mp2631 28v, 1a, li-lon, linear battery charger with 10ma high voltage ldo mp2631 rev.0.9 www.monolithicpower.com 1 9/15/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. the future of analog ic technology description the mp2631 is a linear, high performance single cell li-ion or li-polymer battery charger with 10ma ldo. by integrating high voltage input protection into the charger ic, the mp2631 can tolerate an input surge up to 28v. the internal 5v ldo can be used as a system watchdog supply to monitor charge status. the ldo is on when the input voltage is greater than 3v and less than 7v, and remains on when the mp2631 is in shdn mode. when input is higher than 7.0v, the ldo output will be cut off from the input. when input is lower than 5v, the ldo will work in the dropout region. the device features constant current (cc) and constant voltage (cv) charging modes with programmable charge current (200ma to 1a), auto-recharge and trickle charge. mp2631 provides acok and charge status indications to the system. the ovp circuitry will automatically disconnect both charger and ldo from input when v in exceeds 7v. for guaranteed safe operation, the mp2631 limits the die temperature to a preset value when the device is heated up due to limited pcb space. mp2631 is available in 10-pin 3mm x 3mm qfn package. features ? complete solution for charging single-cell li-ion battery ? input surge protection up to 28v ? 5v ldo output ? 3v to 7v input operating range ? programmable charge current: 200ma to 1a ? termination and auto-recharge ? 0.75% v batt accuracy over temperature ? <1a battery reverse current ? automatic die temperature limiting ? fault and charge status indicators ? external soft-start to control inrush current ? 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 circuit in ss ack chg shdn ldo bat iset nc gnd MP2631DQ led1 green r1 1k led2 red 5-6.5v c1 35v c6 c5 ns c3 ns r2 1k r3 1.96k 2 3 4 6 1 10 9 8 7 5 vin ldo bat gnd gnd acok chg shdn u1 1% 4 r 3.09k 1% 5 r 7.68k 1% jp1 jp2 jp3
mp2631?28v, 1a linear li-ion battery charger with 10 m a high voltage ldo mp2631 rev.0.9 www.monolithicpower.com 2 9/15/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. package reference top view in ss/nc acok chg gnd 1 2 3 4 5 ldo batt iset nc shdn 10 9 8 7 6 exposed pad on backside part number* package temperature MP2631DQ qfn10 (3mm x 3mm) ? 4 0 c to +85 c * for tape & reel, add suffix ?z (eg. MP2631DQ?z) for rohs compliant packaging, add suffix ?lf (eg. MP2631DQ?lf?z) absolute maxi mum ratings (1) in to gnd ...................................... ?0.3v to 28v 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 approximately 1? square of 1 oz copper. electrical characteristics v in = 5.2v, v en = 0v, t a = +25 c, unless otherwise noted. parameter symbol condition min typ max units input quiescent current i supply shdn= low, v batt =4.25v, ildo = 0a, v in 5.2v 950 a battery voltage regulation v batt t = ?5c to +75c, i batt = 0 4.16 4.20 4.24 v ldo out v out iout = 0 - 10ma, vin = 5.0 ? 6.5 v 4.85 5.0 5.15 v min ldo output voltage v out_min i=2ma, vin=5.0v 4.85 v ldo load regulation load < 10ma 0.005 v/ma ldo short current limit 80 ma ovp threshold input rising 6.7 7.0 7.3 v constant current regulation i chg v batt = 3.8v r chg = 3.3k 475 530 585 ma constant current variation v batt = 3.8v, t j = 0c to +120c, 87 100 113 %i chg (4) trickle current v batt = 2.3v 5 10 15 %i chg (4) trickle threshold voltage v batt rising 2.45 2.6 2.75 v trickle voltage hysteresis 100 mv ibf threshold i bf in cv mode 5 10 15 %i chg ovp threshold ovp vin rising 6.7 7 7.3 v ovp hysteresis 400 mv uvlo vin rising 1.6 2.1 2.5 v
