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I need that an Arduino NANO clone work with 3.3V.

Can an AMS1117-5V give 3.3V if supplied with only 3.3V?

edit: current consumption is 400mA max. the AMS1117 output current is 800mA.

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closed as too broad by Dwayne Reid, laptop2d, Finbarr, RoyC, Edgar Brown Jan 10 at 22:23

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    \$\begingroup\$ What current do you need? \$\endgroup\$ – CL. Dec 29 '18 at 8:45
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    \$\begingroup\$ Have you checked what the datasheet says? We would have to look at the datasheet in order to answer this question. We also would prefer that you look yourself first, then modify your question and ask about anything that you don't understand. And, yes: output current that you need is an important part of determining the answer. \$\endgroup\$ – Dwayne Reid Dec 29 '18 at 9:47
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First issue: a 5V regulator is designed to output 5V, not 3.3V, nor any other voltage. Don't use an AMS1117-5V for any output voltage different than 5V.

Second issue: every linear regulator needs some headroom. A practical 3.3V regulator needs slightly higher input voltage. This is called the dropout voltage. Dropout voltage of the AMS1117 is around 1.1 V, so to get stable 3.3 you need to supply it with at least 4.4 V.

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