Analog Devices®3110 Supercapacitor Charger

Analog Devices' LTC3110 is a 2 A bi-directional buck-boost DC/DC regulator with capacitor charger and balancer. Its wide 0.1 V to 5.5 V capacitor / battery voltage and 1.8 V to 5.25 V system backup voltage ranges make it well-suited to a wide variety of backup applications using supercapacitors or batteries. A proprietary low noise switching algorithm optimizes efficiency with capacitor/battery voltages that are above, below, or equal to the system output voltage. The LTC3110 can autonomously transition from charge to backup mode or switch modes based on an external command. Pin-selectable Burst Mode^® operation reduces standby current and improves light-load efficiency, which, combined with a 1 μA shutdown current, make the LTC3110 ideally suited for backup applications. Additional features include voltage supervisors for direction control and end-of-charge, and a general purpose comparator with open-collector output for interfacing with a μC. The LTC3110 is available in thermally enhanced, low-profile 24-lead TSSOP and 4 mm × 4 mm QFN packages.

Features
VCAP operating range: 0.1 V to 5.5 V VSYS operating range: 1.71 V to 5.25 V Automatic switchover from charge to backup mode Programmable ±2% accurate charge input current limit from 125 mA to 2 A ±1% backup voltage accuracy Automatic backup capacitor balancing Fixed 1.2 MHz switching frequency		Burst Mode operation: 40 μA quiescent current Built-in programmable multipurpose comparator with open-collector output Open-collector outputs to indicate direction of operation and end of charge Thermally enhanced 24-TSSOP  and 4 mm × 4 mm 24-QFN packages
Applications
Supercapacitor backup converter and charger Battery backup converter and charger		Servers, RAID systems RF Systems with battery / capacitor backup