I am trying to design the power hierarchy if you will for a PCB that I'm designing. My choice in battery is flexible but at the moment I have a 3.7V source. I have two main power rails, 3.3V and 5V and I am having trouble picking the correct solution for my project. At first I had:
I heard that chaining these regulators together reduces the efficiency, so I changed my hierarchy to
3.7V battery -> MCP1826 (3.3V LDO)
3.7V battery -> TLV61220 (5V Boost)
I am relatively new to PCB design, I've only done 3 boards so far and I am trying to learn best practice for conditioning the power inputs to my board. Efficiency is key, as my battery powered device needs to last as long as possible.
Is an LDO the right choice here? Its dropout voltage is 400mV so I believe it should be fine to output 3.3V. Should I consider changing my battery voltage? Is there a standard when it comes to powering a 3.3V board?
Also, if anyone has any resources whether they be links, books, PDFs etc about choosing the correct solution to condition the power inputs to a PCB that would be much appreciated.
Edit: After posting, and thinking about possible ambiguities, my system should never draw more than 500mA at a time, it will likely remain around 200mA when active, and a few hundred uA when sleeping, depending on the quiescent draw of my regulators.