The minimum inductor size can be estimated using Equation 35.
The worst case peak-to-peak ripple current occurs at 50% duty cycle (VIN = 12.25 V) and is estimated as 1.02 A. Worst case RMS current through the inductor is approximated by Equation 38.
The worst case RMS inductor current is 6.13 Arms. The peak inductor current is estimated by Equation 39.
A 10-μH inductor with a minimum RMS current rating of 6.13 A and minimum saturation current rating of 6.57 A must be selected. A TDK RLF12560T-100M-7R5 7.5-A 10-μH inductor is selected.
This inductor power dissipation is estimated by Equation 40.
The TDK RLF12560T-100M-7R5 12.4-mΩ DCR dissipates 466-mW of power.