Patent ID: 7750617

Claim:
A switching regulator operable to turn on and off an output transistor to drive one end of an energy storage element and thereby produce a desired output voltage from an input voltage, the switching regulator comprising: a sense resistor for generating a sense voltage commensurate with a switch current flowing through the output transistor; a sense current generating section for generating a sense current commensurate with the sense voltage; a slope current generating section for generating a slope current with a ramped or triangular waveform; a slope voltage generating section for generating a slope voltage commensurate with a summed current of the sense current and the slope current; an error voltage generating section for generating an error voltage by amplifying a difference between a feedback voltage commensurate with the output voltage and a predetermined target set voltage; a PWM signal generating section for comparing the error voltage with the slope voltage to generate a PWM signal; and a switching control section for turning on and off the output transistor based on the PWM signal, wherein the sense current generating section comprises: a first resistor through which a current commensurate with the sense voltage is passed; and a first current mirror circuit for generating the sense current by mirroring the current flowing through the first resistor.