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Input Current of a battery charging IC

Arturo Villasenor
Prodigy 30 points
Other Parts Discussed in Thread: BQ24125

What does the input current of the BQ24125 have to be? 

Does the charging current depend on the input current?

  • 0
    TI__Expert 3160 points
    Hi Arturo,

    The input power available must be greater than the output power requested. You can set the fast charge current using the ISET1 pin and ISET2 can be used to set precharge and termination charge currents.

    Thanks,
    Rachel
  • 0 in reply to Rachel Moore
    Prodigy 30 points

    Thank you for your response!

    And if I'm correct the current charge can be set between 150mA-2000mA correct?

    Also, is there any way to calculate how much higher the input current must be than the output current? I'm guessing this has to do with the efficiency? 

    Thank you

  • 0 in reply to Arturo Villasenor
    TI__Expert 3160 points
    Arturo,

    You're correct that the charge current can be set between 150mA and 2A.

    In addition to losses in charger efficiency you also need to consider that every part in your system will have losses and variability including your adapter. For repeatable performance, it's best to leave a decent margin of overhead or you can look at some of our newer parts with will be more robust to input power variability such as the bq2417x or the bq2429x families.

    Thanks,
    Rachel