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

A technology of linear voltage regulator and dynamic zero point, which is applied in the direction of instruments, electric variable adjustment, control/regulation system, etc. It can solve the problems of increased power consumption and complex circuit structure, etc., and achieve small voltage spikes and fast transient response Ability, effect of unity gain frequency increase

CN103105883AInactive Publication Date: 2013-05-15INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2013-05-15
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0019] Hereinafter, examples of the present invention will be described in detail by referring to the accompanying drawings. However, this invention may be embodied in many different forms and should not be limited to the examples given herein so that this disclosure will be thorough and complete, and will fully convey to those skilled in the art Idea of ​​the present invention.

[0020] figure 1 Shown is a schematic circuit diagram of a traditional low-dropout linear regulator. The traditional low-dropout linear regulator consists of an error amplifier, a voltage buffer, a power transistor PMOS, and a first feedback resistor R f1 and the second feedback resistor R f2 constitute. The error amplifier is used to compare...