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Original question:

BQ24040: BQ2404X minimum charge current

BQ24040: Will adding a small resistor between the charging IC and the battery cause abnormal charging detection

Lumina Gui
Genius 3650 points
Part Number: BQ24040

Tool/software:

Dear TI Engineer,

We have a question about the charging detection of BQ24040, that is, will adding a small resistor between the charging IC and the battery will cause abnormal charging detection? What we are thinking about is that there will be a voltage on the increased resistor, which may cause false detection of the battery being fully charged (reaching the set charging voltage), but in reality, the battery voltage has not reached the set charging voltage. Will the charging indicator light display abnormally at this time?

Also, we would like to know where VO (REG) and I (TERM) are sampled from? Is VO (REG) sampled from inside the OUT pin?

Thanks,

Kind Regards

  • 0
    TI__Mastermind 40375 points

    Hello,

    Any resistance in the OUT path will increase loss, increasing charging time. That being said, the device does have voltage regulation phase where the charge current is tapered down. If the termination current is set too high, the terminal voltage of the battery could be less than the regulation voltage due to the voltage drop across the the resistance.

    Both the output voltage and termination current are measured through the OUT pin.

    Regards,

    Mike Emanuel