MB3836PFV データシートの表示（PDF） - Fujitsu

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MB3836PFV

Li-Ion Battery Protection IC 3836

Fujitsu 

MB3836

2. Over-charge Detection Block, Discharge Detection Block, and Cell Voltage Input Block

• When battery is discharged after detection of an over-charge or re-discharged after detection of an over-charge

by recharging

If a cell voltage reaches or exceeds the over-charge detection voltage (4.325 V Typ), the COUT terminal (pin 2)

goes “H” level to turn off the Pch MOS FET for external charge control after a delay time (23 ms Typ) managed

by the capacitor (COVT) connected between the COVT terminal (pin 14) and GND. This stops charging the battery

and puts it into the over-charge detected state.

When a discharge is started in the over-charge detected state, the OCV terminal voltage is lowered by the body

diode voltage of the Pch MOS FET for external charge control. When the potential difference between the VCC

terminal and OCV terminal (pin 1) becomes 300 mV or more, the COUT terminal (pin 2) goes “L” level to turn

on the Pch MOS FET for external charge control and the cell voltage input block switch is turned off at the same

time.

An over-charge caused by recharging can be detected even with cell voltages remaining above the over-charge

release voltage (4.125 V Typ).

Discharge start↓

↓Charge start

↓Discharge start

Cell voltage

Cell voltage

input current

COVT terminal

VTH (4.325 V)

VH (0.2 V)

(4.125 V)

(45 µA)

(0 µA)

(6.26 V)

COUT terminal

OCV terminal

(VCC)

VTH (VCC − 0.3 V)

tD (23 ms)

Figure 4

tD (23 ms)

17

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