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Does a voltage regulator exist that gives me 5 Volts when provided 6 Volts? The standard LM7805 I have have a voltage drop of 2 volts so I would at least need 7 volts supply. Are there some with a drop of 1 volt or below?
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
Yes, there are many, see here as an example:
The drop depends on different factors like current and temperature. If you only need a limited current at a given temperature a 2 V drop worst case regulator may work fine. It should be specified in the datasheet.
Thank you for the quick answer. The current needed will be quite low (AVR microcontroller). Plus a few LEDs. In the datasheet it says voltage drop of 2 volts at 1 amp, so at about 100mA it might work?!
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
That is possible, exactly how much lower the drop will be at 100 mA depends on the design of the regulator. My guess is that it will still be a bit higher than 1 V.
If the design is not critical you might not need a regulator at all, run it at 6 V or one or two diodes in series can be all you need.
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Voltage regulator 6 to 5 Volts
