Patent ID: 7202642

Claim:
A switching regulator comprising: a power stage, the power stage comprising: a first switch; a second switch coupled to the first switch; and an output inductor coupled to the first switch and the second switch; an output capacitor coupled to the output inductor with an output voltage across the capacitor; a first reference voltage generator used for generating a first reference voltage; a first virtual ripple generator coupled to the first reference voltage generator for generating a first modulated reference voltage which reverses the output voltage according to the first reference voltage; a comparator having a first input end coupled to the output inductor and the output capacitor and a second input end coupled to the first virtual ripple generator; and a constant-time trigger coupled between an output end of the comparator and a control end of the power stage, the constant-time trigger used for controlling turning on and off the first switch and the second switch of the power stage according to a result of the comparator.