Patent ID: 9182770
Filing Date: 2015-11-10
Classification: G05F

Abstract:
1. A voltage regulator, comprising: a first input for a first input voltage; a second input for a second input voltage lower than the first input voltage; an output for an output voltage; an output transistor stage having a first terminal coupled to a first one of the first and second inputs, a second terminal coupled to the output, and a control terminal for controlling the conductivity of the output transistor stage between the first terminal and the second terminal; a feedback network coupled to the output and a second one of the first and second inputs, being different from the first one of the first and second inputs, and arranged to produce at a feedback node a feedback voltage dependent on the output voltage; a first current path for conveying a first current and a second current path for conveying a second current; a primary current mirror stage coupled to the first current path and to the second current path and arranged to control the second current dependent on the first current; a first voltage-to-current converter coupled to the first current path and arranged to control the first current dependent on one of the feedback voltage and a reference voltage, and a second voltage-to-current converter coupled to the second current path and arranged to control the second current dependent on the other of the feedback voltage and the reference voltage, wherein the voltage-to-current conversion provided by the first voltage-to-current converter is independent of the voltage-to-current conversion provided by the second voltage-to-current converter; wherein the control terminal is coupled to the second current path for controlling the conductivity of the output transistor stage dependent on a voltage in the second current path indicative of a deviation of the second current from a target current value dependent on the reference voltage for thereby reducing a deviation of the output voltage from a target voltage value.