A High-Efficiency, Dual-Mode, Dynamic, Buck-Boost Power Supply IC for Portable Applications

Abstract—Integrated power supplies are critical building blocks in stateof-the-art portable applications, where they efficiently and accurately transform a battery supply into various regulated voltages, as required by their loads. This paper presents a novel low voltage, dual-mode, buck-boost converter IC targeted for dynamic supplies of linear RF power amplifiers (PAs) in wireless handsets. Maintaining high efficiency of the converter over a wide loading range is critical for improving battery life in such systems. The use of a novel supply voltage using adaptive on time control for pulse-frequency-modulation (PFM) mode achieves an accurate output ripple voltage, not to mention higher efficiency under light loads, which is important in portable applications. In the high-power mode, the converter is operated in a modified pulse-width-modulated (PWM) control, where its operation is changed adaptively between the buck, buck-boost, and boost regions, thereby saving unnecessary switchin...

• Type: Conference
• Year: 2005
• Where: VLSID
• Authors: Biranchinath Sahu, Gabriel A. Rincón-Mora
• Keywords: Computer Architecture, Output Ripple Voltage, Portable Applications, Supply Voltage, VLSID 2005