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MP2040 fast transient response, 3a dual suppl y very low dropout linear regulator MP2040 rev.1.0 www.monolithicpower.com 1 9/21/2010 mps proprietar y information. un a u t horized photoc op y and duplication prohibited. ? 2010 mps. all rights reserved. the future of analog ic technology descri ption the mp204 0 is a very low dropout, dual supply linear regula t or. the use of two sup p lies a llow s the bias to control a n nmos device. the nmos de vice supplie s power to t he load via the in. in this way the input supply can be just above the d e sired outp u t, yet still provide very good regulation performance due to the higher bias supply. the bias operates fro m a 3.3v to 5.5v input and regulat es the outp u t voltage t o as low as 0. 9v, and as high as 3.3v . the mp204 0 can supply up to 3a of load current with a typical dro pout voltage of 150mv. the bias runs the inte rnal reference and drive circuitry, while the output current comes directly from the in f o r high efficiency regulation. other features of MP2040 inclu de thermal overload and current limit prote c tion, powe r good indica tor, stability with ultra low esr ceramic capacitors as low as 1uf, and fast transient re sponse. th e MP2040 is available in 10-pin qfn (3mm x 3mm), and in qfn (5mm x 5mm) packa ges. features ? wide 1.1v to 5v input voltage range ? stable with very small ceramic ca pacitors ? 150mv dro pout at 3a output ? 2% accurat e output voltage ? adjustable output ran ge of 0.9v to 3.3v ? low noise: 80v rms (10 h z to 100khz) ? very fast transient respo n se ? psrr o 40db at 100khz ? better than 0.001%/ma load regulation ? stable with low-esr output capacitors ? internal the rmal protection ? current limit protection ? 0.1a typical quie scent cur r ent at shutdown ? power good indicator appli c ations ? industrial pr ocess & co ntrol equip m ent ? telecom equipment ? paid storage ? dsp/asi c/ c post reg u lation for switching power supp lies ?mp s ? and ?th e fu ture o f a nal og ic t e chno lo gy ? are r e g i ste r ed t r a dem ar ks o f monolithic pow e r sy st em s , inc. typical application c6 10nf u1 in out out fb en bp in bias pg gnd MP2040 5 3 1 8 9 6 10 7 2 4 vin bias pgood gnd c8 1nf en vout 1.2v/3a http://
MP2040 ?f ast transient response, 3a very low dropout line ar regul a t o r MP2040 rev.1.0 www.monolithicpower.com 2 9/21/2010 mps proprietar y information. un a u t horized photoc op y and duplication prohibited. ? 2010 mps. all rights reserved. ordering information part number package top marking free air temperature (t a ) MP2040dq * 3x3 qfn10 7d -40 c to +85 c MP2040du * * 5x5 qfn32 MP2040du -40 c to +85 c * for tap e & reel, ad d suf f ix ?z (e.g. MP2040 dq? z ). for rohs co mpliant pa ckaging, ad d su ffix ?lf (e.g. MP2040 dq ? l f?z ) ** for ta pe & reel, add su ffix ?z (e.g. MP2040 du?z). for rohs co mpliant pa ckaging, ad d su ffix ?lf (e.g. MP2040 du? l f?z ) package reference top view vin vin bias pgood gnd 1 2 3 4 5 vout vout fb en bypass 10 9 8 7 6 exposed pad on backside t op view 1 2 3 4 5 6 7 8 24 23 22 21 20 19 18 17 n/c vin vin vin vin bias pgood gnd n/c vout vout vout vout fb en byp ass n/c n/c n/c n/c n/c n/c n/c n/c n/c n/c n/c n/c n/c n/c n/c n/c 9101112131415 16 32 31 30 29 28 27 26 25 exposed pad on backside 3x3 qf n10 5x5 qfn32 absolute m a xi mum ratings (1) v bias , v in to gnd ............................. -0.3v to +6v fb, en, to gnd ................................ -0.3v to 6v v out ................................ -0.3v to v in + 0.3 or 6v pgood ...................... -0.3v to v bia s + 0.3 or 6 v bypass ...................... -0.3v to v bia s +0.3 or 6v continuous power dissipation (t a = +25c) (2) qfn10 3 x 3 ................................................ 2.5w qfn32 5 x 5 .............................................. 3.47w junction te mperature ............................... 150 c lead temperature .................................... 260 c storage temperature .............. -65c to +150 c recommended operating conditions (3) input voltag e v in ............................. 1.1v to 5.5v input voltag e v bias .......................... 3.3v to 5.5v output voltage ................................ 0.9v to 3.3v load current ............................... 3.0a maxi mum operating junct. temp (t j ) ...... -40 c to +125 c thermal resistance (4) ja jc qfn10 3 x 3 ? ......................... 50??12 c/ w qfn32 5 x 5 ? ......................... 36?.?8 c/ w notes : 1) exceeding these ratings ma y da m age the device. 2) the ma ximum allowable po w e r dissipation is a fun c tion of the maximum junction temperatu r e t j (max), the junction-to- ambient therm a l resistance ja , a nd the a m bient t e mperatu r e t a . the maximu m allow a ble con t inuous po w e r di ssipation at an y ambient te mperatu r e is ca lculated by p d (max) = (t j (max)-t a )/ ja . exceeding the maximum allowable powe r dissipation w ill cause ex cessive die tempe r ature, and t h e regulator w ill g o into thermal shutdo w n . inte rnal thermal shutdo w n circuitr y pr otects the device from permanent damage. 3) the device is not guarant eed to function outside of its operating conditions. 4) measured on jesd51-7, 4-layer pcb.
