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Low-dropout voltage regulator and operating method of the same

A voltage stabilizer and error amplifier technology, applied in the direction of instruments, regulating electrical variables, control/regulation systems, etc.

Inactive Publication Date: 2010-06-30
DONGBU HITEK CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a limit to improving the transient response of the output voltage by using only the error amplifier, so the above conventional LDO regulator should have a good slew rate for stabilizing the output voltage

Method used

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  • Low-dropout voltage regulator and operating method of the same
  • Low-dropout voltage regulator and operating method of the same
  • Low-dropout voltage regulator and operating method of the same

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Embodiment Construction

[0016] in instance figure 1 Among them, the LDO regulator according to the embodiment of the present invention includes: a reference voltage generator 100, an error amplifier 120, a first MOS transistor (M 1 ), level limiter 130 and voltage divider 140. The reference voltage generator 100 is electrically connected to the input voltage V IN and ground to generate a reference voltage V REF . The reference voltage generator 100 can be used to generate the reference voltage V REF The band gap voltage generator (bandgap voltage generator).

[0017] first MOS transistor M 1 may include a gate connected to the error signal delivered by the error amplifier 120, connected to the input voltage V IN The source is well connected to the output voltage V OUT the drain. For such a structure, the first MOS transistor M 1 Can be a PMOS power transistor. A first MOS transistor M as a pass device 1 The voltage can be called "drop-out". According to an embodiment of the present invent...

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PUM

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Abstract

A low-dropout (LDO) voltage regulator that includes an error amplifier which compares a reference voltage with a feedback voltage of an output voltage and outputs an error signal based on the result of the comparison, the error amplifier being biased by an input voltage; a first MOS transistor having a gate electrically connected to the error signal, a source electrically connected to the input voltage and a drain electrically connected to the output voltage; a voltage divider which transmits a predetermined part of the output voltage to the error amplifier as feedback voltage; and a level limiter which limits a level of the output voltage from changing beyond and below an offset voltage when a level of a load current changes. In accordance with embodiments, A predetermined number of comparators and MOS transistor type-switches are provided to enhance the slew ratio of the regulated output voltage and to reduce standby electricity consumption.

Description

[0001] This application claims priority from Korean Patent Application No. 10-2008-0132841 (filed on December 24, 2008) based on 35 U.S.C 119, the entire contents of which are hereby incorporated by reference. technical field [0002] The present invention relates to an electronic circuit, and more particularly, to a low-dropout voltage regulator and an operating method thereof. Background technique [0003] Low-dropout (LDO, low-dropout) regulators are generally used in powerfeeding equipment to provide regulated voltages. This LDO regulator consists of integrated circuits and can be used in various electronic products. Some or all of the components contained in the LDO regulator can be compatible with standard digital CMOS technology. [0004] U.S. Patent No. 6,046,577, titled "LOW-DROPOUT VOLTAGEREGULATOR INCORPORATING A CURRENT EFFICIIENTTRANSIENT RESPONSE BOOST CIRCUIT", and U.S. Patent Application No. 2007 / 0241728, titled "LOW-DROPOUT VOLTAGEREGULATOR WITH A VOLTAGE S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/573G05F1/565G05F1/575
Inventor 赵盛一方诚晚
Owner DONGBU HITEK CO LTD
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