The SK6018CD4-18 with DFN1x1-4 is a linear voltage regulator (LDO) made by Suntek. It is designed to provide precise, low-noise regulation of output voltages as low as 1.1V up to 18V with 3% accuracy. It has an ultra-low quiescent current of just 70µA, making it well suited for portable applications. The device is RoHS compliant and offers protection features including short-circuit protection, thermal protection, and current limiting. It is packaged in a 1x1-4 DFN, making it suitable for a variety of space-constrained applications.