MITSUMI MM3474K02VBE

MM3474 series is an overcharge, overdischarge and overcurrent protection IC for a lithium-ion / lithium-polymer secondary battery. This supports 3 to 5 serial cells, and the number of cells can be switched over by inputting high / low signal to SEL terminal. MM3474 series can protect Lithium ion battery pack of 6-plus serial cells by connecting in cascade. This also provides the control terminals of output overdischarge detection (SDC) and output overcharge detection (SOC), which allows configuring an application with fewer external parts for 6 or more cells connected in series.

ny kinds of optional ICs of MM3474 series, which are customizable for the usage by selecting optional function

Low cost and small size configuration can be achieved when MM3474 series is combined with MM3220V series which is 2 cells protection IC and used for the applications of 6 cells or 7 cells, etc.

Cell balance control function can be added when MM3513 series which is cell balance control IC is used.

• 3-, 4-, 5-cell protection switching function The 3-, 4-, or 5-cell protection can be switched by connecting the SEL1 pin and SEL2 pin to the VDD or VSS2 via a protection resistor. At the time of 4-cell protection, the operation of the overcharge detection circuit and overdischarge detection circuit for the V1 cell is stopped. Therefore, short-circuit the V1 pin and VSS1 pin before use. At the time of 3-cell protection, the operation of overcharge detection circuit and overdischarge detection circuit for V1 and V2 Cell is stopped. Therefore, shortcircuit the V2 pin, V1 pin and VSS1 pin before use.
• Communication function when cascade connected When using a cascade-connected IC with 6 or more cell protection, an overdischarge detection signal can be transmitted by inputting the DCHG output pin signal to the SDC pin via a resistor. If the current input to the SDC pin exceeds the SDC release current, it is recognized as normal state. If it drops below the SDC detection current or if it is open, it is recognized as overdischarge detection state. In the same way, an overdischarge detection signal can be transmitted by inputting the OV output pin signal to the SOC pin via a resistor.

In addition, charge / discharge is more controllable than inputting a signal into SDC terminal, SOC terminal from the outside independently.

• Lithium-ion rechargeable battery pack
• Lithium polymer rechargeable battery pack