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Protection for Lithium-Ion Batteries

Low Current Detection Function Protection IC for Lithium Ion/Lithium Polymer 1 Cell Secondary Battery MM3724



Power consumption of recent smartphones, tablets and other devices is increasing in recent years due to the higher functionality of these devices. FETs that are used to control charging and discharging are increasingly moving toward models with low-ON resistance to minimize electrical loss of the battery itself, leading to a greater number of battery products with a lower impedance.
Circuits with a lower impedance need to keep the overcurrent detection voltage low.
The <MM3724> is a protection IC that allows the overcurrent detection voltage to be set down to a minimum of 20mV.
If a low-ON resistance FET had been used, the appropriate adjustment for the overcurrent detection level becomes difficult, leading to generation of more heat than expected. Using the <MM3724> allows the appropriate overcurrent detection to be set, making measures to protect against battery heat easier.

(The photo is of the SSON-6J)


  1. High-precision overcurrent detection ±15% or less
  2. High-precision overcharge detection ±20mV (-5℃ to 55℃)
  3. Customizable detection threshold and delay time

Main specifications

Overcharge detection
3.6 to 5.0V (5mV steps) accuracy ±20mV
Overcurrent detection
2.0 to 3.0V (50mV steps) accuracy ±35mV
Discharge overcurrent detection
+20 to +300mV (1mV steps) accuracy ±15% or less
Charge overcurrent detection
-300 to -20mV (1mV steps) accuracy ±15% or less
Short circuit detection
0.4 to 0.9V (50mV steps) accuracy ±100mV
Consumption current (normal)
3.0µA typ.  6.0µA max.
Consumption current (standby)
0.1µA max.
(when excess discharge latch function is used)
0.6µA max.
(when excess discharge latch function is not used)
0V charge inhibition battery voltage
0.9V fixed or 1.3 to 1.8V (0.1V steps)
2.0(W) × 1.6(D) × 0.55(H) mm (SON-6C)
1.4(W) × 1.4(D) × 0.55(H) mm (SSON-6J)

(Note1) The VOUT launch conditions can be set when the voltage returns

Support / Contact

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