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| MITSUMI Detection of Lithium Ion Battery Overcharging MM1373 Detection of Lithium Ion Battery Overcharging Monolithic IC MM1373 Outline This IC detects overcharging of lithium ion batteries. It is designed for use with three or four battery cells, and detects battery voltages for each cell. An overcharge detection delay time can be set using an external capacitor. The overcharge detection signal output is open-collector, and goes low when overcharging is detected. Features 1. Consumption current VCEL=3.8V 3.0A typ. 2. Consumption current VCEL=2.3V 0.3A typ. 3. Input current between cell pins VCEL=3.8V 0.3A max. 4. Overcharge detection voltage A type 4.35V50mV 5. Overcharge detection delay time CT=0.22F 1.5S typ. 6. Detection voltage can be changed to accommodate customer needs Package SOP-8C SOP-8E Applications 1. For secondary protection of lithium ion battery packs Overcharge Detection ICs MM1373 Rank A Rank B Rank C Rank D Rank E Detection voltage 4.350V 4.250V 4.225V 4.130V 4.450V Hysteresis 250mV 250mV None None 100mV MITSUMI Detection of Lithium Ion Battery Overcharging MM1373 Block Diagram Pin Assignment 1 2 8 7 6 5 3 4 1 2 3 4 5 6 SOP-8C, SOP-8E 7 8 OUT CT GND V1 V2 V3 V4 VCC MITSUMI Detection of Lithium Ion Battery Overcharging MM1373 Pin Description Pin no. 1 Pin name OUT Function Reset output pin Internal equivalent circuit diagram 2 CT Delay capacitance pin 4 V1 Cell 1 power supply 5 V2 Cell 2 power supply 6 V3 Cell 3 power supply 7 V4 Cell 4 power supply 8 3 VCC GND MITSUMI Detection of Lithium Ion Battery Overcharging MM1373 Absolute Maximun Ratings Item VCC input voltage Symbol VCC V4 V3 V2 V1 VCT VOUT Pd TOPR -0.3~24 -0.3~24 300 -20~+80 V V mW C C -0.3~24 V Ratings Units * V3 input voltage 1 * V2 input voltage 1 * V1 input voltage 1 * CT pin voltage 2 * VOUT pin voltage Allowable loss Operating temperature V4 input voltage 1 * * Storage temperature TSTG -40~+125 > V4 = V3 = V2 = V1 = -0.3 > > > > 1 VCC = 2: A current no greater than 100A should be passed through pin Ct. Recommended Operating Conditions Item Input voltage between cells 1 VCC input voltage Symbol Vop1 Vop2 Ratings 2.0~4.35 4.0~18 Units V V Electrical Characteristics Item Consumption current 1 Consumption current 2 Pin I/O current between cells Overcharge detection voltage Hysteresis voltage Overcharge detection delay time Output voltage L Output leakage current (Except where noted otherwise, Ta=25C, VCEL=V4-V3=V3-V2=V2-V1=V1-GND, VCC=4 VCEL) Symbol I1 I2 I3 VS HSY TPLH VOL ILEAK VCEL=L Measurement conditions VCEL=3.8V VCEL=2.3V VCEL=3.8V (V4, V3, V2, V1 side) H, Ta=-20~+70C H L CT=0.22F IL=100A VCEL=3.8V, VOUT=24V 4.30 0.20 1.0 VCEL=L Min. Typ. Max. Units 3.0 0.3 0.0 4.35 0.25 1.5 6.0 0.5 0.3 4.40 0.30 2.0 0.4 0.1 A A A V V S V A MITSUMI Detection of Lithium Ion Battery Overcharging MM1373 Timing Chart 4.35V 4.10V V1~V4 1.5S CT 1.80V 0.60V OUT OUT (When CT is shorted) (When CT is open) Note : When pin Ct is shorted or left open, the output goes low when overcharging is detected. Application Circuits Note : By shorting each cell, two-, three- and four-cell series can be accommodated. A V4 cell should always be connected. If the V4 cell is shorted, the chip may not function correctly. Characteristics Detection voltage 6 5 Output delay time 3.0 2.5 Output voltage (V) Delay time (S) 4 3 2 1 2.0 1.5 1.0 0.5 0.0 -1100ppm -2200ppm 0 1 2 3 4.10 4.35 -25 25 75 Input voltage (No delay) (V) Temperature (C) |
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