MP26056 28v, li+single-cell battery charger with usb/ac-adapter input MP26056 rev. 0.91 www.monolithicpower.com 1 3/30/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. the future of analog ic technology description the MP26056 is a linear, high performance single cell li-ion or li-polymer battery charger with dual programmable constant current set. by integrating high voltage input protection into the charger ic, the MP26056 can tolerate an input surge up to 28v. the device features constant current (cc) and constant voltage (cv) charging modes, reverse current blocking and trickle charge. other features include the programmable battery full threshold supporting dual ac/usb input by automatically changing to a lower charge current when the usb is the power supply. the MP26056 also provides acok and charge status indications to the system. for guaranteed safe operation, the MP26056 limits the die temperature to a preset value when the device is heated up due to limited pcb space. other safety features include battery temperature monitoring and programmable timer to prevent prolonged charging a dead battery. MP26056 is available in 10-pin 3mm x 3mm qfn packages. features ? complete solution for charging single-cell lion-ion battery ? input surge up to 28v ? dual usb/ac-adapter input with auto charge-current control ? wide input operating range 3.5v to 6.5v ? 7v input over-voltage protection ? programmable charge current: 200ma to 1a ? 80a idle current with usb input ? 0.75% v batt accuracy over temperature ? <1 a battery reverse current ? automatic die temperature limiting ? fault and charge status indicators ? internal 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 MP26056 iset1 mod ibf gnd 10 8 9 7 5 vin bat chg acok shdn iset2 1 2 3 4 6 vin 3.5~6.5 gnd bat gnd led2 green led1 red u1 mod shdn
MP26056- 28v, li+single-cell battery charger with usb/ac-adapter input MP26056 rev. 0.91 www.monolithicpower.com 2 3/30/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. package reference 1 2 3 4 5 10 9 8 7 6 part number* package MP26056dq qfn10 (3mm x 3mm) temperature top marking ?40 c to +85 c w7yw * for tape & reel, add suffix ?z (e.g. MP26056dq?z) for rohs compliant packaging, add suffix ?lf (e.g. MP26056dq?lf?z) absolute maxi mum ratings (1) in to gnd .................................... ?0.3v to +28v acok & chg maximum sink current??25ma 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, v en = 0v, t a = +25 c, unless otherwise noted. parameter symbol condition min typ max units mod = high, shdn = low, i chg = 0a 80 idle current i supply mod = low, shdn = low, i chg = 0a 500 a input over-voltage protection ovp v in rise 6.8 7.0 7.2 v ovp hysteresis 400 mv battery voltage regulation v batt t = ?5c to +75c, i batt = 0 4.16 4.20 4.24 v ac constant current regulation i chg v in = 5v, v batt = 3.8v r iset1 = r iset2 = 3.2k ? , mod=low 475 525 585 ma usb constant current regulation i chg v in = 5v, v batt = 3.8v r iset1 = r iset2 = 3.2k ? , mod=high 246 268 297 ma constant current variation v in = 5v, v batt = 3.8v, t j = 0c to +120c, i chg = 0.2a ? 1a 87 100 113 %i chg (4)
MP26056- 28v, li+single-cell battery charger with usb/ac-adapter input MP26056 rev. 0.91 www.monolithicpower.com 3 3/30/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. electrical characteristics (continued) v in = 5v, v en = 0v, t a = +25 c, unless otherwise noted. parameter symbol condition min typ max units battery full programming range i bf refer to operation section for programming i bf 10 50 %i chg (4) ibf accuracy 75 125 %i bf (5) input acok up range input rising 6.7 7 7.3 v input acok up range hysteresis 400 mv input acok low range input rising 1.5 2 2.5 v input acok low range hysteresis 200 mv protection error voltage v z 8.2 v shdn trip threshold high 2.6 v shdn trip threshold low 0.4 v mod trip threshold, high 2.6 v mod trip threshold, low 0.4 v 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 dropout voltage v in -v batt v batt = 3.8v, r chg = 6k ? . current drop 10% 0.25 v recharge threshold voltage v recharge 3.9 4.0 4.1 v soft thermal shutdown threshold 105 120 135 c soft thermal shutdown hysteresis 10 c internal soft-start time from tri ckle to 90% of full current 10 ms 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
MP26056- 28v, li+single-cell battery charger with usb/ac-adapter input MP26056 rev. 0.91 www.monolithicpower.com 4 3/30/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. pin functions pin # name description 1 in input supply pin. in receives the ac adapter or usb supply voltage. 2 acok open-drain ovp indicator. this pin is low when 3.5v < v in < 6.5v. 3 chg open-drain charge indicator. this pin is low during charging, is high after battery full or termination, 4 mod usb input enable pin. active high. used to reduce charge current when usb is the supply. 5 gnd, exposed pad ground. exposed pad must be connected to gnd plane. 6 shdn charger ic enable. an input ?low? signal at this pin or if the pin is floating will enable the ic. an input ?high? will disable the ic. 7 ibf charge status threshold program. connect this pin to an external resistor to program the charge termination current or battery full indication threshold. i bf =1.7/rbf 8 iset1 usb constant charge current program pin. co nnect this pin to an external resistor to program the charging current in cc mode. i chg =1.7/rset1 when mod=high 9 iset2 additional constant charge current program pin for ac input. connect this pin to an external resistor to program the charging current in ac mode. i chg =1.7/(rset1// rset2) when mod=low 10 batt charger output.
