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MP20051 low noise, high psrr, 1a linear regulator MP20051 rev.1.11 www.monolithicpower.com 1 12/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. the future of analog ic technology description the MP20051 is a low-dropout linear regulator that supplies up to 1a current with a 140mv dropout voltage. the externally-adjustable output voltage has a range of 0.8v to 5v from an input voltage of 2.5v to 5.5v. an internal pmos pass element allows for a low 110 a ground current, making the MP20051 suitable for battery-powered devices. other features include low-power shutdown, and short- circuit and thermal protection. the MP20051 is available in 3mm x 3mm 8-pin qfn and soic8e packages. features ? up to 1a output current ? low 140mv dropout at 1a ? low 110 a ground current ? output voltage available from 0.8v to 5v ? low noise: 13 v rms typical (10hz to 100khz) ? 63db psrr @1khz ? stable with ceramic capacitor ? excellent load/line transient response ? current limiting and thermal protection ? available in 3mm x 3mm 8-pin qfn and soic8e packages applications ? notebook computers ? cordless telephones ? cellular phones ? wireless communication equipment ? hand-held instruments all mps parts are lead-free and adhere to the rohs directive. for mps green status, please visit mps website under quality assurance. ?mps? and ?the future of analog ic technology? are registered trademarks of monolithi c power systems, inc. typical application out r1 v0.8(1)volts r2 =+
MP20051 ? low noise high psrr 1a linear regulator MP20051 rev.1.11 www.monolithicpower.com 2 12/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. ordering information part number package top marking free air temperature (t a ) MP20051dq * qfn8 (3 x 3mm) abr MP20051dn** soic8e MP20051 -40c to +85c * for tape & reel, add suffix ?z (e.g. MP20051dq?z); for rohs compliant packaging, add suffix ?lf (e.g. MP20051dq?lf?z) ** for tape & reel, add suffix ?z (e.g. MP20051dn?z); for rohs compliant packaging, add suffix ?lf (e.g. MP20051dn?lf?z) package reference top view out out fb gnd 1 2 3 4 in in nc en 8 7 6 5 exposed pad on backside connect to gnd out out fb gnd in in nc en 1 2 3 4 8 7 6 5 top view exposed pad on backside connect to gnd qfn8 (3 x 3mm) soic8e absolute maxi mum ratings (1) vin, en, fb to gnd .......................-0.3v to +6v out to gnd ...................... -0.5v to (v in + 0.5v) continuous power dissipation ......(t a =25c) (2) qfn8 (3x3mm)................................................2.0w soic8e ............................................................2.0w junction temperature ...............................150 c storage temperature range ..... -65c to 150c lead temperature (soldering, 10sec)........... 260c esd susceptibility (3) hbm (human body mode).......................... 2kv mm (machine mode) ................................. 200v recommended operating conditions (4) supply input voltage.......................2.5v to 5.5v enable input voltage .........................0v to 5.5v operating junction temp. (t j ). -40c to +125c thermal resistance (5) ja jc qfn8 (3x3mm) .......................50 ...... 12 ... c/w soic8e ...................................50 ...... 10 ... 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) devices are esd sensitive. handling precaution recommended. 4) the device is not guaranteed to function outside of its operating conditions. 5) measured on jesd51-7, 4-layer pcb.
