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LM78 output tied to 5V

Hello,

 

What happens when you tie the output of the LM78M05CT to 5V (worst case, 3.6V Avg) while you let the input float. We are trying to use a seperate power supply to enable a low power mode and want to be sure that we aren't going to damage the LM78 or that it won't sink too much current when we do this. Thanks!