What is "Supply Input for Analog Functions" on a buck converter?
What is this "out" connection arrow used for in practice?


It's on the first page: "The AOZ2253EQI-30 integrates an internal linear
regulator to generate 5.3V VCC from input."

It means that they make some regulated power available with all the advantages and disadvantages of a LDO linear regulator.

I can't speak for anyone else, but if I used it at all, it would be for some low current consumption circuit that needed to come up before the switching regulator did.


  Is that a viable way to connect this converter if I dont have a use for whatever that "out" arrow is for?


It's certainly what they call out.  You do need the cap, according to the datasheet -- LDO regulators, particularly those of a certain vintage, tend to need them.