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BQ25601: What is the Minimum input and output capacitance required for the bq part.

Jeff Coletti
Expert 8755 points
Part Number: BQ25601

Hi Support Team

My Customer has a question regarding the what the minimum capacitance is required for operation on the bq charger. They are having a serious issue getting cap and are being forced by their manufacturer to use smaller sized cap. When using the smaller caps they are finding that the "real effective" capacitance is much smaller than expected due to the voltage coeff. So for example an 0805 10uf cap when switched to a 0605 10uf may be as low as 2uf in their system (with a charging voltage of 12v). This is a very high volume application and they need to understand minimum requirements for stability. 

Thanks

Jeff Coletti

  • 0
    TI__Expert 5590 points
    Jeff:

    Capacitance is recommended in the datasheet block diagram or schematic. Based on that, there is some margin for capacitance de-rating. For bq25601, the smallest effective capacitance on both input and output should not be lower than 4.7uF in any conditions.