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AM5718: AM5718 IDK PMIC IC Issue - Reg

Saravana Vikram0
Intellectual 315 points
Part Number: AM5718

Dear Team,

We have been using AM5718 IDK for our development activities. During the development, while connecting the

5V Adapter, 3.3V output Lane (VSMPS9) from the PMIC IC TPS6590377 got shorted to Ground. We have replaced the IC

with TPS6590379 using BGA Rework Station. .After BGA is replaced, we are getting 6 Ohm Impedance shown across

VMAIN and GND. 3.3V Short has gone. Xray of the IC does not any short

What could be the cause of this issue and if any changes to be done in the circuit if we need to use TPS6590379 in place of 

TPS6590377 . Highly appreciate your feedback on the same.

With Best Regards,

Vikram.

  • 0
    TI__Guru 54512 points

    Vikram,

    It's tough for me to speculate.  If the supply has been shorted any number of additional components may have been damaged.

    Regards,

    Kyle

  • 0 in reply to kcastille
    Intellectual 315 points

    Dear Kyle,

    Thanks for the reply.

    When we removed the PMIC from the board, 3.3V short also has gone. Also, there is no short in any other power supply too.

    But when we replaced the IC with new PMIC, impedance between VMAIN (5V) and GND is showing around 6 Ohm.  Also, we have

    checked after desoldering each and individual component associated with VMAIN line. 

    It is very difficult for us to understand as well

    Please note that, we have used TPS6590379 IC. Please advise.

    With Best Regards,

    Vikram.

  • 0 in reply to Saravana Vikram0
    TI__Genius 10000 points

    Vikram,

    TPS6590377 and TPS6590379 are pin-to-pin compatible so there should be no issue using the updated part number. If you have an additional working board to spare, you can try to swap a TPS6590377 and a new TPS6590379 device and verify the correct power up behavior.

    With the shorted board, there could damage on the external components around the PMIC as well as the original TPS6590377 PMIC. DId you also check for any damage on the pre-regulator?

    Thanks,

    Nastasha