mitsumi control of lithium ion batteries charging mm1332 control of lithium ion batteries charging monolithic ic mm1332 outline this ic is a high precision constant voltage constant current power source controller for lithium ion batteries serving as power drivers for p-mos fet. it was developed for use with one to three cell chargers, and the constant current value can be set freely with external resistance. it has a built-in amplifier for detecting low battery voltage. using this ic enables the easy addition of a lithium ion battery charging function to conventional battery-charging devices. features 1. output voltage (ta= - 20c+~70c) 3cell : 12.3v/12.6v150mv 2cell : 8.2v/8.4v100mv 1cell : 4.1v/4.2v50mv 2. current consumption 250a typ. 3. constant current output set by external resistance current limit (reference voltage) 0.1v=external resistance current value 4. low voltage detection function (lv) 2.0v/cell package sop-8c, sop-8e (mm1332 f) * the box represents the output (charging) voltage rank. applications 1. for charging lithium ion batteries 2. high-precision stable power sources for all types of equipment absolute maximum ratings (ta=25c) item symbol rating units storage temperature t stg - 40~+125 c operating temperature t opr - 20~+70 c power supply voltage v cc max. - 0.3~+18 v output voltage v o max. - 0.3~v cc v sw input voltage v sw - 0.3~v cc +0.3 v allowable power dissipation pd 300 mw
mitsumi control of lithium ion batteries charging mm1332 electrical characteristics (unless otherwise specified ta=25c, v cc =5v/cel) item symbol measurement conditions min typ. max. units operating power supply v cc 5.0 17.0 v voltage range current consumption 1 i cc 1 vsw1=vsw2=ov (charge : on) 250 a current consumption 2 i cc 2 vsw1=vsw2=v cc (charge : off) 2 a output voltage v o ta= - 20~+70c, mm1332a, b, c 4.05 4.10 4.15 v/sell ta= - 20~+70c, mm1332d, e, f 4.15 4.20 4.25 current limits v cl 90 100 110 mv cel-cs resistance r cel mm1332a, b, c 820 k /sell mm1332d, e, f 840 sw1 input current i sw 120a v l 1 charge : on - 0.3 2.0 v sw1 input voltage v h 1 charge : off vcc vcc v - 1.0 +0.3 low-voltage detection voltage l v a~f rank 1.90 2.00 2.10 g rank 2.00 2.15 2.30 v/sell sw2 input current i sw 220a v l 2 low-voltage detection circuit : on - 0.3 2.0 v sw2 input voltage v h 2 low-voltage detection circuit : off vcc vcc v - 1.0 +0.3 low voltage detection i lv 0.2 a output leak current low voltage detection v lv i sink =1ma 0.2 0.4 v output saturation voltage * : mm1332 a : output voltage 4.1v - for 1cell b : output voltage 8.2v - for 2cell c : output voltage 12.3v - for 3cell d : output voltage 4.2v - for 1cell e : output voltage 4.4v - for 2cell f : output voltage 12.6v - for 3cell g : output voltage available
mitsumi control of lithium ion batteries charging mm1332 pin assignment description 14 3 2 85 6 7 sop-8c/sop-8e pin no. name i/o description 1 sw1 input 2 sw2 input 3 lv output 4 gnd 5 cs input 6 cel input 7 ext output 8 v cc charging on/off control input pin. sw1=v cc : off, sw1=gnd : on goes off when open as it is pulled up to v cc . low voltage detection circuit on/off control input pin. sw2=v cc : off, sw2=gnd : on goes off when open as it is pulled up to v cc . low voltage detection circuit output pin. npn-tr open collector output; goes on (low level) for low voltage. ground pin. current detection pin. detects current when external resistor voltage drops and controls current. reference voltage 0.1v=external resistance current value battery voltage input pin * six types depending on rank : 4.1v, 8.2v, 12.3v, 4.2v, 8.4v, 12.6v, (typ.) constant voltage circuit output pin. controls external p-mos fet gate and charges constant voltage. power supply input pin. * g : constant voltage circuit input pin external resistance ratio (r1 : r2) enables setting constant voltage circuit output voltage. low voltage detection voltage is set for one cell (4.1v or 4.2v).
mitsumi control of lithium ion batteries charging mm1332 block diagram mm1332a, b, c, d, e, f, mm1332g
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