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MP201 dying gasp storage an d release control ic MP201 rev. 1.0 1 www.monolithicpower.com 1 11/27/2012 mps proprietar y information. pate nt protec ted. un authorized photo c op y and d uplication prohibited. ? 2012 mps. all rights reserved. the future of analog ic t echnology descri ption the MP201 is a dying g a sp storage and release controller. i t charges sto r age capacit or from the input during normal operation. once the storage capacitor is charged to the selected voltage, the charge is st opped, and the storage capacitor is separated fr om the input. the charging circuit maintains the storage voltage after the charge is complete d. the MP201 keeps monit o ring the in put voltage, and release s the charg e from stora ge capacitor to input ca pacitor when the input voltage is lower than the select ed release voltage. it regulates th e input voltage to kee p it clo s e t o release volt age for as lo ng as possible. the MP201 has built -in current limit circuit during the charging up of the storage capacitor s. the storag e and re lease volta ge can b e programme d to user ?s d e sired value by external resistors. the MP201 comes in a n soic-8 p a ckage and requires a minimu m number of readily available standard external components. features ? wide 4.5v to 18v input operating range ? 2.5a dumping current fr om storage to vin ? built-in 260 ma current limit for charging storage capacitor ? user programmable storage and release voltage ? dying gasp flag indicator ? available in soic-8 pac kage appli c ations ? cable/dsl/pon mode ms ? home gateway ? access poin t networks a l l m p s p a r t s a r e l e a d - f r e e a n d a d h e r e t o t h e r o h s d i r e c t i v e . for mp s gr een sta t u s , plea se v i sit mps w ebsite under produ cts, quali t y assuran c e page. ?mp s ? and ?th e fu ture o f a nal og ic t e chno lo gy ? are re gi ster ed tr ad ema r ks o f monolithic pow e r sy st em s , inc. typical application m p201 gn d fb 1 bst vin c1 47 ga s p vi n 4. 5v t o 18v vst r g 23v strg vm ax c4 22 nf c3 2. 2 n f c5 10 0 0 7 8 1 3 6 4 2 fb 2 5 r3 464 k r4 c2 15 pf r1 845 k r2 37 . 4 k r5 10 o pen drai n o u tput c onnec t to s w v st orage 5v/div . v in 5v/div . gasp 10v/div . i release 1a/div . http://
MP201 ? dying gasp storage and release cont rol ic MP201 rev. 1.0 1 www.monolithicpower.com 2 11/27/2012 mps proprietar y information. pate nt protec ted. un authorized photo c op y and d uplication prohibited. ? 2012 mps. all rights reserved. ordering information part number* package top marking MP201ds soic-8 MP201 * for tap e & reel, ad d suf f ix ?z (eg.MP201 ds?z); for rohs co mpliant pa ckaging, ad d su ffix ?lf (e.g. MP201 ds?l f?z) package reference bst vin fb2 gnd vmax strg gasp fb1 1 2 3 4 8 7 6 5 t op view soic-8 absolute m a xi mum ratings (1) v in .................................................. -0.3v to 22v v bst . ................................................ -0.3v to 40v v bst -v in ?? ???? ? ???? ?- 0.3v to 25v v max ................................................. -0.3v to 42v v max -v in ? ???? ? ????..... ..-0.3v to 25v v strg ............................................... -0.3v to 32v v strg -v in ? ???? ? ???? ?..-0.3v to 25v v gasp ............................................... -0.3v to 22v all other pins ................................. -0.3v to 6.5v junction te mperature ............................... 150 c lead temperature .................................... 260 c continuous power dissipation (t a = +25c) (2) ........................................................... 1.39w junction te mperature ............................... 150 c recommended operating conditions (3) supply voltage v in ........................... 4.5v to 18v storage voltage v strg ........................................ .................... ............vin t o 2v in -0.8v(32v ma x) operating junction temp. (t j ). -40c to +125c thermal resistance (4) ja jc soic-8 .................................... 90 ...... 45 ... c/w notes : 1) exceeding these ratings ma y da m age 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 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.
