NDLI: An ultra-low-power digitally-controlled buck converter IC for cellular phone applications

Content Provider	IEEE Xplore Digital Library
Author	Xiao, J. Peterchev, A. Zhang, J. Sanders, S.
Copyright Year	2004
Description	Author affiliation: California Univ., Berkeley, CA, USA (Xiao, J.; Peterchev, A.; Zhang, J.; Sanders, S.)
Abstract	This paper describes a dual-mode digitally-controlled buck converter IC for cellular phone applications. An architecture employing internal power management is introduced to ensure voltage compatibility between a single-cell lithium-ion battery voltage and a low voltage integrated circuit technology. Special purpose analog and digital interface elements are developed. These include a ring-oscillator based ADC (ring-ADC), which is nearly entirely synthesizable, robust against switching noise, and has flexible resolution control, and a very low power ring oscillator-multiplexer based digital PWM generation module (ring-MUX DPWM). The chip, which includes an output power stage rated for 400 mA, occupies 2 mm/sup 2/ active area in 0.25 /spl mu/m CMOS. Very high efficiencies are achieved over a load range of 0.1 to 400 mA. Measured quiescent current in PFM mode is 4 /spl mu/A.
Sponsorship	IEEE Power Sources Manufacturers Association PELS IEEE Industry Applications Soc
Starting Page	383
Ending Page	391
File Size	1988097
Page Count	9
File Format	PDF
ISBN	0780382692
DOI	10.1109/APEC.2004.1295838
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-02-22
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Buck converters Application specific integrated circuits Digital integrated circuits Cellular phones Low voltage Pulse width modulation Power generation Battery management systems Energy management Technology management
Content Type	Text
Resource Type	Article

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