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BQ25713: For dual USB-C ports system, can I charge the battery and use OTG to provide power for the second port at the same time?

Jeff Lam55
Intellectual 420 points
Part Number: BQ25713
Other Parts Discussed in Thread: BQ25703

Hi,

I am designing a system with dual USB-C ports. I wonder if I could connect a power adapter to one of the ports for charging, then use the OTG pin to provide power to the second USB-C at the same time.

The charger IC I am consider using is BQ25703 or BQ25713.

Thanks,

Jeff

  • 0
    Intellectual 420 points
    Seems like the OTG output is on the VBUS pin. Also in order to enable OTG, VBUS needs to be below V (VBUS_UVLO). This basically means I can't charge my battery and provide OTG provide at the same time.


    If this is the case, is there any TI charger IC that would allow me to charge and provide OTG at the same time?

    Thanks,
    Jeff
  • 0 in reply to Jeff Lam55
    TI__Prodigy 420 points
    The charger only has one converter channel, which works in either forward direction or reversed OTG direction. That means the charging mode and OTG mode can not happen at the same time.

    One common practice is to bypass the OTG port to the port which has an adapter plugged in. The limitation is the OTG voltage is always the same as the adapter voltage.
  • 0 in reply to Yipeng Su
    Intellectual 420 points
    That's an interesting idea. Thank you.
  • 0 in reply to Jeff Lam55
    Intellectual 270 points

    hello i have similar question i would like to use  the BQ25713 for power bank usb type-c port i would like the port to be bidirectional like the project in this link  i choosed the   BQ25713 because there are not english documentation for the southchip is the BQ25713 suitable for this prject ? can i use it bidirectional like the southchip ? on their project ?