History
This was a dual dev-board I made to evaluate the ATTINY1616 alongside a boost dc-dc converter. The devices have separate power rails, but share GND (the boost doesn’t power the MCU or anything). I was about to start a solar panel / battery project and needed a switcher that had the lowest possible Vin_min and an output at 3V3.
Microchip Attiny1616-M
> All pins broken out to header except PB3-PB5.
Rohm BU33UV7NUX
>Vin 0.6V to 4.5V (strongly recommend you don’t use it as a buck)
>Vo 3.3V Fixed
>Eff 95% (max)
>Iq 7/13μA (MODE=Low/High)
I like this project.