High-performance low-dropout regulator achieved by fast transient mechanism

Author

Huang, Hong-Wei ; Lin, Chia-Hsiang ; Chen, Ke-Horng

Author_Institution

RichTek Technol. Corp., Hsinchu

fYear

2008

fDate

15-19 Sept. 2008

Firstpage

350

Lastpage

353

Abstract

An adaptive reference control (ARC) technique is proposed for minimizing overshoot/undershoot voltage and settling time of low-dropout regulators (LDO). Linear operation provided by ARC technique can dynamically and smoothly adjust the reference voltage for increasing slew rate of error amplifier and forcing output voltage back to its steady-state value rapidly. The amount of transient revision is proportional to transient-state output voltage variation and load condition. In addition, dynamic push-pull technique is used to enhance transient response. Experimental results demonstrate the undershoot voltage, settling time and load regulation are improved 31%, 68.5% and 70% when load current changes between 1 mA and 100 mA.

Keywords

amplifiers; controllers; model reference adaptive control systems; transient response; adaptive reference control; error amplifier; fast transient mechanism; high-performance low-dropout regulator; slew rate; transient response; Adaptive control; Load management; Mirrors; Power transistors; Programmable control; Regulators; Time factors; Transconductance; Transient response; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference, 2008. ESSCIRC 2008. 34th European

Conference_Location

Edinburgh

ISSN

1930-8833

Print_ISBN

978-1-4244-2361-3

Electronic_ISBN

1930-8833

Type

conf

DOI

10.1109/ESSCIRC.2008.4681864

Filename

4681864