The SP6641B from MaxLinear is a DC to DC Converter with Input Voltage 0.9 to 4.5 V, Output Voltage 1 3.3 to 5 V, Output Current 1 0.5 A, Operating Temperature -40 to 85 Degree C, Storage Temperature -65 to 150 Degree C. Tags: Through Hole, Boost/Step Up. More details for SP6641B can be seen below.