This device uses a hysteric control method which has a variable frequency. Meaning, you can not set the switching frequency to a constant value like with other controllers. It will vary depending on the ripple of the output voltage.
That tool is only good for inductors values 0.33uH to 22uH. Depending on your application with this device, it may be out of your range.
A tool that can assist you in your design process is our EV9486A-N-00A | 3.5A Switching Current Limit, 100V Wide Input Buck Converter EV Board, You can also take a look at figure 4 in the DS of the MP9486A.
Field Applications Engineer