Linear voltage regulators...

[Jay Bendon]

I have a linear voltage regulator KY5033 http://www.ti.com/lit/ds/symlink/lp2951.pdf

that is putting out 11.73v dc with an input voltage of 12.25v and i have no idea why.

any insight?

--Jay

[Kevin Fusselman]

In a word, dropout. A regulator like this can't output the same voltage it receives as input. I checked the data sheet and it indicates 380mv at 100ma (and presumably more at higher loads and/or temperature ).

As for solutions, I'm not really sure. Increase input voltage somehow?

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[Nathan Schulte]

In a better word: broken.

The KY5033 is a fixed 3.3 volt regulator in a TO-92 package (3 pin
"transistor" package).

Try another one, and wear a grounding strap.

--
Nate

[Kevin Fusselman]

Oh snap... I was looking at the multi-pin  variable one on the data sheet...

[Jay Bendon]

How do you guys protect components from ESD when you're building out on a proto board?

I hooked another one up to a 12v source and my multimeter and it was also outputting similar voltages.

Am i really killing these things?

--Jay

[Kevin Fusselman]

Linear regulators shouldn't be THAT crazy esd sensitive, should they? Where's Encyclopedia Knaack when you need him?

[Jonathan Derrick]

From experience, is it possible you misread the to-92 orientation and got it backwards the first time? You can run dmm on diode mode to get the right direction if you are unsure.

[Jay Bendon]

tested it in diode mode on my dmm and i had the correct orientation :-/

--Jay