Switching regulator including low-pass filter configured to have time constant for step-up operation and time constant for step-down operation

A switching regulator, comprising:

• a step-down-and-step-up unit configured to convert an input voltage to a low voltage that is lower than the input voltage, or a high voltage that is higher than the input voltage in accordance with a control signal;
• and
• a controller including a low-pass filter to receive a proportional voltage and configured to cause the step-down-and-step-up unit to perform a step-down operation or a step-up operation in accordance with a voltage difference between the proportional voltage and a predetermined reference voltage,
• the proportional voltage being proportional to an output voltage of the step-down-and-step-up unit and generated based on a ratio determined in accordance with an external control signal,
• the controller causing the step-down-and-step-up unit to perform a step-down operation or a step-up operation in accordance with a voltage difference between an output voltage of the low-pass filter and the reference voltage, and changing a time constant of the low-pass filter in accordance with the operation being performed,
• wherein the controller changes the time constant of the low-pass filter so that the time constant of the low-pass filter at a step-up operation is larger than time constant of the low-pass filter at step-down operation.