[Robotgroup] [OT] Regulator for White LED

[vkonradi]

I like Linear Technology for this sort of stuff.  They write good tech notes, have good development boards, and Digikey sells their ICs.  Their LTC3454 chip for instance looks like a good match for what you are doing.  And 90% efficiency for a buck-boost is not bad at all.

Linear has this brochure on driving LEDs:
http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1094,D24935

There is also a decent Maxim app note on driving LEDs:
http://www.maxim-ic.com/appnotes.cfm/appnote_number/3070

Cheers!

Vadim

----- Original Message ----
From: Paul Atkinson <pmatkinson at gmail.com>
To: The Robot Group Mailing List <robotgroup at puremagic.com>
Sent: Wednesday, April 18, 2007 12:54:29 PM
Subject: [Robotgroup] [OT] Regulator for White LED


I'm looking for ideas for regulating the current for some White LEDS. Seems
like I've seen chips from Maxim that do this in the past, but I came up
empty with a recent search.

I'd like to use 3 AA batteries and be able to run down to 0.9V which should
be do-able with a buck/boost design.

Sorry if this is too technical, but any ideas are appreciated.

Paul
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