The EN/SET logic input functions as a chip enable and a digital programming interface for setting the current in the LED channels. The 1-wire pulse-programming interface supports 15 linear steps from zero current to 30mA fullbrightness in 2mA steps. The device is available in a tiny 16-pad TQFN 3 x 3mm package with a maximum height of 0.8mm. Catalyst Semiconductor's Quad-Mode 1.33x, charge pump switching architecture is patented.