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LP-AM243: Launchpad Power Source from BoosterPack

Abdul Razak
Prodigy 135 points
Part Number: LP-AM243
Other Parts Discussed in Thread: TPS22965

we are interfacing AM243 Launchpad with our Board.

whether it is possible to power ON the Launchpad with External Power Supply through BoosterPack Pin's (+5V >>J3.21 and J7.61) by removing R161, R162.
This is to avoid the external power adapter (Through Type-C) of Launchpad.


Reference Document: 1. AM243 Launchpad User guide (E3)
2. Schematic (PROC109 LP AM243) Rev (A)

4101.AM243x LaunchPad Development Kit User Guide.pdf

5661.PROC109A(001)_SCH.pdf

  • 0
    TI__Mastermind 22685 points

    Hi Abdul,

    First, please make sure you are using the correct schematics for your LaunchPad.  If you are using a Revision E3 LP-AM243, please make sure you are referencing the E3 schematics and not the Rev A schematics.

    Also, I assume you mean R163 instead of R162.  R163 shorts the BoosterPack Header Site 2 3.3V pin to the VSYS_3V3 rail.

    However, the above notes aside, the short answer to your question is no, you should not try to power the LP-AM243 through the BoosterPack header.  The TPS22965 power switch that gates power from the USB C connector to the VSYS_5V0 rail is not designed to support a solution where there is voltage on the VOUT pins (from a different source) while the VIN, ON, and VBIAS lines are not powered as the body diode on the TPS22965 would provide a reverse current path through the power switch that may potentially damage the TPS22965 device, breaking normal operation of the LP-AM243.

    Thanks,
    Mike

  • 0 in reply to Mike Pridgen
    Prodigy 135 points

    Hi Mike,

    Thanks for the response.

    Noted with Reference schematic.

    Can we supply power through Booster Pack by removing "TPS22965" ?

     

    Thank You

    Abdul Razak.

  • +1 in reply to Abdul Razak
    TI__Mastermind 22685 points

    Hi Abdul,

    If you remove the TPS22965 (completely isolating VUSB_5V0 (comes from USB Type C connector) from VSYS_5V0, you can power the board through the VSYS_5V0 pin on BoosterPack Header 1.  Do not provide 5V to BoosterPack Header 2 as the trace between the pin and the 5V power plane on the board is extremely small and cannot support the current needed to power the LP-AM243.

    Please note that removing the TPS22965 and providing 5V directly to the BP Header bypasses the mechanism on the board that ensure the 5V supply can provide enough current, so you need to ensure your 5V source on the BoosterPack can provide sufficient current for everything on the LaunchPad.  This will be somewhat application dependent, but for reference we spec'd the USB Type C input to the LP-AM243 as need to be able to provide 5V 3A (15W).

    Thanks,
    Mike