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Author Topic: Looking for an LED driver  (Read 414 times)
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I'm looking for a constant current (preferably adjustable) LED driver that can run off of a single AA battery (0.8 to 1.6v input) and light up 1 white LED (3.3v Vf). Does such a chip exist? I'm new to LED drivers so I'm not even sure how to search for it. Alternatively I could just use a 5v step-up converter and a resistor, but that burns away some power. If you can find one with 2 outputs that would be even better. I'll be ordering on Digikey.
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Valencia, Spain
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Google for "joule thief"...

Ok, it's not current regulated, but with only one battery you need some sort of booster before you can do anything much.
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Ha, I hadn't thought of using a joule thief actually, I remember making one of those a few years ago. But I was hoping there's an LED driver with a boost converter built in. I did find a few chips, but the output current decreased as input voltage decreased. A joule thief might be the way to go. I'm waiting for my first oscilloscope to arrive, so tuning shouldn't be a problem.
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