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BQ76952: FET control without external MCU but including Body Diode Protection

Jejomar Ildefonso
Genius 9550 points
Part Number: BQ76952


Hi Team,

Need your assistance on this. I'm trying to control the Discharge FET by using the DFETOFF pin. However, this feature disable completely any protection feature of the FET, such as the body diode protection in charge. As a result, when the battery is charging, there is a lot of power loss, since my DSG FET is not enabled for body diode protection.

Is there a method to implement FET control without an external MCU, but including such body diode protection?
I tried a workaround, setting the DFETOFF pin as cell thermistor and enabling the Over Temperature Discharge protection. It seems to work well, however the protection release is too slow, and the battery turns on with 5s of delay approximately (also with Protections:Recovery:Time = 0s).


Kind Regards,

Jejomar

  • +1
    TI__Genius 11755 points

    Hey Jejomar,

    The DFETOFF pin is supposed to be used for quick turn off of the FET when there is a fault event detected by the host controller. The discharge FET will never be able to turn on so long as DFETOFF is asserted. Same goes for the charge FET and the CFETOFF pin.

    As far as I know there is no workaround for this. We will consider this for future versions of this product.

    Thanks,
    Caleb