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Title: Ultra fast fixed frequency hysteretic buck converter with maximum charging current control and adaptive delay compensation for DVS applications
Authors: Su, Feng
Ki, Wing-Hung
Tsui, Chi-Ying
Keywords: Adaptive delay compensation
Adaptive output
Current sensor
Dynamic voltage scheduling (DVS)
Maximumcharging current control
Pseudocontinuous conduction mode(PCCM)
Rail-to-rail comparator
Reference tracking
Issue Date: 2008
Citation: IEEE journal of solid-state circuits, v. 43, no. 4, April 2008, p. 815-822
Abstract: An integrated DC–DC hysteretic buck converter with ultrafast adaptive output transient response for reference tracking is presented. To achieve the fastest up-tracking speed, the maximum charging current control is introduced to charge up the output voltage with the maximum designed current. For down-tracking, the output is discharged by the load only to save energy. Although the converter works with hysteretic voltage mode control, an adaptive delay compensation scheme is employed to keep the switching frequency constant at 850 kHz to within ±2.5% across the whole operation range. The integrated buck converter was fabricated using a 0.35 μm CMOS process.With an input voltage of 3 V, the output voltage can be regulated between 0.5 and 2.5 V. With a load resistor of 10 Ω, the up-tracking speed of the maximum reference step (0.5 to 2.5 V) is 12.5 μs/V. All design features are verified by extensive measurements.
Rights: © 2008 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.
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