When selecting the inductor, consider three key parameters: inductor current ripple ratio (RR), falling slope of the inductor current, and RHP zero frequency (f_RHP).

The inductor current ripple ratio is selected to have a balance between core loss and copper loss. The falling slope of the inductor current must be low enough to prevent subharmonic oscillation at high duty cycle (additional R_SL resistor is required if not). Higher f_RHP (equal to lower inductance) allows a higher crossover frequency and is always preferred when using a small value output capacitor.

The inductance value can be selected to set the inductor current ripple between 30% and 70% of the average inductor current as a good compromise between RR, F_RHP, and inductor falling slope.