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BQ24610: Related to application of Tantalum capacitor

Nayoung Choi
Prodigy 10 points
Part Number: BQ24610

I designed a 6cell lithium polymer battery charging circuit using the BQ24610.
I am using a 28V adapter and the battery is 25.2V when fully charged.
It is designed not to use DPM.

However, when the battery is connected without an adapter, one of C1, C2, C11, and C12 is randomly broken.

The recommended circuit says to use ceramic capacitors. Is using tantalum capacitors causing problems?

Please check if there are any other problems with the circuit.
please answer about my question.

BQ24610_CIRCUIT.pdf

  • 0
    TI__Guru*** 136950 points

    Hi Nayoung,

    I don't see any other issues with the schematic.  Tantalum caps typically have higher ESR than ceramic caps with their ESR <=50mohm).  High ESR is never recommended for the input caps to a buck converter.  Not sure why battery hot plug would cause an issue unless the ringing at hotplug is so high that it exceeds 50V rating but that seems unlikely.  There will be a current surge input those caps at battery hot plug.  That may be the issue.  I recommend changing to ceramic capacitors.

    Regards,

    Jeff