Patent ID: 8729876
Filing Date: 2014-05-20
Classification: G05F

Abstract:
1. A voltage regulator, comprising: a first comparator, having a first end coupled to a first reference voltage and a second end coupled to a feedback voltage that is generated at a node of a resistor network, for comparing the first reference voltage with the feedback voltage to generate a first comparing result accordingly; a first transistor, having a control end for receiving the first comparing result, a first end coupled to a supply voltage, and a second end coupled to an output node of the voltage regulator, wherein the first transistor controls an output voltage at the output node in response to the first comparing result; a second transistor, having a control end for receiving a control signal, a first end coupled to the supply voltage, and a second end coupled to the output node, wherein the second transistor adjusts the output voltage at the output node in response to the control signal; a feedback block, coupled between the second end of the first comparator and the output node, for providing the feedback voltage according to the output voltage; and a control block, coupled between the control end of the second transistor and the output node, for receiving the output voltage and providing the control signal according to the output voltage, wherein when the output voltage has a voltage drop, the control block is operative to generate the control signal to control the second transistor to increase a voltage level of the output voltage for reducing the voltage drop only.