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mp26053 28v, 1a li-ion/li-polymer battery charger with 10% battery-full threshold, trickle charge and timer mp26053 rev. 0.9 www.monolithicpower.com 1 8/25/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. the future of analog ic technology description the mp26053 is a linear, high-performance single cell li-ion/li-polymer battery charger. by integrating high voltage input protection into the charger ic, the mp26053 can tolerate an input surge up to +28v. in addition, the mp26053 features an internally programmed precision battery full-threshold of 10% of i chg . the device features constant current (cc) and constant voltage (cv) charging modes with programmable charge currents (200ma to 1a), current blocking, and trickle charge. the device also provides fault and charge status indications to the system. for guaranteed safe operation, the mp26053 reduces charge current when the device reaches high temperature (due to limited pcb space). other safety features include battery temperature monitoring and programmable timer to complete the charging cycle. the mp26053 is available in 10-pin 3mm x 3mm qfn packages. features ? proprietary v in surge protection up to 28v ? 10% battery-full threshold ? programmable charge current : 200ma to 1.0a ? trickle charge ? 40a shutdown current ? 7v input ovp ? auto recharge ? charge-timer ? fault and charge status indicators applications ? cell phones ? digital cameras ? smart phones ? pdas ? mp3 players ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application mp26053 batt iset tmr ss gnd 10 8 9 7 5 in chg acok shdn ntc 1 2 3 4 6 to system i batt v batt 3.5v - 6.5v off on v in c ss
mp26053 ? 28v, 1a linear battery charger with trickle charge and timer mp26053 rev. 0.9 www.monolithicpower.com 2 8/25/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. package reference 1 2 3 4 5 10 9 8 7 6 part number* package temperature MP26053DQ qfn10 (3mm x 3mm) ?40 c to +85 c * for tape & reel, add suffix ?z (e.g. MP26053DQ?z) for rohs compliant packaging, add suffix ?lf (e.g. MP26053DQ?lf?z) absolute maximum ratings (1) in to gnd .................................... ?0.3v to +28v acok and chg maximum sink current........20ma all other pins to gnd..................-0.3v to +6.5v junction temperature...............................140 c lead temperature ....................................260 c storage temperature ..............?65c to +150 c recommended operating conditions (2) nominal supply 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 may damage the device. 2) the device is not guaranteed to function outside of its operating conditions. 3) measured on approximately 1? square of 1 oz copper. the exposed pad must be soldered to a ground plane electrical characteristics v in = 5v, v shdn = 0v, t a = +25 c, unless otherwise noted. parameter symbol condition min typ max units shdn = high 40 a supply current i supply shdn= low, ichg = 0a, v batt =4.1v 200 a battery voltage regulation v batt t = ?5c to +75c, i batt = 0 4.16 4.20 4.24 v constant current regulation i chg v in = 5v, v batt = 3.8v r chg = 3.3k ? 448 515 582 ma constant current variation v in = 5v, v batt = 3.8v, tj = 0c to +120c, r chg = 1.6k ? to 8.0k ? 87 100 113 %i chg (4) end of charge threshold i bf 7.5 10 12.5 %i chg (4) trickle current v in = 5v, v batt = 2.3v 5 10 15 %i chg (4) trickle threshold voltage 2.45 2.6 2.75 v trickle voltage hysteresis 100 mv input acok up range 6.7 7 7.3 v input acok low range 1.5 2 2.5 v acok and chg over- voltage clamp v z 8.2 v input over voltage protection ovp v in rising 6.7 7 7.3 v ovp hysteresis 400 mv
mp26053 ? 28v, 1a linear battery charger with trickle charge and timer mp26053 rev. 0.9 www.monolithicpower.com 3 8/25/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. electrical characteristics (continued) v in = 5v, v shdn = 0v, t a = +25 c, unless otherwise noted. parameter symbol condition min typ max units shdn trip threshold high 2.6 v shdn trip threshold low 0.4 v shdn pull up current i shdn v shdn =3v 6 a chg , acok sink current pin voltage = 0.4v 8 ma battery reverse current to batt pin shdn = low and input = floating or 0v 1 a v in reverse current grount current at vin=-6v 10 ma dropout voltage v in -v batt v batt = 3.8v, r chg = 6k ? . current drop 10% 0.25 v die temperature limit 105 120 135 c recharge voltage threshold v recharge 3.9 4.0 4.1 v recharge voltage hysteresis 100 mv ntc upper threshold v ntc_up v in =5.00v, ntc pin voltage rising 1.71 1.76 1.81 v ntc upper trip hysteresis 75 mv ntc lower threshold v ntc_low v in =5.00v, ntc pin voltage falling 0.35 0.38 0.41 v ntc lower trip hysteresis 20 mv oscillation freq c tmr = 2.2uf 5 hz tmr pin source current i tmr1 v tmr =0.1v 20 a tmr pin sink current i tmr2 v tmr =1.5v 20 a soft start time from trickle to 90% full current, c ss =0.1 f 80 ms notes: 4) i chg is the target preprogrammed charge current (die temperature below 110c).
