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Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements withou t prior notification. The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. MITSUMI 1cell Li-ion/Li-polymer battery protection IC MM3721 series 1cell Li-ion/Li-polymer battery protection IC MM3721 series Outline MM3721 series are Li-ion battery protection IC and detect charge current/discharge current with high precision by current sensing resistor (Rsns). MM3721 have two step discharge overcurrent detection. And system is protected appropriately in the next 2 state, Normal discharge mode and large current discharge mode. (2) Delay time setting Overcharge detection delay time 256ms to 4.6s Overdischarge detection delay time 8ms to 256ms Discharging overcurrent 1 detection delay time 8ms to 7168ms Discharging overcurrent 2 detection delay time 6ms to 64ms (tVdet3-2 < tVdet3-1) Charging overcurrent detection delay time 6ms to 64ms Short detection delay time 250µs to 400µs (3) Current consumption Normal mode Typ. 3.0µA, Max. 6.0µA Stand-by mode Max. 0.1µA (In case Overdischarge latch function Enable.) Max. 0.6µA (In case Overdischarge latch function Disable.) (4) 0V battery Charge function Selectable "Permission" or "inhibition" (5) Absolute maximum ratings VDD pin VSS−0.3V to 12V COUT pin and V− pin VDD−28V to VDD+0.3V DOUT pin and CS pin VSS−0.3V to VDD+0.3V Storage temperature −55°C to +125°C Operation temperature −40°C to + 85°C Features (Unless otherwise specifi ed, Topr=+25°C) (1) Range and accuracy of detection voltage Overcharge detection voltage 3.6V to 5.0V, 5mV step Accuracy±25mV (Ta=−20°C to +60°C) Overcharge release voltage Vdet1−0.2V to Vdet1, 5mV step Accuracy±30mV Overdischarge detection voltage 2.0V to 3.0V, 50mV step Accuracy±35mV Overdischarge release voltage 2.0V to 3.0V, 50mV step Accuracy +65/-35mV (In case Vdet2=Vrel2) Accuracy +90/-65mV (In case Vdet2 Vrel2) Discharging overcurrent detection voltage 1 20mV to 150mV, 1mV step Accuracy± (Note1) Discharging overcurrent detection voltage 2 Vdet3-1+10mV to 200mV, 1mV step Accuracy± (Note1) Charging overcurrent detection voltage −150mV to −20mV, 1mV step Accuracy± (Note1) Short detection voltage 0.4V to 0.9V, 0.05V step Accuracy±100mV 0V battery charge inhibition battery voltage 1.3V to 1.8V / 0.1V step 0.9V Accuracy±100mV 0.9V Accuracy±300mV Note1 : Current detection voltage Accuracy. V (mV) 20 40 60 80 100 120 140 Vdet3-1, Vdet3-2, Vdet4 (mV) Vdet3-1, Vdet3-2, Vdet4 Accuracy
Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements withou t prior notification. The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. MITSUMI 1cell Li-ion/Li-polymer battery protection IC MM3721 series Pin Assignment Top view Pin No. FunctionSSON-6J SON-6C 564 13 2 VDDCS VSS DOUTV- COUT VDDCS VSS DOUTV- COUT
1 Charger negative voltage input
2 Charge FET control terminal
3 Discharge FET control terminal
4 Negative power supply voltage input
5 Positive power supply voltage input
6 Current detection terminal
Protection mode latch function Hys-Cancel Discharging overcurrent release range extended function. Overcharge detection voltage [V] Overcharge detection voltage [V] Overdischarge detection voltage [V] Overdischarge detection voltage [V] Discharging overcurrent detection voltage [V] Discharging overcurrent detection voltage [V] Charging overcurrent detection voltage [V] Short detection voltage [V] Delay time (Note2) Overcharge Overdischarge Discharge overcurrent Overcharge Overdischarge Vdet1 Vrel1 Vdet2 Vrel2 Vdet3 Vdet1 Vrel1 Vdet2 Vrel2 Vdet3-1 Vdet3-2 Vdet4 Vshort Please inquire to us, if you need another spec. Note2 : Delay time tVdet1 [s] tVrel1 [ms] tVdet2 [ms] tVrel2 [ms] tVdet3-1 [ms] tVrel3-1 [ms] tVdet3-2 [ms] tVrel3-2 [ms] tVdet4 [ms] tVrel4 [ms] tshort [us]
Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements withou t prior notification. The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications. MITSUMI 1cell Li-ion/Li-polymer battery protection IC MM3721 series Application Circuit Symbol Part Min. Typ. Max. Purpose R1 Resistor 100 1k For voltage fl uctuation, For ESD C1 Capacitor 0.01µF 0.1µF 1.0µF For voltage fl uctuation R2 Resistor 1.0k 10k Current limit for charger reverse connection C2 Capacitor 0.1µF For exogenous noise C3 Capacitor 0.1µF For exogenous noise Rsns Resistor 20m Current detection resistance C4 Capacitor 0.1µF For exogenous noise DFET CFET Nch MOS FET Charge and discharge control Cell COUTDOUT DFETRsns CFET CS VSS VDD Oscillator Counter Logic 0V cell Charge Delay Dischargeovercurrent1 Protectionmoderelease Short Rshort Rpu Over charge Over discharge Dischargeovercurrent2 Chargeovercurrent2 This typical application circuit and constant value do not guarantee proper operation. Please evaluate thoroughly by actual application to set up constants.