mp8802 low dropout 250ma linear regulator mp8802 rev. 1.3 www.monolithicpower.com 1 4/8/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. the future of analog ic technology description the mp8802 is a low-noise, low-dropout linear regulator. it operates from 2.7v to 6.5v input voltage, and regulates the output voltage with 2% accuracy at 2.5v, 2.85v, 3.3v, or from 1.25v to 5v. the mp8802 can supply up to 250ma of load current. the mp8802 features thermal overload protection. it is available in a 5-pin tsot23-5 package. fixed voltage part numbers part number output voltage mp8802dj ? 2.5 2.5v mp8802dj ? 2.85 2.85v mp8802dj ? 3.3 3.3v evaluation board reference board number output* dimensions ev8802dj-00a 2.85v 2.0?x x 2.0?y x 0.4?z * default output voltage adjustable from 1.25v to 5.0v using an external resistor divider. features ? low 250mv dropout at 250ma output ? 2% accurate output voltage ? fixed output voltage options of 2.5v, 2.85v or 3.3v ? adjustable output voltage option from 1.25v to 5v using an external resistor divider ? up to 6.5v input voltage ? high psrr o 70db at 1khz o 30db at 1mhz ? better than 0.001%/ma load regulation ? stable with low-esr output capacitor ? low 125 a ground current ? internal thermal protection applications ? 802.11 pc cards ? mobile handset pll power ? audio codec power ?mps? and ?the future of analog ic technology? are trademarks of monolithic power systems, inc. typical application mp8802_tac_s01 mp8802dj-x.x fb out 4 5 gnd 2 en in 3 1 output 1.25v to 5v v in 2.7v to 6.5v v in en (pin3) may be connected to in (pin 1) directly the sum of r1 and r2 should not exceed 100k r1 r2 300 250 200 150 100 50 0 v dropout (mv) 0 50 100 150 200 250 300 i load (ma) mp8802_ec01 v dropout vs i load
mp8802 ? low dropout, 250ma linear regulator mp8802 rev. 1.3 www.monolithicpower.com 2 4/8/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. ordering information * for tape & reel, add suffix ?z. (eg. mp8802dj?2.85?z ); for rohs compliant packaging, add suffix ?lf. (eg. mp8802dj?2.85?lf?z) package reference absolute maxi mum ratings (1) in supply voltage .......................?0.3v to +7.0v fb voltage .........................?0.3v to v out + 0.3v all other pins .................................?0.3v to +6v continuous power dissipation (t a = +25c) (2) ??????????????????.0.57w junction temperature ...............................150 c lead temperature ....................................260 c storage temperature ............. ?65c to +150 c recommended operating conditions (3) input voltage...................................2.7v to 6.5v output voltage .................................1.25v to 5v load current ...........................250ma maximum operating temperature............. ?40 c to +85 c thermal resistance (4) ja jc tsot23-5.............................. 220 .... 110.. c/w notes: 1) exceeding these ratings may damage the device. 2) the maximum allowable power dissipation is a function of the maximum junction temperature t j (max), the junction-to- ambient thermal resistance ja , and the ambient temperature t a . the maximum allowable continuous power dissipation at any ambient temperature is calculated by p d (max)=(t j (max)- t a )/ ja . exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. internal thermal shutdown circuitry protects the device from permanent damage. 3) the device is not guaranteed to function outside of its operating conditions. 4) measured on jesd51-7 4-layer pcb.. part number* package top marking temperature mp8802dj ? 2.5 mp8802dj ? 2.85 mp8802dj ? 3.3 tsot23-5 i g6 ?40 c to +85 c top view marking in gnd en 1 2 3 5 4 out fb mp8802_pd01-tsot23-5
