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TPS2115: Reverse blocking / applying secondary power supply on OUT

Chris Schramm
Intellectual 590 points
Part Number: TPS2115
Other Parts Discussed in Thread: TPS63000, , , TPS2121

Dear TI-Team,

we have a total of three power sources: USB (when debugging), PV (with small buffer battery) and a large li-ion battery. TPS2115 selects between PV and battery, after that there's a TPS63000 BuckBoost. But I'm looking for a way to allow USB to supply the power to TPS63000 when I'm working with the unit on my desk. In these cases, PV and Batt are disconnected so from my perspective it would be okay to apply USB power directly to OUT (pin 7). I see that TPS2115 already implements reverse-conduction blocking, but it looks like it is specifically meant for switching between INx. Please advise, is it safe to apply power at OUT?

I know I could use two TPS2115 but that would mean double the resistance, double the cost and double the real estate.

  • 0
    TI__Genius 10855 points

    Hey Chris,

    Thanks for reaching out on E2E!

    Yes, the TPS2115A should be able to block reverse current when there's voltage on the output.

    I also recommend using the TPS2121 for this application since it comes with additional protection features such as thermal shutdown, overvoltage protection, and priority power muxing.

    Thanks,

    Arthur Huang

    To find the latest information on Power Switches, visit www.ti.com/powerswitch

    Please click "This resolved my issue" button if this post answers your question.

  • 0 in reply to Alpha H
    Intellectual 590 points
    Arthur, thanks for the quick reply!

    I've seen TPS2121 but it has higher Iq