MP26056- 28v, li+single-cell battery charger with usb/ac-adapter input MP26056 rev. 0.91 www.monolithicpower.com 5 3/30/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. typical performance curves c in =4.7uf, c out =2.2uf, v in =5v, t a =25oc, unless otherwise noted. i_v charge curve v in = 5v shut down current v shdn =2.8v r set resistance vs. i set constant current charge v bat = 3.8v usb input charge curve constant voltage charge battery sink current v in = gnd i chg (ma) i chg (ma) i chg (ma) i set (ma) i chg (ma) i in (ua) i chg (ma) i bat (ua) v bat (v) v status (v) v bat (v) v status (v) time (min) time (min) v bat ( v ) v bat ( v ) v bat ( v ) v in ( v ) v in ( v ) ac adapter input charge curve 0 100 200 300 400 500 600 700 800 900 0 40 80 120 160 200 0. 0 0. 5 1. 0 1. 5 2. 0 2. 5 3. 0 3. 5 4. 0 4. 5 v bat v status i chg i chg 0 50 10 0 15 0 200 250 300 350 400 450 0306090120150180 0.0 0.5 1. 0 1. 5 2.0 2.5 3.0 3.5 4.0 4.5 v bat v status 4. 170 4. 180 4. 190 4. 200 4. 210 4. 220 0 200 400 600 800 1000 i chg =0.8a i chg =0.5a i chg =0.2a 0 200 400 600 800 1000 1. 0 1. 7 2. 4 3. 1 3. 8 4. 5 i chg =0.2a i chg =0.8a i chg =0.5a 4. 0 4. 5 5. 0 5. 5 6. 0 6. 5 7. 0 0 200 400 600 800 1000 1200 4. 0 4. 5 5. 0 5. 5 6. 0 6. 5 7. 0 i chg =0.8a i chg =0.5a i chg =0.2a dropout thermal protection 0 0. 3 0. 6 0. 9 1. 2 1. 5 2. 0 2. 5 3. 0 3. 5 4. 0 4. 5 0 8 16 24 32 40 4. 0 4. 5 5. 0 5. 5 6. 0 6. 5 7. 0 1/r set 0. 0 0. 1 0. 2 0. 3 0. 4 0. 5 0. 6 0 200 400 600 800 1000
MP26056- 28v, li+single-cell battery charger with usb/ac-adapter input MP26056 rev. 0.91 www.monolithicpower.com 6 3/30/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. typical performance curves (continued) c in =4.7uf, c out =2.2uf, v in =5v, t a =25oc, unless otherwise noted. v in 5v/div. v sd 2v/div. v bat 5v/div. i chg 0.5a/div. v in 5v/div. v sd 2v/div. v bat 5v/div. i chg 0.5a/div. v in 5v/div. v chg 5v/div. v bat 2v/div. i chg 0.5a/div. 4ms/div. v in 5v/div. v chg 5v/div. v bat 2v/div. i chg 0.5a/div. 20ms/div. 20ms/div. 2ms/div. v in 5v/div. v chg 5v/div. v bat 2v/div. i chg 0.1a/div. v in 5v/div. v chg 5v/div. v bat 2v/div. i chg 0.2a/div. v sd =0.78v v sd =2.44v i chg (ma) 520 530 540 550 560 570 -40 -10 20 50 80 110 4.150 4.170 4.190 4.210 4.230 4.250 -40 -10 20 50 80 110 v bat (v) constant voltage charge vs. temp v in =5v,i chg =60ma 200 400 600 800 10 0 0 12 0 0 1.0 2.0 3.0 4.0 5.0 6.0 i chg (ma) v ce ( v ) thermal protection v ce =v in -v bat
MP26056- 28v, li+single-cell battery charger with usb/ac-adapter input MP26056 rev. 0.91 www.monolithicpower.com 7 3/30/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. block diagram battery charge control 7 9 4 1 10 3 2 5 6 mod ibf iset2 iset1 shdn r bf 8 r set1 r set2 in batt chg 8.2v 8.2v acok gnd en v in c in c out v batt + _ off on i batt figure 1?functional block diagram operation input voltage range the MP26056 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 3.0 or higher than 7.0v. the open- drain pin acok is used to indicate an input power good condition (i.e. 3.5vMP26056. the MP26056 will start with the constant current charge of the programmed value (i chg ) based on r setx . 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 , but the charger keeps charging the battery until battery reach 4.2v when ac adaptor is used as supply. if usb is used as supply, please refer to the follow section for auto recharge operation. v bat usb input i bf i bat i bf 4.2v c.v charging ac adapter input figure 2?MP26056 typical charging profile
