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BQ24103A: Battery Failures

JDJ
Expert 3791 points
Part Number: BQ24103A

When the battery is fully charged, is there any residual current? Or is it off?

Also, can you please verify the following: 

CELLS_FB=VCC

ISET1=5.23K

ISET2=10K

The sense resistor is 100mOhm

Any input is appreciated! 

Thanks,

Jack

  • 0
    TI__Expert 3791 points

    Also after the battery is fully charged, how does the charger disconnect from the battery? 

  • 0 in reply to JDJ
    TI__Guru**** 151535 points

    Hi Jack,

    From you external components below:

    CELLS_FB=VCC -> VBATREG=8.4V

    RISET1=5.23K - > ICHRG = KISET1* VISET1 / (RSNS * RISET1) = 1k V/A* 1V /(0.1ohm*5.23kohm) = 1.91A

    With RSNS = 100mohm => VRSNS = ICHARGE*RSNS = 1.9A*100mohm = 191mV - okay since between 100mV and 200mV

    RISET2=10K -> IPRECHRG = KISET2* VISET2 / (RSNS * RISET2) = 1k V/A* 0.1V /(0.1ohm*10kohm) = 0.1A

    With RSNS = 100mohm => VRSNS = IPRECHARGE*RSNS = 0.1A*100mohm = 10mV - very low and will likely widen the IPRECHRG regulation accuracy than datasheet +/- 20%.

    When charge is complete, the charger does not disconnect from the battery. From the spec excerpt below, ISLP into SNS, BAT and OUT pins is 5.5 uA max.  If input power still attached, VCC pulls 5mA if /CE is low.  This can be reduced to 315uA if /CE is pulled high.

    Regards,

    Jeff