Design and Analysis of a Boost Mode Switched-capacitor DC/DC Converter
Date Issued
2005
Date
2005
Author(s)
Wu, Min-Shing
DOI
en-US
Abstract
In recent years, owing to the development of electronic equipments, such as MP3 players, cellular phones, PDAs, and digital cameras, DC/DC converters have become more and more important since these electronic devices must be powered by a single Li-ion battery or some Ni-MH/Ni-Cd batteries.
This thesis presents a boost mode switched-capacitor DC/DC converter which contains a bandgap reference, an oscillator, a pumping circuit, and some features including thermal shutdown protection, short-circuit current limiting, and automatic soft-start which prevents the inrush current at the moment of power on. The regulated output voltage is 5V while the range of the operation voltage is from 2.7V to 5V that makes the converter ideally for a single cell Li-Ion battery source. When the input voltage is above 3.3V, the maximum output load current is up to 100mA and the output voltage is steadily 5V. Its conversion efficiency is up to 90%. This converter is simulated by H-Spice with 0.6μm BiCMOS process.
This thesis presents a boost mode switched-capacitor DC/DC converter which contains a bandgap reference, an oscillator, a pumping circuit, and some features including thermal shutdown protection, short-circuit current limiting, and automatic soft-start which prevents the inrush current at the moment of power on. The regulated output voltage is 5V while the range of the operation voltage is from 2.7V to 5V that makes the converter ideally for a single cell Li-Ion battery source. When the input voltage is above 3.3V, the maximum output load current is up to 100mA and the output voltage is steadily 5V. Its conversion efficiency is up to 90%. This converter is simulated by H-Spice with 0.6μm BiCMOS process.
Subjects
直流轉換器
交換電容
DC/DC converter
switched-capacitor
Type
thesis