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mp26075 high efficiency cradle charger mp26075 rev. 1.01 www.monolithicpower.com 1 5/23/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. the future of analog ic technology description the mp26075 is a linear, high performance, and high efficiency single cell li-ion or li- polymer battery charger for ac adapter input in the plug-in, cradle charger applications. the device will control the ac adapter output voltage against the battery voltage to increases energy efficiency. additionally, mp26075 can provide very low pre-charge charge current for deep-discharged battery. for guaranteed safe operation, mp26075 controls power up sequencing. it ramps-up ac adapter firstly to limit inrush current when the adapter plug in. other safety feature includes battery temperature monitoring, charge time-out and fault indications, it also provides input/output over voltage protection and charge status indications. mp26075 is available in qfn 3x3mm package. features ? voltage control function for the fly-back controller ? high charge efficiency ? battery voltage options: 4.05v-4.20v. ? low current pre-charge mode ? controlled power-up sequencing ? battery temperature monitoring ? charge status indication ? auto-recharge ? fault indications ? internal timer ? input/output ovp ? over temperature protection applications ? cell phones ? portable music players ? smart phones ? pda ? digital cameras for mps green status, please visit mps website under quality assurance. ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application vin gnd ctl com tmr iset led-r led-g batt ntc mp26075 battery pack c out r ntc photo-coupler c in
mp26075 ? high efficiency cradle charger mp26075 rev. 1.01 www.monolithicpower.com 2 5/23/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. ordering information part number* battery voltage package top marking free air temperature (t a ) MP26075EQ 4.20v qfn10 (3x3mm) 8n ?20 ? c to +85 ? c MP26075EQ-41** 4.10v acc * for tape & reel, add suffix ?z (e.g. MP26075EQ?z); for rohs compliant packaging, add suffix ?lf (e.g. MP26075EQ?lf?z) ** mp26075 has several options with different battery voltages. please refer to the ordering information list. a nd contact factory for other battery voltages. package reference absolute maxi mum ratings (1) vin to gnd .................................. ?0.3v to +28v led-r and led-g maximum sink current .... 20ma 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) supply voltage v in .......................... 2.2v to 6.3v maximum junction temp. (t j ). .............. +125 ? c thermal resistance (4) ja jc 3x3 qfn10 ............................. 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 power 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 board.
mp26075 ? high efficiency cradle charger mp26075 rev. 1.01 www.monolithicpower.com 3 5/23/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. electrical characteristics (5) v in =5v (fast charge state not included), t a =-20c to +85c, typical values are at t a =+25c, unless otherwise noted. parameter symbol condition min typ max units battery voltage regulation 4.20v v batt t a =-5c to +75c i batt =0a 4.16 4.20 4.24 v 4.15v 4.11 4.15 4.19 4.10v 4.06 4.10 4.14 4.05v 4.01 4.05 4.09 constant current regulation i chg v in =5v,v batt =3.8v, r chg =1.7k 0.85 1 1.2 a constant current variation v in =5v,v batt =3.8v, t a =0c to 85c r chg =1.7k~8.0k 85 100 120 % trickle current regulation i chg v in =5v,v batt =2.5v r chg =1.7k 85 100 120 ma input voltage regulation v in when v batt <3v 5 v when v batt >3v, i chg >100ma v batt +0.5v v when v batt >3v, i chg <100ma 5 v v in -v batt during fast charge state v batt =3.8v 500 mv input uvlo threshold v in 1.5 2.0 2.5 v uvlo hysteresis 200 mv input ovp threshold v in 6.1 6.3 6.5 v input ovp hysteresis 500 mv output over voltage threshold v batt =4.2v v batt-ovp v in =4.85v 4.25 4.35 4.5 v v batt =4.1v v batt-ovp v in =4.85v 4.15 4.25 4.4 v battery pre-charge range v p re-char g e v in =5v 0 2.1 v battery trickle-charge threshold v tc-char g e v in =5v 2.1 v battery fast-charge threshold v fast-char g e v in =5v 3 v led red sink current pi n voltage=0.2v 8 ma led gree sink current pin voltage=0.2v 8 ma batt reverse current to batt pin v in = 0 or floating 2 a recharge voltage attenuate from v batt 8 %v batt ntc high threshold v ntc_high v in =5v 2.16 v ntc high trip hysteresis v in =5v 78 mv ntc low threshold v ntc_low v in =5v 0.37 v ntc low trip hysteresis v in =5v 30 mv timer frequency c tmr =0.1 f 7 hz die temperature limit (5) 120 c notes: 5) guaranteed by design
