Low dropout regulator

摘要

A low dropout regulator comprises an output transistor with a controlled section between a first supply terminal and an output terminal, and a differential amplifier comprising a feedback input coupled to the output terminal, a reference input receiving a reference voltage, an output connected to a control terminal of the output transistor, and a pair of input transistors connected to a tail current source. A control terminal of a first transistor is connected to the reference input. A control terminal of a second transistor is connected to the feedback input. A first capacitive element is coupled between the output terminal and common connection of the input transistors of one pair with their tail current source. A second capacitive element is coupled between a second supply terminal and the common connection of the input transistors of one pair with their tail current source.

主权项

1. A low dropout regulator, comprising:
an output transistor with a controlled section coupled between a first supply terminal and an output terminal, and a differential amplifier that comprises:
a feedback input coupled to the output terminal;a reference input for receiving a reference voltage;an output connected to a control terminal of the output transistor; andat least one pair of input transistors; wherein
the input transistors of each pair are commonly connected to a tail current source of the respective pair,a control terminal of a respective first transistor of each pair is connected to the reference input;a control terminal of a respective second transistor of each pair is connected to the feedback input;a first capacitive element is coupled between the output terminal and the common connection of the input transistors of one pair of the at least one pair of input transistors with their respective tail current source,a second capacitive element is coupled between a second supply terminal and the common connection of the input transistors of one pair of the at least one pair of input transistors with their respective tail current source,the differential amplifier comprises a first pair of input transistors and a second pair of input transistors,the first capacitive element is coupled between the output terminal and the common connection of the input transistors of the first pair with their respective tail current source,the second capacitive element is coupled between the second supply terminal and the common connection of the input transistors of the second pair with their respective tail current source, andthe tail current source is connected between the common connection and second supply terminal.