I am building a simple buck converter to regulate a 5V form my 9.6V battery. The battery is a pack of 3 18650 cells (3S) and the output is supposed to power my MCU (PIC) a couple of sensors and a servo motor.
Initially I thought I could get away with a simple Linear regulator like 7805, but the efficiency of these devices are very bad. Also, since I am running on battries I hae limited juice and have to use a switched power supply like a Buck Converter. I went though the basics of the converter and now I am stuck at a place where I have to decide the value of the inductor for my circuit which is shown below
So far I have decided to use the IRFZ44N MOSFET as a switch and the controller will be an Arduino so make things easy for my first run. Can some one please explain me how to calculate the value Inductor? A direct formulae will be more helpful.