LTC4080 - 500mA Standalone Li-Ion Charger with Integrated 300mA Synchronous Buck


  • Complete Linear Battery Charger with Integrated Buck Converter

Battery Charger:

  • Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charge Rate Without Risk of Overheating
  • Internal 4.5 Hour Safety Timer for Termination
  • Charge Current Programmable Up to 500mA with 5% Accuracy
  • C/10 Charge Current Detection Output
  • 5µA Supply Current in Shutdown Mode

Switching Regulator:

  • High Efficiency Synchronous Buck Converter
  • 300mA Output Current
  • 2.7V to 4.5V Input Range (Powered from BAT Pin)
  • 0.8V to VBAT Output Range
  • MODE Pin Selects Fixed (2.25MHz) Constant-Frequency
  • PWM Mode or Low ICC (23µA) Burst Mode®  Operation
  • 2µA BAT Current in Shutdown Mode

Typical Application

LTC4080 Typical Application
LTC4080 Typical Application


The LTC®4080 is a complete constant-current/constant-voltage linear battery charger for a single-cell 4.2V lithium-ion battery with an integrated 300mA synchronous buck converter. The small packages and low external component count make the LTC4080 especially suitable for portable applications. Furthermore, LTC4080 is specifically designed to work within USB power specifications.

The CHRG pin indicates when charge current has dropped to ten percent of its programmed value (C/10). An internal 4.5-hour timer terminates the charge cycle. The full-featured LTC4080 battery charger also includes trickle charge, automatic recharge and soft-start (to limit inrush current).

The LTC4080 integrates a synchronous buck converter that is powered from the BAT pin. It has an adjustable output voltage and can deliver up to 300mA of load current. The buck converter also features low current high-efficiency Burst Mode operation that can be selected by the MODE pin.

The LTC4080 is available in 10-lead, low profile (0.75 mm) 3mm × 3mm DFN and MSOP Exposed Pad packages.

  Trickle Charge Package
LTC4080 Yes DFN-10
LTC4080X No DFN-10, MS-10


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
LTC4080EDD#PBF 3x3 DFN-10 DD E 05-08-1699 Yes
LTC4080EDD#TRPBF 3x3 DFN-10 DD E 05-08-1699 Yes
LTC4080EMSE#PBF MS-10E MSE E 05-08-1664 Yes
LTC4080EMSE#TRPBF MS-10E MSE E 05-08-1664 Yes

LTC4080 Package Drawing
LTC4080 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
LTC4080EDD#PBF 3x3 DFN-10 E $2.71 $1.90 Yes
LTC4080EDD#TRPBF 3x3 DFN-10 E $1.96 Yes
LTC4080EMSE#PBF MS-10E E $2.71 $1.90 Yes
LTC4080EMSE#TRPBF MS-10E E $1.96 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
DC920A LTC4080EDD Demo Board $100.00
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Click here to view our complete list of demo boards


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Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

  • LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
  • LTpowerCAD - A complete power supply selection, synthesis and design tool
  • LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
  • PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
  • Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
  • LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
  • And More!

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