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MP26121 28v, 1a li + linear battery charger with 10 % battery - full threshold and flexible ntc interface MP26121 rev. 0 . 9 www.monolithicpower.com 1 9/15/2008 mps proprietar y information. un a u t horized photoc op y and duplication prohibited. ? 2008 mps. all rights reserved. the future of analog ic t echnology descri ption the mp261 21 is a lin ear, high-p e rformance single cell li-ion/li-polymer battery charger. by integrating h i gh voltage input protection into the charger ic, the mp2612 1 can tolera te an inpu t surge up to +28v. the device features co nstant curre nt (cc) and constant voltage (cv) charging modes with programma ble charge currents (20 0 ma to 1a), current blocking, and trickle charge. the device also provides fault and ch arge statu s indication s t o the system. for guaranteed safe operation, th e MP26121 reduces charge curr ent when the device reaches hig h temperature (due to limited pcb space). oth e r safety f eatures in clude battery temperature monitoring and programmable timer to complete the ch arging cycle . the mp261 21 is available in 10- pin 3mm x 3mm qfn p a ckages. features ? interfaces to many ntc resistor values ? proprietary v in surge protection up t o 28v ? programma ble charge current up to 1a ? 1% voltage accuracy ? 10% battery-full thresh o ld ? no reverse blocking dio de required ? intelligent t hermal man agement ? trickle char ge ? 7v i npu t ovp ? auto recha r ge ? charge-timer ? fault and charge status indicator s appli c ations ? cell phones ? digital cameras ? smart phon es ? pdas ? mp3 pla y ers ?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
MP26121 ? +28v, 1a li+ linear batt ch arger w i th flexible ntc interface MP26121 rev. 0 . 9 www.monolithicpower.com 2 9/15/2008 mps proprietar y information. un a u t horized photoc op y and duplication prohibited. package reference 1 2 3 4 5 10 9 8 7 6 part numb er * packag e tempera t ure mp2612 1dq qfn10 (3mm x 3mm ) ?40 c to + 8 5 c * for t ape & re el, add suffix ?z (e. g . MP26121d q? z) for ro hs compliant packaging, add suffix ?lf (e.g. mp2612 1d q?lf ?z) absolute m a xi mum ratings (1) in to gnd ....................................... ?5v to +28v ac ok and chg ma xi mu m sink curre n t ........ 20 ma all other pins to gnd .................. -0.3v to +6.5v junction te mperature ............................... 140 c lead temperature .................................... 260 c storage temperature .............. ?65c to +150 c recommended operating conditions (2) nominal su pply voltage v in ............ 3.5v to 6.5v operating temperature ............. ?40 c to +85 c thermal resistance (3) ja jc 3x3 qfn10 ............................. 50 ...... 12... c/w notes : 1) exceeding these ratings ma y da m age the device. 2) the device is not guarante ed to fu nction outside of its operating conditions. 3) measured on a p p roximatel y 1? sq uare of 1 oz cop per. th e exposed pa d mu st be soldered to a ground plane electri c al characteristi cs v in = 5v, v shdn = 0v, t a = +25 c, unless otherw i se noted. p a r a m e t e r s y m b o l conditio n m i n t y p m a x u n i t s shdn = hi gh 40 a supply cu rre nt i supp l y shd n = l o w, ichg = 0a, v bat t =4. 1 v 2 0 0 a battery voltage re gulatio n v bat t t = ?5 c to +75 c, i bat t = 0 4.16 4.20 4.24 v con s tant current reg u lation i chg v in = 5v , v bat t = 3.8v r chg = 3.3k ? 4 4 8 5 1 5 5 8 2 m a con s tant current variatio n v in = 5v, v bat t = 3.8v, tj = 0 c to +120 c, r chg = 1.6k ? to 8.0k ? 8 7 1 0 0 1 1 3 %i chg (4 ) end of cha r g e thre sh old i bf 7 . 5 1 0 1 2 . 5 %i chg (4 ) trickle curre n t v in = 5v , v bat t = 2.3v 5 10 15 %i chg (4 ) trickle t h re shold voltage 2 . 4 5 2 . 6 2 . 7 5 v trickle voltag e hyste r esi s 1 0 0 m v input acok up ra nge 6 . 7 7 7 . 3 v input acok low range 1 . 5 2 2 . 5 v acok and chg over- vol t age cla m p v z 8 . 2 v input over voltage protectio n o v p v in rising 6.7 7 7.3 v ovp hys t eres is 4 0 0 m v ? 2008 mps. all rights reserved.
