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mp26057 28v, 1a linear li-lon travel charger with trickle charge and timer mp26057 rev. 0.91 www.monolithicpower.com 1 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. the future of analog ic technology description the mp26057 is a linear, high performance single cell li-ion or li-polymer battery charger. by integrating high voltage input protection into the charger ic, the mp26057 can tolerate an input surge up to 28v. 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 other features include the programmable battery full threshold, termination and auto-recharge. mp26057 provides charger status indication to drive red and green leds (tri-color indication). for guaranteed safe operation, the mp26057 limits the die temperature to a preset value when the device is heated up due to limited pcb space. other safety features are battery temperature monitoring, and programmable timer to prevent prolonged charging a dead battery. mp26057 is available in a 10-pin 3mm x 3mm dfn package. features ? complete solution for charging single-cell lion-ion battery ? input surge up to 28v ? wide input operating range 3.5v ? 7v ? adapter or usb input ? programmable charge current: 200ma to 1a ? programmable timer ? termination and auto-recharge ? 0.75% v batt accuracy over temperature ? <1a battery reverse current ? 125a standby current from v in ? battery temperature monitoring ? automatic die temperature limiting ? fault and charge status indicators ? soft-start to limit inrush current ? tiny 3mm x 3mm qfn package 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 mp26057 in grn ntc ss bat iset gnd ibf tmr red 1 9 6 7 4 8 10 3 2 5 3.5v-6.5v u1 led1 green led2 red c1 35v c3 16v c2 16v c4 16v vin gnd ntc bat gnd
mp26057- 28v, 1a linear li-ion travel charger with trickle charge and timer mp26057 rev. 0.91 www.monolithicpower.com 2 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. package reference 1 2 3 4 5 10 9 8 7 6 part number* package temperature MP26057DQ qfn10 (3mm x 3mm) ?40 c to +85 c * for tape & reel, add suffix ?z (eg. MP26057DQ?z) for rohs compliant packaging, add suffix ?lf (eg. MP26057DQ?lf?z) absolute maxi mum ratings (1) in to gnd .................................... ?0.3v to +28v grn & red 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 5.5v 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 jedec51-7 4 layer board.. electrical characteristics v in = 5v, t a = +25 c, unless otherwise noted. parameter symbol condition min typ max units supply current i supply i chg = 0a, v batt =4.2v 140 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 ? 452 515 582 ma constant current variation v in = 5v, v batt = 3.8v, t j = 0c to +120c, r chg = 1.6k ? to 8.0k ? 87 100 113 %i chg (4) trickle current v in = 5v, v batt = 2.3v 5 10 15 %i chg (4) trickle threshold voltage v bat rising 2.45 2.6 2.75 v trickle voltage hysteresis 100 mv ibf accuracy 75 125 %i bf (5) input ovp v in rising 6.8 7 7.2 v ovp hysteresis 400 mv input uvlo v in rising 2.5 3 3.5 v uvlo hysteresis 100 mv grn and red over voltage clamp v z 7.6 v
mp26057- 28v, 1a linear li-ion travel charger with trickle charge and timer mp26057 rev. 0.91 www.monolithicpower.com 3 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. electrical characteristics (continued) v in = 5v, t a = +25 c, unless otherwise noted. parameter symbol condition min typ max units red/grn sink current pin voltage = 0.3v 5 ma battery reverse current to batt pin v in is floating or 0v, v bat =4.2v 1 a dropout voltage v in - v batt v batt = 3.8v, r chg = 6k ? . current drop 10% 0.25 v soft thermal shutdown threshold 105 120 135 c soft thermal shutdown hysteresis 10 c soft-start time c ss =0.1 f, v ss >1.1v 100 ms recharge voltage threshold v recharge 3.9 4.0 4.1 v recharge voltage hysteresis 100 mv r_ntc at 0c th11- 4h104f note: r_ntc is 100k at 25c 376.6 k ? r_ntc at 50c th11- 4h104f note: r_ntc is 100k at 25c 32.3 k ? oscillation freq c tmr = 2.2 f 5 hz tmr pin source current itmr1 v tmr =0.1v 18 20 22 a tmr pin sink current itmr2 v tmr =1.5v 18 20 22 a ntc up range v ntc rising 2.05 2.15 2.25 v hysteresis 150 mv ntc low range v ntc falling 0.27 0.3 0.33 v hysteresis 30 mv notes: 4) i chg is the target preprogrammed charge current (die temperature below 110c). 5) i bf is the target preprogrammed battery full current threshold
