The HL8021FNQ01 from Halo Microelectronics is a DC to DC Converter with Input Voltage 4.5 to 40 V, Output Voltage 1 4.5 to 40 V, Output Current 1 8 A, Operating Temperature -40 to 85 Degree C. Tags: Surface Mount, Boost/Step Up. More details for HL8021FNQ01 can be seen below.