Charge Pump DC to DC Voltage Converter
The TPS60403 is an unregulated charge pump voltage inverter IC from Texas instruments. It has a wide working voltage ranging from 1.6V to 5.5V. One interesting fact is that the TPS60403 requires only three 1uF capacitor to operate.
TC7660 Voltage Converter
The TC7660 is a Charge Pump DC-to-DC Voltage Converter.