I've prototyped a design using an Arduino. The next step is to convert it to run off an ATmega328, make it portable (i.e. battery powered), and eventually onto a PCB.
Some components (e.g. HC-SR04) require 5V (i.e. not 3.3V). I've done some quick calculations and I believe the minimum current is ~5mA (328 + LCD + some large resistors) and maximum is ~70mA (+ 2x HC-SR04 + LED).
Most "battery-powered ATmega328" threads and guides I've read mention the 7805, but I'm aware it's an old chip and requires at least 7V input for 5V output. This could work if using a 9V battery, but if I was to use AAs I'd need five of them - but I'd prefer AAs.
If I want to use AA batteries (ideally 2 or 3, so peaking at 3 or 4.5V), which (step-up) voltage regulators are recommended?
The ones I've come across so far are LTC3525, MT3608, and U1V10F5, but even looking at the datasheets, I can't understand why I'd pick one over the other, or even if they'd all work for my solution.
Any advice appreciated