Patent ID: 8416591

Claim:
A DC-DC converter, comprising: a soft start circuit; a pulse width modulation (PWM) comparator circuit; a reference voltage circuit; an error amplifier; a triangular wave generator circuit; a buffer circuit; and a NOR circuit, wherein the soft start circuit comprises: a bias circuit; a first switch circuit; a second switch circuit; a first capacitor; a second capacitor, and a second comparator, the bias circuit connected to the first switch circuit, the first switch circuit having an output connected to the first capacitor and the second switch circuit, the second switch circuit having an output connected to the second capacitor, the first switch circuit supplied with a first CLOCK signal, the second switch circuit supplied with a second CLOCK signal, wherein the second comparator is supplied with an output of the soft start circuit at an inverting input terminal thereof, and supplied with a sense voltage at a non-inverting input terminal thereof, and has an output connected to one input of the NOR circuit, and the PWM comparator circuit has an output connected to another input of the NOR circuit.