In the near past technology progress enabled electronic circuits to become smaller and denser. Moreover, scaling down of Integrated Circuits (ICs) fabrication processes allowed for the reduction of the supply voltage and techniques for diminishing power consumption were developed. As a consequence the use of battery-powered portable devices has grown rapidly and power electronics had to expand its coverage to permit their realization. Compact, cheap and efficient monolithycally integrated converters are of paramount importance for portability and performances need to be improved continuously, with growing challenges and problems. Smartphones, laptops, remote sensors and controllers are just few examples of applications made possible by integration and technology progress.