MP26056- 28v, li+single-cell battery charger with usb/ac-adapter input MP26056 rev. 0.91 www.monolithicpower.com 8 3/30/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. charge status indicator (chg) the MP26056 has an integrated charge status pin that remains low while the battery is charging. once the charge current has reduced to the battery full charge current threshold (i bf ), the chg pin will become high impedance. 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 end user. a simple solution is to add a rc filter on the chg pin to filter out the possible chg glitch, as show in figure 3. shdn 6 iset2 9 in 1 ib f 7 mod 4 acok 3 chg 2 gnd 5 iset1 8 bat 10 MP26056 r1 vin shdn r2 chg acok c4 c1 c2 ns r4 r3 c6 vbat mod r5 r6 figure 3?filtered charge status with gpio connection
MP26056- 28v, li+single-cell battery charger with usb/ac-adapter input MP26056 rev. 0.91 www.monolithicpower.com 9 3/30/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. charge termination in usb mode 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 current will be turned off. the battery voltage may decay after termination due to self discharge or system draw current from the battery. automatic recharge in usb mode 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 is unplugged or the charger is disabled and/or terminated, the leakage current from the battery to MP26056 is less than 1ua. programming of charge current and battery full current the charge current (i chg ) is set by resistors (r setx ) connecting from the i setx pin to gnd. the relationship of the charge current and the programming resistance is established by following equations. chg set1 1ax1.7k i r ? = (mod= high, for usb) chg set1 set2 1a x1 . 7k i r//r ? = (mod=low, for ac adapter) it is highly recommended to program the charge current within 0.2a to 1a. the battery full charge current threshold (i bf ) is programmed by connecting a resistor r bf from the ibf pin to gnd: bf bf 1a 1.7k i r ? = the selection of r bf value should meet the condition, 0.1i chg < i bf < 0.6 i chg. 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 a floating. thermal protection the MP26056 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.
MP26056- 28v, li+single-cell battery charger with usb/ac-adapter input MP26056 rev. 0.91 www.monolithicpower.com 10 3/30/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. application MP26056 flow chart power-on reset (por) feature can be applied to the MP26056 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 MP26056 cvc and ccc stand for ?constant voltage charge? and ?constant current charge?, respectively. v in >v uvlo ? por no yes which charge mode? v bat >4.18v v bat <4.18v t j >130 c ? short circuit? v bat >4.18v? i chg MP26056- 28v, li+single-cell battery charger with usb/ac-adapter input 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. MP26056 rev. 0.91 www.monolithicpower.com 11 3/30/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 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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