MM3474F03VBE

3 to 5cells lithium-ion / lithium-polimar secondary battery protection IC 3 to 5cells lithium-ion / lithium-polimar secondary battery protection IC 　MM3474 Series Description 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. We provide many kinds of optional ICs of MM3474 series, which are customizable for the usage by selecting optional functions. 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. Features (Unless otherwise specified, Ta=25 degC) ・Detection voltage Range Accuracy Overcharge detection voltage 3.6V to 4.5V, 5mV steps +/-25mV(Ta=0 to +50 degC) Overdischarge detection voltage 2.0V to 3.0V, 50mV steps +/-80mV Overcurrent detection voltage 50mV to 300mV, 5mV steps +/-15mV Short detection voltage 0.2V to 1.0mV, 50mV steps +/-100mV ・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. SEL1 pin SEL2 pin MM3474 Setting High (VDD) High (VDD) 5 cell prptection High (VDD) Low (VSS2) 4 cell prptection Low (VSS2) High (VDD) 3 cell prptection Low (VSS2) Low (VSS2) prohibite ・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. Applications ・Lithium-ion rechargeable battery pack ・Lithium polymer rechargeable battery pack Package type ・TSOP-20C/20D 6.50 × 6.40 × 1.10 [mm] 1 3 to 5cells lithium-ion / lithium-polimar secondary battery protection IC Block diagram Overdischarge release　：　「Voltage release」 type 2 3 to 5cells lithium-ion / lithium-polimar secondary battery protection IC Block diagram Overdischarge release　：　「Load release + Voltage release」 type 3 3 to 5cells lithium-ion / lithium-polimar secondary battery protection IC Package and pin configuration Pin No. Pin No. Function 1 OV Charge control output terminal. Output type is Pch open drain. Active "Hi impedance". 2 V- Input terminal connected to charger negative voltage. Detected charger connection and load detection. 3 CS Input of overcurrent detection. The voltage of the sense resistance is observed, and the overcurrent is detected. 4 DCHG 5 COV This pin is dead time setting of overcharge detection and release. 6 CDC This pin is dead time setting of overdischarge detection and release. 7 COL1 This pin is dead time setting of overcurrent detection. 8 COL2 This pin is dead time setting of overcurrent release. 9 VSS1 The input terminal of the negative voltage of V1 cell . 10 VSS2 The input terminal of the ground of IC. 11 SEL1 12 SEL2 This pin is for changing function for 3cell in series or 4cell in series , 5cell in series. SEL1 = H , SEL2 = H　　→　　5Cell protection SEL1 = H , SEL2 = L　　→　　4Cell protection SEL1 = L , SEL2 = H　　→　　3Cell protection　　(SEL1=SEL2=L setting is prohibited. ) 13 V1 The input terminal of the positive voltage of V1 cell, and the negative voltage of V2 cell . 14 V2 The input terminal of the positive voltage of V2 cell, and the negative voltage of V3 cell . 15 V3 The input terminal of the positive voltage of V3 cell, and the negative voltage of V4 cell . 16 V4 The input terminal of the positive voltage of V4 cell, and the negative voltage of V5 cell . 17 V5 The input terminal of the positive voltage of V5 cell . 18 VDD 19 SDC 20 SOC Discharge control output terminal. Output type is CMOS. Active "Low". The input terminal of the power supply of IC. I I SDC