Power management integrated circuits (power management ICs or PMICs) are integrated circuits that perform different functions related to power management. They may have one or more functions including DC to DC conversion, battery charging, power-source selection, voltage scaling, power sequencing, and miscellaneous functions. PMICs control the flow and direction of electrical power. Electrical devices contain internal voltages and sources of external power. PMICs usually incorporate multiple functions into one IC to increase efficiency, decrease size, and create better heat dissipation.