MP2040 ?f ast transient response, 3a very low dropout line ar regul a t o r MP2040 rev.1.0 www.monolithicpower.com 3 9/21/2010 mps proprietar y information. un a u t horized photoc op y and duplication prohibited. ? 2010 mps. all rights reserved. electri c al characteristi cs v in = 1.5v, v bi a s = 3.6v, v out = 1.2v, c out = 1f, c in = 0.1f, t a = +2 5 c, unless otherw ise noted. parameter sy mbol conditio n min t y p max units v in operating voltage 1.1 5.5 v v bias operating voltage i out = 2a 3.3 5.5 v v bias operating cu rrent 3.5 ma 0.5 0.51 0.52 fb regul atio n voltage -40 c t a +85 c 0.495 0.51 0.525 v dro pout volta ge i out = 3a, v bi as = 3.6v 150 mv v in line reg u lation i out = 1ma , v in = 1.5 to 5v v bias = 5v v out = 1.2v 1 mv v bias line regulation i out = 1ma , v bias = 3.6v to 5.5v v out = 1.2v v in = 1.5v 2 mv load reg u lat i on i out = 1ma to 1a 0.001 %/ma psrr (v in ) v in > v out + 0.5v, c out = 4. 7 f, v in (ac) = 1 0 0 mv, f = 100khz v b =5v 40 db powe r goo d thre sh old 440 mv powe r goo d delay 80 s cur r e n t limit (5) 3.6 a soft start bypass=open 280 s powe r goo d voltage i sink =230 a 0.39 v en input hig h voltage 1.5 v en input low voltage 0.8 v en input bias current v en = 1.2v ?1 +1 a therm a l prot ection 135 c therm a l prot ection hysteresi s 15 c notes : 5) guaranteed by designer.
MP2040 ?f ast transient response, 3a very low dropout line ar regul a t o r MP2040 rev.1.0 www.monolithicpower.com 4 9/21/2010 mps proprietar y information. un a u t horized photoc op y and duplication prohibited. ? 2010 mps. all rights reserved. pin functio n s qfn3x3 10pins pin # name description 9, 10 vout regulator output. out is the output of the li near regulator, by pass out to gnd with a 4.7f or greater capacitor. 3 bias bias voltage. bypass to ground with a 1f or greater capacitor, vb>=vin. 8 fb feedb ack inp u t. conne ct a resi stive voltage di vide r from out to f b to set the output voltage. out feedback threshold is 0.51v. 7 en enable input. drive en high to turn on the MP2040, drive en low to turn it off. for automatic startup, connect en to in. 5 gnd ground, exposed pad. 1, 2 vin powe r source input. in su pplie s po wer to the load at the output (th r oug h the po wer trans is tor). bypass in to gnd with a 1 f or greater capa citor. 4 pgood open drain output. high indicated v out > 90% final value. 6 bypass connect a 1nf to this pin. do not load this pin resistively. qfn5x5 32pins pin # name description 20, 21,22, 23 vout reg u lator o u tput. out is the output of the li near regulator, by pas s out to gnd with a 4.7f or g r ea ter cap a cito r. 6 bias bias voltage. bypass to ground with a 1f or greater capacitor, vb>=vin. 19 fb feedb ack inp u t. conne ct a resi stive voltage di vide r from out to f b to set the output voltage. out feedback threshold is 0.51v. 18 en enable input. drive en high to turn on the MP2040, drive en low to turn it off. for automatic startup, connect en to in. 8 gnd ground, exposed pad. 2, 3, 4, 5 vin power source input. in supplies power to the load at the output (through the power transistor). bypass in to gnd with a 1f or greater capacitor. 7 pgood open drain output. high indicated v out > 90% final value. 17 bypass connect a 1nf to this pin. do not load this pin resistively. 1, 9, 10, 11, 12, 13, 14, 15, 16, 24, 25, 26, 27, 28, 29, 30, 31, 32 nc these are no connection pins.
