Bi-directional integrated charge pumps

Abstract

A bi-directional switched-capacitor power converter that converts 1.8V to 4.5V from the low voltage (LV) port to the high voltage (HV) port and 4.5V back to 1.8V from the HV port to the LV port is proposed. Each port voltage can be regulated using technique of switching low dropout regulator when it serves as the output. The converter is designed using an AMS 0.6 /spl mu/m n-well process. Simulation results show that each output delivers a maximum load current of 100 mA with good line and load regulation. The efficiencies are 81% for the step-up case and 72% for the step-down case.