Hello! The following schematic has a 3.3V switching buck/boost converter and a LiPo charger IC. I would like to make it so that when it is not plugged into a 5V usb power source the circuit will run off of the battery, but when it is plugged into the USB it will charge the battery and power the circuit from the 5V USB source. Will the diode D1 be sufficient to make this happen?
1 by jg1996business, on Flickr
1 by jg1996business, on Flickr