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mp20045 low noise, 1a linear regulator mp20045 rev. 1.0 www.monolithicpower.com 1 10/13/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. the future of analog ic technology description the mp20045 is a low-dropout linear regulator supplies up to 1a current with 140mv dropout voltage. the output voltage is set externally which ranges from 1.5v to 5v by operating from +2.5v to +5.5v input or can be preset internally from 1.5v to 5v. an internal pmos pass element is used to allow a low 110a ground current, making the mp20045 suitable for battery-power devices. other features include low-power shutdown, short-circuit and thermal protection. the mp20045 is available in 8-pin qfn (3mm x 3mm) and soic8e packages. features ? up to 1a output current ? low 140mv dropout at 1a ? low 110a ground current ? fixed output versions ranging from 1.5v to 5v and adjustable versions ? open drain power-good status output ? 13v rms low noise output ? 56db psrr at 1khz ? current limiting and thermal protection ? 3mm3mm qfn8 and soic8e packages applications ? notebook computers ? cordless telephones ? cellular phones ? modems ? hand-held instruments ? pda and palmtop computers ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application mp20045 c out 2.2 vout vin en fb r3 100k c in pg mp20045 r1 r2 c out 2.2 c3(optional) 0.1nf vout vin en fb r3 100k c in pg 1 out 2 v = (1+ )volts r 1.5 r fixed version adjustable version
mp20045 ? lower noise, 1a linear regulator mp20045 rev. 1.0 www.monolithicpower.com 2 10/13/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. ordering information part number* output voltage package top marking free air temperature (t a ) mp20045dq ** adjustable qfn8 (3mm x 3mm) 8k mp20045dq-15 ** 1.5v qfn8 (3mm x 3mm) 2v mp20045dq-18 ** 1.8v qfn8 (3mm x 3mm) 3v mp20045dq-25 ** 2.5v qfn8 (3mm x 3mm) 9z MP20045DQ-33 ** 3.3v qfn8 (3mm x 3mm) 2s mp20045dn ** adjustable soic8e m20045dn mp20045dn-15 ** 1.5v soic8e 20045-15 mp20045dn-18 ** 1.8v soic8e 20045-18 mp20045dn-25 ** 2.5v soic8e 20045-25 mp20045dn-33 ** 3.3v soic8e 20045-33 -40 c to +85 c * for fixed output voltage versions between 1.5v and 5v, add suffix ?xx (e.g. MP20045DQ-33, mp20045dn-33 are the 3.3v fixed output). cont act factory for availability. ** for tape & reel, add suffix ?z (e.g. mp20045dq?z, mp20045dn?z); for rohs compliant packaging, add suffix ?lf (e.g. mp20045dq?lf?z, mp20045dn?lf?z). package reference top view vin vin vout vout 1 2 3 4 en pg gnd fb 8 7 6 5 vout vout fb gnd vin vin en pg 1 2 3 4 8 7 6 5 top view exposed pad on backside connect to gnd qfn8 (3mm x 3mm) soic8e
mp20045 ? lower noise, 1a linear regulator mp20045 rev. 1.0 www.monolithicpower.com 3 10/13/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. absolute maxi mum ratings (1) vin, en, pg, fb to gnd ................-0.3v to +6v out to gnd .........................-0.5v to v in + 0.5v continuous power dissipation (t a =+25 c) (2) qfn8 (3x3) ......................................................2.0w soic8e ............................................................2.0w free air temperature (t a ).............. -40c to 85c storage temperature range ..... -65c to 150c lead temperature (soldering, 10sec)........... 260c esd susceptibility hbm (human body mode)........................... 2kv mm (machine mode) .................................. 200v recommended operating conditions (3) supply input voltage.......................2.5v to 5.5v enable input voltage .........................0v to 5.5v operating junct. temp (t j )...... -40 c to +125 c thermal resistance (4) ja jc qfn8 (3x3) .............................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 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 board.
mp20045 ? lower noise, 1a linear regulator mp20045 rev. 1.0 www.monolithicpower.com 4 10/13/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 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 2.0 2.3 v hysteresis of uvlo 160 mv fb accuracy adjustable i out =1ma -2.5 2.5 1.5v i out =1ma, 2.5v=3v 1 a short-circuit current limit v out =0, v in >=3v 1.6 a in-regulation current limit v out within 4% of normal output voltage v in =5.5v 1.4 2.2 3.0 a ground current i out =100a 110 a dropout voltage (5) i out =1a 140 280 mv line regulation (6) v in from v out +0.5v to 5.5v, i out =5ma -0.15 0.15 %/v load regulation (7) i out from 1ma to 1a -0.3 % output voltage noise v in =3.3v, v out =2.8v, c out =2.2f, i out =100ma, f ranges from 10hz to 100khz 13 v rms psrr at 1khz, i out =250ma 56 db shutdown supply current v in =+5.5v 5 16 a en logic high 1.5 en pin threshold en logic low 0.4 v en pin pull-up resistor 550k 1.1m ? thermal shutdown temperature typical thermal hysteresis =20c 150 c minimum input voltage i out(pg) =300a 1.1 1.3 v trip threshold voltage mp20045 mp20045-15 mp20045-18 mp20045-25 80 86 v out decreasing mp20045-33 77 83 %v out hysteresis voltage measured at v out 6 %v out output low voltage i out(pg) =1ma 0.15 0.4 v pg leakage current v (pg) =5.5v 1 a notes: 5) dropout voltage is defined as the input to output different ial when the output voltage drops 100mv below its nominal value. 6) line regulation= () in(max ) in(min) out v out v in(min) out(nom) in max vv 100(% / v) vv v ?? ?? ?? ?? ? ?? ? ?? 7) load regulation= () out(max ) out(min) outi outi out nom vv 100(%) v ?? ?? ?? ?? ?
