| Citation: |
Yuan Bing, Lai Xinquan, Li Yanming, Ye Qiang, Wang Hongyi, Jia Xinzhang. High Efficiency Realization of a DC-DC Converter at Light Loads for Portable Applications[J]. Journal of Semiconductors, 2008, In Press.
Yuan B, Lai X Q, Li Y M, Ye Q, Wang H Y, Jia X Z. High Efficiency Realization of a DC-DC Converter at Light Loads for Portable Applications[J]. J. Semicond., 2008, 29(6): 1198.
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High Efficiency Realization of a DC-DC Converter at Light Loads for Portable Applications
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Abstract
A novel control structure for a DC-DC converter is presented.At light loads,the chip enters power save mode automatically and works in fixed peak current mode with standby intervals by detecting the feedback voltage.It reduces the average quiescent and switching power loss greatly,which increases efficiency at light loads and extends battery life in portable systems.Internal synchronous rectification eliminates the need for a Schottky diode and increases efficiency further.A DC-DC buck converter with the proposed structure has been fabricated with a 0.5μm CMOS process for validation.Under the condition of 3.6V input and 1.8V output,the quiescent current in the standby state is only 25μA.The measured efficiency for a 0.1mA load current is up to 62% and the maximum efficiency is 96%.-
Keywords:
- DC-DC buck converters,
- efficiency,
- light loads,
- power save mode,
- standby state
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References
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Proportional views
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