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How to make a 1-1.5 volt voltage regulator at 15 amps? Answered

Hi, I want to make a high current (15 or 16 amp) voltage regulator that outputs around 1 to 1.5 volts. Does anyone know how this could be done cheaply and easily?
I've looked at the 15 amp schematic in the LM338 datasheet (http://www.ti.com/lit/ds/symlink/lm138.pdf  page 11), which uses 3 LM338s in parallel, but I'm pretty sure that takes the minimum output voltage to about 4v, way too much for me.

I've looked at using 2n3055 transistor, but it seems like I'd need ridiculous heatsinking and probably fans to avoid thermalling out. I'm thinking of taking my power from an old PSU, 5 v rails, so not too much of a voltage drop, but it's hard to find stuff that can handle these kind of currents.

I'm pretty much stumped right now, anyone got any ideas?

3 Replies

mpilchfamily (author)2012-02-22

I found this with a bit of a google search. It takes 1.5V to 5V in and outputs .8V to 5V at 15A.

This one is from the same family but uses a higher input voltage to give you the same output range.

Then i Found this. At $50 its not cheap but it will get the job done.

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lemonie (author)2012-02-26

I'd like to know what this is to be supplying power to.


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lolkent (author)2012-02-23

Thanks mate, you're a legend...

Checked on mouser for that $50 dollar part, found this for only 6 bucks, meets all my specs, think I'll be using that!


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