Patent ID: 7196502

Claim:
A switching regulator comprising: an output terminal; a power supply; a coil connected to a terminal of the power supply; a diode connected between the coil and the output terminal; a voltage dividing circuit connected to the output terminal; a reference voltage circuit; a current source; a first MOS transistor having a gate connected to the current source and a source connected to the reference voltage dividing circuit; a second MOS transistor for controlling a soft start time period in accordance with a level of an output voltage to a soft start control terminal, the second MOS transistor having a source connected to the current source and a gate connected to the soft start control terminal; a capacitor connected to a drain of the second MOS transistor; an error amplifying circuit connected to an output of the voltage dividing circuit and a drain of the first MOS transistor; a duty control circuit connected to the error amplifying circuit; and a switching transistor having a gate connected to the duty control circuit and a source connected to the coil.