Does anyone have a source on a more powerful version of the device below?
I'd like to see 1A output.  I need to drive an 11.9V string of LEDs
from a battery that will run between 13+ to 7.6V.

This converter is nice, and you CAN return the leds to the input high
side, so that you can run an LED string that's lower voltage than the
input, but the ouptut power is just not enough for my app.  I do need
something kind of small, keeping it about the same size would be good.

http://www.leddynamics.com/LuxDrive/boostpuck.php
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