Plenty of chips integrate a voltage regulator so you can run digital logic from as much as 300 volts. Used in the controllers for some dimmable AC Led's for example.
I believe the linear regulator is implemented as a large resistor followed by some zener diode or something. I assume that's so the high voltage doesn't need to touch the silicon, merely the other end of some not-very-good insulator put on top.
I believe the linear regulator is implemented as a large resistor followed by some zener diode or something. I assume that's so the high voltage doesn't need to touch the silicon, merely the other end of some not-very-good insulator put on top.