mp26057- 28v, 1a linear li-ion travel charger with trickle charge and timer mp26057 rev. 0.91 www.monolithicpower.com 4 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. pin functions pin # name description 1 in input supply pin. in receives the ac adapter. 2 grn open-drain charger status indicator. 3 red open-drain charger status indicator. 4 tmr oscillator period timer. connect a timing capacitor between this pin and gnd to set the oscillator period. time(sec) =22000xc tmr (f). short this pin to ground to disable timer. 5 gnd exposed pad ground. the exposed pad and gnd pin must be connected to the same ground plane. 6 ss soft start pin. connect to a 0.1f or higher capacitor to program the soft start time 7 iset constant charge current program pin. connect this pin to an external resistor to program the charging current in cc mode. 8 ibf charge status threshold program. connect this pin to an external resistor to program the charge termination current or battery full indication threshold. 9 ntc negative temperature coefficient (n tc) thermistor pin. connect a 500k ? resistor from this pin to the in pin and a 100k ? ntc resistor (within the battery pack) from this pin to ground. if ntc function is not used, replace ntc resistor with a regular 100k ? resistor from this pin to ground. do not leave this pin floating. 10 batt charger output.
mp26057- 28v, 1a linear li-ion travel charger with trickle charge and timer mp26057 rev. 0.91 www.monolithicpower.com 5 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. typical performanc e characteristics v in = 5v, c in = 4.7f, c out = 2.2f, i bf = 20k ? , t a = +25oc, unless otherwise noted. 420khz charge current (ma) charge current (ma) 0 0.3 0.6 0.9 1.2 1.5 battery sink current 2.7 3.0 3.3 3.6 3.9 4.2 constant current charge constant voltage charge charge current (ma) 0 0 100 200 300 400 500 600 700 800 900 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 100 20 120 40 60 80 0 0 200 600 400 1200 1000 800 charge current (ma) 0 200 600 400 1200 1000 800 12345 0 4.170 4.175 4.180 4.185 4.190 4.195 4.200 200 400 600 800 1000 1200 time (min) charge current (ma) 800ma charge curve 2.0 2.5 3.0 3.5 4.0 4.5 200 400 600 800 1000 1200 1400 1.5 2.0 2.5 3.0 3.5 4.0 4.5 charge current (ma) 0 0 30 60 90 120 150 180 210 240 270 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 250 50 300 100 150 200 time (min) 200ma charge curve i chg =1a 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 i chg =0.8a i chg =0.5a i chg =0.2a i set ( ma ) 0 200 400 600 800 1000 r set resistance vs. i set 0 0.1 0.3 0.2 0.6 0.5 0.4 charge current (ma) -40 520 530 540 550 560 570 80 -10 110 20 50 constant current charge vs. temperature
mp26057- 28v, 1a linear li-ion travel charger with trickle charge and timer mp26057 rev. 0.91 www.monolithicpower.com 6 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. typical performanc e characteristics (continued) v in = 5v, c in = 4.7f, c out = 2.2f, i bf = 20k ? , t a = +25oc, unless otherwise noted. short circuit no battery short circuit recovery no battery maximum input voltage v in =28v, no battery v in 5v/div v in 5v/div v bat 5v/div v grn 5v/div i chg 0.5a/div v in 5v/div v bat 5v/div v grn 5v/div i chg 0.5a/div i chg 0.5a/div v red 5v/div v bat 5v/div v in 5v/div i chg 0.5a/div v red 5v/div v bat 5v/div v in 5v/div i chg 50ma/div v chg 2v/div v bat 2v/div v in 20v/div v ared 5v/div v grn 5v/div i in 20ma/div 20ms/div v in 5v/div i chg 0.5a/div v chg 2v/div v bat 2v/div 2ms/div 20ms/div 100ms/div 100ms/div 4.15 4.17 4.19 4.21 4.23 4.25 -40 80 -10 110 20 50 constant voltage charge vs. temperature
mp26057- 28v, 1a linear li-ion travel charger with trickle charge and timer mp26057 rev. 0.91 www.monolithicpower.com 7 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. block diagram battery charge control 8 9 4 1 10 2 3 5 6 tmr iset ntc ibf c tmr r chg 7 r bf r ntc r1 in batt grn 8.2v 8.2v red gnd css v in c in c out i batt figure 1?functional block diagram