mp2631?28v, 1a linear li-ion battery charger with 10 m a high voltage ldo mp2631 rev.0.9 www.monolithicpower.com 3 9/15/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. electrical characteristics (continued) v in = 5.2v, v en = 0v, t a = +25 c, unless otherwise noted. parameter symbol condition min typ max units uvlo hysteresis 150 mv shdn trip threshold high 1.5 v shdn trip threshold low 0.4 v chg , acok sink current pin voltage = 0.2v 4 ma battery reverse current to batt pin shdn = low and input = floating or 0v 1 a soft thermal shutdown threshold tlim 105 120 135 c soft thermal shutdown hysteresis 10 c soft-start time from trickle to 90% of full current, (css absent) 300 us recharge voltage threshold v recharge v batt falling from 4.2v 3.9 4.0 4.1 v recharge voltage hysteresis 100 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. pin functions pin # name description 1 in input supply pin. in receives t he ac adapter or usb supply voltage. 2 ss/nc soft start pin. if it is left open, internal fixed ss is operated and the charger will not charge a battery when its initial voltage is higher than the recharge threshold (4.0v). 3 acok open-drain input fault indicator. this pin is low when 2.1v < vin < 7.0v 4 chg open-drain charge indicator. this pin is low during charging, is high after battery full or termination. 5 gnd exposed pad ground. exposed pad and gnd pin must be connected to same ground plane 6 shdn used for charger termination. an input ?low? signal at this pin or if the pin floating will enable the charger. 7 nc no connection 8 iset constant charge current program pin. connect this pin to an external resistor to program the charging current in cc mode. 9 batt charger output 10 ldo ldo output
mp2631?28v, 1a linear li-ion battery charger with 10 m a high voltage ldo mp2631 rev.0.9 www.monolithicpower.com 4 9/15/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. typical performanc e characteristics c1=4.7uf, c2=0.1uf, c4=2.2uf, v in =5v, t a =25oc, 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) charge 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 i set (ma) 1/r set vs. i set i chg (ma) v bat (v) i chg (ma) i chg (ma) i rev (ma) charge time (min) battery charge curve v bat =4v v bat =4.1v 0 100 200 300 400 500 600 700 800 900 0 20 40 60 80 100 120 140 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 v bat i chg i chg = 1a i chg = 0.8a i chg = 0.5a i chg = 0.2a thermal protection i chg = 1a i chg = 0.8a i chg = 0.5a i chg = 0.2a 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 200 300 400 500 600 700 800 900 1000 v bat =3.8v v dropout (mv) v out (v) ldo voltage dropout trickle charge curve v bat (v) ldo load regulation i chg (ma) 0 20 40 60 80 100 120 0 0.5 1.0 1.5 2.0 2.5 i chg = 100ma i chg = 80ma i chg = 50ma i chg = 20ma 0 5 10 15 20 25 30 35 40 45 50 0246810 load current (ma) load current (ma) 4.80 4.85 4.90 4.95 5.00 5.05 5.10 0246810 v in =5v
mp2631?28v, 1a linear li-ion battery charger with 10 m a high voltage ldo mp2631 rev.0.9 www.monolithicpower.com 5 9/15/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. typical performanc e characteristics (continued) c1=4.7uf, c2=0.1uf, c4=2.2uf, v in =5v, t a =25oc, unless otherwise noted. v bat vs. temperature current charge vs. temperature v in 5v/div. v chg 5v/div. v bat 5v/div. i in 0.2a/div. v in 5v/div. v chg 5v/div. v bat 5v/div. i in 0.2a/div. v in 5v/div. v chg 5v/div. v out 5v/div. i in 10ma/div. 4.2 4.4 4.6 4.8 5.0 5.2 4.5 4.9 5.3 5.7 6.1 6.5 200 400 600 800 1000 1200 1400 1.0 1.5 2.0 2.5 3.0 3.5 4.0 520 530 540 550 560 570 -40 -10 20 50 80 110 3.90 3.94 3.98 4.02 4.06 4.10 -40 -10 20 50 80 110
