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  4. Battery Charger IC
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  6. LTC4009

Data Sheet
JP
User Guides
2 View All

Overview

Features and Benefits

  • General Purpose Battery Charger Controller
  • Efficient 550kHz Synchronous Buck PWM Topology
  • ±0.5% Output Float Voltage Accuracy
  • Programmable Charge Current: 4% Accuracy
  • Programmable AC Adapter Current Limit: 3% Accuracy
  • No Audible Noise with Ceramic Capacitors
  • Wide Input Voltage Range: 6V to 28V
  • Wide Output Voltage Range: 2V to 28V
  • Indicator Outputs for AC Adapter Present, Charging, C/10 Current Detection and Input Current Limiting
  • Analog Charge Current Monitor
  • Micropower Shutdown
  • Thermally Enhanced 20-Pin 4mm × 4mm × 0.75mm QFN Package

Product Details

The LTC4009 is a constant-current/constant-voltage battery charger controller. It uses a synchronous quasiconstant frequency PWM control architecture that will not generate audible noise with ceramic bulk capacitors. Charge current is set by the combination of external sense, input and programming resistors. With no built-in termination, the LTC4009 family charges a wide range of batteries under external control.

The LTC4009 features a fully adjustable output voltage, while the LTC4009-1 and LTC4009-2 can be pin-programmed for lithium-ion/polymer battery packs of 1-, 2-, 3- or 4-series cells. The LTC4009-1 provides output voltage of 4.1V/cell, and the LTC4009-2 is a 4.2V/cell version.

The device includes AC adapter input current limiting which maximizes the charge rate for a fixed input power level. An external sense resistor programs the input current limit, and the ICL status pin indicates when the battery charge current is being reduced as a result of AC adapter current limiting.

The CHRG status pin is active during all charging modes, including special indication for low charge current.

Applications

  • Notebook Computers
  • Portable Instruments
  • Battery Backup Systems

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Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Documentation & Resources

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  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (2)
  • Product Selector Card (1)
  • Application Notes (1)
  • Press Releases (1)
  • Technical Articles (1)
    • Document Type

    Tools & Simulations

    LTspice

    LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

    LTspice

    Models for the following parts are available in LTspice:

    LTC4009
    LTC4009-1
    LTC4009-2

    Product Recommendations

    LTC4009 Companion Parts

    Recommended µModule Regulator

    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
    LTC4009CUF#PBF Material Declaration Reliability Data 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
    LTC4009CUF#TRPBF Material Declaration Reliability Data 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
    LTC4009CUF-1#PBF Material Declaration Reliability Data 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
    LTC4009CUF-1#TRPBF Material Declaration Reliability Data 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
    LTC4009CUF-2#PBF Material Declaration Reliability Data 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
    LTC4009CUF-2#TRPBF Material Declaration Reliability Data 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
    LTC4009IUF#PBF Material Declaration Reliability Data 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
    LTC4009IUF#TRPBF Material Declaration Reliability Data 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
    LTC4009IUF-1#PBF Material Declaration Reliability Data 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
    LTC4009IUF-1#TRPBF Material Declaration Reliability Data 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
    LTC4009IUF-2#PBF Material Declaration Reliability Data 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
    LTC4009IUF-2#TRPBF Material Declaration Reliability Data 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
    Wafer Fabrication Data R480 Reliability Data

    PCN-PDN Information

    Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.

    Select Model for PCN Information
    • LTC4009CUF#PBF Production
    • LTC4009CUF#TRPBF Production
    • LTC4009CUF-1#PBF Production
    • LTC4009CUF-1#TRPBF Production
    • LTC4009CUF-2#PBF Production
    • LTC4009CUF-2#TRPBF Production
    • LTC4009IUF#PBF Production
    • LTC4009IUF#TRPBF Production
    • LTC4009IUF-1#PBF Production
    • LTC4009IUF-1#TRPBF Production
    • LTC4009IUF-2#PBF Production
    • LTC4009IUF-2#TRPBF Production

    Support & Discussions

    LTC4009 Discussions

    RE: LTC4009 RPROG when RIN=o
    All LTC4009 Discussions
    LTC4009 Contact ADI Technical Support »
    LTC4009 Ask your question »
    LTC4009 Contact ADI Technical Support » LTC4009 Ask your question »

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