Integrated interleaving SC power converters with analog and digital control schemes for energy-efficient microsystems

被引:0
作者
Dongsheng Ma
Ling Su
Mohankumar Somasundaram
机构
[1] The University of Arizona,Department of Electrical and Computer Engineering
[2] Texas Instruments Inc.,undefined
来源
Analog Integrated Circuits and Signal Processing | 2010年 / 62卷
关键词
Interleaving switched-capacitor power converter; Efficiency optimization; -Domain loop gain analysis;
D O I
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中图分类号
学科分类号
摘要
This paper addresses design strategies and tradeoffs of a series of newly developed interleaving switched-capacitor power converters. In such a design, a converter consists of multiple sub-cells in the power stage, and is regulated with interleaving power flow control. By splitting the power flow in a time-sequenced manner, the converter maintains a continuous power delivery flow to the output VOUT, with significant reductions on the in-rush input current and the output voltage ripples. System modeling and optimization focusing on power efficiency and z-domain closed-loop gain enhancement are discussed. An experimental prototype was successfully fabricated with a standard 0.35-μm digital CMOS N-well process. The entire die area, including fully integrated pads and power devices, is 3.84 mm2. Measurement results show that, with a supply voltage of 1.5 V and a load of 250 mA, the output of the converter is well regulated at 2.5 V with 16-mV ripple. The maximum efficiency of 82.3% is achieved at the output power of 625 mW.
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页码:361 / 372
页数:11
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