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BQ24045: BQ24045 Abnormal charging indication

Star Xu
Genius 9645 points
Part Number: BQ24045

Hi 

The customer design with BQ24045, they use USB to charge 120mAh lithium battery. charging current setting: 120mA, R_ISET = 4.7KΩ, R_PRE-TERM = 2KΩ.

Phenomenon: Charge with a single lithium battery, charge to above 4.2V, and it has been in a trickle state, and the charging indicator CHG red light has been on for more than 24 hours.


Resistor resistance R_ISET = 4.7KΩ, R_PRE-TERM = 2KΩ

Please help check it.

Waiting for your reply.

Thanks

Star

  • 0
    TI__Guru 71146 points

    Hi Star

    The schematic looks OK.

    BQ2404X family of devices has TTDM mode which will disable termination if TS is open.  R1 (10k) is installed ?

    What is voltage at ISET during this time, indication of current going to battery?