Ultra fast fixed-frequency hysteretic buck converter with maximum charging current control and adaptive delay compensation for DVS applications

被引：99

作者：

Su, Feng ^{[1
]}

Ki, Wing-Hung ^{[1
]}

Tsui, Chi-Ying ^{[1
]}

机构：

[1] Hong Kong Univ Sci & Technol, Dept Elect & Comp Engn, Hong Kong, Hong Kong, Peoples R China

来源：

IEEE JOURNAL OF SOLID-STATE CIRCUITS | 2008年 / 43卷 / 04期

关键词：

adaptive delay compensation; adaptive output; current sensor; dynamic voltage scheduling (DVS); maximum charging current control; pseudocontinuous conduction mode (PCCM); rail-to-rail comparator; reference tracking;

D O I：

10.1109/JSSC.2008.917533

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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 mu m 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 Omega, the up-tracking speed of the maximum reference step (0.5 to 2.5 V) is 12.5 mu s/V. All design features are verified by extensive measurements.

引用

页码：815 / 822

页数：8

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