Is it possible to "stack" the outputs of 2 or more buck converters?
Usually: no.
Buck converters are usually not isolated, i.e. the output shares a potential with the input. Most often, that's ground. Therefore, &quot;stacking&quot; would just short the output of the lower one to ground.
&quot;Stacking&quot; on the input simply makes no sense, these are not resistors that share the voltage drop. So that can't work out at all.
You could also build an isolated converter using the same or a different IC, but you'll need to come up with a rather complex method of feedback from the secondary side if you want competing, stacked regulation to still be good. Can't think of a case where that complexity would make sense more than you building a regulator meant for 96 V.