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Precision Dual Channel LDO Linear Regulator Design and Simulation

Author: QinLuLin
Tutor: YuQi；LiWenChang
School: University of Electronic Science and Technology
Course: Software Engineering
Keywords: Low dropout voltage linear regulator reference power load transient response
CLC: TM44
Type: Master's thesis
Year: 2011
Downloads: 67
Quote: 0
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Abstract


With the rapid development of electronic technology, a variety of portable electronic are rising demand for multimedia streaming, audio playback, sharper display and more entertainment. Therefore, efficient power management program has become increasingly important. Because of its low cost, easy packaging, peripherals small, ultra-low noise, high PSRR and low power consumption and other characteristics, so low dropout linear regulator become a very competitive method for the solution of power management.This paper successfully designed a LDO linear regulator with high stability which is the power management module in the driver IC of small size display, basing on circuit structure and working principle of LDO. It has a wide input voltage range (2.3V ~5.5V). Preset output voltage is 1.8V. Maximum load current is 120mA. Achieve the smaller load regulation (0.12mV/mA) and linear regulation rate (0.096%).In this paper, the internal sub-modules designed of LDO linear regulator include: the power devices, the reference power, the error amplifier and resistor feedback network. Foucs on the design of regulating the output voltage with digital signal and optimizing the load transient response which base on the idea of dynamic leaker for load current. Finally, Cadence Spectre software is used to complete the overall circuit design and circuit simulation. The results show that the LDO designed completed circuit function and reached the purpose of pre-requirement.

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Stabilizer
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