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TPS27SA08: max current through body diode?

Hans
Genius 12865 points
Part Number: TPS27SA08

Hello Team,

may I kindly ask you to provide the max current through the body diode in case reverse current is flowing while disabled, please?

Thank you and Best Regards, Hans

  • 0
    TI__Mastermind 27265 points

    Hans,

    We don't actually rate the body diode current as it's considered a parasitic path and the device isn't designed to have significant reverse current going through the FET. In the case of a reverse supply condition, the main FET actually turns on so that the power is dissipated over the main FET versus the body diode here.

    Best Regards,
    Tim

  • 0 in reply to Timothy Logan
    TI__Genius 12865 points

    Hi Tim,

    even if the device is disabled the FET turns on?

    Thank you, Hans

  • +1 in reply to Hans
    TI__Mastermind 27265 points

    Hans,

    Yes. The point here is that the exact current/power capability of the body diode is not characterized, however it is a lot less than the actual power FET itself. During a reverse supply condition we want the power to be dissipated over the main FET and not the body diode. Note that in order for automatic turn-on to occur, SEL1 cannot be floated or pulled high and must have some sort of path to ground (either pulled or through an MCU). 

    Best Regards,
    Tim