mp26053 ? 28v, 1a linear battery charger with trickle charge and timer mp26053 rev. 0.9 www.monolithicpower.com 4 8/25/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. pin functions pin # name description 1 vin input supply pin. vin receives t he ac adapter or usb supply voltage. 2 acok open-drain fault status indicator. this pin is high under any fault conditions. 3 chg open-drain charge indicator. this pin is lo w during charging, is high after battery full or termination, and is toggling when the battery is in fault condition. 4 tmr oscillator period timer. connect a timing capacitor between this pin and gnd to set the oscillator period. the total charge time: tmr 3 ) sec ( c * 10 22 t = , where c tmr is in f. 5 gnd, exposed pad the exposed pad and gnd pin must be connected to the same ground plane. 6 shdn charger ic enable. an input ?low? signal at this pin or pin floating will enable the ic. 7 ss soft-start. connect a capacitor to ground to set the soft-start time. 8 iset constant charge current program pin. connec t this pin to an external resistor to program the charging current in cc mode. 9 ntc negative temperature coefficient (n tc) thermistor pin. connect a 50k ? resistor from this pin to the vin pin and a 10k ? ntc resistor (within the battery pack) from this pin to ground. if ntc function is not used, replace ntc resistor with a regular 10k ? resistor from this pin to ground. do not leave this pin floating . 10 batt charger output. block diagram battery charge control 7 8 9 4 1 10 3 2 5 6 tmr iset ntc r ntc c ss ss c tmr r chg in batt chg acok gnd 8.2v 8.2v v z v z shdn v in c in c out v batt + _ on off i batt figure 1?functional block diagram
mp26053 ? 28v, 1a linear battery charger with trickle charge and timer mp26053 rev. 0.9 www.monolithicpower.com 5 8/25/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. typical performance curves c in = 4.7f, c out = 2.2f, c ss = 0.1f, v in = 5v, t a = +25 c, unless otherwise noted. i chg (ma) 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0 v in (v) i chg current vs input voltage 1200 1000 800 600 400 200 0 1200 1000 800 600 400 200 0 2.7 3.0 3.3 3.6 3.9 4.2 charge current vs battery voltage 1200 1000 800 600 400 200 0 0 1.0 2.0 3.0 4.0 5.0 v bat (v) v bat (v) charge current vs battery voltage 0.6 0.5 0.4 0.3 0.2 0.1 0 0 200 400 600 800 1000 i set (ma) 1/r set vs. i set i chg (ma) v bat (v) v stat (v) i chg (ma) i chg (ma) 0 32 64 96 128 160 time (min) battery charge curve i chg =0.8a i chg =0.5a i chg =0.2a i chg =1a i chg =0.8a i chg =0.5a i chg =0.2a i chg =1a v bat =4v v bat =4.1v v in 5v/div. v sd 2v/div. v bat 2v/div. i chg 0.5a/div. v in 5v/div. v sd 2v/div. v bat 2v/div. i chg 0.5a/div. v in 5v/div. v chg 2v/div. v bat 2v/div. i chg 0.5a/div. 4ms/div. 4ms/div. 40ms/div. shut down low v in = 5v, i set resistor = 2.26k shut down high v in = 5v, i set resistor = 2.26k v bat = 3.8v power ramp up vs. battery charge v in = 5v, i set resistor = 2.3k v bat v stat i chg 600 500 400 300 200 100 0 4.50 3.75 3.00 2.25 1.50 0.75 0
mp26053 ? 28v, 1a linear battery charger with trickle charge and timer mp26053 rev. 0.9 www.monolithicpower.com 6 8/25/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. typical performance curves (continued) c in = 4.7f, c out = 2.2f, c ss = 0.1f, v in = 5v, t a = +25 c, unless otherwise noted. 0 10 20 30 40 50 i chg (ma) 520 530 540 550 560 570
mp26053 ? 28v, 1a linear battery charger with trickle charge and timer mp26053 rev. 0.9 www.monolithicpower.com 7 8/25/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. operation input voltage range the mp26053 has built-in input voltage surge protection as high as +28v. the charger ic will be automatically disabled when the input voltage is lower than 3.0v or higher than 7.0v. the open-drain pin acok is used to indicate an input power good condition (i.e. 3.0v cc-> cv) figure 2 shows the typical charging profile for the mp26053. for a fully depleted battery with a terminal voltage lower than 2.6v, the mp26053 will start with the trickle charge (preconditioning) at 10% of the full charge current based on the value of r chg . if the charger stays in trickle mode longer than 32768 cycles, chg becomes high impedance, indicating a battery fault. after the battery voltage reaches 2.6v, the charger begins charging using the programmed charge current (i chg ).this is referred to as constant current (cc) mode. once the battery voltage reaches 4.2v, the charger will