Design of wide power supply, high performance voltage regulator with BCD process

Author

Liu, Zhidong ; Jin, Xigen ; Jin, Ning ; He, Yuan ; Cheng, Yuhua

Author_Institution

Shanghai Res. Inst. of Microelectron., Peking Univ., Shanghai, China

fYear

2010

fDate

22-24 Sept. 2010

Firstpage

170

Lastpage

173

Abstract

This paper analyzes a voltage regulator with widely range of power supply which is essential module in switching mode power supply. It is composed of Pre-charging Circuit, Bandgap Reference Circuit, Current Reference Circuit, Thermal Protect Circuit and Low-dropout (LDO) regulator. A frequency compensation method with buffer stage isolation is utilized, that conduces to the improvements of transient response and PSR performance of the LDO. This regulator is fabricated with BCD technology, has a wide range of power supply from 5.2 to 25 V and functions of current limiting and thermal protection. Simulation results show that, the output voltage and current are 5V and 80mA. While the overshoot and undershoot of the output voltages are less than 45mV and 80mV, respectively, when the load current changes at a rate of 50 mA/μs. The PSR is more than 95.2dB@DC. Also, an internal 1.22V bandgap reference voltage, proportional to absolute temperature (PTAT) current reference and zero temperature coefficient (TC) current reference are produced.

Keywords

power supply circuits; reference circuits; voltage regulators; bandgap reference circuit; bandgap reference voltage; buffer stage isolation; current 45 mA to 80 mA; current reference circuit; frequency compensation method; low-dropout regulator; precharging circuit; switching mode power supply; thermal protect circuit; thermal protection; voltage 1.22 V to 25 V; voltage regulator; wide power supply; zero temperature coefficient current reference; Circuit stability; Photonic band gap; Power supplies; Regulators; Resistance; Stability analysis; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Microelectronics and Electronics (PrimeAsia), 2010 Asia Pacific Conference on Postgraduate Research in

Conference_Location

Shanghai

Print_ISBN

978-1-4244-6735-8

Electronic_ISBN

978-1-4244-6736-5

Type

conf

DOI

10.1109/PRIMEASIA.2010.5604935

Filename

5604935