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TUSB8044A: Should we use a PD controller for charging a downstream port with 5 V, 4 A?

Chauhan Mihir
Prodigy 135 points

Part Number: TUSB8044A
Other Parts Discussed in Thread: TPS2559

Hello TI Support Team,

My name is Mihir Chauhan and I am working at Aimtron Technologies as a Senior Hardware Design Engineer.

Currently I am working on a new project which is in the design phase. We have to design a USB hub using the TUSB8044A from TI, which must support downstream ports of Type-C USB 3.2 and must be able to charge a device at 5 V and 4 A. The hub will also need power-distribution control and current limiting, for which we are considering the TPS2559 power-switch/current-limit controller from TI.

In this context, is it necessary to connect a PD (Power Delivery) controller to the downstream Type-C port in order to support charging at 5 V and 4 A? Or can we simply use pull-resistors on the CC pin of the Type-C interface to advertise the required current draw (4 A) and rely on the hub’s power-distribution switch (TPS2559) and hub controller (TUSB8044A) to manage the power safely?

Thank you for your support and guidance.

Best regards,
Mihir Chauhan

  • 0
    TI__Guru**** 161706 points

    HI Mihir:

        yes, for 4A current , PD controller is needed. CC controller can support up to 3A.

    Best

    Brian

  • 0 in reply to Brian Zhou
    Prodigy 135 points

    Hello Brian,

    Thank you for quick response and share valuable information.

    As per your reaccommodation we will used PD controller for 4A charging and CC controller if our requirement is charging current up to 3A.

    But in case our, aim is to design cost effective product. Then can we use pull up resistor on CC pin (on type C USB connector) for charging current up to 3A.?

    Best Regards,

    Mihir

  • 0 in reply to Chauhan Mihir
    TI__Guru**** 161706 points

    TUSB8044A does support BC1.2 DCP mode, which can support up to 3A. but to support DCP, hub upstream port has to be disconnected, this will lose data transfer.

    To support 3A current, with type-C,  you do need CC controller.  If you just  pull up resistor on CC pin, it only support default current up to 900mA.

    Best

    Brian

  • 0 in reply to Brian Zhou
    Prodigy 135 points

    Hello Brian,

    Thank you for sharing valuable information and your guidance.

    I will go with PD controller and now I am going to close ticket.

    If anything I will generate new ticket.

    Regards

    Mihir