MP20048 capacitor-free, 250ma, low dropout voltage regulator MP20048 rev. 0.91 www.monolithicpower.com 1 4/6/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. the future of analog ic technology description the MP20048 is a kind of new low-dropout (ldo) voltage regulators which uses an nmos as the pass element in a voltage-follower configuration. it can get any value of output from 1.234v to 5v. the benefit of this product is that it can operate without any capacitors. the MP20048 uses an advanced bicmos process to yield high precision. it also delivers very low dropout voltage and low ground pin current. it integrates the thermal-off and current limit block to protect the devices from damage. the MP20048 is available in a tsot23-5 package. features ? stable with no output capacitor or any capacitors ? input voltage range: 1.7v to 5.5v ? output voltage range:1.234v to 5v ? 62.5mv dropout at 250ma load ? 1% accuracy for initial reference ? thermal off and current limit protection ? available in a tsot23-5 package applications ? vcos ? portable/battery-powered equipment ? post-regulation for switching supplies ? point of load regulation for dsps, fpgas, asics, and microprocessors ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application in en out fb gnd vin c1 r1 r2 vout MP20048 typical application circuit in en ( optional ) ( optional ) out fb gnd vin c1 r1 r2 c3 c2 vout MP20048 typical application circuit with optional output cap and feedforward cap
MP20048 ? capacitor-free, 250ma, low dropout voltage regulator MP20048 rev. 0.91 www.monolithicpower.com 2 4/6/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. ordering information part number* package top marking free air temperature (t a ) MP20048dj tsot23-5 3b ?40 c to +85 c *for tape & reel, add suffix ?z (eg. MP20048dj-z) for lead free, add suffix ?lf (eg.MP20048dj?lf?z) package reference in gnd en out fb absolute maxi mum ratings (1) supply input voltage .................................... 6v power dissipation, p d @ t a =25c (2) ................................................................. 0.45w operating junct. temp (t j ) ....... -40c to 125c storage temperature range ..... -65c to 150c lead temperature (soldering, 10sec) .....260c esd susceptibility (3) hbm (human body mode) .......................... 2kv mm (machine mode) .................................. 500v recommended operating conditions (4) supply input voltage.......................1.7v to 5.5v enable input voltage .........................0v to 5.5v junction temperature ............................+125 c thermal resistance (5) ja jc tsot23-5.............................. 220 .... 110. . c/w notes: 1) exceeding these ratings may cause permanent damage to 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) devices are esd sensitive. handling precaution recommended. 4) the device is not guaranteed to function outside its operating conditions. 5) measured on jesd51-7 4-layer board.
MP20048 ? capacitor-free, 250ma, low dropout voltage regulator MP20048 rev. 0.91 www.monolithicpower.com 3 4/6/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. electrical characteristics (6) v in = v out(nom) +0.5v (6) , v out =2.5v, v en =1.7v, c 2 =0.1 f, t a = 25 c, unless otherwise noted. parameters test condition min typ max unit v in input voltage range (6) 1.7 5.5 v internal reference 1.221 1.234 1.247 v v fb accuracy t a =25 -1.0 +1.0 % v out output voltage range (7) v fb 5.5- z o (do)* i out v v out %/ v i n line regulation (8) 1.7v v in 5.5v 0.01 %/v v out %/ i o ut load regulation (9) 1ma i out 250ma 0.0005 %/ma v do dropout voltage (10) i out =250ma 62.5 mv z o (do) output impedance in dropout 1.7v v in 5.5v 0.25 ? i cl output current limit v out =0.9v out(nom) 270 450 ma i sc short-circuit current v out =0v 430 ma i out =10ma 350 a i gnd ground pin current i out =100ma 500 800 a i shdn shutdown current (i gnd ) v en 0.5v,v out v in 5.5v 0.01 1 a i leak output leakage v en 0.5v,v out v in 5.5v -40 t j +125 6.5 a f=100hz 48 psrr power-supply rejection ratio (ripple rejection) i out =250ma f=10khz 23 db c 2 =10 f,no c 3 48 vn output noise voltage bw=10hz?100khz c 2 =10 f, c 3 =0.01 f 37 v rms t str startup time v out =2.5v, r l =25 ? ,c 2 =1 f 0.5 ms v en (hi) enable high (enabled) 1.7 v in v v en (lo) enable low (shutdown) 0 0.5 v shutdown temp increasing +140 t sd thermal shutdown temperature reset temp decreasing +130 t j operating junction temperature 125 notes: 6) minimum v in =v out +v do or 1.7v 7) this version is tested at v out =2.5v 8) 100(%/v) v ] v [v v v regulation line out(nom) in(min) in(max) ] out[v ] out[v in(min) in(max) ? ? = 9) 100(%) v v v regulation load out(nom) ] out[i ] out[i out(min) out(max) ? = 10) dropout voltage is defined as the input to output different ial when the output voltage drops 100mv below its nominal value .
