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  2. Power Management
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  4. Battery Charger IC
  5. Switching Battery Chargers
  6. LTC4040


Alternative Parts

Overview

Features and Benefits

  • Step-Up Backup Supply and Step-Down Battery Charger
  • 6.5A Switches for 2.5A Backup from 3.2V Battery
  • Input Current Limit Prioritizes Load Over Charge Current
  • Input Disconnect Switch Isolates Input During Backup
  • Automatic Seamless Switch-Over to Backup Mode
  • Input Power Loss Indicator
  • System Power Loss Indicator
  • Pin Selectable Battery: Li-Ion (3.95V/4.0V/4.05V/4.1V) or LiFePO4 (3.45V/3.5V/3.55V/3.6V)
  • Optional OVP Circuitry Protects Device to >60V
  • Constant Frequency Operation
  • Low Profile (0.75mm) 24-Lead 4mm × 5mm QFN Package

Product Details

The LTC4040 is a complete 3.5V to 5.5V supply rail battery backup system. It contains a high current step-up DC/DC regulator to back up the supply from a single-cell Li-Ion or LiFePO4 battery. When external power is available, the step-up regulator operates in reverse as a step-down battery charger.

The LTC4040’s adjustable input current limit function reduces charge current to protect the main supply from overload while an external disconnect switch isolates the external supply during backup. When the input supply drops below the adjustable PFI threshold, the 2.5A boost regulator delivers power from the battery to the system output.

An optional input overvoltage protection (OVP) circuit protects the LTC4040 from high voltage damage at the VIN pin. One logic input selects either the Li-Ion or the LiFePO4 battery option, and two other logic inputs program the battery charge voltage to one of four levels suitable for backup applications. The LTC4040 is available in a low profile (0.75mm) 24-Lead 4mm × 5mm QFN package.

Applications

  • Fleet and Asset Tracking
  • Automotive GPS Data Loggers
  • Automotive Telematics Systems
  • Toll Collection Systems
  • Security Systems
  • USB Powered Devices

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (2)

Product Recommendations

LTC4040 Companion Parts

Recommended Related Parts

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LTC4040EUFD#PBF Material Declaration Reliability Data 24-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
LTC4040EUFD#TRPBF Material Declaration Reliability Data 24-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
LTC4040IUFD#PBF Material Declaration Reliability Data 24-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
LTC4040IUFD#TRPBF Material Declaration Reliability Data 24-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
Wafer Fabrication Data R457 Reliability Data

Sample & Buy


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Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.