The PT4115EE89E is a highly efficient, step-down LED driver, made by CR-PowTech. It is designed to drive LEDs up to 30V from a single cell Li-ion battery. It contains a DC-DC converter, inductor, and two MOSFET power switches. It features ultra-low quiescent current and high efficiency, as well as an adjustable output current. It is packaged in a SOT-89-5 package that complies with RoHS standards, thus reducing environmental impact due to its lead-free construction.