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BQ25125: Question regarding minimum charge voltage for a given VBATREG

Nicholas Amore
Prodigy 20 points
Part Number: BQ25125

Hello had a question regarding the BQ25125 chip. When charging the battery the user programs in a VBATREG value that determines the constant voltage value at the termination of the charge cycle. My question is what is the dropout between the VBATREG value and the charger input? I am having a hard time determining it from the datasheet. For example, in my application our CV is 4.2V. What would be the minimum value we would need to supply in order for the charge cycle to properly function? We want to make sure our supply tolerance does not push us out of range.

  • +1
    TI__Expert 8245 points

    Hi Nicholas,

    This is unfortunately not a super straightforward answer as DPPM and the sys load may affect the minimum input voltage required in your application. I would recommend applying the largest sys load you expect to see in your application and sweeping down VIN to observe when the device is no longer operational. Then use this value to program in an appropriate VINDPM setting. This will ensure that no matter what is occurring on the output side, the input voltage will not drop below that threshold.

    Thanks,

    Jackson

  • 0 in reply to Jackson DiGiovanna
    Prodigy 20 points

    I was able to perform this testing and come to a conclusion. Thank you very much!