MB3836 Datasheet, PDF (12/28 Pages) Fujitsu Component Limited. – Li-Ion Battery Protection IC

MB3836
s SETTING DELAY TIME for OVER-CHARGE DETECTION BLOCK
For over-charge detection, you can set the delay time from when charging the capacitor (COVT) connected to the
COVT terminal (pin 14) is started and the COVT terminal voltage increases until the COUT terminal (pin 2)
voltage goes “H” level (with the open-collector output off) with the COVT terminal at the threshold voltage.
Over-charge detection block delay time : tD (s) =: 2.3 × COVT (µF)
s SETTING PF OUTPUT DELAY TIME
For over-discharge detection, you can set the delay time from charging the capacitor (CUVT) connected to the
CUVT terminal (pin 12) is started and the CUVT terminal voltage increases until the PF terminal (pin 19) voltage
goes “L” level with the CUVT terminal at the threshold voltage.
PF output delay time : tD1 (s) =: 13.3 × CUVT (µF)
s SETTING POWER-DOWN DELAY TIME
You can set the delay time from charging the capacitor (CPDT) connected to the CPDT terminal (pin 11) is started
after “L” level output to the PF terminal (pin 19) at over-discharge detection and the CPDT terminal voltage
increases until the DOUT terminal (pin 3) voltage goes high with the CPDT terminal at the threshold voltage.
Power-down delay time : tD2 (s) =: 13.3 × CPDT (µF)
After the DOUT terminal goes “H” level to stop overdischarging, the OCV terminal (pin 1) goes “L” level to turn
off the entire internal circuitry of the IC so that the circuit current becomes 0 µA. Considering the time constant
based on the notebook PC’s capacitor connected to the OCV terminal, the discharge time constant of CPDT
terminal is used to prevent recovery (return) and shutdown (power-down) from being repeated in response to
variations in battery voltage. The capacitor connected to the OCV terminal on the notebook PC side requires
the restriction expressed below based on the value of the capacitor (CPDT) connected to the CPDT terminal.
OCV terminal external capacitor : COCV (µF) < 1790 × CPDT (µF)
s SETTING DELAY TIME for OVER-CURRENT DETECTION BLOCK
For over-current detection when 0.6 V (Typ) > VCC - OCV > 0.3 V (Typ), you can set the delay time from when
charging the capacitor (COCT) connected to the COCT terminal (pin 13) is started and the COCT terminal voltage
increases until the DOUT terminal (pin 3) voltage goes “H” level with the COUT terminal at the threshold voltage.
Over-current detection block delay time : tD1 (s) =: 12.5 × COCT (µF)
For over-current detection when VCC - OCV > 0.6 V (Typ), you can set the delay time from when charging the
capacitor (COCT) connected to the COCT terminal (pin 13) is started and the COCT terminal voltage increases
until the DOUT terminal (pin 3) voltage goes “H” level with the COCT terminal at the threshold voltage.
Over-current detection block delay time : tD2 (s) =: 0.9 × COCT (µF)
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