Datasheet LTC4110 (Analog Devices)

LTC4110 Battery Backup System Manager
FEATURES DESCRIPTION
n
Complete Backup Battery Manager for Li-Ion/
The LTC®4110 is a complete single chip, high effi ciency,
Polymer, Lead Acid, NiMH/NiCd Batteries and
fl yback battery charge and discharge manager with auto-
Super Capacitors
matic switchover between the input supply and the backup n
Charge and Discharge Battery with Voltages Above
battery or super capacitor. The IC provides four modes of
and Below the Input Supply Voltage
operation: battery backup, battery charge, battery calibra- n
“No Heat” Battery Calibration Discharge Using
tion and shutdown. Battery backup and battery charge are
System Load
automatic standalone modes, while the optional calibration n
Automatic Battery Backup with Input Supply
mode requires a CPU host to communicate over an SMBus.
Removal Using PowerPath™ Control
During calibration the fl yback charger is used in reverse n
Standalone for Li-Ion/Polymer, SLA, and Supercaps
to discharge the battery with a programmable constant n
Optional SMBus/I2C Support Allows Battery
current into the system load eliminating heat generation.
Capacity Calibration Operation with Host
Three status outputs can be individually reconfi gured over n
Over- and Under-Battery Voltage Protection
the SMBus to become GPIOs. User programmable over- n
Adjustable Battery Float Voltage
discharge protection is provided. The SHDN pin isolates n Precision Charge Voltage ±0.5% the battery to support shipping the product with a charged n Programmable Charge/Calibration Current Up to battery installed. 3A with ±3% Accuracy Multiple LTC4110s can be combined to form a redundant n Optional Temperature Qualifi ed Charging battery backup system or increase the number of battery n Wide Backup Battery Supply Range: 2.7V to 19V packs to achieve longer backup run times. n Wide Input Supply Range: 4.5V to 19V n 38-Lead (5mm × 7mm) QFN Package The LTC4110 is available in a low profi le (0.75mm), 38-pin 5mm × 7mm QFN package. The QFN features an exposed
APPLICATIONS
metal die mount pad for optimum thermal performance. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. PowerPath n Backup Battery Systems is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. n Server Memory Backup n Medical Equipment n High Reliability Systems
TYPICAL APPLICATION Battery Backup System Manager Server Backup System (In Backup Mode)
SYSTEM LOAD BACKUP LOAD (DCOUT) CURRENT FLOW SYSTEM LOAD (DC/DC, ETC.) DCIN 0V LTC4110 BATTERY BACKUP LOAD OFF ON ON BACKUP (MEMORY, ETC.) SYSTEM MANAGER CURRENT FLOW BATTERY HOST CPU BATTERY INID BATID I2C BUS UVLO LTC4110 CHGFET DCDIV SET POINT 4110 TA01b DCHFET 4110 F01 4110fb 1