Implementation of an Integrated LC Component for the Output Filter of a Step-Down DC-DC Converter

The implementation of a fabricated integrated LC component for output filter of a low-power step-down DC-DC converter is presented in this paper. The topology of the LC filter has both inductor and capacitor stacked together in planar structure to form an integrated hybrid LC component. Flexible ferrite sheets are used for inductor magnetic core and capacitor dielectric substrate since ferrite materials combine both magnetic and dielectric properties. The use of these types of ferrite allows new filter topology to be investigated and also simplifies manufacturing process. The active part and the passive integrated LC output filter achieve a maximum power efficiency of 68% for output power of 1.2 W. Experimental results of the functioning of the converter are presented and discussed.