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Original question:

BQ25170: BQ25170

BQ25170: The termination threshold of charge current

Lumina Gui
Genius 3610 points
Part Number: BQ25170
Other Parts Discussed in Thread: BQ24045,

Hi Sir,

Our customer’s smart watch product, the original project using BQ24045 for battery charging, and now the new project uses BQ25170. According to the datasheet, the cut-off charging current of BQ24045 can be set, and the cut-off charging current of BQ25170 is 10% of the set fast charging current value. 

When setting the same fast charging current value to 250mA. then set the charging cut-off current of the BQ24045 to 12.5mA, and the charging current of the BQ25170 is 25mA. When the charging is stopped, the battery power charged by the BQ25170 is relatively lower. So our customer wondering whether BQ25170 can reach the same charging power as BQ24045 if the same charging current is set.

The charging profile with thermal regulation of BQ24045 AND BQ25170 is as below.

Thanks,

Kind Regards

  • 0
    TI__Guru* 75656 points

    Hello 

    Yes the termination current for BQ25170 is fixed at 10% of fast charge current while the BQ24045 termination current (% of fast charge) can be set using an external resistor.   

    If the customer was using 5% for BQ24045 and now has 10% for BQ25170 the total charge will be slightly lower.  But the exact amount will depend on the battery and it will be best to contact the manufacturer to determine change in total charge. 

    UPDATE--- Typically the CC phase will change the battery to 90% capacity.  The CV phase then represents 10% of total capacity,  The change in termination current from 5% to 10% will  then only represent a small change in the roughly 10%.