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BQ76952: BQ76952 How to prevent the high-side NMOS VGS voltage from being too high when the BQ76952 DSG pin is turned on

Star Xu
Genius 9645 points
Part Number: BQ76952

Hi

I have a query need your help.

How to prevent the high-side NMOS VGS voltage from being too high when the BQ76952 DSG pin is turned on.

Waiting for your reply.

Thanks

Star

  • 0
    TI__Mastermind 23081 points

    Hello Star,

    The BQ76952 uses the charge pump to drive the CHG and DSG FETs. The charge pump will use an overdrive voltage which can be set to 11V or 5.5V. By default this is set to 11V.

    Basically the Vgs voltage is either 5.5V or 11V. This is also explained in Section 5.2.2 High-Side NFET Drivers of the Technical Reference Manual



    Note: Whenever the charge pump is in operation (in 5.5 V or 11 V mode), the maximum voltage on VBAT should be reduced to ensure the voltage on CP1, CHG, and DSG does not exceed their maximum specified voltage.

    Regards,
    Jose Couso