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TPS25751: PMP41083 reference design, input to VIN_3V3 pin?

Part Number: TPS25751
Other Parts Discussed in Thread: PMP41083,

Tool/software:

Greetings,

looking at the schematic of PMP41083 reference design. As far as I understand TPS25751 needs an external 3.3V supply to pin 38. Where does it come from?