Patent ID: 7221129
Filing Date: 2007-05-22
Classification: H02M

Abstract:
1. A switching regulator comprising: two switching elements each configured to perform a switching operation in accordance with a control signal input therein to control output of an output voltage, one of the two switching elements being larger in ON-resistance and smaller in control electrode capacitance than the other of the two switching elements; and a control switching part configured to perform pulse-frequency-modulation control over the one of the two switching elements to output a first predetermined voltage in a first operation mode, to perform pulse-width-modulation control over the two switching elements to output a second predetermined voltage higher than the first predetermined voltage in a second operation mode, and to switch the first operation mode to the second operation mode by performing the pulse-frequency-modulation control, increasing the output voltage from the first predetermined voltage to the second predetermined voltage, and switching the pulse-frequency-modulation control to the pulse-width-modulation control upon elapse of a first predetermined time after start of increase in the output voltage.