LTC4080X - 500mA Standalone Li-Ion Charger with Integrated 300mA Synchronous Buck


  • Complete Linear Battery Charger with Integrated  Buck Converter
  • Available in 10-lead, low profile (0.75 mm) 3mm × 3mm DFN and 10-lead MSE packages
    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 (Constant-Frequency Mode)
  • 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

LTC4080X Typical Application
LTC4080X Typical Application


The LTC4080X is a complete constant-current / constant-voltage linear battery charger for a single-cell 4.2V lithium-ion/polymer battery with an integrated 300mA synchronous buck converter. A 3mm × 3mm DFN package and low external component count make the LTC4080X especially suitable for portable applications. Furthermore, the LTC4080X 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 LTC4080X battery charger also includes automatic recharge and soft-start to limit inrush current. If trickle charging is desired, please see the LTC4080 datasheet.

The LTC4080X 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 LTC4080X is available in 10-lead, low profile (0.75 mm) 3mm × 3mm DFN and 10-lead MSE packages.

 Trickle ChargePackage
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
LTC4080XEDD#PBF 3x3 DFN-10 DD E 05-08-1699 Yes
LTC4080XEDD#TRPBF 3x3 DFN-10 DD E 05-08-1699 Yes
LTC4080XEMSE#PBF MS-10E MSE E 05-08-1664 Yes
LTC4080XEMSE#TRPBF MS-10E MSE E 05-08-1664 Yes

LTC4080X Package Drawing
LTC4080X 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
LTC4080XEDD#PBF 3x3 DFN-10 E $2.71 $1.90 Yes
LTC4080XEDD#TRPBF 3x3 DFN-10 E $1.96 Yes
LTC4080XEMSE#PBF MS-10E E $2.71 $1.90 Yes
LTC4080XEMSE#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.

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