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BQ25723: How to handle the BQ25723 charge modes

Part Number: BQ25723

The BQ25723 chip supports both CC and CV charge mode by setting it with CELL_BATPRESZ voltage and register. For 2-phase battery charge cycle, the charging start from CC then switch to CV.

How the BQ25723 switch the charge mode? Does it switches CC to CV without MCU involved? Or need the MCU to switch the mode? If the MCU register operation needed to switch the CC to CV,

how the MCU telling the battery voltage is reached the 4.2V to change the mode?

Or this chip doesn't design for 2-phase charge?

  • Hi Nan,

    BQ25723 is a host-controlled charger.

    For BQ25723, you will need a MCU to start charging because the charge current default to 0A at powerup. It does have a CC to CV transition, but the part will not terminate by itself in CV mode.

    From the datasheet:

    "When battery is full or battery is not in good condition to charge, host terminates charge by setting CHRG_INHIBIT bit to 1b, or setting ChargeCurrent() to zero."

    In summary, you don't need a MCU to do very sophisticated CC to CV transition, but you do need MCU involvement to start charging as well as to stop charging at the end of the charge cycle.

    Thanks and I hope this helps,

    Peng