mp26023 28v, 1a linear li-ion battery charger with trickle charge mp26023 rev.0.9 www.monolithicpower.com 1 12/14/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. the future of analog ic technology description the mp26023 is a linear, high-performance single cell li-ion battery charger. by integrating high voltage input protection into the charger ic, the mp26023 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, battery temperature monitoring, reverse current blocking and trickle charge. the device also provides ac adapter power good and charge status indications to the system. mp26023 is available in 10-pin 3mm x 3mm qfn packages. 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 ? battery temperature monitoring ? 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 players ? smart phones ? pdas ? digital cameras ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application mp26023 batt iset ibf ss gnd 10 9 8 7 6 in chg acok en ntc 1 2 3 4 5 c in 1uf 430 ? r1 500k ? 430 ? r ntc 100k ? c ss 0.1uf c out 1uf - 22uf to system i batt v batt + _ r bf 20k ? r chg 2.3k ? 3.5v - 28v off on
mp26023 ? 28v, 1a linear li-ion battery charger with trickle charge mp26023 rev.0.9 www.monolithicpower.com 2 12/14/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. ordering information part number* package top marking free air temperature (t a ) MP26023DQ qfn10 (3mm x 3mm) 2uyw ?40 c to +85 c * for tape & reel, add suffix ?z (e.g. MP26023DQ?z). for rohs compliant packaging, add suffix ?lf (e.g. MP26023DQ?lf?z) package reference absolute maxi mum ratings (1) in to gnd ....................................?0.3v to +28v all other pins to gnd .................?0.3v to +6.5v continuous power dissipation (t a = +25c) (2) ??????????????????....2.5w junction temperature ...............................140 c lead temperature ....................................260 c storage temperature.............. ?65c to +150 c recommended operating conditions (3) nominal supply voltage v in ............3.5v to 5.5v operating junct. temp (t j ) ..... -40c to +125c thermal resistance (4) ja jc qfn10 (3mm x 3mm) .............50 ...... 12 ... c/w notes: 1) exceeding these ratings may damage the device. 2) the maximum allowable power dissipation is a function of the maximum junction temperature t j (max), the junction-to- ambient thermal resistance ja , and the ambient temperature t a . the maximum allowable continuous power dissipation at any ambient temperature is calculated by p d (max) = (t j (max)-t a )/ ja . exceeding the maximum allowable powe r dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. internal thermal shutdown circuitry protects the device from permanent damage. 3) the device is not guaranteed to function outside of its operating conditions. 4) measured on jesd51-7, 4-layer pcb. top view in chg acok en ntc 1 2 3 4 5 batt iset ibf ss gnd 10 9 8 7 6 exposed pad on backside
mp26023 ? 28v, 1a linear li-ion battery charger with trickle charge mp26023 rev.0.9 www.monolithicpower.com 3 12/14/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. 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 battery voltage regulation v batt t a = ?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 = 1.6 k ? to 8.0 k ? 87 100 113 %i chg (5) trickle current v in = 5v, v batt = 2.3v 5 10 15 %i chg (5) trickle threshold voltage 2.85 3.0 3.15 v trickle voltage hysteresis 230 mv battery full programming range i bf refer to operation section for programming i bf 10 50 %i chg (5) ibf accuracy 75 125 %i bf (6) ss pin voltage c ss = 0.1uf, v batt = 3.6v 1.19 1.23 1.27 v input acok up range 5.8 6.0 6.2 v input acok low range 1.8 2.5 3.2 v input over voltage protection ovp v in rising 5.8 6.0 6.2 v ovp hysteresis 400 mv en trip threshold high 2.7 v en trip threshold low 0.4 v 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 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 from trickle to 90% of full current, c ss = 0.1f 10 20 35 ms notes: 5) i chg is the target preprogrammed charge current (die temperature below 110c). 6) i bf is the target preprogrammed battery full current threshold.
mp26023 ? 28v, 1a linear li-ion battery charger with trickle charge mp26023 rev.0.9 www.monolithicpower.com 4 12/14/2009 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 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 ntc negative thermal coefficient (ntc) 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. 6 gnd ground. 7 ss soft-start timer. connect this pin to an external capacitor to program t he soft-start startup time using the equation: sec m 20 f 1 . 0 c t ss ss = . 8 ibf 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.
