In summary, Analog Devices LTC3225 and LTC3225-1 is a charge pump doubler with current limiting and automatic cell balancing that employs a low-noise charge-pump architecture to charge two supercapacitors in series to a fixed output voltage. The charge current output is resistor programmable up to 150mA while the device’s automatic cell balancing feature maintains equal voltages on both cells. This is done without requiring balancing resistors, thereby protecting each SuperCapacitor from overvoltage damage caused by mismatches in cell capacitance or leakage while minimizing current drain on the capacitors. Additionally, the LTC3225 and LTC3225-1 feature an ultra-low quiescent current of 20µA in standby mode, a low drain current of less than 1µA from the SuperCapacitors when the input supply is removed, and are housed in a compact 2mm by 3mm DFN 10-lead package.