Hello, welcome to the MPS forums!
To answer your questions directly and in order:
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Yes, Vhot and Vcold and percentages of Vin. The following images are on page 9 of the
MP2667 datasheet.
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From the datasheet, we can see that typically Vcold = 0.66x(Vin) & Vhot = 0.35x(Vin).
In this example, let us say that Vin = 5V, Vcold = 3.3V, Vhot = 1.75V
You mentioned that Rnt_Cold = 300kOhms & Rnt_Hot = 20kOhms
Now it’s just a matter of calculating Rt1 & Rt2 using equations (1) and (2):
Best,
Krishan