Abstract
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 pulse-width modulation (PWM) and pulse-frequency modulation (PFM) both with very high conversion efficiency. 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 V 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.
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