Switch Mode Regulator Diode Options

Projects General Guidance
1

In past project I have used the LM2596 switching mode regulator. My project requires at times 2A (3.3V) and this regulator seems to have been doing the job like a champ.

The diode in the attached schmatic is the 1N5825. The problem I have with this diode is that it is absolutely massive and on mouser is $42. I would like to find a replacement diode but am unsure as to what parameters really mater. I am looking at the SS34 but would be more than happy to hear of one that is small (not too small 0805 or larger (I have fat fingers :slight_smile: )) and cheap.

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2

Not worth it to make your own switching supplies.
On ebay you can find complete LM2596 boards, including diode, for ~US$1 (free shipping).
Leo..

3

Any Schottky diode that has the required current rating will work.

4

mauried:
Any Schottky diode that has the required current rating will work.

And a reverse-breakdown voltage higher than the input voltage.

5

Thanks guys that is what I needed to hear!

Wawa:
Not worth it to make your own switching supplies.
On ebay you can find complete LM2596 boards, including diode, for ~US$1 (free shipping).
Leo..

Already have one..... This is only true if you are trying to hodgepodge something together. The is a printed complete solution. Thanks for the help again.