MP201 ? dying gasp storage and release cont rol ic MP201 rev. 1.0 1 www.monolithicpower.com 3 11/27/2012 mps proprietar y information. pate nt protec ted. un authorized photo c op y and d uplication prohibited. ? 2012 mps. all rights reserved. electri c al characteristi cs (5) v in = 12v, t a = 25 c, u n less otherw i se noted. parameter sy mbol conditio n min t y p max units input supply voltage ra ng e v in 4.5 18 v supply cu rre nt (quie s cent ) i in v fb = 1.1v 250 300 a vin unde r voltage lo cko u t thre sh old ri sing inuv vt h 2.5 3.0 3.5 v vin unde r voltage lo cko u t thre sh old hy stere s i s inuv hy s 250 mv storage fe ed back voltage v fb1 0.97 1 1.03 v rele ase fee dba ck voltag e v fb2 0.97 1 1.03 v vstora ge refresh thre sh old-hi gh v fb1_h 1.025 1.05 v vstora ge refresh thre sh old-lo w v fb1_l 0.95 0.975 v vstora ge refresh thre sh old-hy stere s i s v fb1_h ys 50 mv feedb ack cu rre nt i fb v fb1 = v fb2 =1v 10 50 na gasp high thres hold (6) vth gasp 1.05 v gasp low thres hold (6) vtl gasp 1 v gasp ris i ng delay time gasp td r 73 s gasp falling delay time gasp td f 0.7 s gasp sink current capability v gasp sink 4ma 0.2 0.3 v gasp leakage current i gasp _lea k v gasp =3.3v 0.01 0.1 ua input inru sh curre n t limit for cha r gi ng storage cap acito r i prec harg e_li m i t v in =12v, ch argin g c st ora ge from 0 to v in 0.2 0.26 0.33 a current limit for dumping cha r ge fr om csto rage to v in i d u mp_ l i mi t 2 2.5 3 a therm a l shut down (7) t sd 150 oc therm a l shut down hysteresi s (7) t hys 30 oc notes : 5) production test a t +25c. specificati ons over the te mperatu r e ran ge are gua ranteed b y design and cha r acterization. 6) this voltage is fb2 voltage. 7) guar anted b y de sign
MP201 ? dying gasp storage and release cont rol ic MP201 rev. 1.0 1 www.monolithicpower.com 4 11/27/2012 mps proprietar y information. pate nt protec ted. un authorized photo c op y and d uplication prohibited. ? 2012 mps. all rights reserved. pin functio n s pin # nam e description 1 bst bootstrap. a capacitor and a resistor in series connected between this pin and dc/dc converter?s sw node is required to charge storage capacitor. 2 vin supply voltage. the MP201 operates from a +4.5v to +18v input rail. input decoupling capacitor is needed to decouple the input rail. 3 fb2 feedback to set release voltage. 4 gnd system gro u nd. this pin i s the refe ren c e grou nd of the reg u lated output voltag e. for this rea s o n care mu st be taken in pcb layout. suggeste d to be con n e c ted to gnd with co pper a nd vias. 5 fb1 feedback to set storage voltage. 6 gasp open drain output to indicate dying gasp operation is active. 7 strg connect to storage capacitor for dy ing gasp storage and release operation. 8 vmax internal supply. a 2.2nf ceramic capacitor is required for decoupling.
