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BQ25306: Audible noise

David Park
Expert 5400 points
Part Number: BQ25306

Hi,

There is audible noise in BQ25306 when current is 1A~3A.

It's disappeared when charging current is under 1A at CV mode after CC mode.

Due to small application, it's difficult to provide waveform.

When C40 FF capacitor is increased, there is no improvement.

I attached schematic.

Thanks.

  • 0
    TI__Mastermind 24075 points

    Hi,

       Can you try replacing inductor? There have been some issues with inductor selection resulting in noise. Do you have the datasheet of the inductor used? I could not find it online. Is PMID capacitor placed as close as possible to PMID pin of IC? Try adding a high frequency decoupling capacitor (0.1uF) to both VBUS and PMID as well and test.