Protection of Lithium-Ion Batteries (for Double-Protect) MM1451 Protection of Lithium-Ion Batteries (for Double-Protect) Monolithic IC MM1451
This IC is used for double-protection of lithium-ion batteries with from one to three cells, and has an ultra-
compact package. Short-circuits between cells accommodate series connections of one to three cells. Features
1. Overcharge detection voltage accuracy (0°C to 50°C)
4. Pin I/O current between cells (Vcell=3.8V)
5. Delay time on overcharge voltage detection (Ct=0.22µF)
Applications
IC for double-protection of lithium-ion batteries with one to three cells. Pin Assignment Protection of Lithium-Ion Batteries (for Double-Protect) MM1451 Block Diagram Protection of Lithium-Ion Batteries (for Double-Protect) MM1451 Pin Description Functions Equivalent circuit diagram Protection of Lithium-Ion Batteries (for Double-Protect) MM1451 Absolute Maximun Ratings (Ta=25°C) Operating temparature Storage temparature VCC Input voltage V1 Input voltage *1 V2 Input voltage *1 V3 Input voltage *1 Ct pin voltage *2 VOUT pin voltage Allowable loss
Note 1 : *1 18V >= V3 >= V2 >= V1 >= -0.3
Note 2 : *2 Do not impress current of 300µA or more on the Ct pin. Electrical Characteristics 1 (Except where noted otherwise, Ta=25°C, VCEL=V3-V2=V2-V1=V1-GND, VCC=3 VCEL) Measurement conditions Min. Typ. Max. Unit Current consumption 1 Current consumption 2 Pin I/O current between cells Overcharge detection voltage Hysterisis voltage Overcharge detection delay time Output current Electrical Characteristics 2 (Except where noted otherwise, Ta=25°C, VCEL=V3-V2=V2-V1=V1-GND, VCC=3 VCEL) Measurement conditions Min. Typ. Max. Unit Current consumption 1 Current consumption 2 Pin I/O current between cells Overcharge detection voltage Hysterisis voltage Overcharge detection delay time Output current Output leakage current Protection of Lithium-Ion Batteries (for Double-Protect) MM1451 Electrical Characteristics 3 (Except where noted otherwise, Ta=25°C, VCEL=V3-V2=V2-V1=V1-GND, VCC=3 VCEL ) Measurement conditions Min. Typ. Max. Unit Current consumption 1 Current consumption 2 Current consumption 3 Current consumption 4 Pin I/O current between cells Overcharge detection voltage Hysterisis voltage Overcharge detection delay time Output current Output leakage current Measuring Circuit Protection of Lithium-Ion Batteries (for Double-Protect) MM1451 Application Circuit
Note 1: Can support 1, 2 or 3 cells by shorting each cell. However, be sure to connect a battery for V3 cell.
V3 cell may not operate correctly when shorted.
Note 2: When connecting batteries, be sure to connect in the following order: GND V3, and VCC
Note 3: Output may go ON momentarily when starting up power supply. If this error output during startup
becomes a problem, connect the VCC pin last.
Note 4: Operation can not be guaranteed for connections other than the above. Timing Chart OUT (at Ct short) (at Ct open)
Note: Output goes low simultaneously with overcharge detection at Ct pin short and open. Protection of Lithium-Ion Batteries (for Double-Protect) MM1451 Characteristics Detection voltage Output delay time Delay time (S) Output voltage (V) Input voltage (No delay) (V) Temperature (°C) Consumption current Pin I/O current between cells Consumption current ( Pin I/O current between cells ( -0.3 Cell voltage (V) Cell voltage (V)
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