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TPS25948: Forward and reverse power mux application

Yishan Chen
Intellectual 1740 points
Part Number: TPS25948

Tool/software:

Hi Team,

Do TPS25948 support forward power mux and reverse power mux?

For example, 2 Input source with 1 output bus use two TPS25948. The channel can be chosen by MCU.(MCU can decide which channel is turned on)

In reverse mode, 1 input bus with 2 channel output bus, MCU can also chose which one is turned on.

By the way, in reverse mode, does TPS25948 still support over current protection? Is this OC function achieved by detecting the input current(output Pin)?

Thank you,

Yishan Chen

  • 0
    TI__Intellectual 1740 points

    Add more questions:

    Could TPS25948 achieve below application scenario at the same time?

    Two power source, choose the high voltage source to power the load, and the high voltage power source won't have reverse current to low voltage power source.

    (Need TPS25948 to achieve it, because the MCU don't bring up at this moment)

    Once we randomly unplug one power source, another one will start to power the load.

  • 0 in reply to Yishan Chen
    TI__Mastermind 39135 points

    Hi Yishan,

    Yishan Chen said:

    For example, 2 Input source with 1 output bus use two TPS25948. The channel can be chosen by MCU.(MCU can decide which channel is turned on)

    In reverse mode, 1 input bus with 2 channel output bus, MCU can also chose which one is turned on.

    With the help of MCU, this can be done.

    Yishan Chen said:
    By the way, in reverse mode, does TPS25948 still support over current protection? Is this OC function achieved by detecting the input current(output Pin)?

    No, OCP is only from IN to OUT direction. OCP is achieved using current mirror in the main power path inside the device. We have plans for bidirectional OCP in future roadmap devices.

    Yishan Chen said:

    Two power source, choose the high voltage source to power the load, and the high voltage power source won't have reverse current to low voltage power source.

    (Need TPS25948 to achieve it, because the MCU don't bring up at this moment)

    Once we randomly unplug one power source, another one will start to power the load.

    This just looks like regular Active Oring scenario. This is possible. I don't see how this is related to above mentioned reverse power muxing. Check section 8.4 in the datasheet.

    Best Regards,
    Arush