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TPS25751: PPS Inquiry

Jack Goutier
Prodigy 40 points
Part Number: TPS25751
Other Parts Discussed in Thread: BQ25798, BQ25756

Tool/software:

Hi All,

According to the datasheet, it says, "TPS25751 only supports PPS within a 5V to 21V range according to PD 3.1 specification and is enabled through the Application Customization Tool." However, the information I was able to find about the PD 3.1 standard states that it should be able to reach 3.3V. Or more specifically, 5V (3.3 - 5.9V) with 20mV steps. Does the TPS25751's nominal voltage range span from 5-21V, but its PPS can reach down to 3.3V, or is the lowest step truly at 5V?

Thanks!

Jack G

  • 0
    TI__Mastermind 34466 points

    Hi Jack, 

    The minimum PPS voltage supported on TPS25751 is 5V, this is to align with the latest PD spec 3.2 (version 1.1 released October 2024). See except from USBIF PD specificatino below for details:

    Let us know if you have any further questions or concerns! 

    Thanks and Regards,

    Raymond Lin

  • 0 in reply to Raymond Lin
    Prodigy 40 points

    Hi Raymond,

    I found a TI slideshow that notes steps can be taken down to 3.3V; I assume this means it can be done when configured with one of the BQ devices. Is that a fair assumption, or does this no longer apply?

    https://www.ti.com/lit/ml/slyp853/slyp853.pdf?ts=1756090350415

    I am looking for a USB-PD solution that sources PPS down to 3.3V and doesn't require a battery/battery charging to function. Do you think one of the BQ devices, along with the TPS25751, can work in this situation?

     

    Thanks!

    Jack G

  • 0 in reply to Jack Goutier
    TI__Mastermind 34466 points

    Hi Jack, 

    TPS25751 can only support minimum 5V for PPS, the 3.3V minimum is from an older revision of the PD specification that is outdated and no longer applicable with the current USB-PD spec (v3.2.1.1). TPS25751 can still be paired with a supported BQ device such as BQ25798 or BQ25756 (refer to datasheet for the full list) and negotiate/provide PPS source voltage from 5V up to 21V. 

    Let us know if you have any further questions or concerns! 

    Thanks and Regards,

    Raymond Lin