Switching power supply circuit and switching power supply device

A switching power supply circuit used in a switching power supply device configured to generate an output voltage by switching an input voltage, comprising:

• a switching circuit configured to switch the input voltage by a switching operation;
• a first amplifier configured to generate, on a first wiring, a first voltage corresponding to a first difference between a feedback voltage corresponding to the output voltage and a reference voltage;
• a first phase compensation circuit including a first capacitor provided in series between the first wiring and a fixed potential point and configured to compensate for a phase of the first voltage;
• a second amplifier configured to generate, on a second wiring, a second voltage corresponding to a second difference between a voltage corresponding to a current flowing through the switching circuit and the first voltage;
• a second phase compensation circuit including a second capacitor provided in series between the second wiring and the fixed potential point and configured to compensate for a phase of the second voltage;
• and
• a drive control circuit configured to be capable of executing the switching operation according to the second voltage,
• wherein the switching power supply circuit is configured to operate in a first mode or a second mode according to the feedback voltage,
• wherein the drive control circuit is configured to, in the first mode, perform the switching operation while driving the first amplifier and the second amplifier, and in the second mode, stop the switching operation by stopping driving the first amplifier and the second amplifier, and
• wherein when returning from the second mode to the first mode, a specific voltage corresponding to the output voltage is supplied to the second capacitor and a predetermined voltage is supplied to the first capacitor.