A Buck-Boost Hybrid DC-DC Converter for Wearable Health Monitoring Devices
نویسندگان
چکیده
A hybrid approach of the DC-DC conversion is presented for battery-operated portable electronics systems such as wearable health monitoring devices. A switched-capacitor (SC) DC-DC converter is steered by hysteretic control to provide buck-boost conversion with a flexible conversion ratio, and its output is regulated by a low-drop-out (LDO) regulator delivering a low-ripple DC output. The SC DC-DC converter consists of only 4 switches and 2 capacitors, and employs a combination of NMOS and PMOS transistors simplifying the gate drive scheme. The converter has been designed to work up to 30MHz switching frequency and provides 2.8V output from a battery supply varying from 3.5 to 2V over its discharge cycle. It has been fabricated in 0.18μm CMOS technology.
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تاریخ انتشار 2010