MM1414

MITSUMI Protection of Lithium Ion Batteries MM1414 Protection of Lithium Ion Batteries Monolithic IC MM1414 Outline This IC is use to protect lithium-ion batteries consisting of three or four cells. It adopts a compact package and has the functions of previous models, with functions for overcharge detection, overdischarge detection and overcurrent detection. A dead time can be set externally. Features 1. Overcharge detection voltage accuracy ±25mV/cell 2. Consumption current (Vcell=4.4V) 50µA typ. 3. Consumption current (Vcell=3.5V) 23µA typ. 4. Consumption current (Vcell=1.8V) 2µA typ. 5. Overcharge sensing dead time: can be set externally 6. PF detection: warning signal when cell voltage falls Package TSOP-20A Applications IC for protection of lithium-ion batteries consisting of three or four cells Pin Assignment 1 2 3 20 19 18 17 16 15 14 13 12 11 4 5 1 2 3 4 5 6 7 8 9 10 TSOP-20A 6 7 8 9 10 OV N.C CS N.C DCHG N.C CDC COL COV GND 11 12 13 14 15 16 17 18 19 20 SEL N.C CON N.C V1 V2 V3 V4 N.C VCC MITSUMI Protection of Lithium Ion Batteries MM1414 Block Diagram MITSUMI Protection of Lithium Ion Batteries MM1414 Pin Description Pin No. Pin name I/O Overcharge detection output pin 1 OV Output NPNTr open collector output Normal: high impedance Overcharge: Low 2 N.C Not connected Overcurrent detection pin Monitors load current equivalently by the voltage drop between discharge control 3 CS Input FET source and drain, and makes DCHG pin high when the voltage goes belo...