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Low dropout linear regulator circuit

A low-dropout linear and voltage-stabilizing circuit technology, applied in the electronic field, can solve problems such as unstable output signals and achieve the effect of increasing frequency

Active Publication Date: 2016-09-07
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The problem solved by the invention is that the existing low-dropout linear voltage regulator circuit is prone to output signal instability

Method used

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Embodiment Construction

[0023] In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] Such as figure 2 As shown, Embodiment 1 of the present invention provides a low dropout linear voltage regulator circuit, including: error amplifier EA, first resistor R1, second resistor R2, first current mirror circuit 1, first NMOS transistor MN1, second NMOS The transistor MN2, the third NMOS transistor MN3, the first PMOS transistor MP1 and the second current mirror circuit 2.

[0025] The first input terminal of the error amplifier EA is suitable for inputting the reference voltage Vref, and the second input terminal is connected to the first terminal of the second resistor R2 and the second terminal of the first resistor R1.

[0026] The first terminal of the first current mirror circuit 1 is suitable for inputting the firs...

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PUM

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Abstract

A low drop-out linear voltage stabilization circuit comprises an error amplifier, a first resistor, a second resistor, a first current mirror circuit, a first NMOS transistor, a second NMOS transistor, a third NMOS transistor, a first PMOS transistor and a second current mirror circuit. According to the low drop-out linear voltage stabilization circuit, the frequency of a secondary pole can be improved, the distance between the secondary pole and a primary pole is enlarged, and therefore a stable signal is output.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a low-dropout linear regulator circuit. Background technique [0002] Compared with the existing technology, the Low Dropout Regulator (LDO) is a step-down DC linear regulator. With the development of SOC (System on Chip, System on Chip) , instrumentation, consumer electronics, camera monitoring and other industry applications are ubiquitous. Although compared with the DC-DC switching voltage converter, the efficiency of the LDO is lower, but it has the advantages of fewer peripheral components, small ripple, low noise, small chip area, and simple circuit structure, so the LDO is used in power management chips. has always held a large proportion. [0003] With the improvement of integration, more and more LDOs are integrated into the SOC chip as a sub-module of the SOC chip to supply power to a key module, and a powerful SOC chip integrates multiple LDO modules for different modules....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
Inventor 沈海峰
Owner SPREADTRUM COMM (SHANGHAI) CO LTD