The 171040302 from Wurth Elektronik is a DC to DC Converter with Input Voltage 2.95 to 6 V, Output Voltage 1 0.8 to 3.6 V, Output Current 1 4 A, Output Power 14400 mW, Operating Temperature -40 to 85 Degree C. Tags: Surface Mount, Buck/Step down. More details for 171040302 can be seen below.