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A Design of Low Dropout Linear Regulator with Backup Supply Switching

Author: ChenJu
Tutor: GaoMingLun
School: Hefei University of Technology
Course: Microelectronics and Solid State Electronics
Keywords: LDO Linear regulator Standby Power Switch
CLC: TM44
Type: Master's thesis
Year: 2006
Downloads: 275
Quote: 0
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Abstract


This thesis is to design a linear regulator with standby power supply , it can switch between standby power and external power supply , the output is almost no glitches and output current and quiescent current , it power supply module suitable for mobile phone , MP3, digital cameras and other hand-held mobile devices . The linear regulator has two operating modes , when the external power supply circuit work in LDO mode , the output value of the stability of the voltage of 3.3V . When the external power supply is removed , the circuit operates in the standby power supply mode , it directly to the backup supply voltage connected to the load . The entire circuit contains the error amplifier, the conducting pipe , bandgap reference , feedback loop the LDO circuit module , there is a standby power mode of operation of the low resistance PMOS switch and mode switching logic used by the control circuit , and to ensure the the chip to work overheat protection circuit and current limit protection circuit . Discussed in detail and describes the the important circuit module design . The circuit design of the simulation model is based on modern microelectronic 0.5 - micron CMOS standard process , operating voltage of 4.4 volts to 6 volts . The final simulation results show that the LDO design with high accuracy , the linear regulator 0.8 % / V Load regulation of 1 % / mA . This paper also shows the simulation results LDO performance .

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