Patent ID: 8581567

Claim:
A switching regulator for converting an input voltage input to an input terminal into a predetermined constant voltage and outputting the predetermined constant voltage as an output voltage from an output terminal, the switching regulator comprising: a first switch element configured to perform a first switching operation so as to be turned on/off according to a first control signal that has been input; an inductor configured to be charged by the input voltage according to the first switching operation of the first switch element; a rectification element configured to discharge the inductor in the event that the first switch element is turned off and the inductor stops being charged; an error amplifying circuit unit configured to amplify a voltage difference between a predetermined reference voltage and a proportional voltage that is proportional to the output voltage, and to output an amplified voltage corresponding to the amplified voltage difference; an inductor current detecting circuit unit configured to detect an inductor current flowing to the inductor, generate an inductor voltage in accordance with the detected inductor current, and output the generated inductor voltage; a slope voltage generating circuit unit configured to generate and output a slope voltage having a slope that is specified in advance; and a switching control circuit unit configured to add the slope voltage to the inductor voltage output from the inductor current detecting circuit unit to obtain an added voltage, compare the added voltage with the amplified voltage output from the error amplifying circuit unit to obtain a comparison result, generate a pulse signal of a duty cycle corresponding to the comparison result, and control the first switching operation of the first switch element according to the pulse signal, wherein: the slope voltage generating circuit unit generates and outputs the slope voltage having the slope that is inversely proportional to a slope of the inductor current detected while the first switch is turned off and in a cutoff status.