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BQ24610 input over-current protection

Dong Hui
Prodigy 220 points
Other Parts Discussed in Thread: BQ24610

With the standard BQ24610 application, there are two back-to-back P-CH MOSFETs in the front end of the charger IC for over-voltage and reverse input protection. I am just wondering if these two MOSFETs can also be used for over-current protection?

For example, I have set the maximum input current via ACSET to 3.5A and the fast charging current is set to 3A. The input current sensing resistor is 0.01R. If for some reason, my system circuit tries to draw 5A current AND AC adaptor can provide this much current, will BQ24610 turn off its input via ACDDRV? Or it will just let the system draws 5A current as long as the voltage at its input is stable.

  • 0
    TI__Expert 8690 points

    Hi Dong,

    The ACSET will limit input current to 3.5A. It will not go above 3.5A, it will stay at 3.5A and, if necessary, reduce charging current down to 0A to provide enough power to system. Your AC adapter should be able to provide enough power for your system and battery though, and its advisable to have PIN= PSYS(avg)+PCHG/.9. We have a charging overcurrent protection if there is, for any reason, a short at the battery terminal.

    Thanks,
    Steven