Low dropout regulator (LDO)

Abstract

The invention discloses a low dropout regulator (LDO). The regulator includes a first MOS transistor M1, a second MOS transistor M2, a third MOS transistor M3, a fourth MOS transistor M4, a fifth MOStransistor M5, a first resistor R1, a second resistor R2, a first MIM capacitor C1, a second MIM capacitor C2 and a first error amplifier AMP1. Sources of the first MOS transistor M1 and the fourth MOS transistor M4 are both connected with a power source Vcc. A gate of the first MOS transistor M1 is respectively connected with a drain of the fourth MOS transistor M4 and a drain of the fifth MOS transistor M5. A gate of the second MOS transistor M2 is grounded through the capacitor C1, and connected with an output of the error amplifier AMP1. A drain of the second MOS transistor M2 is respectively connected with sources of the third MOS transistor M3 and the fifth MOS transistor M5. A gate of the third MOS transistor M3 is connected with Vb3. A source of the third MOS transistor M3 is grounded. A gate of the fourth MOS transistor M4 is connected with Vb1. A gate of the fifth MOS transistor M5 is connected with Vb2. Compared with the prior art, the regulator has the advantage of having dual feedback loops of fast feedback and slow feedback at the same time.

Description

technical field [0001] The invention relates to the technical field of voltage regulators, in particular to a low-dropout linear voltage regulator. Background technique [0002] The low-dropout linear regulator is a fully integrated low-dropout linear regulator LDO module applied on-chip. Its purpose is to provide a linearly regulated power supply voltage for the sub-module in the chip, while minimizing the area and power and reducing the cost. At present, Designing low-dropout linear regulators (LDOs) in mainstream CMOS processes still faces some technical challenges. The main difficulty lies in the transient state of regulators with high output accuracy (precision) in ordinary low-dropout linear regulators The response voltage stabilization time is slow, and the voltage regulator with a fast voltage stabilization time has a low output accuracy. Contents of the invention [0003] The purpose of the present invention is to overcome the above technical defects and provide ...

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Problems solved by technology

[0005] Compared with the prior art, the present invention has the advantages that: the present invention proposes a new structure, and designs a dual feedback loop with fast feedback and slow feedback at the same time, which solves the problem of high output accuracy in the prior art. The transient response of the voltage regulator is slow, and the voltage stabilizer with a fast voltage stabilization time has a technical problem of low output accuracy

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