The LTC3128 is Linear Technology’s highest charge current switch mode supercapacitor charger to date, ideal for safely charging and protecting large capacitors in backup power systems. The device employs a buck-boost architecture to charge 1 or 2 supercapacitors in series, to a resistor-divider adjustable voltage with high efficiency. Key features include 3A programmable charge current, both buck mode and boost mode charging capability, automatic cell balancing, supercap voltage regulation and peak voltage clamping, low quiescent current, status indicators, and numerous protection features.