The 5S9.110SMT from Calex Manufacturing is a DC to DC Converter with Input Voltage 4.5 to 5.5 V, Output Voltage 1 9 V, Output Current 1 0.11 A, Output Power 1 W, Isolation Voltage 1 kV. Tags: Surface Mount, Boost/Step Up. More details for 5S9.110SMT can be seen below.