So i am designing a device that is supposed to connect to the PC via USB and draw power from the VBUS (+5v) of the USB.
I am wondering if I need to put a voltage regulator in between the +5v from the USB and the microcontroller on my device. I've tested this device on my own laptop and it works fine. But I'm not sure if I can make any assumption regarding the stability of the VBUS on other computers. I looked at some Arduino designs and they don't seem to place any voltage regulator when it is powered through the USB.
So is it safe to assume that the +5v coming from a PC USB connection is fairly stable?