I'm trying to power a Attiny2313A from 4V (which achieves the Voltage/Amperage ratio I want) but the power source I have to get 4V from, is 16V. So I'm wondering what some recommendations would be.
I have tried to do a voltage divider with ratio 0.25 (R1= 2k & R2= 6k) and this can power the device, but the current being used by the resistors clearly shows limitations and the output of the Attiny2313A isn't dependable.
I have also tried a buck converter I bought off eBay, which draws 5.5 mA without even connecting to Attiny2313A.
In case you wanna see the limitations from the voltage divider, here is two pictures, where the first is with a steady 4V from my Analog Discovery and the second is 4V from the voltage divider. Worth mentioning is that the signal you see is coming from the 16V and controlled by the Attiny via a transistor.
Any ideas or suggestions?