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High-slew-rate error amplifier-based high-accuracy and high-speed low dropout (LDO) regulator circuit

An error amplifier, high-precision technology, used in instruments, regulating electrical variables, control/regulating systems, etc., can solve the problems of low gain, low power supply rejection ratio, slow response speed of LDO, etc., to achieve system stability, low power consumption, high gain effect

Inactive Publication Date: 2011-06-15
SOUTHEAST UNIV
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a high-precision high-speed LDO circuit based on a large slew rate error amplifier based on the defects of the prior art, and adopt a system architecture based on a high slew rate error amplifier and load detection dynamic adaptive compensation and a super source follower , which solves the problems of low gain, low precision, low power supply rejection ratio and slow response speed of traditional LDO, and effectively reduces the voltage overshoot and undershoot generated by the system when the load changes suddenly

Method used

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  • High-slew-rate error amplifier-based high-accuracy and high-speed low dropout (LDO) regulator circuit

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Embodiment Construction

[0020] Below in conjunction with accompanying drawing, the technical scheme realization method of invention is described:

[0021] The system block diagram of the present invention is as figure 2 As shown, the error amplifier has a two-stage structure, the output drain is driven by full swing, the input stage is adaptive to a high slew rate structure, and the output stage is driven by a Push-Pull structure; since the compensation does not consider the effect of the ESR zero point, the ESR resistance is 5mΩ. C L = The zero frequency at 4.7μF is 6.78MHz, which is generally much larger than the unity gain bandwidth of the loop, and its influence can be ignored.

[0022] The differential input stage of the error amplifier is used as image 3 The OTA system architecture shown adopts the improved structure of two pairs of adaptive nonlinear current mirrors, one group is composed of M3, M5 and M9, and the other group is composed of M4, M6 and M10. In the case of static small sign...

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Abstract

The invention discloses a high-slew-rate error amplifier-based high-accuracy and high-speed low dropout (LDO) regulator circuit, which comprises an over-the-air (OTA) circuit, a second-stage push-pull output circuit, a Miller compensation and dynamic zero compensation circuit, a load current detection circuit, a super source-level follower, a dynamic offset pipe, a feedback network and an output and load circuit. By the LDO circuit, the problems of low gain, low accuracy, low power supply suppression ratio and low response speed of the conventional LDO are solved.

Description

technical field [0001] The invention relates to a high-precision, high-speed, low-dropout linear regulator (LDO) circuit based on a high-slew-rate error amplifier, and belongs to the technical field of power management chip analog integrated circuits. Background technique [0002] Low-dropout linear regulator LDO is a step-down DC linear regulator. With the wide application of portable devices, the rapid development of computer, communication and automobile industries, power management chip technology continues to develop. Compared with DC-DC switching voltage converters, LDO has become an important circuit in power management chips due to its advantages of low cost, simple circuit structure, small chip area, low noise and high ripple suppression capability. With the improvement of power supply requirements of electronic systems, traditional LDOs can no longer meet people's requirements for chip efficiency, noise, precision, transient performance and other indicators. There...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 吴金苏丹马科龙寅
Owner SOUTHEAST UNIV
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