Transient enhancement circuit applied to low-power-consumption fully-integrated low-dropout linear regulator

Abstract

The invention discloses a transient enhancement circuit applied to a low-power-consumption fully-integrated low dropout regulator. The transient enhancement circuit comprises an LDO control main loop, an undershoot suppression circuit, an undershoot recovery circuit, an overshoot suppression circuit and an overshoot recovery circuit. According to the circuit, overshoot suppression and transient enhancement of output voltage are realized by detecting transient voltage change of an output node of a power MOS (Metal Oxide Semiconductor) tube: when light load and heavy load of load current are instantaneously switched, a corresponding suppression circuit and a corresponding recovery circuit work, and corresponding pull-up current and pull-down current are provided, so that overshoot of the output voltage is suppressed, and recovery is accelerated. Moreover, when the output voltage is stable, all pull-up MOS tubes and pull-down MOS tubes of the transient enhancement circuit are turned off, and excessive static power consumption is not increased. A simulation result shows that the response capability of the low-power-consumption fully-integrated low-dropout linear regulator to transient change of load current can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of low-dropout linear voltage regulator circuits, and in particular relates to a transient enhancement circuit applied to low-power fully integrated low-dropout linear voltage regulators. Background technique [0002] As an important circuit module in the power management unit, the low-dropout linear regulator is widely integrated in the system on chip, digital chip, and high-performance analog-to-digital / digital-to-analog conversion chip. In the above-mentioned high-speed circuits, the operating frequency of the digital circuit is getting higher and higher, which can reach several GHz at present, and the instantaneous jump of the level will cause the rapid change of the current. If the digital circuit is used as the load of the low-dropout linear regulator, the fast jumping load current will have a great impact on the output voltage of the low-dropout linear regulator, so it is necessary to consider the loa...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a transient enhancement circuit applied to a low-power fully integrated low-dropout linear regulator for the low power consumption of the low-dropout linear regulator and the deterioration of the transient response performance of the fully integrated design. Improving Transient Response of Low-Power Fully Integrated Low-Dropout Linear Regulators

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