Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Low dropout regulator

A low-dropout regulator, amplifier technology, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve the problems of manufacturing process and temperature effects, insufficient frequency compensation, insufficient power supply rejection ratio, etc., and achieve stable resolution. Effect

Inactive Publication Date: 2010-03-24
MEDIATEK SINGAPORE PTE LTD SINGAPORE
View PDF0 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention provides a low-dropout (LDO) regulator, which aims to solve the shortcomings of the existing low-dropout regulators that the power supply rejection ratio is not high enough, the frequency compensation is not good enough, and it is easily affected by the manufacturing process and temperature.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Low dropout regulator
  • Low dropout regulator
  • Low dropout regulator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0032] In order to make the object, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0033] image 3 It is a schematic diagram of a low-dropout regulator according to an embodiment of the present invention. As shown in the figure, the low dropout regulator 30 has a first-stage amplifier 301, a buffer 302, a bypass transistor MP, a first resistor R A and the second resistor R B . The first end (-) of the first stage amplifier 301 receives the reference signal V REF , and its second terminal (+) receives a feedback signal. According to the reference signal VREF And the feedback signal, the output terminal (x) of the first stage amplifier 301 can output a compensation resu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides adequate compensation for a wide range of output loads, a low dropout (LDO) regulator has an amplifier, a pass transistor, a voltage divider, a compensation network, and a control circuit. The amplifier outputs a comparison result according to a reference signal and a feedback signal. The pass transistor generates an output current based on the comparison result of the amplifier. The voltage divider generates the feedback signal according to the output current. The compensation network couples the output of the pass transistor to a low-impedance node of the amplifier, and has a compensation capacitor and a variable resistor coupled to the compensation capacitor. The control circuit is coupled to the input of the pass transistor and to the variable resistor for controlling resistance of the variable resistor according to the output current of the pass transistor. The low dropout regulator provides better frequency compensation and more stable resolution and prevents the compensation effect influenced by manufacture technology and temperature.

Description

technical field [0001] The invention relates to a low dropout regulator, in particular to a low dropout regulator with a variable impedance load compensation circuit. Background technique [0002] The voltage regulation circuit is usually arranged between the power supply circuit and the load circuit. When the voltage generated by the power supply circuit fluctuates, the voltage regulation circuit can still provide a fixed voltage to the load circuit. Taking the battery used in a mobile phone as an example, if the battery is not charged, the voltage of the battery may drop. However, through the voltage regulating circuit, even if the output voltage of the battery drops, as long as the voltage of the battery is greater than the fixed voltage provided by the voltage regulating circuit, the voltage regulating circuit can continuously provide a fixed voltage to the load circuit of the mobile phone. In order for the voltage regulation circuit to provide a constant voltage, a dr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/56G05F1/575
Inventor 达思古帕塔·尤达坦吉尔·爱立克森德
Owner MEDIATEK SINGAPORE PTE LTD SINGAPORE
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com