In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

What you have to watch is the regulator will be very hot when the voltage get higher because it must disapate the excess voltage as heat.

For exaple let's say you are using 500mA (0.5Amps) and using 9V at the input. That would be (9-5)*0.5 in heat or 2 watts. 

If you were using 30 volts at the input it would be (30-5)*0.5 or 12.5 watts in heat (very hot). Surely the regulator would shut down after a short time due to over heating.

Long story short...It depends on how much current you are using.

Bean.

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