mp26075 ? high efficiency cradle charger mp26075 rev. 1.01 www.monolithicpower.com 4 5/23/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. pin functions pin # name description 1 vin input supply pin. decoupling capacito r is needed to prevent large voltage spikes. 2 led-g open-drain charge status indicator. this pin is high during charge and fault condition, is low after battery full or termination. 3 led-r open-drain charge status indicator. this pin is low during charge, is high after battery full or termination and fault condition. 4 tmr pin of the oscillator. connect a capacitor from this pin to gnd to set the oscillator cycle. timer setting time changes according to oscillation cycle. 5 gnd gnd pin. 6 com compensation for vin limits circuit. 7 ctl ctl is used for vin control. connect to t he cathode of photo diode of photo coupler by a resistor. 8 iset connect a resistor r between iset and gnd of battery pack to set the charge current. 9 ntc battery temperature monitoring pin. connect a resi stor from this pin to vin and connect this pin to the thermistor pin of the battery pack. 10 batt charger output terminal.
mp26075 ? high efficiency cradle charger mp26075 rev. 1.01 www.monolithicpower.com 5 5/23/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. typical performanc e characteristics test with ac_in=220v flyback, c in = 4.7 f, c out = 10 f, i chg = 1000ma, unless otherwise noted. v in &v batt (v) v in (v) 0 1 2 3 4 5 6 0 102030405060 time(min) 0 0.2 0.4 0.6 0.8 1 1.2 i batt (a) i batt (ma) i batt (ua) i chg (ma) battery current input voltage battery voltage real battery charge curve charge current vs battery voltage 0 200 400 600 800 1000 1200 1.5 2 2.5 3 3.5 4 4.5 v batt (v) v batt (v) v batt (v) i chg =1000ma i chg =600ma i chg =300ma charge input voltage vs battery voltage 1.5 2 2.5 3 3.5 4 4.5 battery reverse current i batt vs v batt curve v in =gnd, power source on batt 0 0.02 0.04 0.06 0.08 0.1 0.12 012345 r chg vs. i chg curve constant current charge, v batt =3.8v 0 200 400 600 800 1000 1200 0246810 i batt (ma) 0.5 0.51 0.52 0.53 0.54 0.55 0.56 0.57 0.58 0.59 0.6 0.61 cc charge current vs. temp constant current charge , v batt =3.8v i batt (ma) cc charge current vs. temp zoom in the junction temperature is too high. part enters thermal foldback mode 0 20 40 60 80 100 120 0246810 i chg (ma) r chg vs. i chg curve trickle charge, v batt =2.4v 3 3.5 4 4.5 5 5.5 20 40 60 80 100 120 140 -40 -10 20 50 80 110 140 700 800 900 1000 1100 1200 60 80 100 120 140 700 800 900 1000 1100 1200 t j t a t j t a
mp26075 ? high efficiency cradle charger mp26075 rev. 1.01 www.monolithicpower.com 6 5/23/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. typical performanc e characteristics (continued) test with ac_in=220v flyback, c in_charger = 4.7 f, c out_charger = 10 f, i chg = 1000ma, unless otherwise noted. v batt 2v/div. v in 2v/div. i batt 500ma/div. v batt 2v/div. v ntc 2v/div. v in 2v/div. i batt 1a/div. v batt 2v/div. v batt 2v/div. v in 2v/div. i batt 500ma/div. v batt 2v/div. v in 2v/div. i batt 500ma/div. v batt 2v/div. v tmr 500mv/div. v in 2v/div. i batt 50ma/div. led-r 2v/div. led-g 2v/div. i batt 200ma/div. 40 v. input power start up real battery, v batt =3.8v 2s/div. input power shut down real battery, v batt =3.8v 10 s/div. auto re-charge battery float v. ntc window control v batt =3.8v, cv load v ntc from 0v to 2.5v 100 s/div. input ovp entry open flyback loop, v batt =3.8v, v in from 5v to 7v v. timer out v batt =2.1v, c tmr =100pf
