Q: The datasheet for the MAX3491EESD+ only lists a junction-to-ambient and junction-to-case resistance. Is it possible to generate a junction-to-board resistance as well?

A: Regarding the junction-to-board thermal resistance for the MAX3491EESD+:
Unfortunately, this is not a parameter that is typically provided since a junction-to-board thermal resistance ΘJB is not a thermal resistance independent of the environment. It depends on the application and printed circuit board. Testing for this parameter indicates a single, direct thermal resistance path as illustrated in this technical article: