MM1332

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=-20°C+~70°C) 3Cell : 12.3V/12.6V±150mV 2Cell : 8.2V/8.4V±100mV 1Cell : 4.1V/4.2V±50mV 250µA typ. set by external resistance 0.1V=external resistance current value 2.0V/cell 2. Current consumption 3. Constant current output Current limit (reference voltage) 4. Low voltage detection function (LV) 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 Item Storage temperature Operating temperature Power supply voltage Output voltage SW input voltage (Ta=25°C) Symbol TSTG TOPR VCC max. VO max. VSW Pd Rating -40~+125 -20~+70 -0.3~+18 -0.3~VCC -0.3~VCC+0.3 300 Units °C °C V V V mW Allowable power dissipation MITSUMI Control of Lithium Ion Batteries Charging MM1332 Electrical Characteristics Item Operating power supply voltage range Current consumption 1 Current consumption 2 Output voltage Current limits CEL-CS resistance SW1 input current (Unless otherwise specified Ta=25°C, VCC=5V/CEL) Measurement Conditions Min 5.0 VSW1=VSW2=OV (Charge : ON) VSW1=VSW2=VCC (Charge : OFF) Ta=-20~+70°C, MM1332A, B, C Ta=-20~+70°C, MM1332D, E, F MM1332A, B, C MM1332D, E, F Charge : ON Charge : OFF A~F Rank G Rank Low-voltage detection circuit : ON Low-voltage detection circuit : OFF -0.3 VCC -1.0 1.90 2.00 -0.3 VCC -1.0 2.00 2.15 20 2.0 VCC +0.3 0.2 ISINK=1mA 0.2 0.4 V µA V 4.05 4.15 90 250 2 4.10 4.20 100 820 840 20 2.0 VCC +0.3 2.10 2.30 V V/sell µA V 4.15 4.25 110 V/sell mV kΩ/sell µA V Typ. Max. Units 17.0 V µA µA Symbol VCC ICC1 ICC2 VO VCL RCEL ISW1 VL1 SW1 input voltage VH1 LV ISW2 VL2 Low-voltage detection voltage SW2 input current SW2 input voltage VH2 Low voltage detection output leak current Low voltage detection output saturation voltage ILV VLV * : 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 8 7 6 5 1 2 3 4 SOP-8C/SOP-8E Pin No. Name SW1 I/O Input SW1=VCC : OFF, SW1=GND : ON Goes OFF when open as it is pulled up to VCC. Low voltage detection circuit ON/OFF control input pin. 2 SW2 Input SW2=VCC : OFF, SW2=GND : ON Goes OFF when open as it is pulled up to VCC. 3 LV GND CS Input Output 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 Battery voltage input pin 6 CEL Input current value Description Charging ON/OFF control input pin. 1 4 5 * 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. 7 8 EXT VCC Output Constant voltage circuit pin *G : External resistance ratio input R2) enables setting constant voltage circuit output voltage. (R1 : 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