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A high efficiency dual-mode buck converter IC for portable applications

Author:: Liou, Wan-Rone Yeh, Mei-Ling Kuo, Yueh Lung
Journal:: IEEE TRANSACTIONS ON POWER ELECTRONICS
Issue Date:: 2008
Abstract(summary):: This paper presents the design of a novel wide output current range dual-mode dc to dc step-down (Buck) switching regulator/converter. The converter can adaptively switch between pulsewidth modulation (PWM) and pulse-frequency modulation (PFM) both with very high conversion efficiency. Under light load condition the converter enters PFM mode. The function of closing internal idle circuits is implemented to save unnecessary switching losses. The converter can be switched to PWM mode when the load current is greater than 100 mA. Soft start operation is designed to eliminate the excess large current at the start up of the regulator. The chip has been fabricated with a TSMC 2P4M 0.35 mu m polycide CMOS process. The range of the operation voltage is from 2.7 to 5 V, which is suitable for single-cell lithium-ion battery supply applications. The maximum conversion efficiency is 95 % at 50 mA load current. Above 85 % conversion efficiency can be reached for load current from 3 to 460 mA.
Page:: 667---677

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Li, Sizhen, Zou, Xuecheng, Chen, Xiaofei, Gan, Quan. Designing a compact soft-start scheme for voltage-mode DC-DC switching converters[J]. MICROELECTRONICS JOURNAL,2010:430---439.
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Kapat, Santanu, Banerjee, Soumitro, Patra, Amit. Discontinuous Map Analysis of a DC-DC Converter Governed by Pulse Skipping Modulation[J]. IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS,2010:1793---1801.
Huang, Ping-Ching, Wu, Wei-Quan, Ho, Hsin-Hsin, Chen, Ke-Horng. Hybrid Buck-Boost Feedforward and Reduced Average Inductor Current Techniques in Fast Line Transient and High-Efficiency Buck-Boost Converter[J]. IEEE TRANSACTIONS ON POWER ELECTRONICS,2010:719---730.
Bonizzoni, Edoardo, Borghetti, Fausto, Malcovati, Piero, Maloberti, Franco. A 200-mA, 93% peak power efficiency, single-inductor, dual-output DC-DC buck converter[J]. ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING,2010:121---129.
Tsai, Jen-Chieh, Huang, Tsung-Ying, Lai, Wang-Wei, Chen, Ke-Horng. Dual Modulation Technique for High Efficiency in High-Switching Buck Converters Over a Wide Load Range[J]. IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS,2011:1671---1680.
Babaei, Ebrahim, Mahmoodieh, Mir Esmaeel Seyed, Sabahi, Mehran. Investigating Buck DC-DC Converter Operation in Different Operational Modes and Obtaining the Minimum Output Voltage Ripple Considering Filter Size[J]. JOURNAL OF POWER ELECTRONICS,2011:793---800.

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A high efficiency dual-mode buck converter IC for portable applications

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