operate in the constant voltage (cv) mode until the battery is fully charged. the charge current drops during cv mode, and the battery full indication is set when the charge current is reduced to 10% of the programmed constant current value (i chg ). the charge process is then terminated. recharge will start after the battery voltage is reduced to 4.0v. after 262144 cycles of continuous charging, if the battery still has not reached 10% of the i chg condition, the on-chip timer will terminate the charger to prevent charging the dead battery excessively and the fault condition will be flagged by flashing the chg led. charge termination the charge current will gradually decrease in cv mode as the battery approaches full. the battery full threshold is internally programmed to be 10% of the i chg . when the charge current reaches this threshold, the charger ic will be automatically turned off. 2.6v 4.2v v batt 10% of i chg trickle charging cc charging charging complete cv charging i chg i batt figure 2?mp26053 typical 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 met again. when the input adapter is unplugged, or the charger is disabled and/or terminated, the leakage current from the battery to the mp26053 is less than 1ua. programming of charge current and battery full current the charge current (i chg ) is set by a resistor (r chg ) connected from the iset pin to gnd. the relationship between the charge current and the programming resistance is established by the following table and graph. table 1?r chg and i chg relationship r chg (k ? ) i chg (ma) 1.65 1000 1.82 900 2.05 800 2.32 700 2.74 600 3.3 500 4.12 400 5.6 300 8.45 200 15 100
mp26053 ? 28v, 1a linear battery charger with trickle charge and timer mp26053 rev. 0.9 www.monolithicpower.com 8 8/25/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. charge current vs. 1/r chg 1000 900 800 700 600 500 400 300 200 charge current (ma) 0 0.2 0.1 0.3 0.4 0.6 0.7 0.5 figure 3?charge current vs. 1/r chg resistance the recommended resistance for programming the charge current is 2.3k ? 27.285k ? . this represents a valid charging temperature range of 0c to 50c for the ewtf03-103 j31 h ntc resistor. thermal protection the mp26053 has proprietary thermal protection to prevent the ic from overheating. when in thermal protection mode, the average charge current will be reduced to prevent the ic from overheating. operating in thermal protection mode will slow down the charging process. lowering the input voltage and enhancing thermal dissipation to the environment can effectively prevent the ic from going into thermal protection mode.
mp26053 ? 28v, 1a linear battery charger with trickle charge and timer mp26053 rev. 0.9 www.monolithicpower.com 9 8/25/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. under full charge conditions, certain systems may draw a very narrow current pulse that exceeds the ibf threshold. the chg indicator may glitch. it is desirable to blank the chg glitch so that the system can properly indicate full charge conditions to the user. a simple solution is to add a rc filter on the chg pin to filter out the possible chg glitch, as shown in figure 4. tmr 4 ntc 9 in 1 ss 7 shdn 6 acok 3 chg 2 gnd 5 is et 8 bat 10 vbat vin chg acok sd ntc figure 4?filtered charge status with gpio connection
mp26053 ? 28v, 1a linear battery charger with trickle charge and timer mp26053 rev. 0.9 www.monolithicpower.com 10 8/25/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. power-on reset (por) feature can be applied to the mp26053 to ensure that the device starts operating in a known state. the flow chart in figure 5 describes the conditions and operation modes of the mp26053. cvc and ccc stand for ?constant voltage charge? and ?constant current charge?, respectively. figure 5?flow chart of operation
mp26053 ? 28v, 1a linear battery charger with trickle charge and timer notice: the information in this document is subject to change wi thout notice. users should warra nt and guarantee that third party intellectual property rights are not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. mp26053 rev. 0.9 www.monolithicpower.com 11 8/25/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. package information 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 marking 1.70 0.50 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 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

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