mp8802 ? low dropout, 250ma linear regulator mp8802 rev. 1.3 www.monolithicpower.com 3 4/8/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. electrical characteristics v in = 5v, t a = +25 c, unless otherwise noted. parameter symbol condition min typ (5) max units operating voltage i out = 1ma 2.7 6.5 v output voltage accuracy i out = 1ma, v out = 1.25v to 5v 2.0 1.0 2.0 % ground pin current i out = 1ma?250ma 125 155 a shutdown current v en = 0v, v in = 5v 0.1 1 a 1.197 1.222 1.246 fb regulation voltage ?40 c t a +85 c 1.194 1.222 1.249 v v out = 3v 230 dropout voltage (6) i out = 250ma v out = 4v 190 mv line regulation i out = 1ma, v in = (v out + 0.5v) to 6.5v (7) 0.005 0.08 %/v load regulation i out = 1ma to 250ma, v in = v out + 0.5v (7) 0.001 0.02 %/ma v in > v out +0.5v, c out = 2.2 f, v in (ac) = 100mv, f = 1khz 70 db psrr v in > v out + 0.5v, c out = 2.2 f, v in (ac) = 100mv, f = 1mhz 30 db output voltage noise f = 1khz, c fb > 0.1 f, i out = 1ma 300 nv/ hz en input high voltage 1.5 v en input low voltage 0.4 v en input bias current v en = 0v, 5v 0.01 1 a thermal protection 155 c thermal protection hysteresis 30 c notes: 5) parameter is guaranteed by design, not production tested. 6) dropout voltage is defined as the input to output different ial when the output voltage drops 1% below its normal value. 7) v in = 2.7v for v out = 1.25v to 2.2v
mp8802 ? low dropout, 250ma linear regulator mp8802 rev. 1.3 www.monolithicpower.com 4 4/8/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. typical performanc e characteristics v in = 4.5v, v out = 2.85v, c1 = 1 f, c2 = 0.1 f, c3 = 2.2 f, t a = +25 c unless otherwise noted. mp8802-tpc08 load-transient response (circuit in figure 4) line-transient response (circuit in figure 4) i load (50ma/div.) v out (20mv/div.) v in (1v/div.) v out (10mv/div.) 2.87 2.865 2.86 2.855 2.85 2.845 2.84 v out (v) 34567 v in (v) mp8802-tpc03 v out vs. v in 200 180 160 140 120 100 0 50 100 150 200 250 i load (ma) mp8802-tpc02 i gnd vs i load 180 170 160 150 140 130 120 110 100 80 70 60 50 40 30 20 10 psrr (db) 234567 0.01 0.1 1 10 100 1000 v in (v) mp8802-tpc01 i gnd vs v in frequency (hz) frequency (khz) mp8802-tpc06 mp8802-tpc09 output noise spectral density 128 102.4k frequency (hz) 128 102.4k mp8802-tpc05 output noise spectral density mp8802-tpc04 psrr vs frequency i out = 250ma i out = 1ma x: 1.024khz y: 240.013n x: 1.024khz y: 287.004n i load = 1ma i load = 1ma v in = 6.5v v in = 5.0v i load = 250ma i load = 250ma 4v 3v 2.85v 300 250 200 150 100 50 0 v dropout (mv) 0 50 100 150 200 250 300 i load (ma) mp8802_tpc07 v dropout vs i load
mp8802 ? low dropout, 250ma linear regulator mp8802 rev. 1.3 www.monolithicpower.com 5 4/8/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. pin functions pin # name description 1 in power source input. in supplies the internal power to the mp8802 and is the source of the pass transistor. bypass in to gnd with a 1 f or greater capacitor. 2 gnd ground. 3 en enable input. drive en high to turn on the mp8802, drive en low to turn it off. for automatic startup, connect en to in. 4 fb feedback input. connect a resistive voltage di vider from out to fb to set the output voltage. out feedback threshold is 1.222v. 5 out regulator output. out is the output of the linear regulator. bypass out to gnd with a 1 f or greater capacitor. operation the mp8802 is a low-current, low-noise, high-psrr, low-dropout, linear regulator. it is intended for use in devices that require very low noise power supplies and high-psrr such as pll vco supplies for mobile handsets and 802.11 pc cards, as well as audio codecs and microphones. the mp8802 uses a pmos pass element and features internal thermal shutdown. as shown in figures 1 and 2, optional feed- forward capacitor c byp may be added between fb and out pins for an improved transient response. mp8802_f01_bd01 v in v en c out gnd fb out v out -- + bandgap reference internal resistor divider c byp figure 1?ultra-low-noise fixed output regulator mp8802_f02_bd02 v in v en c out c byp r1 r2 v out -- + bandgap reference gnd fb out external resistor divider figure 2?ultra-low-noise adjustable regulator: v out = v fb (1+(r1/r2))
