I am looking at the 7805 specs sheet and there is one chart I find missing. It is the relationship between output voltage with input voltage, specifically when input voltage is lower that 5 volts, the "nominal" output voltage.
I think it would be desirable to have 0 volts on output until 7805 can provide 5 volts, but I think this is not the real situation.
So, my question is : what voltage will 7805 deliver as output if the input voltage is 3 volts ?
Any pointer is welcome. Thanks.