MP2040 ?f ast transient response, 3a very low dropout line ar regul a t o r MP2040 rev.1.0 www.monolithicpower.com 5 9/21/2010 mps proprietar y information. un a u t horized photoc op y and duplication prohibited. ? 2010 mps. all rights reserved. typical perfo r manc e characteristics c1=22f, c2=0.1f, c3 =1.0f, c4=4.7f, c6=2 2nf, v b =5v, t a =25oc, u n less otherw i se noted . load regulation line regulation load regulation line regulation 0 20 40 60 80 100 120 140 160 0. 0 0. 8 1. 6 2. 4 3. 2 4. 0 l oad c u r r e n t ( a ) vo l t a g e dro p p e d ( mv ) 0 1.190 1.194 1.198 1.202 1.206 1.210 1.5 1.9 2.3 2.7 3.1 3.5 i nput v o l t age ( v ) o u t p u t v ol t age ( v ) v o lt ag e d r op ou t v out =1.2v lin e r e gu lat i on 1. 190 1. 194 1.198 1. 202 1. 206 1. 210 0. 0 0 . 6 1. 2 1. 8 2. 4 3. 0 l o a d cu r r e n t ( a ) o u t p u t v o l t a g e (v) v in =1.8v v in =1.5v i in =1.0a i in =0.6a lo ad r e gu la t i on -20 -10 0 10 20 30 40 50 60 70 80 0. 1 1 10 100 1000 10000 f r e q ue nc y ( kh z ) p s rr ( d b ) psrr vs. f r e que nc y v in =1.5v ,v out =1.2v 1.790 1.796 1.802 1.808 1.814 1.820 2.0 2.3 2.6 2.9 3.2 3.5 i nput v o l t age ( v ) o u t p u t v ol t age ( v ) o u t p u t v ol t age ( v ) i in =1.0a i in =0.6a 1.800 1.804 1.808 1.812 1.816 1.820 0. 0 0. 6 1. 2 1. 8 2. 4 3. 0 l o a d c u r r e n t ( a ) i nput v ol t age ( v ) l o a d c u r r e n t ( a ) v in =2.5v v in =1.8v output voltage ( v ) o u t p u t v ol t age ( v ) 20 30 40 50 60 70 80 0.5 1.0 1.5 2.0 2.5 3.0 p d (w) ca s e t e m p era t u re ( o c ) mp 2 0 40 du c a s e te m p e r a t u r e vs . p d v b =5v ,v out =1.2v 2.48 2.49 2.50 2.51 2.52 2.53 2.5 2.8 3.1 3.4 3.7 4.0 2.45 2.47 2.49 2.51 2.53 2.55 0.0 0.6 1.2 1.8 2.4 3.0 i in =0.6a i in =1.0a v in =3.5v v in =2.8v v in =3.3v
MP2040 ?f ast transient response, 3a very low dropout line ar regul a t o r MP2040 rev.1.0 www.monolithicpower.com 6 9/21/2010 mps proprietar y information. un a u t horized photoc op y and duplication prohibited. ? 2010 mps. all rights reserved. typical perfo r manc e characteristics (continued) c1=22f, c2=0.1f, c3=1.0f, c4=4.7f, c6=22nf, v b =5v, t a =25oc, unless otherwise noted v dropout vs. temperature v o =1.2v, i o =1a 25 28 31 34 37 40 -45 -25 -5 15 35 55 75 95 v dropout (mv) v out (v) 0.504 0. 506 0. 508 0. 51 0. 512 0. 514 - 40 - 10 20 50 80 110 v bf v ol tage (v ) v bf vs . t e m p e r a t u r e v in =1.5v , v b =3.6v v out v s . tem p er at u r e v in =1.5v , v o =1.5v , i o =1ma 1. 18 1.19 1. 20 1. 21 1. 22 1. 23 -45 -25 -5 15 35 55 75 95 lo ad tr an si en t v in =1.9v , v o =1.2v , i o =0 to 3a en ab le tu rn on v in =1.6v , v o =1.2v , v en =0v to 3v , i o =3a en ab le tu rn off v in =1.6v , v o =1.2v , v en =3v to 0v , i o =3a sho r t ci r c ui t v in =2.1v , v o =1.2v sho rt circuit r e c o v e r y v in =2.1v , v o =1.2v th erm a l p r ot e c t i on v in =3.8v , v o =2.5v , i o =3.6a v o 20mv/div . v o 1v/div . v pg 5v/div . v en 2v/div . i o 2a/div . v o 2v/div . i o 5a/div . v o 2v/div . i o 5a/div . i o 5a/div . v o 1v/div . v pg 5v/div . v en 2v/div . i o 5a/div . v o 2v/div . v pg 5v/div . v in 2v/div . i o 2a/div . 1ms 20ms
MP2040 ?f ast transient response, 3a very low dropout line ar regul a t o r MP2040 rev.1.0 www.monolithicpower.com 7 9/21/2010 mps proprietar y information. un a u t horized photoc op y and duplication prohibited. ? 2010 mps. all rights reserved. typical perfo r manc e characteristics (continued) c1=22f, c2=0.1f, c3=1.0f, c4=4.7f, c6=22nf, v b =5v, t a =25oc, unless otherwise noted lin e t r an sien t v in =1.5v to 4.5v, v o =1.2v, i o =0.4a v o 1v/div . v pg 5v/div . v in 1v/div . i o 2a/div . v o 1v/div . v b 5v/div . v in 1v/div . i o 2a/div . v o 20mv/div . v in 2v/div . 4ms 4ms 4ms p o we r r a m p up v in =1.5v , v o =1.2v , i o =3a with resistor load po w e r r a m p down v in =1.5v , v o =1.2v , i o =3a with resistor load
