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BQ24297: how to set power off charging current

user5849589
Prodigy 10 points
Part Number: BQ24297
Other Parts Discussed in Thread: BQ24133

I set ILIM to 1.8A.When charging a low voltage battery,the current get to 1.8A immediately at trickle charge mode and precharge mode?How should i set the charging current when power off charging to reduce charging current?For bq24133, the precharge current is set as 10% of the fast charge rate set by ISET voltage.Does bq24297 has similar setting?

  • 0
    TI__Expert 8230 points
    Hello,

    The input current limit doesn't control the charge current directly. In order to set the charge current limits, REG02[7:2] and REG03 must be used.

    REG02 controls fast charging current and REG03 controls precharge and termination current. Please refer to the register maps on the datasheet, section 9.6 for the full details.

    The device uses the battery voltage to determine which charging state to go into. If VBAT<2V, it will be in trickle charge. Between 2V and 3V, it will be in precharge. Higher than 3V, it will enter fast charging until the battery reaches CV.