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Protection for Lithium-Ion Batteries

MM3721 Series


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.

Product Series

For one-cell


1) Range and accuracy of detection voltage
●Overcharge detection voltage 3.6V to 5.0V, 5mV step Accuracy±20mV
●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±ΔV ※1
●Discharging overcurrent detection voltage 2 Vdet3-1 + 10mV to 200mV, 1mV step Accuracy±ΔV ※1
●Charging overcurrent detection voltage -150mV to -20mV, 1mV step Accuracy±ΔV ※1
●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 Accuracy±100mV
0.9V Accuracy±300mV

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) 0V battery Charge function Selectable"Permission" or "inhibition"

4) 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.)

*1 Accuracy of overcurrent detection voltage


Package 0V battery
Overcharge release function Overdischarge release function Discharging overcurrent release function Overcharge detection voltage
Overcharge release voltage
Overdischarge detection voltage
Overdischarge release
Discharging overcurrent detection voltage1
Discharging overcurrent detection voltage2
Charging overcurrent detection voltage
Short detection voltage
Overcharge detection delay time
Overcharge release delay time
Overdischarge detection
delay time
Overdischarge release
delay time
Discharging overcurrent detection
delay time 1
Discharging overcurrent detection
delay time 2
Discharging overcurrent release
delay time
delay time
Charging overcurrent release delay time
Short detection
delay time


Associated Data

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