LTC3203-1, 500mA Output Current Low Noise Dual Mode Charge Pump

Circuit shows LTC3203 family are low noise, high efficiency regulating charge pumps that can supply up to 500mA of output current from a single 2.7V to 5.5V supply. The LTC3203-1 and LTC3203B-1 produce a selectable fixed 4.5V or 5V output