The principle of dcdc chip output three voltages is to use polyphase control technology. Polyphase control technology is to divide the input voltage into multiple phases, and then boost or buck the voltage respectively, and then synthesize the voltage after the boost or buck, so as to obtain the required output voltage. This can improve the efficiency of the dcdc chip and reduce the ripple. The typical application scenario of dcdc chip output of three voltages is to power digital circuits, because digital circuits require a variety of different voltages, such as 3.3V, 5V, and 12V.