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Original question:

BQ24618: Reliability improvements

BQ24618: Reliability issues

Boris Yanchev
Prodigy 110 points
Part Number: BQ24618

Hi,

This is related to my previous question regarding BQ24618 as I have been looking into the design again.

The BQ24618 circuit is part of a larger charger design which has had two versions. The circuit I shared previously is almost identical between the two versions, the major change being the input to the circuit: Version 1 had no reliability issues and used a conventional DC adapter, whereas version 2 uses USB PD. Both provide 20V, however the USB-C has a slower rise time (~150us vs ~25ms).

Does BQ24618 have any requirements regarding input voltage ramp up time? Could the slower rise in the second version cause these random failures and is it worthwhile to implement a separate enable circuit?

Thank you for your help!

  • 0
    TI__Genius 13495 points

    Hello Boris,

    Boris Yanchev said:
    Does BQ24618 have any requirements regarding input voltage ramp up time? Could the slower rise in the second version cause these random failures and is it worthwhile to implement a separate enable circuit?

    We don't have a requirement for input voltage ramp up time, this is not something that we test, so I can't confirm if this is what caused the reliability issue. However based on the information given, I do think this could be a possibility and adding the separate enable circuit could fix the issue.

    Best Regards,

    Christian.