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TPS25741: Can this power a 3A circuit at 5V from the USB Bus?

Eric Smith90
Prodigy 30 points
Part Number: TPS25741
Other Parts Discussed in Thread: TUSB320

I am designing a product that will implement a USB C receptacle. My requirements are below:

  • Powered by USB Bus (5V) from USB C receptacle
  • Needs to handle 3A of current
  • Needs to support either USB 2.0, 3.0, or 3.1 USB protocols to communicate with the device
  • Different types of cables can be plugged into the device from a PC (A to C, C to C, etc)

I am still learning about USB C protocol and the power delivery specs. From what I can see from the TPS25741 device, this should be able to handle the specs that I need. My major concern is regarding the USB A to C cable from a PC. If I plug in a USB A to C cable from a USB 2.0 port on a PC into this device, will it be able to handle 3A of current?

  • 0
    TI__Guru 50120 points

    Hi Eric,

    I'm currently looking into this and will get back to you asap. 

    Regards,

    Jimmy Hua 

  • 0 in reply to Eric Smith90
    TI__Guru 50120 points

    Hi Eric,

    For clarification, in the power role perspective, is your laptop going to be the source and the device going to be the sink?

    The reason why I ask is because the TPS25741 is a source port controller that acts as the DFP. Because of this, the TPS25741 can not be powered by VBUS(5V) through USB C receptacle. The TPS25741 needs to be powered by a power supply brick and then any sink attached can be powered by VBUS(5V). 

    Also, the TPS25741 only communicates using USB PD 2.0 protocol and never touches the D+/D- lines. 

    Regards,

    Jimmy Hua 

  • 0 in reply to Jimmy Hua
    Prodigy 30 points
    Hi Jimmy,

    You are correct. The laptop/PC will be the source and the PCB will be the sink. I didn't realize that this was just a source. Do you have a source product that could do this? Or is it even possible?

    As for the D+/D- lines, those will be going somewhere else to communicate with devices on the PCB.

    Thanks,
    Eric
  • 0 in reply to Eric Smith90
    TI__Guru 50120 points

    Hi Eric,

    If you are looking for a sink device, then I'd suggest looking into the TUSB320. It allows different mode configuration of the TUSB320 to be a DFP,UFP, or DRP. The TUSB320 would also satisfy the 3A current requirement.

    Regards,

    Jimmy Hua

    Consider checking the "Verify Answer" button if I've answered the question to your satisfaction.