DESCRIPTION
The LTC®4110 is a complete single chip, high efficiency, fl yback battery charge and discharge manager with automatic switchover between the input supply and the backup battery or super capacitor. The IC provides four modes of operation: battery backup, battery charge, battery calibration and shutdown. Battery backup and battery charge are automatic standalone modes, while the optional calibration mode requires a CPU host to communicate over an SMBus. During calibration the fl yback charger is used in reverse to discharge the battery with a programmable constant current into the system load eliminating heat generation.

FEATURES
■ Complete Backup Battery Manager for Li-Ion/
   Polymer, Lead Acid, NiMH/NiCd Batteries and
   Super Capacitors
■ Charge and Discharge Battery with Voltages Above
   and Below the Input Supply Voltage
■ “No Heat” Battery Calibration Discharge Using
   System Load
■ Automatic Battery Backup with Input Supply
   Removal Using PowerPath™ Control
■ Standalone for Li-Ion/Polymer, SLA, and Supercaps
■ Optional SMBus/I2C Support Allows Battery
   Capacity Calibration Operation with Host
■ Over- and Under-Battery Voltage Protection
■ Adjustable Battery Float Voltage
■ Precision Charge Voltage ±0.5%
■ Programmable Charge/Calibration Current Up to
   3A with ±3% Accuracy
■ Optional Temperature Qualifi ed Charging
■ Wide Backup Battery Supply Range: 2.7V to 19V
■ Wide Input Supply Range: 4.5V to 19V
■ 38-Lead (5mm × 7mm) QFN Package

APPLICATIONS
■ Backup Battery Systems
■ Server Memory Backup
■ Medical Equipment
■ High Reliability Systems