MP20051 ? low noise high psrr 1a linear regulator MP20051 rev.1.11 www.monolithicpower.com 3 12/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. electrical characteristics v in =v out +0.5v or v in =2.5v, en=v in , typical values are at t a =25c, unless otherwise specified parameter condition min typ max units input voltage 2.5 5.5 v input under voltage lockout v in rising 1.95 2.25 v hysteresis of uvlo 160 mv fb voltage v out =0.8v, i out =1ma 0.784 0.8 0.816 v i out =1ma, t a =25c -2 2 output voltage accuracy i out =1ma, -40 t a 85c -3 3 % maximum output current continuous, v in 2.5v, v out =2.5v 1 a short-circuit current limit v out =0, v in 2.5v 1.6 a in-regulation current limit v out =2.5v, v out within 4% of normal output voltage v in =5.5v 1.4 2.2 3.0 a i out =0.1ma, v out =2.5v 110 ground current i out =1a, v out =2.5v 600 a i out =1a, v out =2.5v 140 280 i out =750m, v out =2.5v 105 210 dropout voltage (6) i out =500ma, v out =2.5v 70 140 mv line regulation (7) v out =2.5v, v in from v out +0.5v to 5.5v, i out =100ma, -0.15 0.15 %/v load regulation (8) i out from 100ma to 1a, v out =2.5v 0.3 % v out =1.1v 13 v out =3.3v 35 output voltage noise i out =100ma, f ranges from 10hz to 100khz v out =5v 55 v rms f=100hz 65 f=1khz 63 f=10khz 63 psrr v in = 2.5v, v out = 1.1v, i out = 1a f=1mhz 33 db shutdown supply current v in =+5.5v 0.2 a en pin current , enabled v in =v en =+5.5v 0.2 a feedback pin current v in =+5.5v, v fb =6v 0.02 a startup time v out(nom) =2.5v, c out =4.7 f, v out =0% to 90%v out(nom) 45 s en logic high 1.5 en pin threshold en logic low 0.4 v thermal shutdown temperature typical thermal hysteresis =20c 150 c notes: 6) dropout voltage is defined as the input to output different ial when the output voltage drops 100mv below its nominal value. 7) line regulation= () in(max ) in(min) out v out v in(min) out(nom) in max vv (% / v) vv v ?? ?? ?? ?? ? ?? ? ?? 8) load regulation= () out(max ) out(min) out i out i out nom vv (%) v ?? ?? ?? ?? ?
MP20051 ? low noise high psrr 1a linear regulator MP20051 rev.1.11 www.monolithicpower.com 4 12/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. pin functions pin # name pin function 1, 2 vout regulator output. bypass with a standard 4.7 f ceramic capacitor to gnd. connect all the pins together externally. 3 fb feedback input. connect fb to the center poi nt of the external resistor divider. the feedback threshold voltage is 0.8v. 4 gnd exposed pad ground. connect exposed pad to gnd plane for optimal thermal performance. 5 en regulator enable control input. drive en abov e 1.5v to turn on the MP20051. drive en below 0.4v to turn it off. do not float the en pin. 6 nc no connection. leave this nc pin open. 7, 8 vin regulator input. supply voltage ranges from 2.5v to 5.5v. bypass with 2.2 f capacitor. these pins must be externally connected for pr oper operation even if they are internally connected.
MP20051 ? low noise high psrr 1a linear regulator MP20051 rev.1.11 www.monolithicpower.com 5 12/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical performanc e characteristics v in = 2.5v, v out = 1.1v, c in =2.2f, c out =4.7f, t a = 25c, unless otherwise noted. quiescent current vs. input voltage i out =0a dropout voltage vs. temperature v out =2.5v, i out =1a en threshold vs. input voltage en threshold vs. temperature dropout voltage vs. output current v out =2.5v current limit vs. input voltage line regulation i out =0ma and 100ma current limit vs. temperature quiescent current vs. temperature i out =0a 0 20 40 60 80 100 120 140 -40 -20 0 20 40 60 80 100 0 20 40 60 80 100 120 140 160 3 3.5 4 4.5 5 5.5 6 input voltage(v) 0 20 40 60 80 100 120 140 160 180 200 -40 -20 0 20 40 60 80 100 dropout voltage(mv) 0 20 40 60 80 100 120 140 160 180 0 200 400 600 800 1000 output current(ma) dropout voltage(mv) 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 2.5 3 3.5 4 4.5 5 5.5 input voltage(v) v en (v) v en (v) 0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 -40 -20 0 20 40 60 80 100 en high threshold en low threshold en high threshold en low threshold 1.5 1.55 1.6 1.65 1.7 1.75 1.8 -40 -20 0 20 40 60 80 100 current limit(a) 1.5 1.55 1.6 1.65 1.7 1.75 1.8 2.5 3 3.5 4 4.5 5 5.5 input voltage(v) current limit(a) -0.3 -0.2 -0.1 0 0.1 0.2 0.3 3 3.5 4 4.5 5 5.5 6 input voltage(v) i out =100ma i out =0ma
