MB3836 Datasheet, PDF (15/28 Pages) Fujitsu Component Limited. – Li-Ion Battery Protection IC

MB3836
(2) When the voltage is lowered by cell voltage input current and self-discharge after pulsed charge
Even when a cell voltage reaches or exceeds the over-charge detection voltage (4.325 V Typ), the cell voltage
does not enter the over-charge detected state if it falls below the over-charge detection voltage (4.325 V Typ)
within the delay time (23 ms Typ) managed by the capacitor (COVT) connected between the COVT terminal (pin
14) and GND.
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, stopping charging the battery, after a
delay time (23 ms Typ) managed by the capacitor (COVT) connected between the COVT terminal (pin 14) and
GND. At this time, the cell voltage input block switch is turned on to supply the cell voltage input current to that
cell so that high-voltage cells are lowered in voltage.
When all the cell voltages in the over-charge detected state become the over-charge release voltage (4.125 V
Typ) or less, the COVT terminal (pin 14) and COUT terminal (pin 2) go “L” level to turn on the Pch MOS FET for
external charge control.
When any cell voltage in the over-charge detected state becomes the over-charge release voltage (4.125 V Typ)
or less, the cell voltage input block switch is turned off.
Cell voltage
Cell voltage
input current
VTH (4.325 V)
VH (0.2 V)
(4.125 V)
(45 µA)
(0 µA)
COVT terminal
(6.26 V)
COUT terminal
Figure 2
tD (23 ms)
15