limit pwm error comparator current-limit control lxpgnd paa bypass fet hp refin r2 r1 r3 r5 r4 r6 r7 c2 c1 in2 r8r7 error amperror amp ldo1 current limitldo2 current limit bandgapbandgap ldo1 r11 r10 ldo2 r9 r12 1.25v reference control logic refbp agnd bandgap en1 en2 pa_en pab in1b in1a figure 1. block diagram downloaded from: http:///
max8805w/max8805x/max8805y/max8805z 600ma/650ma pwm step-down converters in 2mm x 2mm wlp for wcdma pa power 14 ______________________________________________________________________________________ detailed description the max8805w/max8805x/max8805y/max8805z aredesigned to dynamically power the pa in wcdma and ncdma handsets. the devices contain a high-frequency, high-efficiency step-down converter, and two ldos. the max8805y/max8805z step-down converters deliver over 600ma, while the max8805w/max8805x deliver over 650ma. the hysteretic pwm control scheme pro- vides extremely fast transient response, while 2mhz and 4mhz switching-frequency options allow the trade-off between efficiency and the smallest external compo- nents. a 60m ? bypass fet connects the pa directly to the battery during high-power transmission. step-down converter 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. the control scheme is simple: when the output voltage is below the regulation threshold, the error comparator begins a switching cycle by turning on the high-side switch. this high-side switch remains on until the mini- mum on-time expires and the output voltage is within regulation, or the inductor current is above the current- limit threshold. once off, the high-side switch remains off until the minimum off-time expires and the output voltage falls again below the regulation threshold. during the off 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 max8805w/max8805x/max8805y/max8805z step-down converters utilize a unique feedback network. by taking dc feedback from the lx node through r1 in figure 1, the usual phase lag due to the output capacitor is removed, making the loop exceedingly stable and allowing the use of very small ceramic output capacitors. to improve the load regulation, resistor r3 is included in the feedback. this configuration yields load regulation equal to half of the inductor? series resistance multiplied by the load current. this voltage-positioning load regula- tion greatly reduces overshoot during load transients or when changing the output voltage from one level to anoth- er. however, when calculating the required refin volt- age, the load regulation should be considered. because inductor resistance is typically well specified and the typical pa is a resistive load, the max8805y/max8805z v refin to v out gain is slightly less than 2v/v, and the max8805w/max8805x v refin to v out gain is slightly less than 2.5v/v. the output voltage is aproximately: v out = (refin to pa_gain) x v refin - 1/2 x l esr x i load step-down converter bypass mode during high-power transmission, the bypass mode con-nects in1a and in1b directly to paa and pab with the internal 60m ? (typ) bypass fet, while the step-down converter is forced into 100% duty-cycle operation. thelow on-resistance in this mode provides low dropout, long battery life, and high output current capability. forced and automatic bypass mode invoke forced bypass mode by driving hp high orinvoke automatic bypass mode by applying a high volt- age to refin. to prevent excessive output ripple as the step-down converter approaches dropout, the max8805y/max8805z enter bypass mode automatical- ly when v refin > 0.465 x v in2 (see figure 2) and max8805w/max8805x enter bypass mode automati-cally when v refin > 0.372 x v in2 . note that in2 is used instead of in1 to prevent switching noise from causingfalse enagement of automatic bypass mode. for this reason, in2 must be connected to the same source as in1. shutdown mode connect pa_en to gnd or logic-low to place themax8805w/max8805x/max8805y/max8805z pa step-down converter in shutdown mode. in shutdown, the control circuitry, internal switching mosfet, and synchronous rectifier turn off and lx becomes high impedance. connect pa_en to in1_ or logic-high for normal operation. connect en1 or en2 to gnd or logic-low to place ldo1 or ldo2, respectively, in shutdown mode. in 0 1.00.5 2.01.5 3.02.5 3.5 4.54.0 5.0 01 01 52 0 52 5 3 0 3 5 4 5 40 50 time (ms) in2 and pa_ voltage (v) refin voltage (v) in2pa_ refin 0 0.5 1.0 1.5 2.0 2.5 figure 2. v in2 and v pa_ with automatic entry/exit into bypass mode (max8805y/max8805z) downloaded from: http:///
