The preceding chapter proposed the switched-capacitor converter (SCC) as a solution for fully integrating a high-voltage converter in the milliwatt power range. Before exploring SCCs at 400 V DC input voltage, this chapter delves into the fundamentals of fully integrated switched-capacitor DC-DC converters. Initially, it elucidates the operational principle underlying an SCC. This is followed by an analysis encompassing the equivalent model of the SCC and its losses, while also examining the trade-off in relation to power density. Concluding the chapter, control strategies are examined to manage load and line variations.