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| MITSUMI For lithium ion battery protection (for double protection) MM1373 For lithium ion battery protection (for double protection) 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 NPN open-collector, and goes low when overcharging is detected. MM1451 is available for 1 ~ 3 cells. Overcharge detection signal output is PNP output, and output goes high during detection. Features 1. Consumption current VCEL=3.8V 3.0A typ. 0.3A typ. 2. Consumption current VCEL=2.3V 0.3A max. 3. Input current between cell pins VCEL=3.8V 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 3 ~ 4 cell lithium ion batteries, for double protection. Overcharge Detection ICs MM1373 Rank A Rank C Rank D Rank E Detection voltage 4.350V 4.225V 4.130V 4.450V Hysteresis 250mV None None 100mV MITSUMI For lithium ion battery protection (for double protection) 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 For lithium ion battery protection (for double protection) MM1373 Pin Description Pin no. 1 Pin name OUT Function Reset output pin Internal equivalent circuit diagram 2 CT Delay capacitance pin 3 4 GND V1 Ground pin Cell 1 power supply 5 V2 Cell 2 power supply 6 V3 Cell 3 power supply 7 V4 Cell 4 power supply 8 VCC MITSUMI For lithium ion battery protection (for double protection) 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 * * -40~+125 Storage temperature TSTG > 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=V2V1=V1-GND, VCC=4 VCEL) Models listed MM1373AF 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 For lithium ion battery protection (for double protection) MM1373 Timing Chart 4.35V 4.10V V1~V4 1.5S CT 1.80V 0.60V OUT OUT (When CT is open) Note : When pin Ct is shorted or left open, the output goes low when overcharging is detected. Application Circuits Note 1: 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. Note 2: The input resistance for each cell should be 1k or lower. Also, please select the appropriate value for the external capacitor according to the usage environment. Note 3: Connect in the following order when connecting the battery: GND V4 and VCC V2 V1 or V3. 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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