A New Switching Scheme For High-Voltage Switched Capacitor DC-DC Converter

Abstract

In this paper a new double switch bootstrapping (DSB) scheme for high voltage switched capacitor DC-DC converter is presented. The circuit enables charge pump input voltages greater than the gate-oxide breakdown voltage for the switches. The DSB scheme is implemented in two high-voltage linear charge-pumps for positive and negative output voltages of up 72V and down to -36V, a maximum input voltage of 9V, a load current of 300µA for an efficiency of 34.8% at 2.2 MHz switching frequency. The experimental testchip is realized using a high-voltage 0.18µm SOI technology in 6.54 mm2.