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BQ25170J: BQ25170J Charge/Discharge behavior with 0V charge function of PCM

Shawn Zhou
Prodigy 90 points
Part Number: BQ25170J

Tool/software:

Dear Sir,
We have a question for BQ25170J Charge/Discharge behavior with 0V charge function of PCM. (battery protection board)
The system application is if the battery pack has 0V charge function of PCM, could you share the charge/discharge behavior with us?
Thank you.
e.g.
Pre-charge >> 
CC>>
CV>>

1. Battery voltage = 2.9~3.1 V 

2. Battery voltage = 1.8~2.9V

3. Battery voltage = lower than 1.8V

4. Battery voltage = 0V

5. Battery voltage = Floating (Open)

Best Regards
Shawn
  • 0
    TI__Guru* 75606 points

    Hi Shawn

    Shawn Zhou said:
    The system application is if the battery pack has 0V charge function of PCM, could you share the charge/discharge behavior with us?

    The BQ25170J has four charge phases:

    1.) Trickle Charge, Vbat 0V to 2.2V and current limited to 16mA

    2.) Pre-Charge, Vbat 2.2V to 2.8V and current is 20% of ISET (Fast Charge)

    3.) Fast-Charge (CC), Vbat 2.8V to VSET and current is ISET

    4.) Taper-Charge (CV), Vbat VSET and current is below ISET and decreasing.

    During Discharge:

    1.) When battery voltage 100mV below VSET Recharge will start