I'm new to using buck converters. In the past I've just used a linear voltage regulator but due to heat issues in my current project I've decided to give a buck converter a try but I'm getting really confused.
I'm trying to convert automotive voltage to 3.3 V. Automotive voltages in our typical applications can vary from around 8 V to 16 V. I'm trying to power a Onion Omega which gets really unhappy at even a small bit under 3.3 V so getting an operating voltage of around 3.35 or even up to 3.6 V would be ideal and must be able to deliver at least 500 mA, preferably 1 A to be more future proof.
I have looked at a few IC's and I started designing around a LTC3621HMS8E-3.3.
I started copying the reference design
then I realized that even though I'm using the 3.3 V version of the IC, that the reference design shows that it's for 2.5 V out. Reading on in the data sheet here: LTC3621
I've come to the conclusion that I'm really confused.
The buck converter explanations found here on SE make sense from a conceptual standpoint but I seem to have a disconnect when it comes to actually making one of these things work.
Maybe I've also simply chose an insufficient IC and something else is a better fit.
I'm not asking someone to build this whole thing for me but maybe someone can help explain these things a bit better and what I should be doing to get the correct passives hooked up to this IC.