MP2040 ?f ast transient response, 3a very low dropout line ar regul a t o r MP2040 rev.1.0 www.monolithicpower.com 8 9/21/2010 mps proprietar y information. un a u t horized photoc op y and duplication prohibited. ? 2010 mps. all rights reserved. block diagram byp ass bias en gnd pgood o fb vout vin + -- + -- 0.5v 0.45v reference soft st ar t ga te turns off the gate -- + figure 1?block diagram of lo w dropout re gulator operation MP2040 th eory of ope r ation the mp204 0 linear dropout regulator provid es adjustable o u tput voltages from 0.9v to 3.3v at currents up to 3a. this ldo is prot ected again s t short circuit s , and it has thermal shut down protection w i th 15 o c hystheresis. utilizing t w o pow e r su pplies in order to maxi mize the efficien cy MP2040 uses two power supplie s. one power supply is connected t o the bias pin and it is used to pow er up the internal circuitr ies includ in g band gap reference a nd the rest of control circuitries. th e other power supply is connected to the vin pins which are t he drain of pass device . this powe r supply can be set clo s e to output voltage of ldo. the output pins are the source of the pa ss device. the smaller voltage drop across the pass device tran slates to th e smaller p o wer loss in pass device . thus, the part operates with highe r efficiency. internal current limit the MP2040 has an in ternal curre nt limit set at almost 3.8a. internal current limit is very well controlled o v er process variations and ambient temperature. enable the enable (en) pin is active high. the enable pin has a b u ilt-in hysth e resis. if th is pin is held below 0.8v then part sh uts down and draws less than 1ua from v bias sup p ly. if not used t hen connect this pin to v bias . under voltage lockout the bias voltage is monitored by a circuit that prevents the ldo start up when th e bias voltage is below 2.35v. this circuitry has an approximate hystheresis of 90mv.
MP2040 ?f ast transient response, 3a very low dropout line ar regul a t o r MP2040 rev.1.0 www.monolithicpower.com 9 9/21/2010 mps proprietar y information. un a u t horized photoc op y and duplication prohibited. ? 2010 mps. all rights reserved. soft start MP2040 incorporates in ternal soft start function . this internal function reduces the sta r t up current surge into t he output capacitor. th is allows th e gradual built up of outp u t voltage t o its f i nal set value. the internal soft start cap is held to grou nd if there is a fault condition. the fault condition s are uvlo, thermal shut down, an d disable . t h e internal soft start time is almost 280 pow e r good the power good pin is an open dra i n output an d can be connected to bias voltage via a pull u p resistor. op en drain tra n sistor turn s off and pg pin voltage value becomes v bia s when v fb exceeds 450mv. also pg pin can sink at le a s t 230 a while being low. setting the output voltage the mp204 0 has an a d justable o u tput voltage, set by using a resistive voltage di vider from t he output voltage to fb pin. the voltage divider divides the output voltage down to the feedback voltage by t he ratio: v fb = v out x r 2 / (r 1 +r 2 ) where v fb is the feedback threshold voltage (v fb =0.5v), and v out is the out pu t voltage. r 1 connects between v out and v fb , an d r 2 connects between v fb and ground. thus the out put voltage is: v out = 0.5 x (r 1 +r 2 )/r 2 r 2 can be a s high a s 1 00k ? , but a typical valu e is 10k ? . using that value, r 1 is dete r mined by: r 1 =r 2 x (v ou t -v fb )/v fb for exampl e, for a 1. 8v output voltage, r 2 is 10k ? , and r 1 is 26k ? . you can select 26k ? (1%) resistor for r 1 . pow e r diss ipation most of the power dissipation is d ue to power dissipation in pass device. for examp l e, assum e v bias =5.0v, v in =2.0v, v ou t =1.8v, an d i out =3a: p d ( pass ) = (v in -v out ) x i out p d ( pass ) = (2.0v-1.8v) x 3a=0.6w p bias = v bi as x i gnd = 5v x (220a) = 1.25mw. this is ne gligible compared to p d ( pass ) =0.6w for qfn 3 x 3 ja is 50 o c/ w . 0.6w power is dissipate d when 3a output current goes through pass de vice with v in =2.0v, and v out =1.8v. this g i ves a rise in die temperature for 0.6 x 50 o c/w=30 o cthis is a safe op erating point assuming a junction te mperature of 135 o c a t an 85 o c ambient temperature. a heat sin k needs to be utilized for a bett e r temperature performance.