mp26075 ? high efficiency cradle charger mp26075 rev. 1.01 www.monolithicpower.com 7 5/23/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. block diagram + c in charge control adaptor over voltage detection adaptor under voltage detection thermal shutdown osc timer led-r led-g tmr iset iset vcc control ctl com ntc ntc gnd + battery batt vin figure 1? function block diagram
mp26075 ? high efficiency cradle charger mp26075 rev. 1.01 www.monolithicpower.com 8 5/23/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. operation the high-efficiency linear charger is mainly for plug-in, cradle charger applications. the device features using a photo-coupler to directly feedback the charge voltage and charge current information to the primary side. it is recommended to use with flyback controller for smooth system setup. figure 2 is the typical configuration for the charger with photo-coupler feedback to control the ac adapter. the voltage change of the ctl pin will be transferred to the comp pin of the ac adapter controller by the photo-coupler, which controls the conduction time of the primary side switch. the output voltage at secondary side of the transformer is then adjusted. emi filter+ rectifier fly-back controller vin gnd ctl com tmr iset led-r led-g batt ntc mp26075 ac input single cell battery c out r ntc photo-coupler comp figure 2? system configuration input voltage range the mp26075 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 2.2v or higher than 6.3v. if the input voltage is lower than the battery voltage, the ic is also disabled to prevent the battery from draining. the mp26075 includes a proprietary input reverse polarity circuit that eliminates the requirement for an external schottky diode. charge cycle (mode change: precharge-> trickle -> cc-> cv) figure 3 below shows the typical charge profile for the mp26075. for a fully depleted battery with a terminal voltage lower than 2.1v, the mp26075 will start with 1ma pre-charge. if the charger stays in the pre-charge mode longer than 512 cycles, led-r and led-g pins become high to indicate the battery fault, and the charge is terminated. and when battery voltage reaches 2.1v the mp26075 will start the trickle charge (preconditioning) at 10% of the full charge current based on the value of r chg . if the charger stays in the trickle mode longer than 16384 cycles, led-r and led-g pins become high to indicate battery fault, and the charge is terminated. after the battery voltage reaches 3.0v, the charger begins charge at the constant current of the programmed value (i chg ). this is referred to as the constant current (cc) mode. once the battery voltage reaches the battery regulation voltage (e.g.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 10% of the programmed constant current value (i chg ), and the charge process is terminated. recharge will start after the battery voltage is reduced to 8% of v batt . after 262144 cycles of continuous charge, if the battery is still not reaching 10% of i chg
mp26075 ? high efficiency cradle charger mp26075 rev. 1.01 www.monolithicpower.com 9 5/23/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. condition, the on-chip timer will terminate the charger to prevent charging the dead battery for excessive long time and the fault condition will be flagged by floating led-r and led-g pins. charge termination the charge current will gradually decrease in cv mode as the battery approaches full. the battery full threshold is internally programmed to be 10% of the i chg . when the charge current reaches this threshold, the charger ic will be automatically turned off. automatic recharge upon v batt drops to 8% of v batt , the charger will automatically restart the charge cycle until the 10% i chg condition is met again. when the input adapter is unplugged or the charger is disabled and/or terminated, the leakage current from the battery to mp26075 is less than 2 a. programming of charge 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 formula. 