LDO (low dropout regulator) capable of outputting ultra-low quiescent current in self-adaptation way

Abstract

The invention relates to a large-scale integrated circuit, and provides a LDO (low dropout regulator) capable of outputting ultra-low quiescent current in a self-adaptation way. An LDO circuit can maintain high stability under the wide-range load condition, and has the characteristics of ultra-low quiescent current and fast response particularly under the load-free condition. Therefore the LDO has the technical scheme that the LDO capable of outputting ultra-low quiescent current in the self-adaptation way consists of two gain amplification stages, two CMOS (complementary metal oxide semiconductor) power transistor loops, a feedback loop, an overshoot reducing loop and a frequency compensation loop, wherein input signals are input by an inverted input end of the first gain amplification stage and are then output sequentially through the second gain amplification stage and the first CMOS power transistor loop, and the output of the first gain amplification stage is directly output to the output end of the first CMOS power transistor loop through the second CMOS power transistor loop. The large-scale integrated circuit is mainly applied to the design manufacturing of large-scale integrated circuits.

Description

technical field [0001] The invention relates to a large-scale integrated circuit, a low-voltage low-power consumption circuit, and a low-dropout linear regulator (LDO). Specifically, it relates to a low-dropout linear voltage regulator with adaptive output ultra-low quiescent current. Background technique [0002] Modern high-speed development of power management units requires many voltage modulators to supply power to each functional module. For high-performance, high-sensitivity digital-analog or mixed-signal modules, a low-dropout linear regulator (LDO) is an ideal choice. However, it is not easy for the LDO to maintain stability when driving a load capacitance of hundreds of pf. The research on LDO without output capacitor (OCL-LDO) is a very popular direction, because it can reduce the influence of parasitic capacitance between the connections of hundreds of I / O pads on the chip on the chip. [0003] Also for portable units such as cell phone batteries, low quiescen...

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Problems solved by technology

However, it is not easy for the LDO to maintain stability when driving a load capacitance of hundreds of pf

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