MP2040 ?f ast transient response, 3a very low dropout line ar regul a t o r MP2040 rev.1.0 www.monolithicpower.com 10 9/21/2010 mps proprietar y information. un a u t horized photoc op y and duplication prohibited. ? 2010 mps. all rights reserved. appli c ation information pg the power good pin is an open d r ain output a pull up resistor (100k ? recommen ded). the p u ll up resistor can be t i ed to a supply within the voltage range of the pin (0 to 5.5v). for example , the pull up resistor can be tied to the inp ut voltage that is monitore d by an ic powered fro m this in put voltage. if th e output vo ltage is 10 % below its re gulation po int, the pg pin become s low. by pass capacitors for lower noise, the re ference voltage can be bypassed by an e x tern al capacitor . a low esr capacitor, such as the ceramic type, will provide the best perf o rmance. it also can f unction as an external soft start, th e soft start tim e; tss=1000 x c bp performanc e transient response for a 3a tra n sient respo n se, suggests increasin g the input capacitance should be increased t o 22f or hig her to get better performance. this will also av oid glitche s on the pg pin due to excessive u ndershoot. also in crea se the inpu t voltage 0.4v above the v out , to i m prove the lo ad transient response. maximum output voltage and load current if the v out is set to 3.3v then t he ma ximu m output current will be decreased to 2.5a. the maxi mum bias voltage limits the v out . v out mus t be at least 2 . 5v less tha n v b ; v out =v b -2. 5 v bias input voltage the bias input is d esigned fo r low drop application . the bias pin must be at least 3.3v, and at least 2.5v higher than the ou tput voltage. if the v in supply voltage meets t hese requirements, the bias p i n can be tie d to v in .
MP2040 ?f ast transient response, 3a very low dropout line ar regul a t o r MP2040 rev.1.0 www.monolithicpower.com 11 9/21/2010 mps proprietar y information. un a u t horized photoc op y and duplication prohibited. ? 2010 mps. all rights reserved. package informati o n qfn10 (3mm x 3mm) side view top view 1 10 6 5 bottom view 2.90 3.10 1.45 1.75 2.90 3.10 2.25 2.55 0.50 bsc 0.18 0.30 0.80 1.00 0.00 0.05 0.20 ref pin 1 id mark ing 1.70 0.50 0.25 recommended land pattern 2.90 note : 1) a l l dimensions ar e in millimeters. 2) exposed paddle size does not include mold flash. 3) l e ad c o pl ana rity sh all be 0.10 mill imeter ma x. 4) d rawing conforms to jed e c mo-229, v a riation veed-5 . 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 r0.20 typ. detail a 0.30 0.50 pin 1 id index area
MP2040 ?f ast transient response, 3a very low dropout line ar regul a t o r notice: t he i n formatio n in this docum ent is subject to chang e w i t h o u t notice. please c ontact m ps for current specifi c ations. users sho u ld w a rrant a nd g u a rante e that thi r d part y inte lle ctual prop ert y rights ar e n o t infring ed u pon w h e n inte grati ng mps prod ucts into a n y app licati on. mps w i ll n o t assume an y l e g a l resp onsi b il ity for an y sa id a pplic atio ns. MP2040 rev.1.0 www.monolithicpower.com 12 9/21/2010 mps proprietar y information. un a u t horized photoc op y and duplication prohibited. ? 2010 mps. all rights reserved. qfn32 (5mm x 5mm)

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