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

Another reason for the conservative ratings is that we don't know what type of power supply is being used.  Many are unregulated, and that can mean that their output is significantly higher than it's rated output when not near or at it's current rating.  So if you'll be using 16V, you should check to make sure that it doesn't go too much higher.  Remember, whatever the input voltage is, depending on the current, the regulator will have to dissapate the remaining energy as heat.  So the higher the input voltage, the more heat generated at the same current draw.

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