MB3836 データシートの表示（PDF） - Fujitsu

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MB3836

Li-Ion Battery Protection IC 3836

Fujitsu 

MB3836

4. Over-current Detection Block 1

When a discharge current is relatively small 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) by RON of the Pch MOS

FET for external charge control becomes 300 mV or more again, an over-current is detected after a delay time

(7 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 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

Figure 6

tD (7 ms)

Internal bias : Off

20

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