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BQ25703A: Power supply path

Vincent Li00
Intellectual 2035 points

Part Number: BQ25703A
Other Parts Discussed in Thread: BQ25703

Hi Guys

our customer is evaluating our bq25703 as battery charger. Here is a question about the power supply way:

When we don't plug usb adapter to charger but we have battery, can our IC operate? or partly operate?  

My understanding is our IC power on by VBUS or VSYS? right? If we have battery connected, even we don't have usb adapter input. Our IC internal logic is still working on. right?  I2C can still operate and can communicate with MCU, right?

If not, could you tell me how to make I2C operate when no USB adpater plug in?

Thanks

-Vincent

  • 0
    TI__Intellectual 2035 points

    another point here: If we only have battery power on this IC, which part can operate normally for our IC?

    Thanks

    -Vincent

  • 0 in reply to Vincent Li00
    TI__Expert 3320 points

    Hi Vincent,

    Your understanding is correct. BQ25703 can get running power from both VBUS and VBAT  terminal. All the I2C communicate can still work when adapter is disconnected. 

    When there is battery only, by default we will enable low power mode to minimize quiescent current(Only BATFET is turned on to supplement system, I2C circuit is also able to communicate). But you can always get out of low power mode by setting REG0x01[7]=0. Then all the normal function circuit should be alive.

    Regards