MP26121 ? +28v, 1a li+ linear batt ch arger w i th flexible ntc interface MP26121 rev. 0 . 9 www.monolithicpower.com 3 9/15/2008 mps proprietar y information. un a u t horized photoc op y and duplication prohibited. electri c al characteristi cs (con tinued ) v in = 5v, v shdn = 0v, t a = +25 c, unless otherw i se noted. p a r a m e t e r s y m b o l conditio n m i n t y p m a x units shdn trip t h re shol d hig h 2.6 v shdn trip t h re shol d lo w 0.4 v shdn pull up curr ent i shdn v shdn =3v 6 a chg , acok sink curren t pin voltage = 0.4v 8 ma battery reverse current to batt pin shdn = lo w and input = f l oating or 0v 1 a dro pout voltage v in -v bat t v bat t = 3.8v, r chg = 6k ? . current drop 1 0 % 0 . 2 5 v die tem perature limit 105 120 135 c re cha r ge vol t age thre sh old v recha rge 3 . 9 4 . 0 4 . 1 v re cha r ge vol t age hysteresi s 1 0 0 m v ntc upp e r t h re shol d v nt c_up v in =5.00v, ntc pin voltag e risin g 2.735 v ntc upp e r t r ip hyste r e s i s 75 mv ntc l o wer t h re shol d v nt c_lo w v in =5.00v, ntc pin voltag e falling 1.197 v ntc l o w e r t r ip hyste r e s i s 20 mv oscillation f r eq c tm r = 2.2uf 5 hz tmr pin sour c e cur r e nt i tm r 1 v tm r = 0 . 1 v 2 0 a tmr pin sink current i tm r 2 v tm r = 1 . 5 v 2 0 a soft start tim e from t r ickle t o 90% full current, c ss =0.1f 8 0 m s notes : 4) i chg is the target prepro g ramme d charge curre nt ( d ie temperatu r e below 110c ) . ? 2008 mps. all rights reserved.
MP26121 ? +28v, 1a li+ linear batt ch arger w i th flexible ntc interface MP26121 rev. 0 . 9 www.monolithicpower.com 4 9/15/2008 mps proprietar y information. un a u t horized photoc op y and duplication prohibited. pin functio n s pin # name des c ription 1 vin input supply pin. vin recei v es the ac a dapter o r us b supply voltage. 2 acok open -drai n fault status indicato r. this pin is hig h un der any fault con d ition s . 3 chg open -drai n cha r ge indi cator. this pi n is low d u rin g cha r gin g , is h i gh after batte ry full or termin ation , and is toggli ng wh en the battery is in fault con d ition . 4 t m r oscillator pe riod timer. co nne ct a timing cap a cito r b e twee n this pi n and g nd to set the oscillator perio d. 5 gnd, exposed pad the expo sed pad an d gnd pin must be con n e c ted to the same g r o und pla ne. 6 shdn cha r ge r ic enable. an inp u t ?low? si gn al at this pin or pin floating will enable th e ic. 7 ss soft-start. conne ct a cap a c itor to groun d to set the soft-start time. 8 i s e t con s tant cha r ge current p r og ram pin. con n e c t this pin to an external resi stor t o prog ram the cha r gin g cu rrent in cc mo de. 9 n t c neg a tive temperature coefficient (nt c ) the r mi sto r pin. conne ct a resisto r r t1 from this pin to vin pin and a resi sto r r t2 from this pin to gnd in parallel with the nt c resi sto r (withi n the battery pack). if ntc function is n o t used, ap pl y r t2 =1/2 r t1 . do not leav e this pin floa ting . 1 0 b a t t cha r ge r outp u t . block diagram figure 1?functional block diagram ? 2008 mps. all rights reserved.
MP26121 ? +28v, 1a li+ linear batt ch arger w i th flexible ntc interface MP26121 rev. 0 . 9 www.monolithicpower.com 5 9/15/2008 mps proprietar y information. un a u t horized photoc op y and duplication prohibited. typical perfo r mance curves c in = 4.7f, c out = 2.2f, c ss = 0.1f, v in = 5v, t a = +25 c, unless otherw i se no ted. ? 2008 mps. all rights reserved.
MP26121 ? +28v, 1a li+ linear batt ch arger w i th flexible ntc interface MP26121 rev. 0 . 9 www.monolithicpower.com 6 9/15/2008 mps proprietar y information. un a u t horized photoc op y and duplication prohibited. typical perfo r mance curves (contin ued) c in = 4.7f, c out = 2.2f, c ss = 0.1f, v in = 5v, t a = +25 c, unless otherw i se no ted. ? 2008 mps. all rights reserved.