mp26057- 28v, 1a linear li-ion travel charger with trickle charge and timer mp26057 rev. 0.91 www.monolithicpower.com 8 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. operation input voltage range the mp26057 has built-in input voltage surge protection as high as +28v. the charger ic will be automatically enabled when the input voltage is higher than 3.0 and lower than 7.0v. if the input voltage is lower than the battery voltage, the ic is also disabled to prevent the battery from draining. charge cycle (mode change: trickle -> cc-> cv) figure 2 below shows the typical charging profile for the mp26057. for a fully depleted battery with a terminal voltage lower than 2.6v, the mp26057 will start with the trickle charge (preconditioning) at 10% of the full charge current based on the value of r pgm . if the charger stays in the trickle mode longer than 32768 cycles, red/grn pins become flashing indicating battery fault. after the battery voltage reaches 2.6v, the charger begins charging at the constant current of the programmed value (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 reduced to the preset value based on r ibf , and the charge process terminated. recharge will start after the battery voltage is for some reason reduced to 4.0v. after 262144 cycles of continuous charging, if the battery is still not reaching ibf condition, the on- chip timer will terminate the charger to prevent charging the dead battery for excessive long time and the fault condition will be flagged by flashing the red/grn leds. 2.6v 4.2v v batt 10% of i chg trickle charging cc charging charging complete cv charging i chg i bf i batt figure 2?mp26057 typical charging profile charge termination the charge current will gradually decrease in cv mode as the battery approaches full. the battery full threshold can be programmed by connecting a resistor from ibf pin to ground. when the charge current reaches this threshold, the charger ic will be automatically turned off. the battery voltage may decay after termination due to self discharge or system draw current from the battery. automatic recharge upon v batt drops to 4.0v, the charger will automatically restart the charge cycle until the ibf 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 mp26057 is less than 1a. programming of charge current and battery full current table 1?r pgm and i chg relationship r pgm (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 charge current vs 1/r pgm resistance 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/rpgm resistance
mp26057- 28v, 1a linear li-ion travel charger with trickle charge and timer mp26057 rev. 0.91 www.monolithicpower.com 9 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. the charge current (i chg ) is set by a resistor (r pgm ) connecting from the iset pin to gnd. the relationship of the charge current and the programming resistance is established by the following table and graph. the recommended resistance for programming the charge current is 2.3k ? 376.6k ? . this represents a valid charging temperature range of 0c to 50c for the th11-4h104f ntc resistor. thermal protection the mp26057 has proprietary thermal protection to prevent the ic from overheating. when in thermal protection mode, the charge current becomes a saw-tooth waveform instead of a dc current. the average current of the saw-tooth waveform will be lower than the programmed dc charge current 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. charger status indication (red & green) mp26057 has two charge status pins red and green, which can indicate and tell the charging status by chaning their states (on/off/flashing) as table 2 shows. table 2?charger status indication charging battery full & no batt timeout fault vin>7v batt cold & batt hot red on off flashing off off green off on flashing off off
mp26057- 28v, 1a linear li-ion travel charger with trickle charge and timer mp26057 rev. 0.91 www.monolithicpower.com 10 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. application flow chart of operation power-on reset (por) feature can be applied to the mp26057 to ensure that the device starts operating in a known state. the flow chart in figure 4 describes the conditions and operation modes of the mp26057. cvc and ccc stand for ?constant voltage charge? and ?constant current charge?, respectively. figure 4 ? flow chart operation
mp26057- 28v, 1a linear li-ion travel 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 w hen integrating mps products into any application. mps will not assume any legal responsibility for any said applications. mp26057 rev. 0.91 www.monolithicpower.com 11 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 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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