DC/DC converter is a switching power supply chip, which refers to the action of high-frequency switching through controllable switches (MOSFET, etc.) by using the energy storage characteristics of capacitors and inductors, and stores the input electric energy in the capacitors (inductors). When the switches are turned off, the electric energy is released to the load to provide energy. Its output power or voltage capacity is related to the duty ratio (the ratio of the on-time of the switch to the period of the whole switch). Switching power supply can be used for boosting and reducing voltage.