Patent ID: 8624566

Claim:
A current-mode control switching regulator that steps down an input voltage input to an input terminal to a predetermined constant voltage and outputs the stepped input voltage from an output terminal as an output voltage, the current-mode control switching regulator comprising: a switching element that performs a switching operation in accordance with an input control signal; an inductor that is charged with the input voltage by the switching operation of the switching element; a rectifying element that discharges the inductor; an error amplification circuit unit that amplifies a voltage difference between a divided voltage obtained by dividing the output voltage at a predetermined ratio and a predetermined reference voltage; an oscillation circuit unit with variable oscillation frequency that generates and outputs a clock signal having a set oscillation frequency; a slope voltage generation circuit unit that generates and outputs a slope voltage having an inclination corresponding to the input voltage and the oscillation frequency; and a switching control circuit unit that compares an output voltage from the error amplification circuit unit with the slope voltage, generates a pulse signal of a duty cycle corresponding to a comparison result using the clock signal, and performs switching control on the switching element in accordance with the pulse signal.