mp26023 ? 28v, 1a linear li-ion battery charger with trickle charge mp26023 rev.0.9 www.monolithicpower.com 5 12/14/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. typical performanc e characteristics v in = 5v, c in = 10f, c out = 4.7f, t a = +25 c, unless otherwise noted. 4.5 4.3 4.1 3.9 3.7 3.5 battery voltage (v) 4.5 4.8 5.1 5.4 5.8 6.0 input voltage (v) battery voltage vs input voltage i chg =0.43a 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 charge current (a) battery voltage (a) 0 40 80 120 160 200 charge time (minutes) battery charge curve v batt i batt charge current (a) battery voltage (v) charge currents vs battery voltage charge current (a) battery voltage (v) charge current vs battery voltage 0 0.2 0.4 0.6 0.8 1 1.2 012345 0 0.2 0.4 0.6 0.8 1 1.2 3 3.2 3.4 3.6 3.8 4 v in 5v/div. v batt 2v/div. i batt 0.5a/div. v in 5v/div. v batt 2v/div. i batt 0.5a/div. 2ms/div. v en 5v/div. v en 5v/div.
mp26023 ? 28v, 1a linear li-ion battery charger with trickle charge mp26023 rev.0.9 www.monolithicpower.com 6 12/14/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. typical performanc e characteristics (continued) v in = 5v, c in = 10f, c out = 4.7f, t a = +25 c, unless otherwise noted. charge current (ma) input voltage (v) 500 540 580 620 660 700 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5 v bat =3.7v v bat =3.8v 400 350 300 250 200 150 100 50 0 4.5 4.8 5.1 5.4 5.8 6.0 input voltage (v) r ntc vs. input voltage t high t low charge current (ma) battery voltage (v) 16 14 12 10 8 6 4 2 0 0 200 400 600 800 1000 charge current (ma) charge current vs. r chg resistance battery voltage vs. temperature reverse current ( a) 2.5 2.9 3.3 3.7 4.1 4.5 battery voltage (v) reverse current vs. battery voltage 0 0.01 0.02 v in =0v 500 520 540 560 580 600 620 640 -50 -30 -10 10 30 50 70 90 4 4.05 4.1 4.15 4.2 4.25 4.3 -50 -30 -10 10 30 50 70 90
mp26023 ? 28v, 1a linear li-ion battery charger with trickle charge mp26023 rev.0.9 www.monolithicpower.com 7 12/14/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. block diagram battery charge control 7 9 8 5 1 10 2 3 6 4 ss iset ibf ntc r ntc c ss r chg r bf r1 in batt chg 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 mp26023 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 6.0v. the open-drain pin acok is used to indicate an input power good condition (i.e. 2.5v cc-> cv) figure 2 below shows the typical charging profile for the mp26023. figure 3 shows the typical charging procedure. for a fully depleted battery with a terminal voltage lower than 3.0v, the mp26023 will start with the trickle charge (preconditioning) at 10% of the programmed full charge current. after the battery voltage reaches 3.0v, 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 in the cv mode is reduced to the programmed full battery current (i bf ).
mp26023 ? 28v, 1a linear li-ion battery charger with trickle charge mp26023 rev.0.9 www.monolithicpower.com 8 12/14/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. 3.0v 4.2v v batt 10% of i chg i bf trickle charging cc charging charging complete cv charging i chg i batt figure 2?mp26023 typical charging profile trickle charging charge start charge end soft-start time cc mode cv mode 10% of i chg (i bf ) 90% of i chg i chg 3.0v 4.2v v batt v batt i batt i batt chg figure 3?mp26023 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 mp26023 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) 1.65 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 chg 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 4?charge current vs. 1/r chg resistance the recommended resistance for programming the charge current is 2.3k ? mp26023 ? 28v, 1a linear li-ion battery charger with trickle charge mp26023 rev.0.9 www.monolithicpower.com 9 12/14/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. charge status indicator (chg) the mp26023 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 shown in figure 5. negative thermal coefficient (ntc) thermistor the mp26023 has a built-in ntc resistance window comparator. if configured as the typical application circuit as indicated in figure 1, the mp26023 will cease charging if r ntc <32.3k ? or r ntc >376.6k ? . this represents a valid charging temperature range of 0c to 50c for the th11-4h104f ntc resistor. thermal protection the mp26023 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 effectivel y prevent the ic from going into thermal protection mode. mp26023 batt iset ibf ss gnd 10 9 8 7 6 in chg acok en ntc 1 2 3 4 5 jp4 jp1 jp2 jp3 vin bat gnd gnd chg acok en ntc figure 5?filtered charge status with gpio connection
mp26023 ? 28v, 1a linear li-ion battery charger with trickle charge mp26023 rev.0.9 www.monolithicpower.com 10 12/14/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. application flow chart of operation power-on reset (por) feature can be applied to the mp26023 to ensure that the device starts operating in a known state. the flow chart in figure 5 describes the conditions and operation modes of the mp26023. cvc and ccc stand for ?constant voltage charge? and ?constant current charge?, respectively. j figure 6?flow chart of operation
mp26023 ? 28v, 1a linear li-ion battery charger with 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. mp26023 rev.0.9 www.monolithicpower.com 11 12/14/2009 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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