DC1735A

DC1735A demonstration circuit is a 2-cell supercap charger with a backup PowerPath™ controller, featuring the LTC®3226. It includes a charge-pump supercapacitor charger with programmable output voltage, a low dropout regulator and a power-fail comparator for switching between normal and backup modes. The constant-input current supercapacitor charger is designed to charge two supercapacitors in series to a resistor programmable output voltage from a 2.5V to 5.3V input supply. The charger input current limit is programmable by an external resistor up to 315mA. The internal backup LDO is powered from supercapacitors and provides up to 2A peak output current with an adjustable output voltage. When the input supply falls below the resistor programmable power-fail threshold, the LTC3226 automatically enters backup state in which the supercapacitors power the output through the LDO. The LTC3226 is available in 16-lead, 3mm x 3mm QFN surface mount package with an exposed pad.

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