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TUSB8044A: Clarification on Configuring 3A Charging Current on USB Downstream Port (TUSB8044A)

Nikunj Solanki
Prodigy 10 points

Part Number: TUSB8044A
Other Parts Discussed in Thread: TPS25910

Hello TI Team,

We are currently designing a USB hub, and we need clarification on enabling up to 3A charging current on the downstream port.

Our goal is to make the design cost-effective, so we are not planning to use a USB PD controller. We would like to know if it is sufficient to use only a pull-up resistor on the CC pin (USB Type-C) to advertise and control the desired current level.

Specifically, we want to confirm:

  1. Whether using a pull-up resistor (Rp) alone can reliably indicate a 3A current capability to the connected device, in compliance with the USB Type-C specification.

  2. Recommended implementation or reference design for sourcing 3A charging current without a dedicated PD controller.

  3. Suggestions for an appropriate power/current switch device that can safely handle 3A continuous current per port and is compatible with the TUSB8044A.

Our objective is to implement a cost-optimized Type-C downstream port with charging support up to 3A while maintaining compliance with USB specifications.

Any guidance or reference schematics would be greatly appreciated.

Best regards,
Nikunj

  • 0
    TI__Guru**** 163261 points

    Hi  Nikunj:

        For type-C port, if just  pull-up resistor (Rp) on CC alone , it will only get default current for 900mA for USB3 or 500mA for USB2. To support 3A, you do need CC controller.

        for power switch, TPS25910 can  support up to  6.5A.

    Best

    Brian

       

  • 0 in reply to Brian Zhou
    Prodigy 10 points

    Hello Brian Zhou,

    Thank you for your reply.

    Following up on my previous thread, based on our requirements, I need to design the system as outlined below:

    1. Upstream Port:

      • Charging requirement: up to 100W (20V, 5A)

      • Functionality: Must support charging and data streaming simultaneously

    2. Downstream Ports (Two Ports):

      • Charging requirement: up to 15W (5V, 3A) per port

      • Functionality: Must support charging and data streaming simultaneously

    For this design, we have selected the following components:

    • PD Controller: TPS25751DREFR

    • Hub Controller IC: TUSB8044A

    • USB Type-C Configuration IC: TUSB320LAIRWBR

    I have attached the updated block diagram for reference. Could you please validate whether this selection meets our requirements for both charging and simultaneous high-speed data streaming on the upstream and both downstream ports? Any guidance or suggestions to optimize the design would be highly appreciated.

    Thank you for your support.

  • 0 in reply to Nikunj Solanki
    TI__Guru**** 163261 points

    Hi  Nikunj:

      The block diagram looks good .

    Best

    Brian

  • 0 in reply to Brian Zhou
    Prodigy 10 points

    Hi Brian,

    Thanks for the update. Glad to hear the block diagram looks good.

    Just to reconfirm — charging and high-speed data streaming will work simultaneously with this setup, correct?

    Best regards,
    Nikunj

  • 0 in reply to Nikunj Solanki
    TI__Guru**** 163261 points

    Correct.

    Best

    brian