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Protection for Lithium-Ion Batteries

MM3734 Series


The MM3734 series are voltage monitor ICs for rechargeable lithium-ion or lithium-polymer batteries secondary protection, using a high voltage CMOS process. 1-cell lithium-ion or lithium-polymer battery can be detected overcharge state. Internal circuit is composed of voltage detectors, reference voltage sources, an oscillator, a counter circuit and logical circuits.

Product Series

For 1 cell secondary protection


1) High-accuracy detection voltage
●Detection voltage 4.0V to 4.5V, 5mV steps Accuracy±20mV,
●Hysteresis voltage 0V to 1.0V, 50mV steps
However, "Detection voltage-Hysteresis voltage<4.0V" is disabled.

2) Range of Detection delay time
●Detection delay time Selectable from 0.25s, 1.02s, 2.048s, 4.096s

3) Low current consumption
●Normal mode Typ. 1.5µA, Max. 3.0µA
●Stand-by mode Max. 0.8µA


Package Overcharge detection voltage
Overcharge release voltage
Overcharge detection delay time
Overcharge release delay time



Associated Data

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