mp20045 ? lower noise, 1a linear regulator mp20045 rev. 1.0 www.monolithicpower.com 5 10/13/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. pin description qfn8 (3x3) pin # soic8e pin # name description 1, 2 7, 8 vin regulator input. supply voltage ranges from +2.5v to 5.5v. bypass with 2.2f capacitor. these pins must be externally connected for proper operation even if they are internally connected. 3, 4 1, 2 vout regulator output. bypass with a 2. 2f low-esr capacitor to gnd. connect all the pin together externally. 5 3 fb feedback input. for the adjustable output version, conn ect fb to the center point of the external resistor divider. the feedback threshold voltage is 1.5v. for the fixed output version, conn ect fb to the output directly. 6 4 gnd expose d pad ground. connect exposed pad to gnd plane for optimal thermal performance. 7 5 pg open-drain power-good (pg) output. 8 6 en positive polarity enable (en) input. regulator enable control input. drive en above 1.5v to turn on the mp20045. dr ive en below 0.4v to turn it off. do not float the en pin.
mp20045 ? lower noise, 1a linear regulator mp20045 rev. 1.0 www.monolithicpower.com 6 10/13/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. typical performanc e characteristics v in =3.3v, v out =2.8v, c in =c out =2.2f, t a =25c, unless otherwise noted quiescent current vs. temperature 0 20 40 60 80 100 120 -40 -20 0 20 40 60 80 100 quiescent current vs. input voltage 0 20 40 60 80 100 120 3 3.5 4 4.5 5 5.5 quiescent current(ua) dropout voltage vs. temperature 0 20 40 60 80 100 120 140 160 180 -40-20 0 20406080100 dr opout v ol t a g e (mv ) i out =1a dropout voltage vs. output current 0 20 40 60 80 100 120 140 160 0 200 400 600 800 1000 en threshold vs. input voltage 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 3 3.5 4 4.5 5 5.5 input voltage(v) input voltage(v) v en (v) en high threshold en low threshold en threshold vs. temperature 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 -40 -20 0 20 40 60 80 100 v en (v) en high threshold en low threshold current limit vs. temperature 0 0.5 1 1.5 2 2.5 -40 -20 0 20 40 60 80 100 current limit(a) input voltage (v) current limit vs. input voltage 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 current limit(a) input voltage (v) line regulation -0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 3.0 3.5 4.0 4.5 5.0 5.5 output voltage accuracy(%) i out =0a i out =0.5a
mp20045 ? lower noise, 1a linear regulator mp20045 rev. 1.0 www.monolithicpower.com 7 10/13/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. typical performance characteristics ( continued ) v in =3.3v, v out =2.8v, c in =c out =2.2f, t a =25c, unless otherwise noted load regulation -0.06 -0.04 -0.02 0.00 0.02 0.04 0.06 0 200 400 600 800 1000 output current (ma) output voltage accuracy vs. temperature i out =250ma, -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 -40 -20 0 20 40 60 80 100 10 10 3 10 5 frequency (hz) psrr (db) region of stable c out esr vs. output current 0.1 1 10 100 0 200 400 600 800 1000 output current (ma) stable range unstable range 10 2 10 4 10 6 i out =1a 0 10 20 30 40 50 60 70 80 90 100 psrr vs. frequency i out =800ma, f ranges from 10hz to 1mhz
mp20045 ? lower noise, 1a linear regulator mp20045 rev. 1.0 www.monolithicpower.com 8 10/13/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. typical performance characteristics ( continued ) v in =3.3v, v out =2.8v, c in =c out =2.2f, t a =25c, unless otherwise noted 400us/div 100us/div line transient v in =3.3v to 4.3v, i out =100ma, with resistor load line transient v in =3.3v to 4.3v, i out =1a, with resistor load load transient i out =50ma to 1a, with resistor load 40us/div 4us/div 400us/div 400ms/div over current protection entry v in 1v/div i out 500ma/div i out 500ma/div v out 1v/div v en 5v/div i out 500ma/div v out 1v/div v out (ac) 10mv/div v out (ac) 10mv/div v out (ac) 50mv/div v in 1v/div v en 5v/div v out 2v/div v in 2v/div i out 500ma/div i out 500ma/div v out 2v/div v in 2v/div i out 500ma/div v out 2v/div v in 2v/div input power start up i out =1a, with resistor load en start up i out =1a, with resistor load en shutdown i out =1a, with resistor load input power shutdown i out =1a, with resistor load 2ms/div 100ms/div v out 500mv/div pg 1v/div 40us/div power good status
mp20045 ? lower noise, 1a linear regulator mp20045 rev. 1.0 www.monolithicpower.com 9 10/13/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. typical performance characteristics ( continued ) v in =3.3v, v out =2.8v, c in =c out =2.2f, t a =25c, unless otherwise noted i out 500ma/div v out 2v/div v in 2v/div i out 500ma/div v out 2v/div v in 2v/div over current protection steady state over current protection recovery 20ms/div 40ms/div i out 500ma/div current limit 4ms/div no load no load
