The LT3475 from Analog Devices is a LED Driver IC with Input Voltage 4 to 36 V, Output Current 50 to 1500 mA, Number of Output 2, Switching Frequency 200 to 2000 KHz, Operating Temperature Range -40 to 125 Degree C. Tags: Surface Mount, DC-DC LED Driver. More details for LT3475 can be seen below.