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BQ25071-Q1: VBAT(OVCH) voltage

PAN-M
Mastermind 8375 points
Part Number: BQ25071-Q1
Other Parts Discussed in Thread: BQ25071

Dear all.

The VBAT(OVCH) of this device is 3.81V max.
In contrast, the maximum charge voltage of the phosphate iron battery is all 3.65V.
Why is this setting voltage high?

Best Regards,
PAN-M

  • 0
    TI__Guru 68686 points
    Hello
    The LiFePO4 charge profile bq25071 -Q1 will use is constant current fast charge until battery voltage reaches VBAT(OVCH), 3.7V typical then terminates charge. After that point the bq25071-Q1 enters Float-Voltage Regulation Phase and output voltage is VBAT(REG) 3.5V typical. Output is held at this value. See Data Sheet figure 10.

    The maximum voltage on the cell could be higher during charge vs float condition.