NDLI: A stable compensation scheme for low dropout regulator in the absence of ESR

Content Provider	IEEE Xplore Digital Library
Author	Tsz-Fai Kwok Wing-Hung Ki
Copyright Year	2007
Description	Author affiliation: Hong Kong Univ. of Sci. & Technol., Hong Kong (Tsz-Fai Kwok; Wing-Hung Ki)
Abstract	A new compensation scheme for low dropout regulator (LDR) in relaxing the constraint on the equivalent series resistance (ESR) down to the value of zero from no load to full load current condition is presented. This is achieved by introducing a load-tracking zero that tracks with the moving output pole as the load current varies, and a level shift buffer reduces the size and capacitance of the power transistor. The load-tracking circuit ensures the stability in full load current range even in the absence of ESR. The proposed LDR is fabricated with a standard 0.35 mum CMOS technology. Measurement results at very small value ESR (10 mOmega) and output capacitor (0.47 muF), where this equivalent ESR zero is far beyond the compensation region of LDR, confirm the stability at ESR equivalent value to be zero. Also the proposed compensation scheme allows a wide range of ESR from equivalent 0 Omega to 20 Omega and load capacitor from 0.47 muF to 22 muF with a load current of 0 muA to 100 mA at dropout voltage of 0.2 V.
Starting Page	416
Ending Page	419
File Size	313629
Page Count	4
File Format	PDF
ISBN	9781424411252
ISSN	19308833
DOI	10.1109/ESSCIRC.2007.4430331
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-09-11
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Regulators Paramagnetic resonance Poles and zeros Capacitors Voltage Frequency CMOS technology Stability Performance gain Bandwidth
Content Type	Text
Resource Type	Article

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