I'm using this 1.2 V voltage regulator and having some serious problems.

Currently have +5 V going to EN and IN pins and GND is connected to GND, seeing ~1.6 V on OUT pin when connecting it to GND through 8k resistor.

I have been trying to figure out why the regulator is not outputting 1.2 V for days now and I am completely stumped.

Any ideas?

  • 2
    \$\begingroup\$ A schematic of your circuit and a photo of how you built it might both help us see some reason your circuit isn't behaving the way you expect. \$\endgroup\$
    – The Photon
    Nov 19, 2012 at 23:44

2 Answers 2


These devices need input and output capacitors to keep them stable. Take a look at the datasheet:

datasheet excerpt

Without local caps (as close as possible to the pins) these things can and will oscillate, which unless you're looking with a scope can appear as incorrect DC voltage levels.

Add caps and try again. If you're still not having any luck post some scope shots of the input and output voltages.

  • \$\begingroup\$ looks like it was an oscillatory problem. Output cap cleared up the issue. \$\endgroup\$
    – moesef
    Nov 20, 2012 at 0:29

Do you have an output capacitor?? The datasheet states "Furthermore, these devices are stable with an effective output capacitance of only 0.1 μF" I think that might be your issue


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