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BQ24079: Bulk capacitance limit on OUT pin

Bart
Expert 6330 points
Part Number: BQ24079

Hello,

It is recommended to bypass OUT with 10 to 47 uF ceramic capacitor (page 7 in the BQ24079 datasheet, OUT pin).

Is there any capacitance limit for a bulk capacitor on OUT pin? Is 47 uF a maximum limited by internal regulator’s stability region? 

Thanks

  • 0
    TI__Guru*** 146695 points

    Hi Bart,

    In theory, you can place additional, low ESR capacitance near the charger without stability concerns.  You test stability over temperature with a load transient on OUT and observing the ringing and settling time.  If significant ringing for a long time then the additional capacitance is not stable.   However, we have not tested for higher than 47uF low ESR (ceramic) capacitance and therefore cannot warranty this operation.  

    Regards,

    Jeff