Understanding STUSB4761 Stand-alone USB PD controller

[implor]

I have limited experiance with USB-PD IC. I have used one by Ti before but it was very complicated and we where not impressed with it.

For my current project I need something simple to negotiate PD up to 12V. I found ST STUSB4761 that looked like it will do everything I want and is bare bones.

What I'm confused about is the power-path. It can do 5 PDO but it only has one power path (TI IC I used before had one for each voltage). So now i'm wondering it will act like a step-down converter?

Datasheet say "Regulating voltage and current according to PD contract" on page 2.
And on page 9 there is a section on Voltage regulation.
"Input voltage is sensed on VDD pin. Until a PD contract is negotiated, regulation is set to 5 V. In power delivery
mode, the regulation aligns VBUS value on negotiated voltage value. Voltage regulation accuracy is 3% worst
case."

It feels like i'm miss-interpreting the datasheet or if it can do step-down, datasheet is missing a lot of information I would expect form a dc/dc step-down datasheet.

What do you think?

[jc101]

I haven't used that particular IC. It looks like it adjusts the feed back of the primary side with the Opto_DRV output to adjust the primary output voltage.
Check the schematic in section 5.2 of the data sheet.

So when a different voltage is negotiated, it adjusts the primary side to raise the voltage. It doesn't do any DC-DC conversion itself.

[implor]

I haven't used that particular IC. It looks like it adjusts the feed back of the primary side with the Opto_DRV output to adjust the primary output voltage.
Check the schematic in section 5.2 of the data sheet.

So when a different voltage is negotiated, it adjusts the primary side to raise the voltage. It doesn't do any DC-DC conversion itself.

Totally missed that optocoupler. Then it makes sense. It's then not suitable for my use case. Back to drawing board