Need to shut down half my pcb to save power. Didn't really want to add another 5V regualtor since I already have one and its pretty large.
I have a car battery feed (10-15V) coming in and need to knock it all down to 4.75 - 5.10V. Then being able to source upto 250mA. My plan was to use my 5V regulator and then a mosfet to turn half the board off, but I forgot that fets cause a small voltage drop that would put my at about 4.3V.
I've been looking for the best way to do this. Maybe a transistor setup or an opamp a voltage follower mode ?
I'm not opposed to buying more components as long as they are small, cheap, and will help save power. Just not sure what the best approach is,
Any ideas ???
I have a car battery feed (10-15V) coming in and need to knock it all down to 4.75 - 5.10V. Then being able to source upto 250mA. My plan was to use my 5V regulator and then a mosfet to turn half the board off, but I forgot that fets cause a small voltage drop that would put my at about 4.3V.
I've been looking for the best way to do this. Maybe a transistor setup or an opamp a voltage follower mode ?
I'm not opposed to buying more components as long as they are small, cheap, and will help save power. Just not sure what the best approach is,
Any ideas ???