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BQ24061 over current behavior

Michael McCormack19
Prodigy 80 points
Other Parts Discussed in Thread: BQ24061

I have an application that will consist of (mainly) a BQ24061, a lithium battery pack consisting of 2-4 18650 cells in parallel and a GMS modem.  The intended design is to have the BQ charge the battery and the modem draw power off the battery.  The GSM modem draws current in pulses of about 1.5 to 2.0 Amps.  In the event that the modem is drawing power while the unit is connected to the charger, what will the BQ do?  Its charge current is presently anticipated to be well below 1.0 Amps.

  • 0
    TI__Expert 7730 points

    BQ24061 has the input current limit of 1A. If the GSM modem is connected to the OUT/BAT pin of the charger, it will draw power directly from the charger instead of from the battery. If the charger cannot provide enough current to the GSM modem, the battery will supplement the power to it.

    Thanks,

    Wenjia

  • 0 in reply to Wenjia Liu
    Prodigy 80 points
    I understand that the current which is not provided by the BQ24061 will come from the battery pack, I am interested in the behavior of the BQ24061 during and after this event. How long with the BQ24061 be in current limit? How does the BQA24961 start charging again - does it need to be reset or will it automatically restart the charging? If it must be reset, how is that accomplished?
  • 0 in reply to Michael McCormack19
    TI__Expert 7730 points
    As long as there's a valid input connected, the chip will continuously provide the current either charging the battery or supplying the output loads. So a reset is not needed and it will charge the battery once the output doesn't demand that much current.

    Thanks,
    Wenjia