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BQ24715: BQ24715 Question consultation

Jack Su1
Intellectual 300 points
Part Number: BQ24715
Other Parts Discussed in Thread: BQ24773, BQ24780S, BQ24770

1. When is batdrv signal low and high? What is the voltage value when it is high?

2. How does bq24715 detect whether the battery is in or not?

It is found that the temperature of the output inductor is normal when only the battery is used; the temperature of the output inductor is very high when there is only external power supply (type C)

When there is no battery in the measurement, the discharge MOS of the battery is not completely closed, gate 5.4v, source 8.7v; then the upper and lower bridge MOS are also working all the time, and the output voltage is adjusted to 8.7v

  • 0
    TI__Genius 11850 points

    Hi Jack,

    1) /BATDRV goes low (SRN - 6V) to turn on the BATFET when the BQ24715 is operating in battery-only mode (adapter not present), or when the BQ24715 is fast charging the battery. /BATDRV goes high (SRN) to turn off the BATFET when charging is disabled. The BATFET can also operate in linear mode in order to regulate VSYS above the MinSystemVoltage() setting, as described below:

    2) On its own, the BQ24715 cannot detect whether the battery is present. Unlike some of our newer chargers, there is no register that indicates this. Instead, the host MCU should determine whether the battery is present and control the BQ24715 accordingly. The BQ24715 datasheet recommends disabling charge and setting the ChargeCurrent() register to zero when the battery is absent in order to reduce the risk of overcharging the battery when the battery is inserted.

    You can also pull the CELL pin to GND when the battery is removed. Pulling CELL to GND will cause the BQ24715 to exit LEARN mode, disable charging, and reset several registers, as shown below. This is very similar to the /BATPRES functionality on the BQ24770, BQ24773, and BQ24780S chargers.

    Best regards,

    Angelo