mp8802 ? low dropout, 250ma linear regulator mp8802 rev. 1.3 www.monolithicpower.com 6 4/8/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. application information setting the output voltage the fixed output voltage of the mp8802dj is set to 2.5v, 2.85v or 3.3v, depending on the internal resistor divider (figure 1). you can also adjust the output voltage by using an external resistor divider (r1 and r2 in figure 2). however, the sum of r1 and r2 should not exceed 100k ? to minimize the impact of the internal resistor divider. for accurate output- voltage setting, it is suggested to use 10k ? ( 1%) for the low-side resistor r2 of the voltage divider, the high side resistor r1 can be determined by the equation: ? ? ? ? ? ? ? ? ? = fb fb out v v v 2 r 1 r where v fb is the out feedback threshold voltage equal to 1.222v. example: for 2.5v output = ? ? ? ? ? ? ? = k 41 . 10 k 10 v 222 . 1 v 222 . 1 v 5 . 2 1 r you can select a standard 10.5k ? ( 1%) resistor for r1. the following table lists the selected r1 values for some typical output voltages: table 1?adjustable output voltage r1 values v out (v) r1 ( ? ) 1.25 232 1.5 2.26k 1.8 4.75k 2 6.34k 2.5 10.5k 2.8 13k 3 14.7k 3.3 16.9k 4 22.6k 5 30.9k in figures 3 and 4, c2 is added for an improved transient response.
mp8802 ? low dropout, 250ma linear regulator mp8802 rev. 1.3 www.monolithicpower.com 7 4/8/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. pcb layout guide pcb layout is very important to achieve good r egulation, ripple rejection, transient response and thermal performance. it is highly recommended to duplicate evb layout for optimum performance. if change is necessary, please follow these guidelines and take figure 5 for reference. 1) input and output bypass ceramic capacitors are suggested to be put close to the in pin and out pin respectively. 2) ensure all feedback connections are short and direct. place the feedback resistors and compensation components as close to the chip as possible. 3) connect in, out and especially gnd respectively to a large copper area to cool the chip to improve thermal performance and long-term reliability. mp8802_f05_tac03 mp8802 fb out gnd en en in v in v out r1 r3 r2 c1 c3 c2 top layer figure 5?pcb layout
mp8802 ? low dropout, 250ma linear regulator mp8802 rev. 1.3 www.monolithicpower.com 8 4/8/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. typical application circuit mp8802_f03_tac01 mp8802dj-2.85 fb out 4 5 gnd 2 en in 3 1 output 2.85v v in 2.7v to 6.5v v in c2 100nf figure 3?typical application circuit (fixed) mp8802_f03_tac01 mp8802dj-x.x fb out 4 5 gnd 2 en in 3 1 output 2v v in 2.7v to 6.5v v in c2 100nf figure 4?typical application circuit (adjustable)
mp8802 ? low dropout, 250ma linear regulator notice : the information in this document is subject to change wi thout notice. please contact mps for current specifications. users should warrant and guarantee that third party intellect ual property rights are not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. mp8802 rev. 1.3 www.monolithicpower.com 9 4/8/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. package information tsot23-5 gauge plane 0.25 bsc. 0.10 - + 0.400 0 0 4 (2 plcs) 10 T yp. 2.90 bsc (5 plcs) 0.300(min) l c typ. 0.950 l c typ. 0.950 2.80 bsc 1.60 bsc 3 3 0.500(max) seating plane 0.870.03 0.00-0.10 1.00 max. 0.127 typ. (2 plcs) 10? typ. 4. the footlength measuring is based on the 3. dimensions are exclusive of mold flash and gate burr. 2. die is facing up for mold. die is facing 1. dimensions and tolerances are as per ansi down for trim/form, ie. reverse trim/form. gauge plane method. y14.5m, 1994. note: 5. all specification comply to jedec spec mo193 issue c. dimensions are in millimeters
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