MP20048 ? capacitor-free, 250ma, low dropout voltage regulator MP20048 rev. 0.91 www.monolithicpower.com 4 4/6/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. pin functions package pin # name description 1 in regulator input. supply voltage ranges from +1.7v to 5.5v. 2 gnd ground 3 en positive polarity enable(en) input 4 fb feedback voltage for setting output voltage of the device. 5 out regulator output. it can be stable without output capacitor
MP20048 ? capacitor-free, 250ma, low dropout voltage regulator MP20048 rev. 0.91 www.monolithicpower.com 5 4/6/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. typical performanc e characteristics v in =3v, v out =2.5v, v en =1.7v,c 1 =1uf,c 2 =0.1uf, no c 3 ,t a =25 o c, unless otherwise noted 300 350 400 450 500 550 600 650 -40 -20 0 20 40 60 80 100 temperature( o c) temperature( o c) temperature( o c) temperature( o c) gr ound pin cur r ent(ua) i out =10ma i out =250ma ground pin current vs. temperature 0 100 200 300 400 500 600 700 0 50 100 150 200 250 gr ound pin cur r ent(ua) ground pin current vs. output current 0 10 20 30 40 50 60 70 80 -40 -20 0 20 40 60 80 100 dropout voltage(mv) dropout voltage vs. temperature i out =250ma 0 10 20 30 40 50 60 70 0 50 100 150 200 250 dr opout vol tage (mv) dropout voltage vs. output current 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.5 2 2.5 3 3.5 4 4.5 5 5.5 input voltage(v) output current(ma) output current(ma) v en (v) v en (v) en threshold vs. input voltage en low threshold en high threshold 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 -40 -20 0 20 40 60 80 100 en threshold vs. temperature v out =1.25v v in =1.7v 0 100 200 300 400 500 600 -40 -20 0 20 40 60 80 100 current limit(ma) current limit vs. temperature 0 100 200 300 400 500 600 3 3.5 4 4.5 5 5.5 current limit(ma) current limit vs. input voltage -0.20 -0.15 -0.10 -0.05 0.00 0.05 0.10 0.15 0.20 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input voltage(v) input voltage(v) output voltage accuracy(%) line regulation i out =10ma en high threshold en low threshold v in =5.5v
MP20048 ? capacitor-free, 250ma, low dropout voltage regulator MP20048 rev. 0.91 www.monolithicpower.com 6 4/6/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. typical performanc e characteristics (continued) v in =3v, v out =2.5v, v en =1.7v, c 1 =1uf,c 2 =0.1uf, no c 3 ,t a =25 o c, unless otherwise noted. -0.4 -0.3 -0.2 -0.1 0.0 0.1 0.2 0 50 100 150 200 250 output current(ma) output voltage accuracy(%) load regulation -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 output voltage accuracy(%) temperature( o c) output voltage accuracy vs. temperature -20 0 20 40 60 80 100 10 10 2 10 3 10 4 10 5 10 6 10 7 frequency(hz) psrr(db) psrr
MP20048 ? capacitor-free, 250ma, low dropout voltage regulator MP20048 rev. 0.91 www.monolithicpower.com 7 4/6/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. typical performanc e characteristics (continued) v in =3v, v out =2.5v, v en =1.7v, c 1 =1uf,c 2 =0.1uf, no c 3 ,t a =25 o c, unless otherwise noted. v in 1v/div. v out 1v/div. i out 200ma/div. v in 1v/div. v out 1v/div. i out 200ma/div. v in 2v/div. v out 2v/div. i out 200ma/div. v in 2v/div. v out 2v/div. i out 200ma/div. v in 1v/div. v out 1v/div. i out 200ma/div. v en 1v/div. v out 1v/div. i out 200ma/div. v en 1v/div. v out 2v/div. v in 1v/div. v out/ac 100mv/div. i out 200ma/div. v out/ac 500mv/div. i out 200ma/div. 2ms/div. 2ms/div. 40us/div. 2us/div. mp####-tpc## 200us/div. 40us/div. 1s/div. 40ms/div. 200ms/div. input power start up with resistive load i out =250ma en start up with resistive load i out =250ma en shut down with resistive load i out =250ma input power shut down with resistive load i out =250ma line transient with resistive load v in =3.5v-4.5v, v out =2.50v, c 1 =0, i out =250ma load transient with resistive load i out =10ma-250ma over current protection entry over current protection steady state over current protection recovery
