LTM4650A EXTVCC

Dears.

I have two inquiries regarding LTM4650A.

Q1.
How should the EXTVCC of the LTM4650A be designed under the following conditions?

Case#1
VIN 12V, Vout 3.8V

Case#2
VIN 5V, Vout 3.8V

Q2.
In the schematic, SGND and GND are connected.
However, in DC2603A-A - Design Files's, Pin-C7 and Pin-D6 are connected.
but C7 and D6 are not connected to F7, F6, G7 and G6.

You need to check if the schematic is correct or if the DC2603A-A - Design Files's is correct.

Please check and let me know.

Thank you

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