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Original question:

TPS25751: besides PP5V for Vconn , can it also used to offer power to the outer device?

TPS25751: PPHV power supply capacity need when use as source

Will Wang47
Expert 7670 points
Part Number: TPS25751
Other Parts Discussed in Thread: TPS25750

Tool/software:

Hi team,

When use TPS25751 as OTG source, supoort 5V/3A, 9V/3A, 15V/3A, 20V/5A.

Does the PP5V path need to support the 5V/3A output capacity? And PPHV support the others?

Based on following post, I though the answer is yes.

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1393804/tps25751-besides-pp5v-for-vconn-can-it-also-used-to-offer-power-to-the-outer-device/5332619?tisearch=e2e-sitesearch&keymatch=tps25751%20PP5V#5332619

However, based on the following TI design, PP5V only get 300mA/5V power capacity, and it support 5V/3A, 9V/3A, 15V/3A, 20V/5A. So it seems PP5V is not necessary for 3A capacity.

https://www.ti.com/tool/PMP41062  

The PP5V power capacity is confused to me 3A or 300mA, could you help clarify the power capacity of PP5V?

Thanks and Best Regards,

Will

  • +1
    TI__Mastermind 34256 points

    Hi Will, 

    TPS25751 has the capability to source 5V through PPHV, however PP5V still requires power for the internal CC logic and supplying Vconn (when needed). In the previous generation TPS25750 PP5V is required to source 5V/3A capability and all other higher voltage PDOs (9V and above) is sourced through PPHV. I recommend at least using a 350mA supply for PP5V for safety margins. 

    The PP5V current requirement is based on the Type-C spec for Vconn requirements shown below: 

    Thanks and Regards,

    Raymond Lin