L4949 Voltage Regulator 5V

[tytower]

Anyone know how efficient they are? data sheets dont mention so thats a bad start

 

[k7elp60]

I am not sure what information you are looking for. The data sheet shows the drop out voltage the quiescent current, all effect efficiency, as well as the input output voltage.

 

[mneary]

There is no way to change the efficiency of a linear regulator, the number is obvious.

In addition to the obvious loss from ((Vin-Vout)*Iout), there is a small loss in the control circuitry. Its quiescent current is 300µA when idle, and 5mA when loaded.