MP201 ? dying gasp storage and release cont rol ic MP201 rev. 1.0 1 www.monolithicpower.com 5 11/27/2012 mps proprietar y information. pate nt protec ted. un authorized photo c op y and d uplication prohibited. ? 2012 mps. all rights reserved. typical characteri s tics v in = 12v, v storage = 23v, v release =10.2v, for dcdc converter: p out =5w, v out =3.3v, t a = +25oc, unless otherwise noted. r el ease t i m e vs. s t o r ag e c ap aci t an ce 0 50 100 150 200 250 300 0 500 1000 1500 2000 2500 thermal p e r f or m a nc e 0 2 4 6 8 10 12 0. 0001 0. 001 0. 01 0. 1 1 10 vol t age between strg pin and vin pin (v) i release (a) 0 0. 2 0.4 0. 6 0. 8 1 1. 2 1. 4 1. 6 1. 8 2 2. 2 2. 4 2. 6 2. 8 3 51 0 1 5 2 0 2 5 3 0 safe operation area
MP201 ? dying gasp storage and release cont rol ic MP201 rev. 1.0 1 www.monolithicpower.com 6 11/27/2012 mps proprietar y information. pate nt protec ted. un authorized photo c op y and d uplication prohibited. ? 2012 mps. all rights reserved. typical perfo r manc e characteristics (c ontinued) v in = 12v, v storage = 23v, v release =10.2v, for dcdc converter: p out =5w, v out =3.3v, t a = +25oc, unless otherwise noted. v st orage 5v/div . v in 5v/div . gasp 10v/div . i release 500ma/div . v st orage 5v/div . v in 5v/div . gasp 10v/div . i release 1a/div . v st orage 5v/div . v in 5v/div . gasp 10v/div . i release 1a/div . v st orage 5v/div . v in 5v/div . gasp 10v/div . i release 1a/div . v storage 5v/div. v in 5v/div. gasp 10v/div. i release 1a/div. v st orage 5v/div . v in 5v/div . gasp 10v/div . i release 1a/div . v st orage 5v/div . v in 5v/div . gasp 10v/div . i release 500ma/div . v st orage 5v/div . v in 5v/div . gasp 10v/div . i release 500ma/div . v st orage 5v/div . v in 5v/div . gasp 10v/div . i release 1a/div . v storage charge up v storage refresh v storage release
MP201 ? dying gasp storage and release cont rol ic MP201 rev. 1.0 1 www.monolithicpower.com 7 11/27/2012 mps proprietar y information. pate nt protec ted. un authorized photo c op y and d uplication prohibited. ? 2012 mps. all rights reserved. block diagram logic control vm a x bs t vin fb 2 fb1 v s t o rag e gnd boost /charge / release circuitry gasp figure 1 ? functional block diagram
MP201 ? dying gasp storage and release cont rol ic MP201 rev. 1.0 1 www.monolithicpower.com 8 11/27/2012 mps proprietar y information. pate nt protec ted. un authorized photo c op y and d uplication prohibited. ? 2012 mps. all rights reserved. operation MP201 is a dying ga sp storage and release control ic. it charges the storage capacitor s from input supply during power s t art up and keeps refre s hing the storage voltage at a regulated value during normal operation. MP201 continuously monitors the in put voltage. once the input voltage is lowe r than the programme d release voltage in the case o f losing input power, it releases the charge fro m the storage capacitors t o input, and keeps th e input voltage regulated to the release voltage for as long as possible. it allows th e system to respond to input power failure. start-up during the power start-up, there are two periods to charge the storage capacitors. in the first period, the MP201 pre-charges the large storage cap a citors from 0 to nearly vin with built-in inru sh current limit. once the storage voltage is close to the input voltage, the storage voltage is boosted an d regulated at target voltage. the bst pi n of MP201 should connect to the dcdc switch node. only after the dcdc is enabled, the MP201 will start boostin g . figure 2 shows the charging build-up process of MP201. vin en o f d c /d c o ut put o f d c d c s t o r ag e v o l t ag e vi n p re-charge w/ current limit ta r g et s t o r ag e v ol t age figure 2 ? timing of charging release MP201 keeps monitoring the inp u t voltage. once the in put voltage is lower tha n selected release volt age in the case of losing inp ut power, MP201 moves the charg e from high voltage stor age capacit or to low in put voltage capacitor. the relea s e voltage can be determined by choo sing appro p riate inpu t resistance d i vider. the maxi mum l d o release current can be as high as 2.5 a . until th e storage ca pacitor volt age is nea r the input voltage, the input volta ge loses it s regulation and reduces further. a conceptu al release process of MP201 is shown in figure 3. vr elea s e vs t o rage vi n gasp t i n pu t u v lo o f dc / d c c onv e r te r figure 3 ? timing of releasing gasp indicator when the f b 2 voltage, feedback vo ltage for the input powe r , is h i ghe r than 1.0 5 xv fb2 , the gasp pin will be pulled high. connect a resistor across vin and gasp can drive gasp high. when the f b 2 voltage is lower than 1.00x v fb2 , the gasp voltage will be internally pulled low. gasp volta ge can be u s ed as a communication indicator signal which states in put power availability.