max8805w/max8805x/max8805y/max8805z 600ma/650ma pwm step-down converters in 2mm x 2mm wlp for wcdma pa power ______________________________________________________________________________________ 15 shutdown, the outputs of the ldos are pulled to groundthrough an internal 1k ? resistor. when the pa step-down and ldos are all in shutdown,the max8805w/max8805x/max8805y/max8805z enter a very low power state, where the input current drops to 0.1? (typ). step-down converter soft-start the max8805w/max8805x/max8805y/max8805z pastep-down converter has internal soft-start circuitry that limits inrush current at startup, reducing transients on the input source. soft-start is particularly useful for supplies with high output impedance such as li+ and alkaline cells. see the pa step-down soft-start waveforms (max8805x/max8805z) and pa step-down soft-start waveforms (max8805w/max8805y) in the typical operating characteristics. analog refin control the max8805w/max8805x/max8805y/max8805z pastep-down converter uses refin to set the output volt- age. this allows the converter to operate in applications where dynamic voltage control is required. thermal shutdown thermal shutdown limits total power dissipation in themax8805w/max8805x/max8805y/max8805z. if the junction temperature exceeds +160?, thermal-shut- down circuitry turns off the ic, allowing it to cool. the ic turns on and begins soft-start after the junction temper- ature cools by 20?. this results in a pulsed output dur- ing continuous thermal-overload conditions. applications information output voltages the max8805w/max8805x/max8805y/max8805z pastep-down converters set the pa_ output voltage based on the voltage applied to refin. ldo1 and ldo2 output voltages are determined by the part number suffix, as shown in table 1. ldo dropout voltage the regulator? minimum input/output differential (ordropout voltage) determines the lowest usable supply voltage. in battery-powered systems, this determines the useful end-of-life battery voltage. because the max8805w/max8805x/max8805y/max8805z ldos use a p-channel mosfet pass transistor, their dropout volt- ages are a function of drain-to-source on-resistance (r ds(on) ) multiplied by the load current (see the typical operating characteristics ). inductor selection the max8805w/max8805y operate with a switchingfrequency of 2mhz and utilize a 2.2? inductor. the max8805x/max8805z operate with a switching fre- quency of 4mhz and utilize a 1? inductor. the higher switching frequency of the max8805x/max8805z allow the use of physically smaller inductors at the cost of slightly lower efficiency. the lower switching frequency of the max8805w/max8805y results in greater efficien- cy at the cost of a physically larger inductor. see the typical operating characteristics for efficiency graphs for both the max8805w/max8805y and max8805x/max8805z. the inductor? dc current rating only needs to match the maximum load of the application because the max8805w/max8805x/max8805y/max8805z feature zero current overshoot during startup and load tran- sients. for optimum transient response and high efficien- cy, choose an inductor with dc series resistance in the 50m ? to 150m ? range. see table 2 for suggested inductors and manufacturers. output capacitor selection for the pa step-down converter, the output capacitor(c pa ) is required to keep the output voltage ripple small and ensure regulation loop stability. c pa must have low impedance at the switching frequency. ceramic capaci-tors with x5r or x7r dielectric are highly recommended table 1. ldo1 and ldo2 output voltageselection note: contact the factory for other output-voltage options. part frequency (mhz) ldo1 (v) ldo2 (v) max8805we_eaa+t 2 1.80 1.80 max8805we_eae+t 2 1.80 2.85 max8805we_eee+t 2 2.85 2.85 max8805xe_eaa+t 4 1.80 1.80 max8805xe_eae+t 4 1.80 2.85 max8805xe_eee+t 4 2.85 2.85 max8805ye_eaa+t 2 1.80 1.80 max8805ye_eae+t 2 1.80 2.85 max8805ye_eee+t 2 2.85 2.85 max8805ze_eaa+t 4 1.80 1.80 max8805ze_eae+t 4 1.80 2.85 max8805ze_eee+t 4 2.85 2.85 downloaded from: http:///