mp2631?28v, 1a linear li-ion battery charger with 10 m a high voltage ldo mp2631 rev.0.9 www.monolithicpower.com 6 9/15/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. typical performanc e characteristics (continued) c1=4.7uf, c2=0.1uf, c4=2.2uf, v in =5v, t a =25oc, unless otherwise noted. v in 5v/div. v shdn 5v/div. v bat 5v/div. i chg 0.5a/div. v in 5v/div. v chg 5v/div. v bat 5v/div. i chg 0.2a/div. v in 5v/div. v chg 5v/div. v bat 5v/div. i chg 0.2a/div. v in 5v/div. v shdn 5v/div. v bat 5v/div. i chg 0.5a/div. 200ms/div. 100ms/div. recovery input voltage (ldo) v in =6.6v, v o =5v, i o =5ma v in 5v/div. v chg 5v/div. v out 5v/div. i in 10ma/div. 10ms/div. 10ms/div. power ramp up vs. battery charge v bat =4.1v, c ss =0.1uf power ramp down vs. battery charge v bat =4.1v, c ss =0.1uf v in 5v/div. v chg 5v/div. v bat 5v/div. i chg 0.5a/div. 10ms/div. v in 5v/div. v chg 5v/div. v bat 5v/div. i chg 0.5a/div. 10ms/div.
mp2631?28v, 1a linear li-ion battery charger with 10 m a high voltage ldo mp2631 rev.0.9 www.monolithicpower.com 7 9/15/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. block diagram battery charge control v in in ldo iset i r pgm battery shdn r s r s ss/nc acok chg gnd figure 1?functional block diagram operation input voltage range the mp2631 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 2.1v or higher than 7.0v. for mp2631, the open-drain pin acok is used to indicate an input power good condition (i.e. 3.5vcc-> cv) figure 2 below shows the typical charging profile for the mp2631. it begins charging at the constant current of the programmed value (i chg ). this is referred to as constant current (cc) mode. for a deeply discharged battery, it will start trickle at 10% of the programmed charge current until battery voltage reaches 2.6v. once the battery voltage reaches 4.2v, the charger will operate in the constant voltage (cv) charge mode. the charge current drops during cv mode, and the battery full indication is set when the charge current reduces to the battery full value (i bf ) at 10% of the nominal charge current. 2.6v 4.2v v batt i chg 10% of i chg i batt charging complete cv charging cc charging trickle charging figure 2?mp2631 typical charging profile
mp2631?28v, 1a linear li-ion battery charger with a 10 m a high voltage ldo mp2631 rev.0.9 www.monolithicpower.com 8 9/15/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. programming of charge current and battery full current 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. table 1?r pgm and i chg relationship r pgm (k ? ) i chg (ma) 1.55 1000 1.72 900 1.94 800 2.21 700 2.58 600 3.1 500 3.87 400 5.16 300 7.75 200 15.5 100 the open-drain pin chg is used to indicate charging status. when the battery full condition is reached or any other condition prevents the charger from charging, chg will become floating and the charge function is terminated. the charger will begin recharging when the battery voltage is reduced to 4.0v due to any kind of leakage. ldo operation the on-chip current limited ldo will regulate its output at 5v for the input voltage from 5.1v to 6.5v. when v in is below 5.1v, it will work in the dropout mode. ldo is always on no matter what state of shdn is, unless ovp is reached. it can handle a maximum load of 10ma. a 0.1uf -1uf cap at the output is recommended.
mp2631?28v, 1a linear li-ion battery charger with a 10 m a high voltage ldo 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. mp2631 rev.0.9 www.monolithicpower.com 9 9/15/2008 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
|
