I have created a board that contains a ESP 32 microprocessor that requires 3.3v DC. I also have a device on the same board that requires 12v DC, As I have it right now, there are two power terminals, one for 3.3v and one for 12v. I’d like to put some sort of circuit on this board so I can power the whole thing with a single 12v connection. In other words, I need a circuit that will drop the 12v down to 3.3v. The 3.3v needs only 250ma of power but it should be pretty clean.
Perhaps 811-2921-5-ND would be a better option, since it is in stock ready to ship, where 3986-S12HIS3.3-1WA2-ND is a marketplace product with a 30 day estimated lead time. This one also has a datasheet found here.
Regarding input fusing, below is a snippet from the datasheet:
At first glance, you just might be right. I’m going to look over the docs Ryan mentioned and make my decision. I won’t have a chance to do this until this weekend. So, I’m not ignoring you both. I will let you know what happens.
You may want to first test one of the above mentioned 3.3V switching regulators with some good capacitors, such as the A750EK476M1EAAE040 or the A768EB476M1ELAE042 aluminum polymer capacitors and see if the ripple is low enough without a linear regulator.