An integrated reconfigurable SC Power converter with hybrid gate control scheme for mobile display driver applications

Abstract

An integrated switched-capacitor power converter with reconfigurable conversion ratios of 4times/5times/6times/7times/8times for mobile display driver applications is presented. This converter requires only four flying capacitors for realizing all the conversion ratios, and when achieving 4times and 5times, the original redundant flying capacitor is reconfigured to the dual-branch architecture to enhance efficiency. The advantages of both level-shifter and PN-switches control schemes are combined as a hybrid gate control scheme in eliminating reversion current. Gate switching loss of power transistors is reduced by a charge recycling mechanism. The design was fabricated in a 0.35 mum 50 V CMOS process. Measurement results confirm that the converter could achieve an output voltage higher than 14 V for a supply voltage that ranges from 2 V to 5 V. The converter delivers 1 mA even when the supply voltage is as low as 2 V.