Key features and benefits of the LTC4425 include the automatic cell balancing feature that maintains equal voltages across both cells, eliminating the need for balancing resistors while protecting each supercapacitor from overvoltage damage and minimizing current drain on the capacitors. The ideal diode operates even with regulated V_OUT, preventing reverse conduction into V_IN. The protection shunts reduce charge current if the supercapacitor voltage gets too high. Current and thermal limiting reduce charge current in cases of excessive temperature. The IC operates with a very low 20µA quiescent current when the output voltage is in regulation and draws only 2µA in shutdown from either V_IN or V_OUT, whichever is higher, saving battery run time.