MP20051 ? low noise high psrr 1a linear regulator MP20051 rev.1.11 www.monolithicpower.com 6 12/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical performanc e characteristics (continued) v in = 2.5v, v out = 1.1v, c in =2.2f, c out =4.7f, t a = 25c, unless otherwise noted. output voltage accuracy vs. temperature i out =0ma psrr vs. frequency load regulation -0.20 -0.15 -0.10 -0.05 0.00 0.05 0.10 0.15 0.20 0 0.2 0.4 0.6 0.8 1 output current(a) -1.00 -0.80 -0.60 -0.40 -0.20 0.00 0.20 -40 -20 0 20 40 60 80 100 -20 -10 0 10 20 30 40 50 60 70 80 1.e+01 1.e+03 1.e+05 1.e+07 frequency(hz) psrr(db) i out =0.5a i out =0.01a i out =1a
MP20051 ? low noise high psrr 1a linear regulator MP20051 rev.1.11 www.monolithicpower.com 7 12/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical performanc e characteristics (continued) v in = 2.5v, v out = 1.1v, c in =2.2f, c out =4.7f, t a = 25c, unless otherwise noted. v out 500mv/div. v in 1v/div. i out 1a/div. v out 500mv/div. v en 1v/div. i out 1a/div. v out 10mv/div. i out 500ma/div. v out 10mv/div. v in 2v/div. i out 1a/div. v out 500mv/div. v in 1v/div. i out 1a/div. v out 10mv/div. v in 2v/div. i out 1a/div. v out 500mv/div. v in 1v/div. i out 1a/div. v out 500mv/div. v en 1v/div. i out 1a/div. input power start up v in =2.5v, v out =1.1v, i out =1a, with resistor load input power shutdown v in =2.5v, v out =1.1v, i out =1a, with resistor load en start up v en =2.5v, v out =1.1v, i out =1a, with resistor load en shutdown v en =2.5v, v out =1.1v, i out =1a, with resistor load line transient v in =2.5v to 4v, v out =1.1v, i out =10ma, with resistor load line transient v in =2.5v to 4v, v out =1.1v, i out =1a, with resistor load load transient v in =2.5v, v out =1.1v, i out =10ma to 1a, with resistor load over current protection steady state v in =2.5v, v out =1.1v
MP20051 ? low noise high psrr 1a linear regulator MP20051 rev.1.11 www.monolithicpower.com 8 12/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. functional block diagram figure 1?functional block diagram
MP20051 ? low noise high psrr 1a linear regulator MP20051 rev.1.11 www.monolithicpower.com 9 12/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. operation the MP20051 is a low-dropout linear regulator that can supply up to 1a current, which makes it suitable for very low voltage, low quiescent, low noise, and high psrr applications such as wireless lan transceivers, notebook computers, smartphones, and other low-power electronics. the MP20051 uses an internal pmos as the pass element and includes both thermal shutdown and an internal current-limiting circuit. dropout voltage dropout voltage is the minimum input to output differential voltage required for the regulator to maintain an output voltage within 100mv of its nominal value. because the pmos pass element behaves as a low-value resistor, the dropout voltage of MP20051 is only 140mv. shutdown the MP20051 can be switched on or off by a logic input at the en pin: logic high turns the regulator on and logic low turns it off. tie the en pin to vin if the application does not require the shutdown feature. do not float the en pin. current limit the MP20051 includes a current limit structure that monitors and controls the pmos gate voltage to limit the guaranteed maximum output current to 1.6a. thermal protection thermal protection turns off the pmos when the junction temperature exceeds 150c, allowing the ic to cool. when the ic?s junction temperature drops by 20 c, the pmos will turn on again. thermal protection limits total power dissipation in the MP20051. for reliable operation, limit the junction temperature to a maximum of 125c. load-transient considerations the output response of the load-transient consists of a transient response and dc shift? the MP20051?s excellent load regulation effectively limits the dc shift. the output voltage transient depends on the output capacitor?s value and esr. increasing the capacitance and decreasing the esr will improve the transient response.
