MB3836 Datasheet, PDF (21/28 Pages) Fujitsu Component Limited. – Li-Ion Battery Protection IC

MB3836
5. Over-current Detection Block 2
When a discharge current is relatively large as an over-current, if the potential difference between the VCC
terminal and OCV terminal (pin 1) by RON of the Pch MOS FET for external charge control becomes 300 mV
or more, the capacitor (COCT) connected between the COCT terminal (pin 13) and GND is charged. No over-
current is detected if the OCV terminal voltage returns to the battery voltage level within the delay time (7 ms
Typ). If the potential difference between the VCC terminal and OCV terminal (pin 1) of the Pch MOS FET for
external charge control becomes 600 mV or more, an over-current is detected after a delay time (500 ms Typ)
managed by the capacitor (COCT) connected between the COCT terminal (pin 13) and GND. At this time, the
DOUT terminal (pin 3) goes “H” level to turn off the Pch MOS FET for external discharge control, both of the VS
terminal (pin 5) and OCV terminal (pin 1) go “L” level, and the bias source in the IC is completely turned off as well.
Recharging can be restarted by setting the OCV terminal (pin 1) to “H” level to set the DOUT terminal (pin 3) to
“L” level and VS terminal (pin 5) to “H” level, respectively.
OCV terminal
COCT terminal
(VCC)
VTH (VCC - 0.3 V)
VTH (VCC - 0.6 V)
0V
(5.8 V)
DOUT terminal
VS terminal
0V
↓Charge start
tD (500 µs)
Figure 7
Internal bias : Off
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