1 x AA 1.5volt powers 12 white LEDs. HOW?

riksilvers · Oct 19, 2005

I've seen the torches with 12 white LEDs and only powered by 1 x AA 1.5 volt battery. I know they use a dc-dc circuit but what? Is it just an IC? How is it done? I'm a bit new to this so any help would be great..

lamperich · Oct 19, 2005

it´s something like that here...
http://www.linear.com/pc/productDetail.do?navId=H0,C1,C1003,C1094,P10995

riksilvers · Oct 20, 2005

Thanks very much
What would be the max number of white LEDs that this would run ?

lamperich · Oct 20, 2005

riksilvers said:
Thanks very much
What would be the max number of white LEDs that this would run ?

i this was only a example.
Don´t know if this IC can handle multiple Leds or not...

legtu · Oct 20, 2005

Try this link and click on view table.

On a side note, the LTC3490 can drive upto 17 parallel white LEDs @~20ma.

riksilvers · Oct 20, 2005

The LTC3215 has a too higher Vin (2.9v). You could get away with 2 x AA's. The LTC3490 looks good if it does drive 17 white LEDs. I guess 17 would be quite dim at 20ma so there must be a compromise somewhere. cheers

1 x AA 1.5volt powers 12 white LEDs. HOW?

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