Thanks for the reply!
I was reading the datasheet and there is a graph about Iq and load. If i read it correctly i see that under 5mA load it shuts down and uses only uA:s and switches off at about 16mA load? What happens between it?
I actually looked om the datasheet of pro minis regulator. Its a micrel 5219. Just wondering why not to use it?
If im right it takes about 350uA when load is 50mA and 80uA if load is 100uA. so if arduino could sleep using only 100uA then it would use only 180uA when idling.
And would it be ok to place a diode before the regulator to act as a reverse polarity protection?