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BQ76952EVM: Diode D1 usage

Koji Ikeda
Expert 5725 points
Part Number: BQ76952EVM
Other Parts Discussed in Thread: BQ76952

Hello support team,

Customer asks diode D1 usage on bq76952 EVM. What is purpose of D1?

Thanks,

Koji Ikeda

  • 0
    TI__Guru* 80923 points

    Hi Ikeda-san,

    This is described in the datasheet section "Power Supply Requirements":

    9 Power Supply Requirements

    The BQ76952 device draws its supply current from the BAT pin, which is typically connected to the top of stack point through a series diode, to protect against any fault within the device resulting in unintended charging of the pack. A series resistor and capacitor is included to lowpass filter fast variations on the stack voltage. During a short circuit event, the stack voltage may be momentarily pulled to a very low voltage before the protection FETs are disabled. In this case, the charge on the BAT pin capacitor will temporarily support the BQ76952 device's supply current, to avoid the device losing power.

    Best regards,

    Matt