LTC4110 Datasheet | Linear Technology

Battery Backup System Manager Features n plete Backup Battery Manager for Li-Ion/ Polymer, Lead Acid, Ni MH/Ni Cd Batteries and Super Capacitors n Charge and Discharge Battery with Voltages Above and Below the Input Supply Voltage n “No Heat” Battery Calibration Discharge Using System Load n Automatic Battery Backup with Input Supply Removal Using Power Path™ Control n Standalone for Li-Ion/Polymer, SLA, and Supercaps n Optional SMBus/I2C Support Allows Battery Capacity Calibration Operation with Host n Over- and Under-Battery Voltage Protection n Adjustable Battery Float Voltage n Precision Charge Voltage ±0.5% n Programmable Charge/Calibration Current Up to 3A with ±3% Accuracy n Optional Temperature Qualified Charging n Wide Backup Battery Supply Range: 2.7V to 19V n Wide Input Supply Range: 4.5V to 19V n 38-Lead (5mm × 7mm) QFN Package APPLICATIONS n Backup Battery Systems n Server Memory Backup n Medical Equipment n High Reliability Systems DESCRIPTION The LTC®4110 is a plete single chip, high efficiency, flyback 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 municate over an SMBus. During calibration the flyback charger is used in reverse to discharge the battery with a programmable constant current into the system load eliminating heat generation. Three status outputs can be individually reconfigured over the SMBus to bee GPIOs. User programmable overdischarge protection is provided. The SHDN pin isolates the battery to support shipping the product with a charged battery installed. Multiple LTC4110s can be bined to form a redundant battery backup system or increase the number of battery packs to achieve longer backup run...