Small (<10mm) 200 - 500 mA driver for AAA light?

[Hill]

Anyone know of a source to get a <10mm diameter driver for an AAA light I am modding? Everything seems to be 14mm+ in diameter. Search the forum and came up empty.

I am using an XP-G and am flexible with battery options (Li-on, NimH, or alkaline. I would like a single mode buck/boost/linear driver capable of anywhere between 200 - 500 mA. Only other option is to DD with a resistor.

thanks!

 

[deadrx7conv]

Microbuck cube?

Dealextreme sku 7881?

Shrinking the diameter will just make the driver longer as you stack instead of laying out the components.

 

[Hill]

thanks, looks good, but it is out of stock and looking at the comments, it is hard to get.

 

[darkzero]

You could use a Mini FLuPIC which are still available. They are 10.5mm in diameter & will give 400ma on high. 3 level with user setting & memory, same driver used in the Draco. Would need to run on a li-ion though.

 

[Hill]

Will,

thanks very much. I knew about the regular sized flupic boards, but did not know they had a mini version. Looks like it just may work and the price isn't bad either considering I usually fry boards on the first attempt.

 

[HarryN]

If I were doing a low power 3xAAA light in that size, I would just use a resistor. The losses are going to be more or less the same as that board and the resistor is a lot more reliable than anything more complex.

 

[Hill]

If I were doing a low power 3xAAA light in that size, I would just use a resistor. The losses are going to be more or less the same as that board and the resistor is a lot more reliable than anything more complex.

Harry,

Thanks - I'm looking into that as well. I've never used the simple resistor route - either gone DD or driver. The lower Vf of XPG's however are severely overdriven by DD from 1 x li-on. Not a huge problem if heatsinking is adequate, but my build will be a single AAA light, so not much space for a sizable heatsink.