Patent ID: 9411345
Filing Date: 2016-08-09
CPC Classification: G05F

Claim Text:
1. A voltage regulator, comprising: an error amplifier; an output transistor; an undershoot detection circuit having a reference terminal, a feedback terminal, and a control terminal, wherein the undershoot detection circuit is configured to detect a voltage at the feedback terminal that is based on an output voltage of the voltage regulator, and output, via the control terminal, a current corresponding to an undershoot amount of the output voltage, wherein, in accordance with the current, a current flowing through the output transistor is increased; and an I-V converter circuit that comprises a first transistor controlled by the output of the error amplifier and a second transistor connected to the first transistor, wherein the second transistor forms a current mirror circuit with the output transistor, and a terminal of the second transistor is connected to the control terminal of the undershoot detection circuit, wherein the I-V converter circuit is configured to generate a current proportional to both an output voltage of the error amplifier and a current flowing from the control terminal of the undershoot detection circuit for controlling the output transistor to output a regulated voltage.