max8805w/max8805x/max8805y/max8805z 600ma/650ma pwm step-down converters in 2mm x 2mm wlp for wcdma pa power 16 ______________________________________________________________________________________ due to their small size, low esr, and small temperaturecoefficients. due to the unique feedback network, the output capacitance can be very low. a 2.2? capacitor is recommended for most applications. for optimum load-transient performance and very low output ripple, the output capacitor value can be increased. for ldo1 and ldo2, the minimum output capacitance required is dependent on the load currents. for loads less than 10ma, it is sufficient to use a 0.1? capacitor for stable operation over the full temperature range. with rated maximum load currents, a minimum of 1? is recommended. reduce output noise and improve load- transient response, stability, and power-supply rejec-tion by using larger output capacitors. note that some ceramic dielectrics exhibit large capaci- tance and esr variation with temperature. with dielectrics such as z5u and y5v, it is necessary to use 2.2? or larg- er to ensure stability at temperatures below -10?. with x7r or x5r dielectrics, 1? is sufficient at all operating temperatures. these regulators are optimized for ceramic capacitors. tantalum capacitors are not recommended. input capacitor selection the input capacitor (c in1 ) of the pa converter reduces the current peaks drawn from the battery or inputpower source and reduces switching noise in the table 2. suggested inductors manufacturer series inductance (?) esr ( ) current rating (ma) dimensions (mm) coilcraft lpo3310 1.01.5 2.2 0.070.10 0.13 16001400 1100 3.3 x 3.3 x 1.0 = 11mm 3 mipf2520 1.01.5 2.2 0.050.07 0.08 15001500 1300 2.5 x 2.0 x 1.0 = 5mm 3 mips2520 1.32.0 0.090.11 15001200 2.5 x 2.0 x 1.0 = 5mm 3 fdk mipf2016 1.02.2 0.11 1100 2.0 x 1.6 x 1.0 = 3.2mm 3 hitachi ksli-252010 1.52.2 0.1150.080 2.5 x 2.0 x 1.0 = 5mm 3 murata lqh32c_53 1.02.2 0.060.10 1000 790 3.2 x 2.5 x 1.7 = 14mm 3 sumida cdrh2d09 1.21.5 2.2 0.080.09 0.12 590520 440 3.0 x 3.0 x 1.0 = 9mm 3 cdrh2d11 1.52.2 3.3 0.050.08 0.10 680580 450 3.2 x 3.2 x 1.2 = 12mm 3 taiyo yuden cb2518t 2.24.7 0.090.13 510340 2.5 x 1.8 x 2.0 = 9mm 3 d3010fb 1.0 0.20 1170 3.0 x 3.0 x 1.0 = 9mm 3 d2812c 1.22.2 0.090.15 860640 3.0 x 3.0 x 1.2 = 11mm 3 d310f 1.52.2 0.130.17 12301080 3.6 x 3.6 x 1.0 = 13mm 3 toko d312c 1.52.2 0.100.12 12901140 3.6 x 3.6 x 1.2 = 16mm 3 downloaded from: http:///
max8805w/max8805x/max8805y/max8805z 600ma/650ma pwm step-down converters in 2mm x 2mm wlp for wcdma pa power ______________________________________________________________________________________ 17 max8805w/max8805x/max8805y/max8805z. theimpedance of c in1 at the switching frequency should be kept very low. ceramic capacitors with x5r or x7rdielectric are highly recommended due to their small size, low esr, and small temperature coefficients. a 2.2? capacitor is recommended for most applications. for optimum noise immunity and low input ripple, the input capacitor value can be increased. for the ldos, use an input capacitance equal to the value of the sum of the output capacitance of ldo1 and ldo2. larger input capacitor values and lower esr pro- vide better noise rejection and line transient response. note that some ceramic dielectrics exhibit large capaci- tance and esr variation with temperature. with dielectrics such as z5u and y5v, it may be necessary to use two times the sum of the output capacitor values of ldo1 and ldo2 (or larger) to ensure stability at temper- atures below -10?. with x7r or x5r dielectrics, a capacitance equal to the sum is sufficient at all operating temperatures. thermal considerations in most applications, the max8805w/max8805x/max8805y/max8805z do not dissipate much heat due to their high efficiency. however, in applications where the max8805w/max8805x/max8805y/max8805z run at high ambient temperature with heavy loads, the heat dissipated may exceed the maximum junction tempera- ture of the ic. if the junction temperature reaches approximately +160?, all power switches are turned off and lx and pa_ become high impedance, and ldo1 and ldo2 are pulled down to ground through an internal 1k ? pulldown resistor. the max8805w/max8805x/max8805y/max8805zmaximum power dissipation depends on the thermal resistance of the ic package and circuit board, the temperature difference between the die junction and ambient air, and the rate of airflow. the power dissipat- ed in the device is: p diss = p pa x (1/ pa - 1) + i ldo1 x (v in2 - v ldo1 ) + i ldo2 x (v in2 - v ldo2 ) where pa is the efficiency of the pa step-down con- verter and p pa is the output power of the pa step-down converter.the maximum allowed power dissipation is: p max = (t jmax - t a ) / ja where (t jmax - t a ) is the temperature difference between the max8805w/max8805x/max8805y/max8805z die junction and the surrounding air; ja is the thermal resistance of the junction through the pcb,copper traces, and other materials to the surrounding air. pcb layout high switching frequencies and relatively large peakcurrents 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, resulting in a stable and well-regulated output. connect c in1 close to in1a/in1b and pgnd. connect the inductor and output capacitor as close as possibleto the ic and keep their traces short, direct, and wide. keep noisy traces, such as the lx node, as short as possible. figure 3 illustrates an example pcb layout and routing scheme. downloaded from: http:///
