mp26058 28v, 1a li + linear battery charger with timer and ldo mode mp26058 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 mp26058 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 mp26058 can tolerate an input surge up to 28v. the ldo mode makes the mp26058 suitable for power up the system when battery is not present. the device features constant current (cc) and constant voltage (cv) charging modes with programmable charge currents (200ma to 1a), current blocking. the other features include the programmable battery full indication threshold and the ldo mode operation which keeps charging the battery after battery-full is asserted and stay in full-state as long as the valid input is maintained. mp26058 can provide load to the system if no battery is connected. for guaranteed safe operation, the mp26058 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. mp26058 is available in 10-pin 3mm x 3mm dfn packages. features ? complete solution for charging single-cell lion-ion battery ? input surge up to 28v ? wide input operating range 2.8v ? 7v ? adapter or usb input ? programmable charge current: 200ma to 1a ? programmable timer ? 7v input over voltage protection ? 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 batt iset tmr ibf gnd 10 8 9 7 5 in chg acok shdn ntc 1 2 3 4 6 3.5v - 6.5v
mp26058-28v, 1a li + linear battery charger with timer and ldo mode mp26058 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 top view in acok chg tmr gnd 1 2 3 4 5 batt ntc iset ibf shdn 10 9 8 7 6 exposed pad on backside part number* package temperature MP26058DQ qfn10 (3mm x 3mm) ?40 c to +85 c * for tape & reel, add suffix ?z (eg. MP26058DQ?z) for rohs compliant packaging, add suffix ?lf (eg. MP26058DQ?lf?z) absolute maxi mum ratings (1) in to gnd .................................... ?0.3v to +28v all other pins to gnd................. ?0.3v to +6.5v acok & chg maximum sink current?20ma 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, v shdn =0v, t a = +25 c, unless otherwise noted. parameter symbol condition min typ max units supply current i supply shdn = high 30 a shdn = low, i chg = 0a 500 battery voltage regulation v batt t = ?5c to +75c, i batt = 0a 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, t j = 0c to +120c, r chg = 1.6k ? to 8.0k ? 87 100 113 %ichg (4) battery full programming range i bf refer to operation section for programming ibf 10 50 %ichg (4) ibf accuracy 75 125 %ibf(5) input ovp v in rising 6.7 7 7.3 v ovp hysteresis 400 mv input uvlo v in rising 1.6 2.2 2.8 v uvlo hysteresis 100 mv input acok up range 6.7 7 7.2 v acok & chg over voltage clamp v z 7.6 v
mp26058-28v, 1a li + linear battery charger with timer and ldo mode mp26058 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, 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 chg , acok sink current pin voltage = 0.2v 5 ma battery reverse current to batt pin shdn = low and input = floating or 0v 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 internal soft-start time from 10% to 90% of full current 20 s 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 = 2.2uf 5 hz tmr pin source current i tmr1 v tmr =0.1v 18 20 22 a tmr pin sink current i tmr2 v tmr =1.5v 18 20 22 a 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.
mp26058-28v, 1a li + linear battery charger with timer and ldo mode mp26058 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 or usb supply voltage. 3 chg open-drain charge indicator. this pin is low during charging, is high after battery full or termination, is toggling the battery is fault. 2 acok open-drain fault status indicator. 4 tmr oscillator period timer. connect a timing capacitor between this pin and gnd to set the oscillator period. t(sec)=22000 * c tmr ( f). short this pin to gr ound to disable timer. 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 if the pin is floating will enable the ic. 8 iset constant charge current program pin. connect this pin to an external resistor to program the charging current in cc mode. 7 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.
mp26058-28v, 1a li + linear battery charger with timer and ldo mode mp26058 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 c in =4.7f, c out =2.2f, v in =5v, t a =25oc, unless otherwise noted. 1 200 400 600 800 1000 1200 23456 v ce (v) thermal protection (v ce =v in -v bat ) 0 200 0 0.1 0.2 0.3 0.4 0.5 0.6 400 600 800 1000 i set (ma) r chg resistance vs. i chg battery voltage (v) charge current (ma) constant voltage charge charge current (ma) input voltage (v) constant current charge vs. input voltage v bat =3.8v i chg (ma) vbat (v) vstatus (v) 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 30 60 90 120 150 180 4.0 4.5 0 200 400 600 800 1000 1200 5.0 5.5 6.0 6.5 7.0 1.0 0 200 400 600 800 1000 1.8 2.6 3.4 4.2 5.0 0 4.17 4.18 4.20 4.22 4.21 4.19 200 400 600 800 1000 time (min) battery voltage (v) battery charge curve charge current vs. battery voltage i chg (ma) v bat i chg v status thermal prot ect ion i chg =0.8a i chg =0.5a i chg =0.2a i chg =0.2a i chg =0.5a i chg =0.8a i chg =0.2a i chg =0.5a i chg =0.8a i chg =1a
mp26058-28v, 1a li + linear battery charger with timer and ldo mode mp26058 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 c in =4.7f, c out =2.2f, v in =5v, t a =25oc, unless otherwise noted. ( continued )
mp26058-28v, 1a li + linear battery charger with timer and ldo mode mp26058 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 3 2 5 6 tmr iset ntc r ntc c tmr r chg 7 ibf r bf r1 in batt chg 8.2v 8.2v acok gnd shdn v in c in c out v batt + _ off on i batt figure 1?functional block diagram operation input voltage range the mp26058 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 2.2v or higher than 7.0v. for mp26058, the open-drain pin acok is used to indicate an input power good condition (i.e. 2.8v ldo) figure 2 below shows the typical charging profile for the mp26058. it 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 ldo mode to keep the battery is fully charged. the charge current drops during ldo mode, and the battery full indication is set when the charge current reduced to the preset value based on r bf . 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 chg led. 4.2v v bat i bf i bf c.c charging c.v charging i bat figure 2?mp26058 typical charging profile
mp26058-28v, 1a li + linear battery charger with timer and ldo mode mp26058 rev. 0.91 www.monolithicpower.com 8 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. programming of charge current and battery full current the charge current (i chg ) is set by a resistor (r chg ) 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. 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 8.66 200 16.9 100 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/r chg resistance 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 mp26058 has proprietary thermal protection to prevent the ic from overheating. when in thermal protection mode, the charge current will reduce to maintain the safe junction temperature. 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.
mp26058-28v, 1a li + linear battery charger with timer and ldo mode mp26058 rev. 0.91 www.monolithicpower.com 9 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 mp26058 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 mp26058. cvc and ccc stand for ?constant voltage charge? and ?constant current charge?, respectively. figure 4 ? flow chart operation
mp26058-28v, 1a li + linear battery charger with timer and ldo mode 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. mp26058 rev. 0.91 www.monolithicpower.com 10 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
|
