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Project Notes

#153 AMS1117 Regulator

Test an AMS1117 3.3V linear regulator

The Build

Notes

The AMD1117 is a low drop fixed and adjustable voltage regulator from Advanced Monolithic Systems (AMS). It is similar to “1117” regulators available from a number of manufacturers including UTC and ST. Parts are available for a range of output voltages, including: 1.5V, 1.8V, 2.5V, 2.85V, 3.3V, and 5.0V.

The component I have (obtained from a seller on aliexpress) is marked: AMS1117-3.3 H1518 in a SOT-223 package.

As given in the datasheet:

  • dropout voltage (Vin - Vout): 1.1V typical, 1.3V max
  • Vin max: 15V
  • current limit: 1.1A typical, 1.5A max
  • pin out (from left front): ground, Vout, Vin

Circuit recommendations:

  • 22µF tantalum output capacitor

Some DMM measurements, with a 10kΩ output load:

Vin Iin Vout Iout Pin:Pout
5.09V 2.68mA 3.29V 333µA 13.64mW : 1.1mW

The inefficiency of a linear regulator is clear to see - we’re dissipating 12.74mW in the 1117, far more power than is actually delivered to the load. But they’re convenient!

Construction

NB: these diagrams use the custom AMS1117 module fritzing part

Breadboard

The Schematic

Credits and References

About LEAP#153 Power
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This page is a web-friendly rendering of my project notes shared in the LEAP GitHub repository.

LEAP is my personal collection of electronics projects, usually involving an Arduino or other microprocessor in one way or another. Some are full-blown projects, while many are trivial breadboard experiments, intended to learn and explore something interesting (IMHO!).

The projects are usually inspired by things found wild on the net, or ideas from the sources such as:

Feel free to borrow liberally, and if you spot any issues do let me know. See the individual projects for credits where due. There are even now a few projects contributed by others - send your own over in a pull request if you would also like to add to this collection.