The TS19371CX6 from TSMC is a LED Driver IC with Input Voltage 2.5 to 18 V, Number of Channel 1, Number of Output 1, Switching Frequency 800 to 1600 KHz, Operating Temperature Range -40 to 85 Degree C. Tags: Surface Mount, DC-DC LED Driver. More details for TS19371CX6 can be seen below.