1400(a) (k) r 1.23v i chg chg ? ? timer operation the tmr pin is used to set the internal oscillator frequency, t=900000*ctmr (sec). the on-chip timer will start count down after initial power-up or every time being enabled. this timer will limit the max pre-charge time to 512 internal cycles and max trickle-charge time to 16384 internal oscillating cycles. if the charger stays in pre- charge mode for longer than 512 cycles or in trickle mode for longer than 16384 cycles, it will be terminated and a fault will be set by floating led-r and led-g pins. after fault reporting, the charger can be re-initiated only by recycling the power supply. if the charger successfully goes through trickle charge within the allowed time limit, it will start cc charge and then cv charge. if the total charge time exceeds 262144 cycles and the battery full has not been qualified, the charger will be terminated and a fault will also be set by floating led-r and led-g pins. this function prevents charging a dead battery for prolonged duration. the timer function can be disabled by shorting tmr pin to ground. table1? timer of each times item calculation formula 1ma charge timer tx512 trickle charge timer tx16384 total charge timer tx262144 negative thermal coefficient (ntc) thermistor the mp26075 has a built-in ntc resistance window comparator, which allows mp26075 to sense the battery temperature via the thermistor packed internally in the battery pack to ensure a safe operating environment of the battery. a resistor with appropriate value should be connected from vin to ntc pin and the thermistor is connected from ntc pin to gnd. the voltage on ntc pin depends on the ratio of the resistor divider. when the voltage of pin ntc falls out of the ntc window range, mp26075 will stop the charge. the charger will restart if the temperature goes back into the ntc window range. thermal protection the mp26075 has proprietary thermal protection to prevent the ic from overheating. when in thermal protection mode, the average charge current will be reduced to prevent the ic from overheating. operating in thermal protection mode will slow down the charge process. lowering the input voltage and enhancing thermal dissipation to the environment can effectively prevent the ic from going into thermal protection mode. status indication mp26075 has two open-drain status outputs: led-r and led_g. both led-r and led-g are used to indicate the status of the charge cycle. table 2 describes the status of the charge cycle based on the led-r and led_g outputs. the led-r and led_g pins pull high when any fault happens.
mp26075 ? high efficiency cradle charger mp26075 rev. 1.01 www.monolithicpower.com 10 5/23/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. table 2? charge status indication led-r led-g status high high fault/toggle low high normal charge high low end of charge compensation com pin is used to compensation vin control loop. connect a resistor and a capacitor between com pin and ctl pin to keep system?s stability. 100nf capacitor and several kilo-ohms resistor are recommended. and for specific design, please refer to application information of the primacy flyback controller. v cc 0v 5v batt+0.5v v batt recharge trickle charge detection cc charge detection 2.0v 3.0v battery regulation voltage cv charge detection 0a on off on off led-r led-g on off fast charge trickle charge pre- charge i batt 1ma 10%ichg ichg 10%ichg figure 3? typical charge profile
mp26075 ? high efficiency cradle charger mp26075 rev. 1.01 www.monolithicpower.com 11 5/23/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. fault indication charger off adapter ok? vin_uvlo=v bat_tc ? v bat =v bat_cc ? i chg =v bat_cv ? yes no v bat >=v bat_cv yes no timer out? no yes yes any protection ? no whole charge timer out? yes no yes ntc fault? yes charge suspend ntc ok? thermal protection yes yes charger recovery fold back charge current fault protection no charge termination float led-r and led-g yes no no figure 4? normal charge operation and fault protection flow chart
mp26075 ? high efficiency cradle charger 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. mp26075 rev. 1.01 www.monolithicpower.com 12 5/23/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. package information qfn10 (3 x 3 mm) 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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