Patent ID: 8629665
Filing Date: 2014-01-14
Classification: G05F

Abstract:
1. A voltage regulating apparatus comprising: a linear regulation unit comprising a switching regulation unit comprising a selection unit coupled to the linear and switching regulation units, receiving the first error signal and the second PWM signal, and outputting a regulating signal which is selected from one of the first error signal and the second PWM signal; a first power transistor coupled to the switching regulation unit and receiving the first PWM signal; and a second power transistor coupled to both the selection unit and the first power transistor, and receiving the regulating signal; wherein a connection point of the first and second power transistors is coupled to the second output stage; and wherein the voltage regulating apparatus can be put either in a linear mode of operation if the first error signal is selected as the regulating signal, or in a switching mode of operation if the second PWM signal is selected as the regulating signal.