A Switched Capacitor DC-DC Converter For Ultra-low-power Applications

A switched capacitor DC-DC converter that could deliver scalable output voltages was designed in National Semiconductor's 0.18µm CMOS process. The converter was able to deliver load voltages from 0.3V - 1.1V and was powered by a 1.2V battery. It employs on-chip charge transfer capacitors and reduces the loss due to bottom-plate parasitics by employing a method known as divide-by-3 switching.