SparkFun FemtoBuck LED Driver

This is the FemtoBuck, a small-size single-output constant current LED
driver.

Each FemtoBuck has the capability to dim a single high-power channel
of LEDs from 0-350mA at up to 36V while the dimming control can be
either accessed via PWM or analog signal from 0-2.5V.

For the FemtoBuck, we've increased the voltage ratings on the parts to
allow the input voltage to cover the full 36V range of the AL8805
driver. Since the FemtoBuck is a constant current driver, the current
drawn from the supply will drop as supply voltage rises. In general,
efficiency of the FemtoBuck is around 95%, depending on the input
voltage. On board each FemtoBuck you will find two inputs for both
power input and dimming control pins and an area to install a 3.5mm
screw terminal. Finally at either side of the board you will find
small indents or "ears" which will allow you to use a zip tie to
secure the wires to the board after soldering them down.