MM4128B/MM4129B Series

Lithium-Ion Battery protection IC using high voltage CMOS process for overcharge, overdischarge and overcurrent protection of the rechargeable Lithium-ion or Lithium-polymer battery. The overcharge, overdischarge, discharging overcurrent, charging overcurrent, and short protection of the rechargeable Lithium-ion or Lithium-polymer battery can be detected. Each of these IC composed of four voltage detectors, short detection circuit, reference voltage sources, oscillator, counter circuit and logical circuits.

Outline

The MM4128B / MM4129B series is a double protection IC for 2 cell Li batteries. It detects battery voltage for each cell. The configuration of delay time can be achieved. Output at the time of detection can be held for a fixed period of time; therefore, this can maintain a regular disconnection time of a fuse. In addition, high cell voltage can be dropped and then stopped at the level where battery deterioration does not occur by Electrical discharge function of the IC after disconnecting the fuse.

For 2-cells secondary protection
（1） Range and accuracy of detection and release voltage
　• Overcharge detection voltage 3.6V～5.0V, 5mV Step Accuracy±15mV
　• Overcharge release voltage 3.1V～5.0V, 50mV Step Accuracy±50mV
• Standby detection voltage Selection from 2.5V or 3.5V　Accuracy±300mV

（2） Range of detection delay time
　• Overcharge detection delay time Selection from 1s or 2s or 4s or 8s
　• Overcharge release delay time Selection from Selection from 1ms or 2ms or 4ms or 8ms or 16ms
　• Overcharge detection timer reset delay time 16ms fixed

（3） Range of internal regulator voltage
　• COUT terminal output voltage H 1.8V or 3.3V or 4.7V

（4） Current consumption
　• Current consumption(Vcell=4.0V) Typ. 0.85uA Max. 1.70uA
　• Current consumption at standby(Vcell=2.0V) Typ. 0.15uA Max. 0.30uA