Low dropout linear voltage regulator and direct-current regulated power supply

Abstract

The invention discloses a low dropout linear voltage regulator and a regulated power supply. The voltage regulator comprises a voltage input end, an error amplification unit, an access unit, a feedback unit and a voltage output end, wherein a first input end of the error amplification unit is used for receiving a first reference voltage, and a second input end of the error amplification unit is used for receiving a first feedback voltage changing along with an output voltage and amplifying a voltage error between the first input end and the second input end to output a driving signal; a firstconnecting end of the access unit is connected with a voltage input end, a second connecting end is connected with a voltage output end, and a control end is connected with the output end of the erroramplification unit to adjust a voltage difference between an input voltage and an output voltage according to a driving signal; and the feedback unit is used for providing a second feedback voltage changing along with the output voltage for the first input end of the error amplification unit, and change trends of the first feedback voltage and the second feedback voltage along with the output voltage are opposite to each other. In this way, a transient response speed can be increased.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a low-dropout linear voltage regulator and a DC stabilized voltage power supply. Background technique [0002] Since the low dropout linear regulator (LDO, Low Dropout Regulator) has the characteristics of good output voltage ripple, good power supply rejection ratio and low noise, it can provide a stable output voltage, so RF circuits generally use LDO for power supply , are widely used in various portable electronic products. [0003] The inventors of the present invention found in the long-term research and development that the low dropout linear voltage regulator is used to provide a stable voltage source for the power supply terminal of the chip, but because the input terminal of the low dropout linear voltage regulator will produce current changes, the low dropout linear voltage regulator The output of the voltage transformer produces voltage transient response...

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Problems solved by technology

[0003] The inventors of the present invention found in the long-term research and development that the low dropout linear voltage regulator is used to provide a stable voltage source for the power supply terminal of the chip, but because the input terminal of the low dropout linear voltage regulator will produce current changes, the low dropout linear voltage regulator The output of the transformer produces voltage transient response changes, and the transient response time is long, so it is impossible to quickly obtain a stable output voltage

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