I want to create a power supply that gives continue voltage to the Atmega328p by using a Lipo 3.7v 400/600mah~ that can also be charged by usb. While charging it should also deliver power to the Atmega328p. I searched the web for examples and i found so many (mainly buck/stepdown converters) withou…

Buck converter 3.3v (from usb 5v., 3.7v lipo)

couka November 1, 2017, 2:52pm 3

Why do you need 3.3V? The ATmega will run @8MHz fine between 2.7V-5.5V.

For charging and protecting the Li-Ion: There are cheap protection ICs or modules on eBay

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