mp2606 single-cell 1a linear li-ion battery charger without trickle charge mp2606 rev. 1.0 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 mp2606 is a linear, high-performance single cell li-ion battery charger. by integrating high voltage input protection into the charger ic, the mp2606 can tolerate an input surge up to 28v. the device features constant current (cc) and constant voltage (cv) charging modes with programmable charge currents (85ma to 1a), programmable battery full threshold, thermal protection and reverse current blocking. the device also provides ac adapter power good and charge status indications to the system. mp2606 is available in 10-pin 3mm x 3mm qfn package. evaluation board reference board number dimensions ev2606dq-00a 2.0? x 1.9? x 0.6? features ? input surge up to 28v ? adapter or usb input ? programmable charge current: 85ma to 1a ? proprietary constant voltage auto recharge ? proprietary over-voltage protection ? 0.75% v batt accuracy ? <1a battery reverse current ? 90a standby current from v in ? over current protection ? ac adapter power good indicator ? charge status indicator ? programmable soft-start ? programmable charge termination current threshold ? tiny 3mm x 3mm qfn package applications ? cell phones ? mp3/multimedia players ? smart phones ? pdas ? digital cameras ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application mp2606 batt iset en ss gnd 10 9 4 7 6 in vin gnd en chg acok ibfh ibfl 1 2 3 5 8 i batt led1 green led2 red bat jp4 gnd jp1 jp2 jp3
mp2606 ? single cell 1a linear li-ion battery charger w/o trickle charge mp2606 rev. 1.0 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 chg acok en ibfh 1 2 3 4 5 batt iset ibfl ss gnd 10 9 8 7 6 exposed pad on backside part number* package temperature MP2606DQ qfn10 (3mm x 3mm) ?40 c to +85 c * for tape & reel, add suffix ?z (e.g. MP2606DQ?z) for rohs compliant packaging, add suffix ?lf (e.g. MP2606DQ?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 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. electrical characteristics v in = 5v, v en = 0v, t a = +25 c, unless otherwise noted. parameter symbol condition min typ max units en = high 40 supply current i supply en = low, i chg = 0a 500 a t = +25c, i batt = 0 4.179 4.20 4.221 t = 0c to +50c, i batt = 0 4.168 4.20 4.232 battery voltage regulation v batt t = ?5c to +75c, i batt = 0 4.158 4.20 4.242 v battery over-voltage protection i batt_ovp v batt = 4.25v 0 a constant current regulation i chg v in = 5v, v batt = 3.8v r chg = 3.3k ? 450 515 580 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) 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) ss pin voltage c ss = 0.1uf, v batt = 3.6v 1.19 1.23 1.27 v input acok up range 6.8 7.0 7.2 v input acok low range 1.8 2.5 3.2 v en trip threshold high 2.0 v en trip threshold low 0.4 v
mp2606 ? single cell 1a linear li-ion battery charger w/o trickle charge mp2606 rev. 1.0 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 en = 0v, t a = +25 c, unless otherwise noted. parameter symbol condition min typ max units chg , acok sink current pin voltage = 0.4v 8 ma battery reverse current to batt pin en = low and input = floating or 0v 1 a tbd tbd switch-on resistance r on v batt = 3.8v, i batt = 300ma, r chg = 1.7k ? 0.35 ? soft thermal shutdown threshold 105 120 135 c soft thermal shutdown hysteresis 10 c soft-start time c ss = 0.1f 10 20 35 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. pin functions pin # name description 1 in input supply pin. in receives the ac adapter or usb supply voltage. 2 chg open-drain charge status indicator. this pin is low during charging. 3 acok open-drain input acok indicator. this pin is lo w if the voltage at the in pin is between 2.5v and 6v. 4 en charger ic enable. an input ?low? signal at this pin or if the pin is floating will enable the ic. 5 ibfh change status hysteresis progr am pin. (see the formular on page 7) 6 gnd ground. 7 ss soft-start timer. connect this pin to an external capacitor to pr ogram the soft-start startup time using the equation: sec m 20 f 1 . 0 c t ss ss = . 8 ibfl charge status threshold program. connect this pin to an external resistor to program the charge termination current or battery full charge current. 9 iset constant charge current program. connect this pin to an external resistor to program the charging current in cc mode. 10 batt charger output.
mp2606 ? single cell 1a linear li-ion battery charger w/o trickle charge mp2606 rev. 1.0 www.monolithicpower.com 4 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, t a = +25 c, unless otherwise noted. disabled supply current (ua) 0 20 40 60 80 100 4 8 12 16 20 24 28 input voltage (v) disabled- mode supply current vs. input voltage reverse current(ua) 2.5 2.9 3.3 4.1 4.5 3.7 battery voltage (v) reverse current vs. battery voltage charge current setting input voltage (v) constant current mode charging 300 250 200 150 100 50 0 4.18 4.185 4.19 charge current (ma) charge voltage vs r chg resistance 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0 5 10 15 20 0 200 400 600 800 1000 i chg current (ma) i chg current (ma) battery full current setting i bfl current (ma) 10 20 30 40 50 60 0 80 120 160 200 40 0 200 400 600 800 1000 4.2 4.6 5.0 5.4 5.8 v bat =3.8v 800ma 500ma 200ma- 800ma 500ma 200ma charge current(ma) r chg r bfl
mp2606 ? single cell 1a linear li-ion battery charger w/o trickle charge mp2606 rev. 1.0 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 (continued) v in = 5v, c in = 4.7f, c out = 2.2f, t a = +25 c, unless otherwise noted. 0 1 2 34 5 battery voltage (v) 800ma charge current vs. battery voltage 0 200 400 600 800 1000 charge current (ma) 500ma 200ma -40 -20 0 20 40 60 80 0 200 400 600 800 1000 charge current (ma) v bat =4v v bat =3.6v -40 -20 0 20 40 60 80 0 100 200 300 400 500 600 charge current (ma) v bat =4v v bat =3.6v 4.17 4.175 4.18 4.185 4.19 4.195 4.2 -40 -20 0 20 40 60 80 battery regulation voltage (v) i chg = 0 -40 -20 0 20 40 60 80 0 50 100 150 200 250 charge current (ma) v bat =4v v bat =3.6v
mp2606 ? single cell 1a linear li-ion battery charger w/o trickle charge mp2606 rev. 1.0 www.monolithicpower.com 6 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. block diagram battery charge control 7 9 8 5 1 10 2 3 6 4 ss c ss r chg r bfl in batt chg acok gnd en v in c in c out v batt + _ off on i batt r bfh i bfh i bfl i set figure 1?functional block diagram operation input voltage range the mp2606 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 2.5v or higher than 7.0v. the open-drain pin acok is used to indicate an input power good condition (i.e. 2.5v cv) figure 2 below shows the typical charging profile for the mp2606. figure 3 shows the typical charging procedure. for a depleted battery the mp2606 will start with 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 in the cv mode is reduced to the programmed full battery current (i bfl ). after battery full is asserted, the output current needs to reach i bfh threshold to re-assert ?in-charge? status. the mp2606 can start up with heavy load and is stable without a battery connected to the batt pin.
mp2606 ? single cell 1a linear li-ion battery charger w/o trickle charge mp2606 rev. 1.0 www.monolithicpower.com 7 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. 2.6v 4.2v v batt 10% of i chg i bfl cc charging charging complete cv charging i chg i batt figure 2?mp2606 typical charging profile charge start charge end soft-start time cc mode cv mode 10% of i chg (i bfl ) 90% of i chg i chg 4.2v v batt v batt i batt i batt chg figure 3?mp2606 typical charging procedure battery over-voltage protection and automatic recharge at any time when v batt is 50mv higher than the trimmed charge target, the mp2606 reduces its charge current to 0a. this ensures the safety of the battery. also, the cv control loop always monitors the battery voltage such that it will automatically recharge the battery when it is depleted below the target level. 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) 1.82 913 2 835 2.16 778 2.5 677 3.32 521 4.32 410 5 357 7.5 236 8.45 208 10 176 charge current vs 1/r chg resistance 1000 900 800 700 600 500 400 300 200 i chg current (ma) 0.00 0.20 0.10 0.30 0.40 0.60 0.50 1/r chg 100 0 figure 4?charge current vs 1/r chg resistance the recommended resistance for programming the charge current is 2.3k ? mp2606 ? single cell 1a linear li-ion battery charger w/o trickle charge mp2606 rev. 1.0 www.monolithicpower.com 8 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. charge status indicator ( chg ) the mp2606 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 bfl ), the chg pin will become high impedance. thermal protection the mp2606 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. the frequency and amplitude of the saw-tooth current waveform can be altered by changing the capacitance value connected to the ss pin. 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.
mp2606 ? single cell 1a linear li-ion battery charger w/o trickle charge mp2606 rev. 1.0 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 mp2606 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 mp2606. cvc and ccc stand for ?constant voltage charge? and ?constant current charge?, respectively. charge mode? v bat >4.15v v bat 4.15v t j >120 ? short circuit? v bat 4.15v? v bat >4.2v? r bf set up yes yes no no no no no v chg . c.c.c soft start v uvlo mp2606 ? single cell 1a linear li-ion battery charger w/o trickle charge 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. mp2606 rev. 1.0 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
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