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BQ76952: BQ76952 creepage distance

Cheng Zhang
Prodigy 120 points
Part Number: BQ76952

HI Team,

I am checking out the BQ76952 and have some concern about the creepage distance.

The PCHG and PDSG pin shall be HV pin? When DSG/CHG MOSFET is off, the PACK/LD pin could be low voltage to VSS, however PCHG and PDSG could still be high voltage.

Is this pinout meeting the minimum creepage distance requirement?

Thanks.

  • 0
    TI__Mastermind 42060 points

    Hello Cheng,

    PCHG/PDSG are high-voltage pins up-to an abs max of 85-V. So that's okay.

    Best Regards,

    Luis Hernandez Salomon

  • 0 in reply to Luis H. S.
    Prodigy 120 points

    HI Luis,

    Creepage distance which relate to the working rms voltage. E.g. Both DSG and CHG pins up to 85V, however there are still NC pin between DSG and CHG, which I think is due to the creepage distance requirement, correct?

    I don't find the PCHG/PDSG off voltage, are they pulled low to VSS when PCHG and PDSG are not ON?

    Thanks

  • 0 in reply to Cheng Zhang
    TI__Mastermind 42060 points

    Hello Cheng,

    PCHG/PDSG are Hi-Z when OFF, so the pins get pulled to the BAT+ or PACK+ voltages when OFF due to the gate-source resistors.

    These drivers are high-side P-FET drivers, so it pulls the pin low with a small current source to Vss, to turn the PCHG/PDSG FETs ON.

    We have not seen any problems with their distance together.

    Best Regards,

    Luis Hernandez Salomon