標題: A Wide Load Range and High Efficiency Switched-Capacitor DC-DC Converter With Pseudo-Clock Controlled Load-dependent Frequency
作者: Chen, Wei-Chung
Ming, Da-Long
Su, Yi-Ping
Lee, Yu-Huei
Chen, Ke-Horng
電控工程研究所
Institute of Electrical and Control Engineering
關鍵字: Deep-green mode (DGM);lead-lag detector (LLD);load-dependent frequency control (LFC);pseudo-clock generator (PCG);switched-capacitor (SC);system-on-a-chip (SoC)
公開日期: 1-Mar-2014
摘要: A high efficiency 3.3V-to-1V switched-capacitor (SC) step-down DC-DC converter with load-dependent frequency control (LFC) and deep-green mode (DGM) operation is proposed for system-on-a-chip (SoC) application. According to output loading current, the LFC technique can immediately and dynamically adjust the switching frequency through the use of pseudo-clock generator (PCG) and lead-lag detector (LLD) circuit to obtain high power conversion efficiency and small output voltage ripple over a wide loading current range. Therefore, adequate loading current supplying function and output voltage regulation can be guaranteed. Moreover, the DGM operation, similar to pulse skipping mode, can mask the switching clock to reduce power loss at ultra-light loads for further improving power efficiency. The test chip fabricated in 55 nm CMOS process demonstrates that the proposed fast transient converter can deliver wide load range from 10 mA to 250 mA with two small flying capacitors (C-F1, C-F2 = 0.1 mu F) and one output capacitor (C-OUT = 1 mu F). The peak conversion efficiency is 89% compared to the ideal value of 91% (3 * V-OUT/V-IN). In other words, the peak normalized efficiency is equal to 98%. The overall normalized efficiency is always kept higher than 90% while the output voltage ripple is guaranteed smaller than 30 mV.
URI: http://dx.doi.org/10.1109/TCSI.2013.2284182
http://hdl.handle.net/11536/24016
ISSN: 1549-8328
DOI: 10.1109/TCSI.2013.2284182
期刊: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
Volume: 61
Issue: 3
起始頁: 911
結束頁: 921
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