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TPS25730: Enabling buck converters (TPS565201 and TPS563201) when VBUS power is good

Lippold Haken
Prodigy 50 points
Part Number: TPS25730
Other Parts Discussed in Thread: TPS565201, TPS563201,

Tool/software:

I need to update the design for a device that requires 15V at 20W:

  • The design currently uses the NRND AP3371 to negotiate PD 15V at 20W
  • POWEN (AP3371 pin23) is connected to EN of two buck converters (TPS565201 pin5 and TPS563201 pin5)
  • power from VBUS does not connect to any other circuits

I am considering switching to TI for this part (as I have done with most other parts).   I have two questions:

  1. Can you recommend which output from the TPS25730 I should use to control the buck converter?
  2. Is there a different simple TI part for USB sink PD in TSSOP or similar package?  CH224K-style package has advantages for me.
  • 0
    TI__Mastermind 22405 points

    Hi Lippold,

    Lippold Haken said:
    Can you recommend which output from the TPS25730 I should use to control the buck converter?

    When are you expecting the EN pin of the buck converters to be set?

    The TPS25730 is limited to the GPIOs available in the datasheet. Some options are to tie the Enable pins to PPHV, the system side of the VBUS rail or to use the PLUG_EVENT or !SINK_EN pins.

    Lippold Haken said:
    Is there a different simple TI part for USB sink PD in TSSOP or similar package?  CH224K-style package has advantages for me.

    Unfortunately, we do not have a USB-C PD part in the TSSOP package.

    Thanks and Regards,

    Chris

  • 0 in reply to Christopher Lim1
    Prodigy 50 points

    Thanks!  I think I will use a resistor divider on VBUS to activate the enable when 15V is present.