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MP2608 28v, 1a dual input linear battery charger with timer MP2608 rev. 0.9 www.monolithicpower.com 1 8/29/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. the future of analog ic technology description the MP2608 is a dual-input, linear, high-performance low-cost single cell li-ion or li-polymer battery charger. it accepts two power inputs, one from a usb (universal bus) port and the other from an ac adapter. by integrating high voltage input protection into the charger ic, the MP2608 can tolerate an input surge up to 28v. due to the protection inputs function, low-cost, large output tolerance adapters can be used safely. the device features constant current (cc) and constant voltage (cv) charging modes with programmable charge currents (100ma to 1.0a), current blocking and trickle charge. the charge current for adapter input can be programmed by an external resistor, while the charge current for usb input is pre-set at 450ma.the device also provides charge status and fault indications to the system. for guaranteed safe operation, the MP2608 folds back charge current when the device is heated up due to limited pcb space. other safety features are including battery temperature monitoring, and programmable timer to complete the charging cycle. MP2608 is available in a 10-pin 3mm x 3mm qfn package. features ? complete solution for charging single-cell lion-ion battery ? input surge up to 28v ? adapter and usb input ? programmable charge current: 100ma to 1.0a ? pre-set usb charge current: 450ma ? proprietary constant voltage auto recharge ? proprietary over-voltage protection ? 0.75% v batt accuracy over temperature ? <1a battery reverse current ? 125a standby current from v in ? battery temperature monitoring ? thermal protection ? fault and charge status indicators ? internal soft-start ? 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 to system batt fault status in usb shdn ichg ibf tmr gnd to ac adapter c1 c2 c3 r1 r4 r2 r3 d2 d1 MP2608 c4 to usb
MP2608- 28v, 1a dual input linear battery charger with timer MP2608 rev. 0.9 www.monolithicpower.com 2 8/29/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. package reference top view in usb fault shdn 1 2 3 4 5 10 9 8 7 6 status batt ichg gnd tmr ibf exposed pad on backside part number* package temperature MP2608dq qfn10 (3mm x 3mm) ?40 c to +85 c * for tape & reel, add suffix ?z (eg. MP2608dq?z) for rohs compliant packaging, add suffix ?lf (eg. MP2608dq?lf?z) absolute maxi mum ratings (1) in, usb 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 = 5v, v en = 0v, t a = +25 c, unless otherwise noted. parameter symbol condition min typ max units in, usb input voltage v in, v usb 4.5 28 v in, usb input under- voltage threshold v in-uv in input rising 3.75 4 4.25 v in, usb input over- voltage threshold v in-ov in input rising 5.8 6.0 6.2 v shdn= low and batt floating 100 supply current i supply shdn = high and batt floating 80 a charger t = +25c, i batt = 0 4.179 4.200 4.221 t = 0c to +50c, i batt = 0 4.168 4.200 4.232 battery voltage regulation v batt t = ?5c to +75c, i batt = 0 4.158 4.200 4.242 v battery over-voltage protection i batt_ovp v batt = 4.25v 0 a i chg,in v in = 5v, v batt = 3.8v r chg = 2.3k ? 640 708 780 ma constant current regulation i chg,usb v in =0v, v usb = 5v, v batt =3.8v 410 450 490 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)
MP2608- 28v, 1a dual input linear battery charger with timer MP2608 rev. 0.9 www.monolithicpower.com 3 8/29/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 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 v drop,in v in , =4v, r chg = 1.5k ? , 1a load on the batt pin 130 mv pass device drop-out voltage v drop,usb v usb = 4v, 400ma load on the batt pin 152 mv trickle current v in = 5v, v batt = 2.3v 5 10 15 %i chg (4) ibf accuracy -20 +20 %ibf trickle threshold voltage 2.5 2.6 2.7 v trickle voltage hysteresis 100 mv shdn trip high threshold 2.0 v shdn trip low threshold 0.4 v shdn pull-down resistor 500 k ? fault , status sink current pin voltage = 0.4v 4 ma battery reverse current to batt pin shdn = high and input = floating or 0v 1 a thermal shutdown threshold 105 120 135 c thermal shutdown hysteresis 10 c recharge threshold recharge voltage threshold v rechg 4.0 v oscillator oscillator period t osc c time = 15nf 4.8 6.0 7.2 ms timeout period t timeout 2 15 t osc notes: 4) i chg is the target preprogrammed charge current (die temperature below 110c).
