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Low dropout regulator

A low-dropout linear voltage regulator technology, applied in instruments, regulating electrical variables, control/regulating systems, etc., can solve problems such as long stabilization time, excessive output voltage jump fluctuations, etc., to reduce static power consumption, circuit Simple structure, the effect of improving transient response speed and accuracy

Inactive Publication Date: 2013-06-05
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention provides a low-dropout linear voltage regulator. In order to solve the problem of excessive fluctuation of the output voltage jump caused by the load jump of the low-dropout linear voltage regulator and the long time from fluctuation to stabilization, the increase in circuit structure and reduce power consumption

Method used

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Embodiment Construction

[0020] Such as figure 2 The low dropout linear regulator (LDO) shown in the present invention includes a feedback circuit 100 and a reference voltage unit Vref connected to the negative pole of the error amplifier EA. The reference voltage unit Vref is a bandgap reference circuit. The feedback circuit 100 is composed of a first pass element MP with a P-type MOS transistor structure, a first resistor R1 and a second resistor R2. The gate of the first conduction element MP is connected to the output terminal of the error amplifier EA, the source of the first conduction element MP is connected to the power supply Vin, and the drain is connected to the output terminal Vout of the voltage regulator. A resistor branch and an external capacitor branch are also connected in parallel between the output terminal Vout of the voltage regulator and the ground. There are a first resistor R1 and a second resistor R2 connected in series in the resistor branch, and a feedback signal Vfb is t...

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Abstract

The invention relates to a low dropout regulator. The low dropout regulator comprises a feedback circuit, a reference voltage unit which is connected with the cathode of an error amplifier. A control end of a first on-element in the feedback circuit is connected with an output end of the error amplifier. An input end of the first on-element and an output end of the first on-element are respectively connected with a power supply and an output end of the regulator. A resistor branch and a circumscribed capacitor branch are connected between the output end of the regulator and ground in parallel. The resistor branch is provided with a first resistor and a second resistor. The first resistor and the second resistor are in series. The anode of the error amplifier is connected with the first resistor and the second resistor. The first resistor and the second resistor feed back signals. An output end of a second on-element is connected with the ground through a third resistor. An input end of the second on-element is connected with the output end of the regulator, and a control end of the second on-element is connected with the output end of the error amplifier. The problems that transmission voltage fluctuation is too large and stable time is too long caused by load current saltus step of the low dropout regulator are solved, static power consumption increase is reduced to a maximized degree, the circuit structure is simple, transient response speed and precision of low dropout regulator (LDO) circuits are greatly improved.

Description

technical field [0001] The present invention relates to an integrated circuit, specifically a circuit structure of a fast-response low-dropout linear regulator (Low Dropout Regulator, LDO). Background technique [0002] With the rapid development of electronic technology, various portable electronic devices continue to increase their demands for multimedia data streaming, audio playback, clearer display and more entertainment, and efficient power management solutions are becoming more and more important. Low dropout linear regulator (LDO) has become one of the most competitive power supply solutions due to its low cost, easy packaging, few peripheral devices, ultra-low noise, high power supply rejection ratio and micro power consumption. [0003] Traditional LDOs such as figure 1 As shown, it includes a reference voltage unit Vref, an error amplifier EA, a feedback circuit 100, an external capacitor C, an output terminal Vout of a voltage regulator, and an input power suppl...

Claims

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Application Information

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IPC IPC(8): G05F1/56
Inventor 于奇李鹏王成碧陈文斌颜义民左迪虎宁宁
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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