I have an application where everything on my board runs 3.3V and I'd like to power the assembly with a 3.7V LiPo. It is my understanding that these batteries can range from 4.2V to below 3.3V
I plan on incorporating this charging board:
and taking power from the two +/- battery terminals on that board. So essentially with the USB connected I'll have 5V unregulated and battery alone anywhere from 4.2 to ~3V
I've been searching around the forums / net for an inexpensive or common solution to providing constant 3.3V. There have been a lot of numbers thrown around, certain chips and what not, but some of them are very expensive ($10 +). I've also seen suggestions for step up / step down regulators like this one from Pololu:
I don't mind the Pololu board, but if there is a simple circuit to do this that I can add to my custom PCB (not surface mount) I would prefer that.
Any advice would be great! Also, I'm a mechanical engineer, not electrical so please be gentle :wink: