mp8903 low dropout 150ma linear regulator mp8903 rev. 1.1 www.monolithicpower.com 1 9/21/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. the future of analog ic technology description the mp8903 is a 150ma low-dropout linear regulator that can operate from 2.7v to 6.5v input. it regulates the output with 2% accuracy and comes with preset 2.5v, 2.85v or 3.3v output. an external resistor divider may be used to adjust the output voltage from 1.25v to 5v. the mp8903 has thermal protection to guard against harsh operating conditions, and is available in small 2x2 8-pin qfn and 5-pin tsot23 packages. features ? 2.7v to 6.5v input voltage range ? 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 ? low 100mv dropout at 100ma output ? 2% accurate output voltage ? stable with low-esr output capacitors ? thermal protection ? available in tiny 2x2 8-pin qfn and tsot23-5 packages applications ? 802.11 pc cards ? mobile handset pll power ? audio codec power ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application mp8903dx-x.x fb out gnd en in 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 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
mp8903 ? low dropout, 150ma linear regulator mp8903 rev. 1.1 www.monolithicpower.com 2 9/21/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. package reference top view gnd en in in 1 2 3 4 fb nc out out 8 7 6 5 part number* package temp mp8903dg ? 2.5 mp8903dg ? 2.85 mp8903dg ? 3.3 qfn8 2mm x 2mm ?40 c to +85 c * for tape & reel, add suffix ?z (eg. mp8903dg?2.85?z) for rohs compliant packaging, add suffix ?lf (eg. mp8903dg?2.85?lf?z) 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 junction temperature ...............................150 c lead temperature ....................................260 c storage temperature ............. ?65c to +150 c top view marking in gnd en 1 2 3 5 4 out fb part number** package temp mp8903dj ? 2.5 mp8903dj ? 2.85 mp8903dj ? 3.3 tsot23-5 ?40 c to +85 c ** for tape & reel, add suffix ?z (eg. mp8903dj?2.85?z) for rohs compliant packaging, add suffix ?lf (eg. mp8903dj?2.85?lf?z) recommended operating conditions (2) input voltage .................................. 2.7v to 6.5v output voltage................................. 1.25v to 5v load current........................... 150ma maximum operating temperature .............?40 c to +85 c thermal resistance (3) ja jc tsot23-5.............................. 220 .... 110.. c/w 2x2 qfn8 ............................... 80 ...... 16... c/w notes: 1) exceeding these ratings may damage the device. 2) the device is not guaranteed to function outside of its operating conditions. 3) measured on approximately 1? square of 1 oz copper. electrical characteristics v in = 5v, t a = +25 c, unless otherwise noted. parameter symbol condition min typ max units operating voltage i out = 1ma 2.7 6.5 v output voltage accuracy i out = 1ma, v out = 1.5v to 5v 1.0 2.0 % 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 150 dropout voltage (5) i out = 150ma v out = 4v 125 mv
mp8903 ? low dropout, 150ma linear regulator mp8903 rev. 1.1 www.monolithicpower.com 3 9/21/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. electrical characteristics v in = 5v, t a = +25 c, unless otherwise noted. parameter symbol condition min typ max units line regulation i out = 1ma, v in = (v out + 0.5v) to 6.5v (6) 0.005 0.08 %/v load regulation i out = 1ma to 150ma, v in = v out + 0.5v (6) 0.001 0.02 %/ma v in > v out +0.5v, c3 = 2.2f, v in (ac) = 100mv, f = 1khz (4) 50 db psrr v in > v out +0.5v, c3 = 2.2f, v in (ac) = 100mv, f = 1mhz (4) 20 db en input high voltage 1.5 v en input low voltage 0.4 v en input bias current v en = 0v 0.01 1 a thermal protection (4) 155 c thermal protection hysteresis (4) 30 c notes: 4) parameter is guaranteed by design, not production tested. 5) dropout voltage is defined as the input to output different ial when the output voltage drops 1% below its normal value. 6) v in = 2.7v for v out = 1.25v to 2.2v
mp8903 ? low dropout, 150ma linear regulator mp8903 rev. 1.1 www.monolithicpower.com 4 9/21/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. typical performanc e characteristics v in = 4.5v, v out = 2.85v, c1 = 1f, c2 = 0.1f, c3 = 2.2f, t a = +25 c unless otherwise noted. 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 234567 v in (v) i gnd vs v in 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 i load = 1ma i load = 1ma v in = 6.5v v in = 5.0v v in = 2.7v i load = 150ma i load = 150ma
mp8903 ? low dropout, 150ma linear regulator mp8903 rev. 1.1 www.monolithicpower.com 5 9/21/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. pin functions 2x2 qfn8 pin # tsot23-5 pin # name description 1 2 gnd ground. 2 3 en enable input. drive en high to turn on the mp8903; low to turn it off. for automatic startup, connect en to in. 3, 4 1 in power source input. in supplies the internal power to the mp8903 and is the source of the pass transistor. bypass in to gnd with a 1f or greater capacitor. 5, 6 5 out regulator output. out is the output of the linear regulator. bypass out to gnd with a 1f or greater capacitor. 7 nc no connect. 8 4 fb feedback input. connect a resistive voltage divider from out to fb to set the output voltage. the out feedback threshold is 1.222v. operation the mp8903 is a low-current, low-dropout linear regulator. the mp8903 uses a pmos pass element and features internal thermal shutdown. the normally fixed output mp8903 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 v out -- + bandgap reference internal resistor divider c byp figure 1?fixed output regulator v in v en c out c byp r1 r2 v out -- + bandgap reference gnd fb out external resistor divider figure 2?adjustable regulator: v out = v fb (1+(r1/r2))
mp8903 ? low dropout, 150ma linear regulator mp8903 rev. 1.1 www.monolithicpower.com 6 9/21/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. application information setting the output voltage the fixed output voltage of the mp8903 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 1 f and 10 f 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 1 f and 10 f. 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.
mp8903 ? low dropout, 150ma linear regulator mp8903 rev. 1.1 www.monolithicpower.com 7 9/21/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. typical application circuit mp8903dx-2.85 fb out 8 5, 6 gnd 1 en in 2 3, 4 output 2.85v v in 2.7v to 6.5v v in c2 100nf figure 3?typical application circuit (fixed) mp8903dx-x.x fb out 8 5, 6 gnd 1 en in 2 3, 4 output 2v v in 2.7v to 6.5v v in figure 4?typical application circuit (adjustable)
mp8903 ? low dropout, 150ma linear regulator mp8903 rev. 1.1 www.monolithicpower.com 8 9/21/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. package information 2mm x 2mm qfn8 top view 1 8 54 bottom view 1.90 2.10 0.45 0.65 1.90 2.10 1.05 1.25 0.50 bsc 0.18 0.30 pin 1 id marking 0.60 0.50 0.25 recommended land pattern 1.90 note: 1) all dimensions are in millimeters. 2) exposed paddle size does not include mold flash. 3) lead coplanarity shall be 0.10 millimeter max. 4) drawing conforms to jedec mo-229, variation vccd-3. 5) drawing is not to scale. pin 1 id see detail a 0.70 pin 1 id option a r0.20 typ. pin 1 id option b r0.20 typ. detail a 0.25 0.45 pin 1 id index area side view 0.00 0.05 0.80 1.00 0.20 ref 1.20
mp8903 ? 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. mp8903 rev. 1.1 www.monolithicpower.com 9 9/21/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. 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
|
