Control of Lithium Ion Batteries Charging MM1332 MITSUMI 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 (Ta=25°C) Item Symbol Rating Units Storage temperature TSTG -40~+125 °C Operating temperature TOPR -20~+70 °C Power supply voltage VCC max. -0.3~+18 V Output voltage VO max. -0.3~VCC V SW input voltage VSW -0.3~VCC+0.3 V Allowable power dissipation Pd 300 mW Control of Lithium Ion Batteries Charging MM1332 MITSUMI Electrical Characteristics Item (Unless otherwise specified Ta=25°C, VCC=5V/CEL) Symbol Operating power supply voltage range Measurement Conditions VCC Min Typ. Max. Units 5.0 17.0 V Current consumption 1 ICC1 VSW1=VSW2=OV (Charge : ON) 250 µA Current consumption 2 ICC2 VSW1=VSW2=VCC (Charge : OFF) 2 µA Output voltage VO Current limits VCL CEL-CS resistance RCEL SW1 input current ISW1 SW1 input voltage Ta=-20~+70°C, MM1332A, B, C 4.05 4.10 4.15 Ta=-20~+70°C, MM1332D, E, F 4.15 4.20 4.25 90 100 110 MM1332A, B, C 820 MM1332D, E, F 840 Charge : ON VH1 Charge : OFF Low-voltage detection voltage LV SW2 input current ISW2 output leak current Low voltage detection output saturation voltage * : MM1332 -0.3 2.0 VCC VCC -1.0 +0.3 1.90 2.00 2.10 G Rank 2.00 2.15 2.30 20 Low-voltage detection circuit : ON VH2 Low-voltage detection circuit : OFF SW2 input voltage Low voltage detection µA A~F Rank VL2 VLV 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 ISINK=1mA 2.0 VCC VCC -1.0 +0.3 0.2 V V V/sell µA -0.3 ILV mV kΩ/sell 20 VL1 V/sell V V 0.2 µA 0.4 V Control of Lithium Ion Batteries Charging MM1332 MITSUMI Pin Assignment Description 8 7 6 5 1 2 3 4 SOP-8C/SOP-8E Pin No. Name I/O Description Charging ON/OFF control input pin. 1 SW1 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 Output 4 GND 5 CS Input 6 CEL Input 7 EXT Output 8 VCC 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 current value * 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. Constant voltage circuit input pin *G : 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 Block Diagram MM1332A, B, C, D, E, F, MM1332G Control of Lithium Ion Batteries Charging MM1332