MP26121 ? +28v, 1a li+ linear batt ch arger w i th flexible ntc interface MP26121 rev. 0 . 9 www.monolithicpower.com 7 9/15/2008 mps proprietar y information. un a u t horized photoc op y and duplication prohibited. operation input voltage range the mp261 21 has built-in input voltage surge protection a s high a s + 28v. the ch arger ic will be automatically disa bled when the in put voltage is lower than 3. 0v or highe r than 7.0v. the open-drain pin acok is used to ind icate an input power good condition (i.e. 3.0v cc-> cv) figure 2 sh ows the typ ical charg i n g profile for the MP26121. for a fully depleted ba ttery with a terminal voltage lower than 2.6v, th e MP26121 will start with the trick l e charge (preconditio n ing) at 10% of the full charge current based on the value of r chg . if th e charger stays in trickle m ode longer than 32768 cy cles, chg becomes high impedance, indicating a battery fault. after t he battery voltage reaches 2.6v, the charger begins charging u s ing the progr ammed cha r ge current (i chg ).this is referred to as constant current (cc) mode. once the battery voltage reaches 4.2v, the charger will operate in t he constant voltage (cv) mode u n til the battery is fully charged. th e charge current drops during cv mode, and the battery full ind ication is set when the charge current is r educed to 10% of the programme d constant current value (i chg ). the charge process is then terminated. recharge will start aft e r the battery voltage is reduced to 4.0v. after 262144 cycles of continuou s charging, if the batter y still ha s not reache d 10% of the i chg conditio n , the on-ch ip tim e r will terminate the charger to prevent charging the dead batter y excessively and the fault condit i on will be flagg ed by flashi ng the chg led. charge termination the charge current will gradually decrease in cv mode a s the battery approaches full. the battery full threshold is internally programmed to be 10% of the i chg . when the charge current reaches thi s threshold, the charger ic will be automatically turned off. figure 2?MP26121 t y pical charging profile automatic recharge when v batt drops to 4.0v, the charger will automatically restart the charge cycle until the 10% i chg condition is m e t again. w hen the inpu t adapter is u nplugged, or the charger is disabled and/or termi nated, the leakage curr ent from the battery to the MP26121 is less than 1ua. programmi ng of charge current and battery full curren t the charge current (i ch g ) is set by a resistor (r chg ) connected from the iset pin to gnd. the relatio n ship betw een the ch arge curren t and the pro g ram m i ng resistance is established by the following table an d graph. table 1?r chg and i chg relationship r chg (k ? ) i chg (m a) 1 . 6 5 1 0 0 0 1 . 8 2 9 0 0 2 . 0 5 8 0 0 2 . 3 2 7 0 0 2 . 7 4 6 0 0 3 . 3 5 0 0 4 . 1 2 4 0 0 5 . 6 3 0 0 8 . 4 5 2 0 0 1 5 1 0 0 ? 2008 mps. all rights reserved.
MP26121 ? +28v, 1a li+ linear batt ch arger w i th flexible ntc interface MP26121 rev. 0 . 9 www.monolithicpower.com 8 9/15/2008 mps proprietar y information. un a u t horized photoc op y and duplication prohibited. figure 3?charge current vs. 1/r chg resistance the recom m ended resistance for program m i ng the charge current is 2 . 3k ? 27.285k ? with r t1 = 11.536k ? and r t2 =28.554 k ? . thermal protection the mp2 6121 has proprietary thermal protection to prevent t he ic from overheating. when in the r mal protection mode, the average charge curr ent will be r educed to p r event the ic from o v er heating. operating in thermal protection m ode will slow down the charging process. l o wering the input voltage and enhancing therm a l dissipat ion to the environment can effe ctivel y prevent the ic from going into th ermal protection mode. ? 2008 mps. all rights reserved.
MP26121 ? +28v, 1a li+ linear batt ch arger w i th flexible ntc interface MP26121 rev. 0 . 9 www.monolithicpower.com 9 9/15/2008 mps proprietar y information. un a u t horized photoc op y and duplication prohibited. under full charge con d itions, certain systems may draw a very narrow current pulse that exceeds th e ibf threshold. the chg indicator may glitch. it is de sirable to blank th e chg glitch so that the system ca n properly indicate full charge con d itions to th e user. a simple solutio n is to add a rc filter on the chg pin to filter out the possib le chg glitch, a s shown in fig u re 4. figure 4?filtered charge status with gpio connection ? 2008 mps. all rights reserved.
MP26121 ? +28v, 1a li+ linear batt ch arger w i th flexible ntc interface MP26121 rev. 0 . 9 www.monolithicpower.com 10 9/15/2008 mps proprietar y information. un a u t horized photoc op y and duplication prohibited. power-on reset (por) feature can be applied to the mp261 21 to ensure that the device starts operating in a known state. the flow chart in figure 5 de scribes the conditions a nd operatio n modes of the MP26121. cvc and ccc stand for ?constant voltage char ge? and ?constant curre nt charge?, respectively. figure 5?flow chart of operation ? 2008 mps. all rights reserved.
MP26121 ? +28v, 1a li+ linear batt ch arger w i th flexible ntc interface 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. MP26121 rev. 0 . 9 www.monolithicpower.com 11 9/15/2008 mps proprietar y information. un a u t horized photoc op y and duplication prohibited. package informati o n qfn10 (3mm x 3mm) ? 2008 mps. all rights reserved.

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