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Low-dropout linear regulator and chip

A technology of low-dropout linearity and voltage regulators, which is applied in the direction of instruments, electric variable adjustment, control/regulation systems, etc., can solve problems such as high cost and complex circuit structure, and achieve low cost, simple circuit structure, and low static power consumption Effect

Active Publication Date: 2012-07-18
SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a low-dropout linear voltage regulator, aiming to solve the problems existing in the prior art that it is difficult to provide a fixed working voltage for integrated circuits under low power consumption conditions, and the circuit structure is complicated and the cost is high

Method used

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  • Low-dropout linear regulator and chip

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Embodiment 1

[0018] figure 1 The module structure of the low-dropout linear regulator provided by the first embodiment of the present invention is shown. For the convenience of description, only the parts related to the first embodiment of the present invention are shown, and the details are as follows:

[0019] The low dropout linear voltage regulator is connected to the DC power supply 100 and the load 200, and the low dropout linear voltage regulator includes:

[0020] The current source module 300, the first current mirror 400, the current mirror driving module 500, the second current mirror 600, the third current mirror 700, the fourth current mirror 800, the fifth current mirror 900 and the first Zener diode D1;

[0021] The first input terminal of the current source module 300 is connected with the output terminal of the DC power supply 100, the input terminal of the first current mirror 400, the input terminal of the second current mirror 600 and the input terminal of the third cur...

Embodiment 2

[0025] figure 2 The example circuit structure of the low-dropout linear regulator provided by the second embodiment of the present invention is shown. For the convenience of description, only the parts related to the second embodiment of the present invention are shown, and the details are as follows:

[0026] As an embodiment of the present invention, the current source module 300 includes:

[0027] Resistor R3, NMOS tube M1, NMOS tube M2 and resistor R4;

[0028] The first end of the resistor R3 is the first input end of the current source module 300, the drain of the NMOS transistor M1 is the second input end of the current source module 300, and the gate of the NMOS transistor M1 is simultaneously connected to the second end of the resistor R3 and the NMOS transistor The drain of M2 is connected, the gate of NMOS transistor M2 is connected with the source of NMOS transistor M1 and the first end of resistor R4 at the same time, the source of NMOS transistor M2 is the outp...

Embodiment 3

[0043] image 3 The example circuit structure of the low-dropout linear regulator provided by the third embodiment of the present invention is shown. For the convenience of description, only the parts related to the third embodiment of the present invention are shown, and the details are as follows:

[0044] As an embodiment of the present invention, the current source module 300 includes:

[0045] Resistor R5, NPN transistor M14, NPN transistor M15 and resistor R6;

[0046] The first end of the resistor R5 is the first input end of the current source module 300, the collector of the NPN transistor M14 is the second input end of the current source module 300, and the base of the NPN transistor M14 is simultaneously connected to the second end of the resistor R5. and the collector of the NPN transistor M15, the base of the NPN transistor M15 is simultaneously connected to the emitter of the NPN transistor M14 and the first end of the resistor R6, and the emitter of the NPN tra...

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Abstract

The invention belongs to the field of IC (integrated circuit) design, and provides a low-dropout linear regulator and a chip. The low-dropout linear regulator comprises a current source module, a first current mirror, a current mirror drive module, a second current mirror, a third current mirror, a fourth current mirror, a fifth current mirror, and a first voltage regulating diode. The low-dropout linear regulator provided by the invention can automatically regulate the output voltage when a supply current to a load changes so as to provide a fixed work voltage to the load, and is simple in circuit structure, small in static power consumption and low in cost. Accordingly, the low-dropout linear regulator solves the problems of difficulty in providing the fixed work voltage to the IC under the condition of low power consumption, complexity in the circuit structure and high cost.

Description

technical field [0001] The invention belongs to the field of integrated circuit design, in particular to a low-dropout linear regulator and a chip. Background technique [0002] At present, in the field of integrated circuit design, a low-power low-dropout linear voltage regulator is widely used in various integrated circuits as a power supply circuit that can provide a stable operating voltage for electronic systems. [0003] In the low-power low-dropout linear regulator provided by the prior art, an operational amplifier, a bandgap voltage reference source and a frequency compensation network are generally used. Although it can achieve the purpose of providing an operating voltage for the integrated circuit, the entire circuit structure It is more complex, costly, and it is difficult to meet application requirements under low power consumption conditions. Therefore, the existing technology is difficult to provide a fixed working voltage for the integrated circuit under th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 罗贤亮吴小晔邵彦生白骥
Owner SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD
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