MP20048 ? capacitor-free, 250ma, low dropout voltage regulator MP20048 rev. 0.91 www.monolithicpower.com 8 4/6/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. block diagram bandgap + + ref charge pump thermal protection current limit error amp error amp gnd en in out 4k fb figure1?functional block diagram operation the MP20048 is a kind of new low-dropout (ldo) voltage regulators which uses an nmos as the pass element in a voltage-follower configuration. the highlight of this topology is the stability even without outside capacitor. it can get any value of output between 1.234v to 5v. the MP20048 uses an advanced bicmos process to yield high precision. it also delivers very low dropout voltages and low ground pin current and features the thermal-off and current limit block to protect the devices from damage. 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 nmos pass element behaves as a low-value resistor, the dropout voltage of MP20048 is very low. enable pin and shutdown the MP20048 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 v in 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 MP20048 includes a current limit structure which monitors and controls nmos?s gate voltage to limit the guaranteed maximum output current to 450ma. thermal protection thermal protection turns off the nmos when the junction temperature exceeds +140oc, allowing the ic to cool. when the ic?s junction temperature drops by 10oc, the nmos will be turned on again. thermal protection limits total power dissipation in the MP20048. for reliable operation, junction temperature should be limited to 125 oc maximum.
MP20048 ? capacitor-free, 250ma, low dropout voltage regulator MP20048 rev. 0.91 www.monolithicpower.com 9 4/6/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. application information setting the output voltage the output voltage of MP20048 can get any value of output between 1.234v to 5v. 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 = 1.234v), and v out is the output voltage. thus the output voltage is: r2 r2 r1 1.234 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 2.5v output voltage, r2 is 10k ? , and r1 is 10.2k ? . you can select a standard 10.2k ? (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. output capacitor selection the MP20048 does not require the output capacitor for stable operation. it is specifically designed to be stable with any type and value capacitor including ceramic and electrolytic. although an output capacitor is not required for stability, the output capacitor, c2, is optional to be connected at the output side. (figure 2) output capacitor of larger values will help to improve load transient response and reduce output noise with the drawback of increasing size. output noise a precision bandgap reference is used to generate the internal reference voltage, vref, which is the dominant noise source within the MP20048. it is optional to connect a feed forward capacitor, c3, from the output to feedback to improve load transient performance. this capacitor, c3, should be limited to be less than 0.1uf. (figure 2) in en ( optional ) ( optional ) out fb gnd vin c1 r1 r2 c3 c2 vout MP20048 figure2. typical application circuit with optional output cap and feedforward cap
MP20048 ? capacitor-free, 250ma, low dropout voltage 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. MP20048 rev. 0.91 www.monolithicpower.com 10 4/6/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 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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