Title :
Component-Efficient Multiphase Switched-Capacitor DC–DC Converter With Configurable Conversion Ratios for LCD Driver Applications
Author :
Su, Feng ; Ki, Wing-Hung
Author_Institution :
Dept. of Electron. & Comput. Eng., Hong Kong Univ. of Sci. & Technol., Hong Kong
Abstract :
A CMOS 3/4-phase switched capacitor dc-dc converter with configurable conversion ratios of 4 times /5 times /6 times /7times is proposed for liquid crystal display driver applications. The 3/4-phase driving scheme requires only 3 off-chip flying capacitors and 5 package pins. The converter core, input voltage monitor, 3/4-phase clock generator and bandgap voltage reference were integrated using a 0.35-mum high-voltage CMOS process. The input voltage ranges from 2.5 to 5 V, and the output voltage is higher than 15 V with a load current of 500 muA. Measurement results confirmed the validity and performance of the driving scheme.
Keywords :
CMOS integrated circuits; DC-DC power convertors; capacitors; driver circuits; liquid crystal displays; switching circuits; LCD driver applications; bandgap voltage reference; clock generator; component-efficient multiphase switched-capacitor DC-DC converter; configurable conversion ratios; converter core; current 500 muA; high-voltage CMOS process; input voltage monitor; input voltage ranges; liquid crystal display driver applications; load current; off-chip flying capacitors; size 0.35 mum; voltage 2.5 V to 5 V; voltage output; Charge pump; gate control; liquid crystal display (LCD) driver; multiphase; switched-capacitor dc–dc converter;
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2008.922467
