Power supply unit, semiconductor device, and wireless communication device

Abstract

The present invention realizes stabler output voltage variable control in a power supply unit. A power supply unit capable of changing dynamic output voltage has: a first regulator for dropping down voltage by a switching method and outputting the resultant voltage to a first node; and a second regulator for dropping down the input voltage by a voltage drop and outputting the resultant voltage to the first node. In the case where a target voltage instructed by first information is larger than a predetermined threshold voltage, the power supply unit controls so that the voltage of the first node becomes the target voltage and stops supply of voltage from the second regulator. In the case where the target voltage is smaller than the predetermined threshold voltage, the power supply unit controls the second regulator so that the voltage of the first node becomes the target voltage and stops output of voltage from the first regulator.

Dependencies are inferred from the claim text.