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TPS25982: Can the TPS25982 be disabled when the output is energized by another supply?

Kirk @ Santa Clara
Prodigy 90 points
Part Number: TPS25982

Dear TI,

I am trying to use the TPS25982 not only as a eFuse, but as a power switch between two power supplies.

Looking at my diagram, PS 2 is the default power supply and PS 1 would usually not be active.  If PS 1 is plugged in, then logic would pull the EN/UVLO pin of TPS25982 low, cutting off power from PS 2.  The system would also need to work with only PS 1 plugged in.

There is no need for bidirectional current and the power and ground would never be swapped.

Please let me know if this arrangement is "safe" or if I need to put ideal diodes between the eFuses and the load.  Thank you!

-Kirk

  • 0
    TI__Guru 57737 points

    Hi Kirk,

    Welcome to e2e!

    Thanks for reaching out to us. For some reason the image you have shared has not uploaded  properly. Can you upload it again using the attachment button in .PNG format. 

    I would be able to comment better once you upload the image. 

  • 0 in reply to Kirk @ Santa Clara
    TI__Guru 57737 points

    Hi Kirk,

    Thanks for sharing the block diagram.

    In this configuration there is possibility of reverse current flow from output to Input of a power supply which is turned OFF and slightly lower than the other power supply(which is connected to OUT). This is not a recommended condition.

    In this case, we would recommend to use an IC which has back to back FET's and can block reverse current when turned OFF.

    We have an integrated device which has back-to-back FET's, allows zero reverse current at all conditions and can support upto 5.5A of continuous load current. This device would be a right fit here. We are releasing this part within a week from now. Do let me know if you are interested in this part.

  • 0 in reply to Praveen GD
    Prodigy 90 points

    Please let me know about the part with back-to-back FETs.

    This resolved my issue.  Thank you.