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Topic: Protecting Voltage Regulator (Read 1 time) previous topic - next topic

AlxDroidDev

Put a Schottky diode in the output pin, like it's been said, so your voltage drop will be minimal.
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dhenry

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Can it get ruined?


It depends on the regulator. 1117's for example don't like that much. What you should do is to put a diode from the regulator's output pin to its input pin. Any diode will do.

Grumpy_Mike

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1117's for example don't like that much.

True but the OP was talking about an 7805.

Bajdi

Interesting conversation, I regularly power my self made boards through the 5V pin bypassing the regulator. I mostly use LM2940's, I have not had any problems so far. Can I ruin the LM2940 that way?

dhenry

Very unlikely. In general, the ldos tend to have issues with that, and 1117 is probably an extreme example: it gets hot very quickly if powered reversely.

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