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TPS25730: TPS2573

Part Number: TPS25730

Tool/software:

My system is powered only from an USB Type-C port (there is no battery !!!) 5V/3A.

As I need more power I want using the controller TPS25730 that can negotiates with USB PD device to sink up to 20V/5A.

My question is: As I don't have a battery or external power supply where from I generate 3.3V for the input pin 38 VIN_3V3 Supply for core circuitry and I/O?

Regards