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BQ21062: Behavior when there is no battery connected and there is 5 volts on the IN pin (A1).

high speed guy
Expert 3505 points
Part Number: BQ21062

Hi,

On the BQ21062 Battery Charger what its behavior when there is no battery connected and there is 5 volts on the IN pin (A1)?  Also with this condition what voltage will there be on the PMID pin((s), A2.B2))? Will the BAT pins have a voltage? Will the BAT pins source current or sink current?  Are there any other details that you feel are relevant that you would like to communicate?

Thanks,

HSG 

  • 0
    TI__Expert 5645 points

    Hi HSG, 

    1) On the BQ21062 when there is not battery connected and IN = 5V, the behavior will depend if the charging is enabled or disabled. While charge is enable, the charger will perform its function and try to charge a battery that is not present, and will end up charging the bypass capacitor on the BAT (B3) pin. You might see the bypass getting charge and discharge really quickly. If you measure with a multimeter, you'll measure the average voltage of the charging cycle. 

    2)The PMID will be regulated of the IN voltage due to the power path management, therefore you'll see the 4.5V on A2/B2 even if the battery is dead or not present. You can change the regulated voltage via I2C. 

    3)The BAT pins will have a voltage depending on the charging status. See answer #1. The BQ21062 BAT pins will be sourcing current while charging is enabled in order to charge the battery. 

    Best regards, 

    Arelis G. Guerrero