LTC4110 - Battery Backup System Manager


  • 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 Qualified Charging
  • Wide Backup Battery Supply Range: 2.7V to 19V
  • Wide Input Supply Range: 4.5V to 19V
  • 38-Lead (5mm × 7mm) QFN Package

Typical Application

LTC4110 Typical Application
LTC4110 Typical Application


The LTC4110 is a complete 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 communicate 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 become GPIOs. User programmable over-discharge protection is provided. The SHDN pin isolates the battery to support shipping the product with a charged battery installed.

Multiple LTC4110s can be combined to form a redundant battery backup system or increase the number of battery packs to achieve longer backup run times.

The LTC4110 is available in a low profile (0.75mm), 38-pin 5mm × 7mm QFN package. The QFN features an exposed metal die mount pad for optimum thermal performance.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTC4110EUHF#PBF 5x7 QFN-38 UHF E 05-08-1701 Yes
LTC4110EUHF#TRPBF 5x7 QFN-38 UHF E 05-08-1701 Yes

LTC4110 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LTC4110EUHF#PBF 5x7 QFN-38 E $13.22 $9.25 Yes
LTC4110EUHF#TRPBF 5x7 QFN-38 E $9.31 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1259A LTC4110EUHF Demo Board | Multi-Chemistry Flyback Battery Backup System Charger/Manager $250.00
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Companion Boards

Part Number Description Price Documentation
DC1223A-B USB to SM-Bus/SPI Interface with Monitor $400.00
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Click here to view our complete list of demo boards


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