mp8801 low dropout 150ma linear regulator mp8801 rev. 1.9 www.monolithicpower.com 1 10/10/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. the future of analog ic technology description the mp8801 is a low-noise, low-dropout linear regulator. it operates from a 2.7v to 6.5v input voltage and regulates the output voltage with 2% accuracy at 2.5v, 2.85v or 3.3v. the internally set output voltage may be overridden with an external resistor divider from 1.25v to 5v. the mp8801 can supply up to 150ma of load current. the mp8801 features thermal overload protection and is available in a 5-pin tsot23-5 package. fixed voltage part numbers part number output voltage mp8801dj ? 2.5 2.5v mp8801dj ? 2.85 2.85v mp8801dj ? 3.3 3.3v evaluation board reference board number output* dimensions ev8801dj-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 100mv dropout at 100ma output ? 2% accurate output voltage ? fixed output voltage options of 2.5v, 2.85v or 3.3v ? adjustable output voltage 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 for mps green status, please visit mps website under quality assurance. ?mps? and ?the future of analog ic technology? are registered trademarks o f monolithic power systems, inc. typical application mp8801dj-x.x fb out 4 5 gnd 2 en in 3 1 output 1.5v 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 160 140 120 100 80 60 40 20 0 v dropout (mv) 0 20 40 60 80 100 120 140 160 i load (ma) v dropout vs i load
mp8801 ? low dropout, 150ma linear regulator mp8801 rev. 1.9 www.monolithicpower.com 2 10/10/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. ordering information part number* package top marking free air temperature (t a ) mp8801dj?2.5 mp8801dj?2.85 mp8801dj?3.3 tsot23-5 -40 c to +85 c * for tape & reel, add suffix ?z (g. mp8801dj?2.85?z). for rohs compliant packaging, add suffix ?lf (e.g. mp8801dj?2.85?lf?z) package reference top view marking in gnd en 1 2 3 5 4 out fb 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) ??????????????????...0.56w 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 ...........................150ma maximum maximum junction temp. (t j ) ................+125 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 powe r 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 approximately 1? square of 1 oz copper
mp8801 ? low dropout, 150ma linear regulator mp8801 rev. 1.9 www.monolithicpower.com 3 10/10/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 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 ground pin current i out = 1ma?150ma 125 150 a shutdown current v en = 0v, v in = 5v 0.1 1 a 1.197 1.222 1.246 fb regulation adjustable -40 c t a 85 c 1.194 1.222 1.249 v 2.450 2.500 2.550 2.5v -40 c t a 85 c 2.448 2.500 2.562 v 2.793 2.850 2.907 2.85v -40 c t a 85 c 2.779 2.850 2.921 v 3.234 3.300 3.366 output voltage accuracy 3.3v -40 c t a 85 c 3.218 3.300 3.382 v v out = 3v 150 dropout voltage (6) i out = 150ma v out = 4v 125 mv line regulation i out = 1ma, v in = (v out + 0.5v) to 6.5v (7) 0.005 %/v load regulation i out = 1ma to 150ma, v in = v out + 0.5v (7) 0.001 %/ma v in > v out +0.5v, c3 = 2.2 f, v in (ac) = 100mv, f = 1khz (5) 70 db psrr v in > v out +0.5v, c3 = 2.2 f, v in (ac) = 100mv, f = 1mhz (5) 30 db output voltage noise f = 1khz, c2 > 0.1 f, i out = 1ma (5) 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 (5) 155 c thermal protection hysteresis (5) 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
mp8801 ? low dropout, 150ma linear regulator mp8801 rev. 1.9 www.monolithicpower.com 4 10/10/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 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. load-transient response (circuit in figure 3) line-transient response (circuit in figure 3) 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) v out vs. v in 135 130 125 120 115 110 105 0 50 100 150 i load (ma) i gnd vs i load 135 130 125 120 115 110 105 80 70 60 50 40 30 20 10 psrr (db) 234567 0.01 0.1 1 10 100 1000 v in (v) i gnd vs v in frequency (hz) frequency (khz) output noise spectral density 128 102.4k frequency (hz) 128 102.4k output noise spectral density 160 140 120 100 80 60 40 20 0 v dropout (mv) 0 20 40 60 80 100 120 140 160 i load (ma) v dropout vs i load psrr vs frequency i out = 150ma 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 v in = 2.7v i load = 150ma i load = 150ma 4v 3v 2.85v
