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LM2776: Charge pump IC Failure (LM2776DBVR)

Andy Kim
Prodigy 10 points
Part Number: LM2776

Tool/software:

The observed failure mode is that after some amount of time in the field (within a few days), the charge pump is no longer able to output -5V and instead outputs 0 to about -1.5V while getting quite hot. The IC is being used on a custom designed PCB

  • 0
    TI__Genius 17810 points

    Hi Andy,

    Here ae my comments/questions:

    • You could probe the flying cap to see if the IC is switching at all.
    • Can you disconnect all the output load and check if the IC is then able to startup correctly?
    • You can try replacing the failing IC with a new one to see if the board is working fine then.
    • Is the input supply a regulated supply on the same PCB or is this coming through cables/connectors?
    • Is there any chance of any input overvoltage or any positive voltage to have leaked on to the output rail|?
    • What is the failure rate? How many parts have failed and how many haven't?
    • Could you share the schematics?

    Best regards,

    Varun