High-PSR (high power supply rejection) low-dropout regulator with slew rate enhancement circuit integrated thereto

Abstract

The invention relates to power management technologies, solves the problem that generally voltage spike in output voltage is overcome for the existing low-dropout regulator at the costs of increased circuit complexity, decreased load capacity, increased output voltage noise and the like, and provides a High-PSR (high power supply rejection) low-dropout regulator with a slew rate enhancement circuit integrated thereto. According to the scheme, the regulator compared to the existing LDO regulators has the advantages that the slew rate enhancement circuit and a compensation capacitor are added, the positive phase input end of an error amplifier is connected with a reference voltage source, the negative phase input end of the error amplifier is connected with a resistance feedback circuit, the output end of the error amplifier is connected with the input end of the slew rate enhancement circuit, the output end of the slew rate enhancement circuit is connected with a gate of a pass transistor, one end of the compensation capacitor is connected with the negative phase input end of the error amplifier, and the other end of the compensation capacitor is connected with the output end of the error amplifier. The high-PSR low-dropout regulator has the advantages that transient response is enhanced and the scheme is applied to low-dropout regulators.

Description

technical field [0001] The invention relates to power management technology, in particular to the technology of low-dropout linear regulator. Background technique [0002] Low-dropout linear regulator (LDO) is an important circuit in the field of power management, which has the advantages of low output noise, low cost, simple structure, and low power consumption. With the continuous improvement of the power supply requirements of electronic systems, the traditional LDO can no longer meet people's requirements for chip noise, power supply rejection, transient performance and other indicators. Therefore, the study of high-performance LDO has become a research hotspot in the field of power management. [0003] like figure 1 As shown, a typical LDO circuit is generally composed of a reference voltage source Vref, an error amplifier, a power supply voltage input terminal VDD, a regulator tube Mp, and a resistor feedback circuit. The positive input terminal of the error amplifie...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the current low dropout linear regulators that mostly solve the problem of output voltage spikes at the cost of increasing circuit complexity, reducing load capacity, and increasing output voltage noise, and provides an integrated slew rate enhancement circuit. High PSR Low Dropout Linear Regulator

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