MP201 ? dying gasp storage and release cont rol ic MP201 rev. 1.0 1 www.monolithicpower.com 9 11/27/2012 mps proprietar y information. pate nt protec ted. un authorized photo c op y and d uplication prohibited. ? 2012 mps. all rights reserved. appli c ation information set storage v o lt age the storage voltage c an be set by choosing appropriate external feedback resist ors r1 and r2 which is shown in figure 4. r1 r2 c s t or age st r g fb 1 figure 4 ? feedback circuit for storage voltage the storage voltage is d e termined by: storage fb1 r1 v( 1 ) v r2 =+ here is the exa m ple, if the storage voltage is set to be 20v, choose r2 to be 40k ? , r1 will be then given by: fb 2 fb 2 40 k ( 20 v ) r 1 760 k v ? ? == table 1 list s the reco mmended resistors for different stor age voltages. table 1 ? resistor selection for different storage vol t ages v stor a g e (v) r1 (k ? ) r2 (k ? ) 15 750 53.2 19 750 41.6 23 845 37.4 select release voltage and input capacitors the release voltage can be set by choosing external feedback resistors r3 and r4 which is shown in figure 5. r3 r4 vi n fb 2 ci n cf figure 5 ? release feedback circuit similarly, the release voltage is set by: release fb2 r3 v( 1 ) v r4 =+ however, th e sele ction of r3 and r4 not only determines the release voltage, but impacts the stability. generally, choosing r3 to be 300~500k ? is recom m ended for a stable performance with 47 f cin. table 2 lists th e recommend ed resistor s setup f o r different release volt ages. table 2 ? resistor selection for different release voltages v rele a s e (v) r3 (k ? ) r4 (k ? ) cf (pf) c in ( f) 11 475 47.5 15 47 10.2 464 49.9 15 47 9.0 324 40.2 15 47 select storage capacitor the storage capacitor is for ene rgy storage during normal operation and the en ergy will be released to vin in case of lo sing in put power. typically, a general purpose electro l ytic capacitor is recommend ed. the voltage rating of storage capacit or needs to be higher than the targeted stora ge voltage. the voltage rating of storage capacitor can be fully utilize d since th e voltage on storage capacitor is very stable during normal operation. there will b e less ripp le current/voltage for most of the time during normal operation . the ripple current rating of stor age cap can be less consideratio n. the needed capacitan ce is depend ent on how long the dy ing gasp time based on typically
MP201 ? dying gasp storage and release cont rol ic MP201 rev. 1.0 1 www.monolithicpower.com 10 11/27/2012 mps proprietar y information. pate nt protec ted. un authorized photo c op y and d uplication prohibited. ? 2012 mps. all rights reserved. application. assume the input release current is i release when input voltage is regulated at v release for the dcdc converter. the storage voltage of MP201 is v storage , and the required dying gasp time is t dasp . the necessary storage capacitance can be calculated as following equation: rel e a s e d as p storage release it cs vv = ? if i release =1a, t d =20ms, v st or a ge =20v, v release =10 v , the need ed storage capacitance is 2000 f. generally, the storage capacitan ce should be chosen a little bit lar ge to avoi d capacitan ce reduction at high voltage offset. in typical x d sl applications u s ing a 12v inp u t supply, it is recommended to se t the stora ge voltage higher than 20v to fully utilize the hig h voltage energy and minimize storag e capacitan ce requirements. generally, a 25v rated electr olytic capa citor can b e used. th e lifetime of e l ectrolytic ca pacitors can be severely impacted b y both environmental and electr ical factors. one of the most critical e l ectrical factor s is the ac rms ripp le current through the capacitor w h ich lead s t o increased capacitor co re temperatures. normally, for typical in dustrial use s , it is recommended to derate the cap a citor voltag e rating to 70 %-80%. for example, a 25v rated electrolytic capacitor w ould be use d for a 16v to 20v applicat ion. however, since the MP201 tightly r egulates th e storage voltage, the sto r age capacit or almost has no ac rip p le current going through it. the resulting re f r esh rate of the MP201 is very low which allow s cust omers to safely use a 90 % capacitor d e rating (8) . for example, a 2 5 v electrolytic capacitor, ca n safely han dle a storag e voltage of up to 2 2 v. table 3 is some recommend ed storage electrolytic capacitor s which can b e used in typical xdsl application pcb la y o u t guide pcb la yout is very important to achieve stable operation. please follo w these g u idelines a n d take the evb board layout for references. 1) connect the bst pin as close a s p o ssible to the sw node of dcdc converter through a resistor and a small cer a mic capacitor. try to avoid interconnect the f eedback pat h. 2) ensure all feedback connections are short and direct. place the fe edback resistors and compensation components as clo s e to the chip as po ssible. 3) keep the connectio n of the storage capacitors a nd strg pin as short and wide as possible. table 3 ? recommended storage capacitors part # vender capa citan c e voltage opera t ing t e mp 2 5 m e1 50 0wx sanyo 1500 f 25v -40 to +105 c peh526 hab 4270m 3 kemet 2700 f 25v -40 to +105 c eeufr1e 15 2b panasoni c 1500 f 25v -40 to +105 c notes : 8) ?appl y i ng voltage does not affect t he life time because the se lf heating b y a ppl y i ng v o ltage can be ign o red?, f r om san y o. design example below is a design example f o llowing the application guidelines f o r the specif ications: table 4: des i gn example v in 12v to 18v v s 23v v release 10.2v the detaile d applicat io n schematic is shown in figure 6. t he typical performance and cir c uit waveforms have been shown in the typical performanc e characteristics sect io n. for more device applications, p l e a se refer to the relate d evaluation board datasheets.
