The device only has to support those voltage when it can source the matching power profile (i.e. 140W). But usually if you have to be able to generate two diffe

The device only has to support those voltage when it can source the matching power profile (i.e. 140W). But usually if you have to be able to generate two different voltages, it's not much more effort to make three or ten, as long as all the components can deal with the higher voltage.