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BQ24038: the length from BAT pin to battery

Takao Yamamoto5
Expert 1690 points
Part Number: BQ24038

Dear all,

Do you have the recommended length from BAT pin to battery?

I think that there is no recommendation because of voltage drop and battery specification.

Best regards,

  • 0
    TI__Guru 65846 points
    The resistance in the trace will cause a couple of problems:
    1.) Lower efficiency due to DCR loss
    2.) Longer charge time, Voltage taper will start sooner than expected and last longer.

    The bq51038 will start voltage taper when it sees 4.2V/4.35V at output pin of IC but voltage at battery will be lower due to voltage drop in trace.

    Wider trace with less resistance is better, if possible.