Linear voltage regulator with load detection circuit and dynamic zero compensation circuit

Abstract

The invention discloses a linear voltage regulator with a load detection circuit and a dynamic zero compensation circuit. The linear voltage regulator comprises an error amplifier, a voltage bumper, a power tube P-channel metal oxide semiconductor (PMOS), a first feedback resistance Rf1, a second feedback resistance Rf2, a load detection circuit and a dynamic zero compensation circuit, the load detection circuit is connected between an output end of the low-dropout linear voltage regulator and the voltage bumper, and the dynamic zero compensation circuit is connected between the output end of the low-dropout linear voltage regulator and the error amplifier. The load detection circuit is used for detecting the change of the load current, and then the load detection circuit controls the dynamic zero compensation circuit to produce dynamic zero zD to track and compensate a first non-dominant pole pEA of the linear voltage regulator. The dynamic compensation technology enables the low-dropout linear voltage regulator to have a better transient response performance and a smaller voltage spike for the load change compared with conventional structures. The load detection circuit and the dynamic zero compensation circuit have no static power consumption and no influence for the current efficiency of the whole low-dropout linear voltage regulator.

Description

technical field [0001] The invention relates to the technical field of low-dropout linear voltage regulators, and more specifically refers to a fast transient response low-dropout linear voltage regulator with a load detection circuit and a dynamic zero point compensation circuit. Background technique [0002] Low-dropout linear regulator is an important part of the on-chip power management system module. It is widely used because of its advantages of small input and output voltage drop, small area, high current utilization rate, and easy integration. However, when the external load changes, there will be spikes in the output voltage and a transient response time t r to return to a stable state. The existence of these spikes will have a fatal impact on the performance of the powered modules, especially the analog modules. In addition, in order to ensure the normal operation of the low-dropout linear regulator, it is usually necessary to connect an external device with spec...

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Problems solved by technology

[0004] At present, the design and optimization of many low-dropout linear regulators are devoted to improving the transient response performance of the linear regulator, such as adding other loop gain adjustment circuits between the error amplifier and the voltage buffer or optimizing the voltage buffer , but these designs often result in complex circuit structures and increased power consumption due to the introduction of additional circuits

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