Hi guys,
I'm trying to power my Giga with 5V coming out of LMR33630 buck converter but the Vin pin only has range from 6V-24V. Do you guys know if I can route this 5V power somewhere (I know I can power it with USB from PC but I'm trying to make the PCB power the GIGA).. thx 
Why not just turn the adjustment pot up to 7 or 8 volts?
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Only power the board with external DC voltage via VIN and with a voltage that is in the specified input range of "Input voltage (VIN) 6-24V".
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This is from one of the Arduino Giga R1 WiFi Schematics, it may be possible but I am not sure what will happen to the buck converter chip. Best advice is from @Dozie , that way your warranty is still valid.
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The power tree in the datasheet suggests you should be able to provide 5v to either the USB-C or 5v rail. I would ask @Dozie to reconfirm, but agree with @gilshultz if you want to play it safe.
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I'm working on a niche complex PCB that is processed by Giga and cuz of my incompetence lol, I forgot to make the buck converter output ~7.5V, now it's too late cuz if I do so, I've to change components on all of my LDOs and I'm in layout routing stage ...
Thanks for all of your ideas guys, appreciate it
The 5V rail is OUTPUT only. Use VIN, the buck is designed for up to 22V
Just a question, i stumbled on this topic through research for another thread. (and it's still open) But doesn't the schematic show that the USB port does directly power the 5v rail through a Schottky diode ? That should mean that it is safe to use. The buck converter is only enabled when power is applied to Vin.