MP2608- 28v, 1a dual input linear battery charger with timer MP2608 rev. 0.9 www.monolithicpower.com 4 8/29/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. pin functions pin # name description 1 in input supply. in receives the ac adapter supply voltage. 2 usb input supply. usb receives the usb supply voltage. 3 fault open-drain fault status indicator. this pin is low under any fault conditions. 4 status open-drain charge indicator. this pin is low during charging. 5 shdn charger ic shut-down. pull shdn high to disable the ic or leave it floating to enable the ic. 6 ibf programmable input for end of charger current. 7 tmr oscillator period timer. connect a timing capacitor between this pin and gnd to set the oscillator period. a 1uf capacitor on the tmr pi n will make the oscillator period 400ms. 8 gnd ground. exposed pad and gnd must connect to same ground plane. 9 ichg constant charge current program for the in input. connect this pin to an external resistor to program the charging current in cc mode when the current from the in pin charges the battery. 10 batt charger output.
MP2608- 28v, 1a dual input linear battery charger with timer MP2608 rev. 0.9 www.monolithicpower.com 5 8/29/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. typical performanc e characteristics v in =5v, c in =2.2uf, c out =1uf, r chg =2.21k ? , t a =25 c , unless otherwise noted. input voltage (v) input voltage (v) 020 80 40 60 0 50 200 100 150 0 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.50 0.45 charge time (minutes) charge time (minutes) battery charge curve battery charge curve 0.1 0 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 charge current(a) charge current(a) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 charge current vs. battery voltage 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 charge current (a) battery voltage vs. input voltage 3.5 3.7 3.9 4.1 4.3 4.5 4.5 4.8 5.1 5.4 5.7 6 adapater in usb in charge current vs. battery voltage 0 100 200 300 400 500 600 700 800 900 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 battery voltage (v) charge current(ma) charge current(ma) charge current vs. input voltage 0 200 400 600 800 1000 1200 4 4.3 4.6 4.9 5.2 5.5 5.8 adapater in usb in charge current vs. r set resistance 0 200 400 600 800 1000 1200 0 5 10 15 20 charge current (ma) r set resistance reverse current vs. battery voltage 0 0.1 0.2 0.3 0.4 0.5 1.5 2.0 2.5 3.0 3.5 4.0 4.5
MP2608- 28v, 1a dual input linear battery charger with timer MP2608 rev. 0.9 www.monolithicpower.com 6 8/29/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. typical performanc e characteristics (continued) v in =5v, c in =2.2uf, c out =1uf, r chg =2.21k ? , t a =25 c , unless otherwise noted. startup with sd (adapter in) shutdown with sd (adapter in) shutdown with sd (usb in) startup with sd (usb in) power off (adapter in) power off (usb in) v in 2v/div v batt 2v/div v status 2v/div i batt 500ma/div v in 2v/div v batt 2v/div v status 2v/div i batt 500ma/div v sd 2v/div v batt 2v/div v status 2v/div i batt 500ma/div v sd 2v/div v batt 2v/div v status 2v/div i batt 500ma/div v sd 2v/div v batt 2v/div v status 2v/div i batt 500ma/div v sd 2v/div v batt 2v/div v status 2v/div i batt 500ma/div v in 2v/div v batt 2v/div v status 2v/div i batt 500ma/div v in 2v/div v batt 2v/div v status 2v/div i batt 500ma/div 4ms/div 10ms/div 10ms/div 4ms/div 4ms/div 2ms/div power on (adapter in) power on (usb in)
MP2608- 28v, 1a dual input linear battery charger with timer MP2608 rev. 0.9 www.monolithicpower.com 7 8/29/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. typical performanc e characteristics (continued) v in =5v, c in =2.2uf, c out =1uf, r chg =2.21k ? , t a =25c, unless otherwise noted.
