Patent ID: 7504812
Filing Date: 2009-03-17
Classification: H02M,Y02B

Abstract:
1. A voltage switching regulator comprising: a pulsewidth modulation (PWM) controller for providing voltage regulation when said voltage switching regulator is experiencing being in a high-power mode; a pulse-frequency modulation (PFM) controller for providing voltage regulation when said voltage switching regulator is experiencing being in a low-power mode; and an error-voltage estimator for enabling switching between the low-power mode and the high-power mode while keeping the voltage switching regulator output in regulation between the desired minimum and maximum voltages, said error voltage estimator is active during said high-power mode and estimates an equilibrium voltage at the output of an error amplifier that is required during said low-power mode, the equilibrium voltage is applied as an initial condition at the output of said error amplifier when transitioning from the high-power mode to the low-power mode, wherein the transient disturbance during changeover is completely suppressed.