MP201 ? dying gasp storage and release cont rol ic MP201 rev. 1.0 1 www.monolithicpower.com 11 11/27/2012 mps proprietar y information. pate nt protec ted. un authorized photo c op y and d uplication prohibited. ? 2012 mps. all rights reserved. typical application circuits MP201 gnd fb 1 bst vi n c1 22 gasp vi n 12 v to 1 8 v vst r g 23v strg vmax c4 22 nf c3 2. 2 n f c5 10 0 0 fb2 r3 464 k r4 49. 9k c2 15 pf r1 845 k r2 37. 4k r5 10 r5 10 k vi n vout sw m ps dc / d c conver t e r figure 6 ? MP201 app lication circuit
MP201 ? dying gasp storage and release cont rol ic notice: t he i n formatio n in this docum ent i s subject to chang e w i t h o u t notice. users sh oul d w a rra nt and gu arante e that third part y int e ll ectu al prop ert y r i g h ts are n o t inf r ing ed u p o n w hen i n tegr atin g mps product s into an y ap p licatio n. mps w i ll not assume a n y le gal res pons ib ili t y for an y sai d app licati ons. MP201 rev. 1.0 1 www.monolithicpower.com 12 11/27/2012 mps proprietar y information. pate nt protec ted. un authorized photo c op y and d uplication prohibited. ? 2012 mps. all rights reserved. package informati o n soic8 0. 0 1 6( 0. 41 ) 0.050(1.27) 0 o -8 o detail "a" 0 . 01 0 ( 0. 2 5 ) 0.020(0.50) x 45 o see detail "a" 0. 0 0 7 5( 0. 1 9) 0.0 0 9 8( 0. 2 5) 0 .150(3.80) 0.157(4.00) pin 1 id 0.050(1.27) bsc 0 . 01 3(0 . 3 3 ) 0 . 02 0(0 . 5 1 ) seating plane 0.004(0.10) 0.010(0.25) 0 . 189 ( 4. 8 0) 0 . 197 ( 5. 0 0) 0 . 053 ( 1. 35) 0 . 069 ( 1. 75) to p vi ew fro nt view 0. 228 ( 5 . 80 ) 0. 2 4 4 ( 6 . 20 ) s i de vi ew 14 85 re co m m ended land p at tern 0.213( 5. 4 0 ) 0.063( 1.6 0 ) 0.050(1.27) 0 . 024( 0.6 1 ) note: 1) co ntr o l di men s ion i s in inch es . di me ns i o n in brac ke t i s i n millimeter s . 2 ) p a cka ge le ngth doe s not i n clud e mold flas h, protr u si ons or ga te b urr s . 3 ) p a cka ge wid t h does not inclu d e i n te r l e a d flas h o r p r o t r u s io n s . 4 ) lea d cop l a nar i t y ( b ottom of l e a d s afte r form ing ) sha ll be 0 . 0 0 4 " inche s max . 5 ) d r a w in g conf orms to j ede c m s - 0 1 2 , varia t ion a a . 6 ) d ra w in g i s not to s cale . 0.0 1 0 ( 0.25 ) bsc gauge pla n e

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