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TPS25221: Reverse current blocking

Kazuo Aihara
Prodigy 10 points
Part Number: TPS25221


Tool/software:

Hello,

The TPS25221 has a reverse current blocking function, but is there any leakage from the body diode of the built-in FET?

Will the reverse current be blocked if the enable pin is set below the threshold of 0.8V?

Incidentally, is the FET body diode from OUT to IN? Or from IN to OUT?

Thank you in advance.

  • 0
    TI__Expert 7591 points

    Hi Kazuo,

    The datasheet doesn't have much description on the this topic. "Reverse Current Blocking (when disabled) " seems to be the only description.

    My guess is an additional MOSFET is used for the blocking (forming a bidirectional circuit breaker with the main fet) and it turns off when being disabled. The main N MOSFET body diode should be out to in, and the body diode of this additional one is from in to out.

    The reverse current will ONLY be blocked if the enable pin is set below the threshold of 0.8V.

    BR,

    Ke Wang

  • 0 in reply to Ke Wang
    Prodigy 10 points

    Thank you for your reply.
    Could you please give me an answer that is not just guesswork?
    I am considering using a Current Limited Switch to control the power supply to the DisplayPort power supply pin. One of the things I need to do is to prevent current from flowing back when the board is turned off.
    I apologize for the inconvenience. Thank you in advance.
    That's all.

  • 0 in reply to Kazuo Aihara
    TI__Expert 7591 points

    Hi Kazuo,

    Unfortunately I don't have a clear answer now due to the lack of information. Please refer to the datasheet and treat the device as it can do "Reverse Current Blocking (when disabled) ".

    BR,

    Ke Wang