mp20045 ? lower noise, 1a linear regulator mp20045 rev. 1.0 www.monolithicpower.com 10 10/13/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. block diagra figure 1?block diagram of super low dropout regulation operation the mp20045 is a low-dropout linear regulator supplies up to 1a current. it is intended for use in devices that require very low voltage, low quiescent, low noise and high psrr such as wireless lan, battery powered equipment and hand-held equipment. the mp20045 uses an internal pmos as the pass element and features internal thermal shutdown and internal current limit 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 mp20045 is very low. shutdown the mp20045 can be switched on or off by a logic input at the en pin. a high voltage at this pin will turn the device on. when the en pin is low, the regulator output is off. the en pin should be tied to vin to keep the regulator output always on if the application does not require the shutdown feature. do not float the en pin. current limit the mp20045 includes a current limit structures which monitor and control pmos?s gate voltage limiting the guaranteed maximum output current to 1.2a. thermal protection thermal protection turns off the pmos when the junction temperature exceeds +150oc, allowing the ic to cool. when the ic?s junction temperature drops by 20oc, the pmos will be turned on again. thermal protection limits total power dissipation in the mp20045. for reliable operation, junction temperature should be limited to 125 oc maximum. load-transient considerations the output response of load-transient consists of a dc shift and transient response. because of the excellent load regulation of mp20045, the dc shift is very small. the output voltage transient depends on the output capacitor?s value and the esr. increasing the capacitance and decreasing the esr will improve the transient response.
mp20045 ? lower noise, 1a linear regulator mp20045 rev. 1.0 www.monolithicpower.com 11 10/13/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. application information setting the output voltage the output voltage of mp20045 can be set externally which ranges from 1.5v to 5v by operating from +2.5v to +5.5v input or preset internally at 1.5v, 1.8v, 2.5v, 3.3v, 5v. for the adjustable version, the output voltage is set by using a resistive voltage divider from the output voltage to fb pin. the voltage divider divides the output voltage down to the feedback voltage by the ratio: 2 r 1 r 2 r v v out fb + = where v fb is the feedback threshold voltage (v fb = 1.5v), and v out is the output voltage. thus the output voltage is: r2 r2 r1 1.5 v out + = r2 can be as high as 100k ? , but a typical value is 10k ? . using that value, r1 is determined by: ? ? ? ? ? ? ? ? ? = fb fb out v v v 2 r 1 r for example, for a 2.8v output voltage, r2 is 10k ? , and r1 is 8.66k ? . you can select a standard 8.66k ? (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 difference 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 difference between the junction and the surrounding environment, ja is the thermal resistance from the junction to the ambient environment. connecting the gnd pin of mp20045 to ground using a large pad or ground plane helps to channel heat away. output capacitor selection the mp20045 is designed specifically to work with very low esr ceramic output capacitor in space-saving and performance consideration. a 2.2 f ceramic capacitor with esr lower than 0.9 ? is suitable for the mp20045 application circuit. output capacitor of larger values will help to improve load transient response and reduce noise with the drawback of increased size. 0.1 1 10 100 0 100 200 300 400 500 600 700 800 900 1000 output current(ma) c out esr( ? ) figure 2?relationship between esr and ldo stability
mp20045 ? lower noise, 1a linear regulator mp20045 rev. 1.0 www.monolithicpower.com 12 10/13/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. package information 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
mp20045 ? lower noise, 1a linear regulator notice: the information in this document is subject to change wi thout notice. please contact m ps for current specifications. users should warrant and guarantee that third party intellectual property rights ar e not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. mp20045 rev. 1.0 www.monolithicpower.com 13 10/13/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. qfn8 (3mm3mm) side view top view 1 8 5 4 bottom view 2.90 3.10 1.45 1.75 2.90 3.10 2.25 2.55 0.65 bsc 0.20 0.30 0.80 1.00 0.00 0.05 0.20 ref pin 1 id marking 1.70 0.65 0.25 recommended land pattern 2.90 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 veec-2. 5) drawing is not to scale. pin 1 id see detail a 2.50 0.70 pin 1 id option b r0.20 typ. pin 1 id option a 0.30x45 o typ. detail a 0.30 0.50 pin 1 id index area

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