Hi All,

   I need a quick and dirty way to power an LED backlight that has 
typical specs of 16.5V and 40mA.  My source is a LiPo battery that can 
be anywhere from 2.8 (discharged) to 4.2V (being charged) out.  Ideally, 
I'd like to find a demo board (that I can get in house in a couple of 
days) that I can wire into my existing design for prototyping and 
presentation to a customer, and then adapt the demo design into the 
artwork after it's proven.  (90% efficiency would be great, but not a 
must).  I'd love to have a Microchip solution, but even they use a 
MIC2289 (Micrel) part on their LCD demo board to do this.  I'd like to 
have a regulated current supply, but there is the possibility of 
outputting 18V or more from this switcher to a current regulator that I 
already have populated on the existing design - just decreases my 
overall efficiency that much more.  This one has an adjustable output 
which is nice, but is kind of pricey at $50 each (I need 5 pieces - look 
at the bom - it's probably a 95% margin over materials) and only around 
86% efficient at my point of interest :

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=LM2703EV-ND

Thanks,

Tony

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