max8805w/max8805x/max8805y/max8805z 600ma/650ma pwm step-down converters in 2mm x 2mm wlp for wcdma pa power 18 ______________________________________________________________________________________ refin vin pa_en en1 ldo1 ldo2 hp 5.5mm en2 agnd pgnd 3.8mm c in2 c pa c byp c ldo2 c ldo1 vpa l pa c in1 figure 3. recommended pcb layout downloaded from: http:///
max8805w/max8805x/max8805y/max8805z 600ma/650ma pwm step-down converters in 2mm x 2mm wlp for wcdma pa power ______________________________________________________________________________________ 19 2.2 f 2mhz or 4mhz buck 1 h or 2.2 h* lxpab pgnd paa in1a in1b en2 refin 2.2 f ref 0.22 f refbp agnd ldo1 0.1 f 0.1 f ldo2 in2 1 f pa_en hp en1 control en/bias in pa2 en/bias in pa1 gpiogpio gpio gpio dac baseband processor li+ battery ldo1 ldo2 max8805w max8805x max8805y max8805z *1 h fdk mips 2520d1r0 2.2 h fdk mipf 2520d2r2 figure 4. typical application circuit using ldos for pa enable/bias downloaded from: http:///
max8805w/max8805x/max8805y/max8805z 600ma/650ma pwm step-down converters in 2mm x 2mm wlp for wcdma pa power 20 ______________________________________________________________________________________ 2.2 f 2mhz or 4mhz buck 1 h or 2.2 h* lxpab pgnd paa in1a in1b en2 refin 2.2 f ref 0.22 f refbp agnd ldo1 1 f 1 f ldo2 in2 2.2 f pa_en hp en1 control rf transmitt er in in pa gpiogpio gpio gpio dac baseband processor li+ battery ldo1 ldo2 rf receiver in *1 h fdk mips 2520d1r0 2.2 h fdk mipf 2520d2r2 max8805w max8805x max8805y max8805z figure 5. typical application circuit using ldos for rf power downloaded from: http:///
max8805w/max8805x/max8805y/max8805z 600ma/650ma pwm step-down converters in 2mm x 2mm wlp for wcdma pa power ______________________________________________________________________________________ 21 refbp agnd ldo2 in2 refin en2 in1b pa_en (bump in bottom) 16-bump, 2mm 2mm wlp and ucsp hp ldo1 pab en1 pgnd lx in1a paa a1 a2 a3 a4 b1 b4 b3 b2 c1 c2 c3 c4 d1 d4 d3 d2 top view pin configuration chip information process: bicmos in1a lx paa 1 h batt 2.7v to 5.5v agnd pa_enrefin en1 en2 in2 batt 2.7v to 5.5v pa on/off analog control v pa 0.4v to v batt refbp in1b ldo1 on/offldo2 on/off pab ldo2 ldo1 v ldo2 up to 200ma pgnd hp forced bypass 2.2 f 2.2 f max8805x max8805z v ldo1 up to 200ma typical operating circuit ordering information (continued) part pin-package switching frequency refin to out gain max8805wewexy+t* 16 wlp 2mhz 2.5v/v max8805xewexy+t* 16 wlp 4mhz 2.5v/v max8805yewexy+t* 16 wlp 2mhz 2v/v max8805zewexy+t* 16 wlp 4mhz 2v/v + denotes a lead-free/rohs-compliant package. t = tape and reel. * xy is the output voltage code (see table 1). note: all devices are specified over the -40? to +85? operating temperature range. downloaded from: http:///
max8805w/max8805x/max8805y/max8805z 600ma/650ma pwm step-down converters in 2mm x 2mm wlp for wcdma pa power 22 ______________________________________________________________________________________ package information for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to th e package regardless of rohs status. ucsp.eps package type package code document no. 16 ucsp r162a2+1 21-0226 16 wlp w162b2+1 21-0200 downloaded from: http:///
max8805w/max8805x/max8805y/max8805z 600ma/650ma pwm step-down converters in 2mm x 2mm wlp for wcdma pa power ______________________________________________________________________________________ 23 package information (continued) for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to th e package regardless of rohs status. downloaded from: http:///
max8805w/max8805x/max8805y/max8805z 600ma/650ma pwm step-down converters in 2mm x 2mm wlp for wcdma pa power 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. 24 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2010 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 2 3/08 updating package information 21 3 5/08 corrected maximum range of y axis for toc 03 5 4 9/08 updated ec table, toc 13, and voltage-positioning load regulation section 1, 2, 3, 6, 14 5 2/10 added ucsp package 1?, 15, 22 downloaded from: http:///

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