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Protection for Lithium-Ion Batteries

Protection IC for 3-5 Cell Batteries with Secondary Protection Function Protection IC for Lithium Ion/Lithium Polymer 3-5 Cell Secondary Battery MM3684 series



The <MM3684 series> features built-in secondary protection function compliant with international standards for electronic tools, which contributes to improved safety during use.
The <MM3684 series> features the additional functions of temperature protection and multi-stage overcurrent protection. These help to achieve a low consumption current and better space efficiency that could not be achieved with existing circuit layouts, and also helps to improve safety of lithium ion batteries.


  1. Built-in overcharge, over-discharge and overcurrent protection functions.
  2. 3-stage discharge overcurrent protection
  3. Detection of 2 values of high and low temperatures with an external NTC to protect battery packs
  4. Built-in secondary protection function to drive external FET for FUSE
  5. Intermittent operation with temperature protection for a low consumption current
  6. Over-discharge detection voltage switch function (2 values can be set)

Main specifications

Overcharge detection voltage 1 : 3.6 to 4.5V (5mV steps) accuracy ±25mV
2 : 3.6 to 4.5V (5mV steps) accuracy ±25mV
Over-discharge detection voltage 1 : 2.0 to 3.0V (50mV steps) accuracy ±80mV
2 : 2.0 to 3.0V (50mV steps) accuracy ±80mV
Discharge overcurrent
detection voltage
1 : 30 to 300mV (5mV steps) accuracy ±15%
2 : 2x/4x discharge overcurrent 1 accuracy ±20%
Short circuit detection voltage 4x/8x discharge overcurrent 1 accuracy ±100mV
Charge overcurrent detection voltage -300 to -20mV (5mV steps) accuracy ±10mV
Temperature protection
detection temperature
-30℃ to 80℃ (5℃ steps, 2 values can be set)
REG terminal output voltage 1.5 to 3.0V (50mV steps) accuracy ±25mV
Package VSOP-24A
Dimensions 7.9×7.6×1.25 (W×D×H)   (Unit : mm)

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