In summary, the SEPIC converter is a popular converter topology used in a variety of DC-DC regulators and is the designers choice in multiple commercial and consumer products, such as hand held mobile and battery operated devices. Its usefulness extends into a wide range of applications and markets. The SEPIC converter circuit, when using a single coupled inductor component instead of two discrete inductor parts, can introduce benefits in cost size as well as performance. In order to facilitate the designers selection Signal Transformer provides two families of Dual Winding SMD coupled inductors, in eight series with a combined sixty part numbers.