The device charges a supercapacitor in two phases: constant current and constant voltage. Power dissipation in the IC is greatest in fast charge with a lower supercapacitor voltage. If the IC temperature reaches T_REG, the IC enters thermal regulation and reduces the charge current as needed to keep the temperature from rising any further. As the supercapacitor approaches the regulation voltage, the current tapers down to 0 mA. There is no current termination threshold as seen in Li-Ion chargers.