MP20051 ? low noise high psrr 1a linear regulator MP20051 rev.1.11 www.monolithicpower.com 10 12/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. application information setting the output voltage the MP20051 has an externally-set output voltage with a range of 0.8v to 5v given a 2.5v to 5.5v input. set the output voltage using a resistive voltage divider from the output voltage to the fb pin. the result of the voltage divider at the fb pin is: 2 r 1 r 2 r v v out fb + = where v fb is the feedback threshold voltage (v fb = 0.8v), and v out is the output voltage. thus the output voltage is: r2 r2 r1 8 . 0 v out + = r2 can go as high as 100k ? , but typical applications use 10k ? . after selecting r2, r1 is determined by: ? ? ? ? ? ? ? ? ? = fb fb out v v v 2 r 1 r for example, for a 1.1v output voltage, r2 is 10k ? , and r1 is 3.75k ? . you can select a standard 3.75k ? (1%) resistor for r1. power dissipation the power dissipation for any package depends on the thermal resistance of the case and circuit board, the temperature differential between the junction and ambient air, and the rate of air flow. the power dissipation across the device can be represented by the equation: () out out in i v v p ? = the allowable power dissipation can be calculated using the following equation: ( ) ja ambient junction (max) t t p ? = / where (t junction ? t ambient ) is the temperature differential between the junction and the surrounding environment, ja is the thermal resistance from the junction to the ambient environment. connecting the exposed gnd pad to a large ground pad or plane helps to channel away heat. output capacitor selection the MP20051 is specifically designed to work with a standard ceramic output capacitor to save space and improve performance. use a 4.7f ceramic capacitor for most applications. larger output capacitors will improve load transient response and reduce noise at the cost of increased size.
MP20051 ? low noise high psrr 1a linear regulator MP20051 rev. 1.11 www.monolithicpower.com 11 12/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. package information qfn8 (3 3mm)
MP20051 ? low noise high psrr 1a linear regulator notice: the information in this document is subject to change wi thout notice. users should warra nt and guarantee that third party intellectual property rights are not infringed upon w hen integrating mps products into any application. mps will not assume any legal responsibility for any said applications. MP20051 rev.1.11 www.monolithicpower.com 12 12/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. soic8e see detail "a" 0.0075(0.19) 0.0098(0.25) 0.050(1.27) bsc 0.013(0.33) 0.020(0.51) seating plane 0.000(0.00) 0.006(0.15) 0.051(1.30) 0.067(1.70) top view front view side view bottom view note: 1) control dimension is in inches. dimension in bracket is in millimeters. 2) package length does not include mold flash, protrusions or gate burrs. 3) package width does not include interlead flash or protrusions. 4) lead coplanarity (bottom of leads after forming) shall be 0.004" inches max. 5) drawing conforms to jedec ms-012, variation ba. 6) drawing is not to scale. 0.089(2.26) 0.101(2.56) 0.124(3.15) 0.136(3.45) recommended land pattern 0.213(5.40) 0.063(1.60) 0.050(1.27) 0.024(0.61) 0.103(2.62) 0.138(3.51) 0.150(3.80) 0.157(4.00) pin 1 id 0.189(4.80) 0.197(5.00) 0.228(5.80) 0.244(6.20) 14 85 0.016(0.41) 0.050(1.27) 0 o -8 o detail "a" 0.010(0.25) 0.020(0.50) x 45 o 0.010(0.25) bsc gauge plane

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