MP2608- 28v, 1a dual input linear battery charger with timer MP2608 rev. 0.9 www.monolithicpower.com 8 8/29/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. block diagram in batt shdn fault status + - + - vth sd control logic v ov p osc tmr + - v uvlo uv in ov in thermal shutdown timer charging current control ichg usb die temp + - rechg 4.1v + - trickle 2.5v gnd + - + - mux 1.23v ifb1 ifb2 vfb vfb ov in uv in ifb2 ifb1 figure 1?functional block diagram
MP2608- 28v, 1a dual input linear battery charger with timer MP2608 rev. 0.9 www.monolithicpower.com 9 8/29/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. operation input auto selection and voltage range the MP2608 is a dual-input charger, when both input sources are present, MP2608 selects only one power source to charge the battery. when the adapter input voltage is higher than the uvlo threshold, in is selected as the power source. otherwise the usb input is selected. if both the inputs is above uvlo but the adaptor input voltage is below the battery voltage, while the usb voltage is higher than the battery voltage, then the usb input is used to charge the battery. in case there is no power source available or both the two input are below the uvlo, the MP2608 is in the sleep mode, in which the current into the batt pin is reduced to tbd a. the ic is also disabled to prevent the battery from draining. the MP2608 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. charge cycle (mode change: trickle -> cc-> cv) figure 2 below shows the typical charging profile for the MP2608. for a fully depleted battery with a terminal voltage lower than 2.6v, the MP2608 will start with the trickle charge (preconditioning) at 10% of the programmed full charge current. after the battery voltage reaches 2.6v, the charger begins charging at the constant current of the programmed value (i chg ) and the charge timer starts counting down. 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 timer is time off. the charge timer is to protect the system from charging a dead battery for excessive long time. power dissipation timer charge end cv mode cc mode trickle charging charge start i batt v batt v in v ch v min i set 10% of i set figure 2?MP2608 typical charging profile charge termination and auto-recharge at any time when v batt is 50mv higher than the trimmed charge target, the MP2608 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. upon v batt drops to 4.0v, the charger will automatically restart the charge cycle until the end of the timeout. when the input adapter is unplugged, there is only 1a leakage current from battery drawn by the MP2608. programming of charge current and battery full current the charge current (i chg ) of adaptor input can be programmed from 0.1a to 1a by a resistor (r chg ) connecting from the ichg pin to gnd. the relationship of the charge current and the programming resistance is established by the following table and graph. the recommended resistance for programming the charge current is tbd . the battery full charge current threshold (i bf )is programmed by connecting a resistor r bf from the i bf pin to gnd: i bf =1ax1.7k ? /r bf when the usb is selected as the power source, the charge current is fixed at a pre-set value 450ma, which is a typical value of usb current.
MP2608- 28v, 1a dual input linear battery charger with timer MP2608 rev. 0.9 www.monolithicpower.com 10 8/29/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. table 1?r chg and i chg relationship r chg (k ? ) i chg (ma) tbd tbd figure 3?charge current vs. 1/rpgm resistance v in status por threshold fault 15 cycles to 1/8 timeout v batt v min v recharge i min t 0 t 1 t 2 t 3 t 4 t 5 t 6 t 7 2.6v 15 cycles i charge figure 4?MP2608 typical re-charging waveforms charge status and fault indication the open drain pin status is used to indicate charging status. while battery is being charged, the status pin is pulled low, when the battery full condition is reached or any other condition prevents the charger from charging, the status pin will become a floating. status is then latched till a new charge cycle is started. upon a time-out fault event happen, the fault pin is pulled low. when the v batt is lower than 2.6v for 1/8 th of timeout period or the charging can not reach eoc status before the timeout happens, this fault status is latched, the charging is suspended, and the fault pin is pulled low. to clear this fault, either the v in or v usb should be recycled. one time-out period is equivalent to 2 15 oscillator clock cycles. with a 1 f capacitor on the tmr pin, it takes 3.64 hours. the power on and recharge cycle are illustrated in figure 4.
MP2608- 28v, 1a dual input linear battery charger with timer MP2608 rev. 0.9 www.monolithicpower.com 11 8/29/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. state diagram vin por and battery inserted and vbat vin and en high trickle charge fault fast charge fault vbatt v trk before 1/8th timeout end of charge (vbatt v ibatt imin) termination timeout vbatt v rech temp fault status temp fault removed timeout fault vbatt v trk for 1/8th timeout stop temp fault temp fault por or vin or low temp fault temp fault removed temp fault temp fault . figure 5?MP2608 state diagram
MP2608- 28v, 1a dual input linear battery charger with timer 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. MP2608 rev. 0.9 www.monolithicpower.com 12 8/29/2008 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

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