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BQ51050B: Issue with BQ51050B Not Restarting Charging After Battery Protection Cut-Off

Marc GEORGIN
Prodigy 40 points
Part Number: BQ51050B

Tool/software:

Hello,

I am designing a circuit with a lithium-ion battery and using the BQ51050B for wireless charging. The battery includes a protection circuit, which cuts off the connection when the voltage drops too low.

When this happens, I can manually restore the battery using a lab power supply, but the BQ51050B does not seem to reactivate the charge on its own. Based on the datasheet, the IC should enter precharge mode when the battery voltage is below 3V, but it appears that if the battery protection circuit has disconnected it completely, the BQ51050B is unable to deliver the initial current required to "wake up" the battery.

Is there a recommended way to handle this situation with the BQ51050B? Would adding a pull-down resistor on BAT or another small circuit to pre-activate the battery help?

Thanks in advance for your help!

  • 0
    TI__Guru* 75976 points

    Hi Marc

    If the battery voltage is below 0.8V output current is limited to 18mA. But if voltage can increase above 0.8V unit will enter pre-charge state and output current increases to 20% of bulk charge current.

    We see these problems with systems that have a load connected to the battery preventing voltage from increasing.  Reducing load is a possible solution.

  • 0 in reply to Bill Johns
    Prodigy 40 points

    Thank you for your response. I will try to isolate the charging circuit from the rest of the electronic board (MCU and sensors).