Furthermore, the above described DC/DC converter may have a capability for preventing the set pulse from the oscillator 2 from being supplied to the latch circuit 5 When
an output voltage VOW becomes higher than a voltage value to be kept. This capability is implemented, for example, by the gate circuit arranged at the output of the oscillator 2, and by the circuit for generating a signal Which closes the gate circuit When the output voltage V exceeds the voltage value to be kept.