ADI LTC3226EUD#PBF

The LTC3226 is a 2-cell series supercapacitor charger with a backup PowerPath controller. 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 of 2.5V to 5.3V. The charger input current limit is programmable by an external resistor at up to 315mA. The internal backup LDO is powered from the supercapacitors and provides up to 2A peak output current with an adjustable output voltage. When the input supply falls below the power-fail threshold, the LTC3226 automatically enters a backup state in which the supercapacitors power the output through the LDO. The input supply power-fail voltage level is programmed by an external resistor divider. Low input noise, low quiescent current and a compact footprint make the LTC3226 ideally suited for small, battery-powered applications. Internal current limit and thermal shutdown circuitry allow the device to survive a continuous short-circuit from the PROG or CPO pins to ground.

• 1x/2x Multimode Charge Pump Supercapacitor Charger
• Automatic Cell Balancing
• Ideal Diode Main PowerPath Controller (VIN to VOUT)
• Internal 2A LDO Backup Supply (CPO to VOUT)
• Automatic Main/Backup Switchover
• Input Voltage Range: 2.5V to 5.5V
• Programmable SCAP Charge Voltage
• Programmable Input Current Limit (315mA Max)
• No Load IVIN = 55μA (Typical)
• Low Profile, 16-Lead 3mm × 3mm QFN Package

• Smart Power Meters
• Battery-Powered Industrial/Medical Equipment
• 3.3V Solid-State Drives
• Industrial Alarms
• Data Backup Supplies
• Battery Hold-Up Supplies