Power supply circuit

A power supply circuit according to an embodiment includes: a first transistor that is controlled to turn on and off in accordance with a control signal supplied to a gate and outputs an output voltage following a predetermined voltage; a second transistor, one end of a current path of which is connected to an input terminal for supplying a power supply voltage and the other end of which is connected to one end of a resistor, the second transistor outputting the predetermined voltage in accordance with the control signal; and an amplifier circuit that amplifies a voltage difference between a reference voltage and the predetermined voltage input via the other end of the resistor, and outputs the amplified voltage difference as the control signal. 实施方式的电源电路具有：第1晶体管，其导通、截止根据被供给到栅极的控制信号来控制，输出对预定电压进行了跟随的输出电压；第2晶体管，其电流路径的一端连接于供给电源电压的输入端子，另一端连接于电阻的一端，根据所述控制信号输出所述预定电压；以及放大器电路，其对基准电压与经由所述电阻的另一端而输入的所述预定电压的电压差进行放大，并作为所述控制信号进行输出。