Power management refers to how to distribute power to different components of the system effectively. Power management is essential for mobile devices that rely on battery power. A power management integrated circuit, a power management IC or PMIC as a unit, is an integrated circuit used for power management. Although PMICs contain various chips, most of them also contain DC/DC converters or other control parts. Power management ICs are usually included in battery-powered devices to reduce the space required. The power management IC is a solid-state device that can control the flow and direction of the power supply. By reducing energy consumption when components are idle, an excellent power management system can extend battery life by two or three times. Power management technology is also called power control technology. It belongs to the category of power electronics technology. It is an edge cross-technology that integrates power conversion, modern electronics, network construction, and automatic control.