The LTC4425 is a dedicated IC for charging supercapacitors. It incorporates an ideal diode, which provides efficient supercapacitor charging and offers high-precision undervoltage lockout (UVLO) and short-circuit protection.
The LTC4425 is an integrated circuit designed to charge stacked supercapacitors and provide a regulated output voltage for system loads. It features two modes of operation: Normal mode, which functions as an ideal diode with current limiting, and LDO mode, which acts as a voltage regulator supplying programmed current to the load and capacitor.
The device includes specific design features such as voltage clamps on stacked supercapacitors (selectable at 2.45V or 2.70V) to prevent over-voltage damage, a leakage balancer to correct imbalances between capacitors in a stack, and a PFO output that monitors input faults or low output conditions to switch loads appropriately.
The device limits its die temperature to remain below 105°C.
The maximum sink or source current for balancing is around 1mA.