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TPS22901: Placed wrong by supplier, advice on bypass

Rob Hoeks
Prodigy 90 points
Part Number: TPS22901

Hey,

We are using the TPS22910 in one of our prototypes. We received 4 boards on which one has the TPS2991 rotated by 90 degrees.

We tested with the other board and the component works fine. For further testing it could work for us to simply bypass the device, but i'm not sure what will happen.

So the component is rotated 90 degrees, meaning that the:

Vin pin is now on the "ON" location

ON pin is now on the "GND" location

GND pin is now on the VOUT location

VOUT pin is now on the VIN location.

To bypass the device i'm thinking to basically make a link between the original VOUT and VIN location. What will happen with the device? will this create a short to GND somewhere?

Ofcourse sending back to my supplier and let them fix it is better, but i don't have time for that nor do we have the tools to repair it ourselves, unfortunately.

Kind regards,

Rob

  • 0
    TI__Mastermind 32650 points

    Hi Rob,

    I understand your predicament with the incorrectly populated device. As you mentioned, repopulating this device would be the best option.

    At this time, with the way the device is populated, it is unpowered (since it powers from VIN) and will remain so as long as ON rail is held low.

    If you  were to connect VIN and VOUT of your board, it would connect GND and VOUT on the device. I think that this could lead to unexpected operation as the GND pin is not meant to see a high voltage. 

    I believe the best course of action would be to depopulate the device before rerouting. If this is not possible, the other option would be to cut the traces around the device to leave it floating before making any connections.

    There is no way to use this device in this incorrect configuration without substantial workarounds to the board.