mp8801 ? low dropout, 150ma linear regulator mp8801 rev. 1.9 www.monolithicpower.com 5 10/10/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. pin functions pin # name description 1 in power source input. in supplies the internal po wer to the mp8801 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 mp8801; 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. the 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 mp8801 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 mp8801 uses a pmos pass element and features internal thermal shutdown. the normally fixed output mp8801 may be converted to an adjustable output device by applying a resistor divider network as shown in figure 2. an optional feed-forward capacitor, c byp , may be added for an improved transient response. v in v en c3 gnd fb out in 1 en v out -- + bandgap reference internal resistor divider c byp 2 3 4 5 figure 1?ultra-low-noise fixed output regulator v in v en c out c byp r1 r2 v out -- + bandgap reference gnd fb out external resistor divider 1 2 3 4 5 figure 2?ultra-low-noise adjustable regulator: v out = v fb (1+(r1/r2))
mp8801 ? low dropout, 150ma linear regulator mp8801 rev. 1.9 www.monolithicpower.com 6 10/10/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. application information setting the output voltage the fixed output voltage of the mp8801dj 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 ? in order to minimize the impact of the internal resistor divider. for an accurate output-voltage setting, use 10k ? ( 1%) for the low-side resistor r2 of the voltage divider, while 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 ( ? ) r2 ( ? ) 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 10k in figures 3 and 4, c2 is added for an improved transient response. input capacitor selection for proper operation, place a ceramic capacitor (c1) between 1f and 10f of dielectric type x5r or x7r between the input pin and ground. larger values in this range will help improve line transient response at the drawback of increased size. output capacitor selection for stable operation, use a ceramic capacitor (c3) of type x5r or x7r between 1f and 10f. larger values in this range will help improve load transient response and reduce noise with the drawback of increased size. output capacitors of other dielectric types may be used, but are not recommended as their capacitance can deviate greatly from their rated value over temperature. to improve load transient response, add a small ceramic (x5r, x7r or y5v dielectric) 100nf feed forward capacitor in parallel with r1. the feed forward capacitor is not required for stable operation.
mp8801 ? low dropout, 150ma linear regulator mp8801 rev. 1.9 www.monolithicpower.com 7 10/10/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. typical application circuit mp8801dj-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) mp8801dj-x.x fb out 4 5 gnd 2 en in 3 1 output 2v v in 2.7v to 6.5v v in figure 4?typical application circuit (adjustable)
mp8801 ? low dropout, 150ma linear regulator mp8801 rev. 1.9 www.monolithicpower.com 8 10/10/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. pcb layout guide pcb layout is very important to achieve good regulation, 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 6 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. mp8801 fb out in gnd en vout vin en r3 c1 c3 r1 r2 c2 figure 5 ?typical application circuit c1 1 2 34 5 in en gnd fb out c3 in out gnd r1 r2 c2 c3 r3 figure 6 ? top layer
mp8801 ? low dropout, 150ma linear regulator notice : the information in this document is subject to change wi thout notice. users should warrant and guarantee that third party intellectual property rights are not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. mp8801 rev. 1.9 www.monolithicpower.com 9 10/10/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. package information tsot23-5 0.30 0.50 seating plane 0.95 bsc 0.84 0.90 1.00 max 0.00 0.10 top view front view side view recommended land pattern 2.80 3.00 1.50 1.70 2.60 3.00 1 3 4 5 0.09 0.20 note: 1) all dimensions are in millimeters. 2) package length does not include mold flash, protrusion or gate burr. 3) package width does not include interlead flash or protrusion. 4) lead coplanarity (bottom of leads after forming) shall be 0.10 millimeters max. 5) drawing conforms to jedec mo-193, variation aa. 6) drawing is not to scale. 0.30 0.50 0 o -8 o 0.25 bsc gauge plane 2.60 typ 1.20 typ 0.95 bsc 0.60 typ see detail "a" detail a
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