A high current driving charge pump with current regulation method

This paper proposes a charge pump having a high driving capability for driving more than a load of 8 mA with a 5 V regulated output voltage. The output of the charge pump generates 5 V without any damages to the oxide using protection circuits, even though it uses 3 V MOS transistors. The prototype chip designed using 0.13 μm CMOS process provides the range of a 0∼25 mA load current and generates a well regulated 5 V output voltage with a flying capacitor of 500 nF and clock frequency of 500 KHz. The chip area is 0.21 mm². The power efficiency is as much as 86% at 3.0 V supply.