1. Products
  2. Power Management
  3. Battery Management
  4. Battery Charger IC
  5. Linear Battery Chargers
  6. LTC4050


Features and Benefits

  • Complete Standalone Linear Charger Controller for 1-Cell Lithium-Ion Batteries
  • Thermistor Interface for Battery Temperature Sensing
  • Preset Charge Voltage with ±1% Accuracy
  • Programmable Charge Current
  • C/10 Charge Current Detection Output
  • Programmable Charge Termination Timer
  • Input Supply (Wall Adapter) Detection Output
  • 4.5V to 10V Input Voltage Range
  • Automatic Sleep Mode When Input Supply is Removed (Only 5µA Battery Drain)
  • Automatic Trickle Charging of Low Voltage Cells
  • Automatic Battery Recharge
  • Battery Insertion Detection
  • Space Saving 10-Pin MSOP Package

Product Details

The LTC4050-4.1/LTC4050-4.2 are complete standalone constant-current/constant-voltage linear charge controllers for lithium-ion (Li-Ion) batteries. Charge current is programmable and final float voltage has ±1% accuracy.

When the input supply is removed, the LTC4050 automatically enters a low quiescent current sleep mode, dropping the battery drain current to 5µA. An internal comparator detects the near-end-of-charge (C/10) condition while a programmable timer, using an external capacitor, sets the total charge time. Fully discharged cells are automatically trickle charged at 10% of the programmed current until cell voltage exceeds 2.49V. The thermistor interface suspends charging if the cell temperature is outside of a 0°C to 50°C temperature window.

The LTC4050 begins a new charge cycle when a discharged battery is connected to the charger or when the input power is applied. In addition, a new charge cycle is automatically started if the battery remains connected to the charger and the cell voltage drops below 3.88V for 4.1V cells or below 3.98V for 4.2V cells.

The LTC4050 is available in the 10-pin MSOP package.


  • Cellular Phones
  • Handheld Computers
  • Charging Docks and Cradles

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 (2)

Product Recommendations

LTC4050 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
LTC4050EMS-4.1#PBF Material Declaration Reliability Data 10-Lead MSOP
LTC4050EMS-4.1#TRPBF Material Declaration Reliability Data 10-Lead MSOP
LTC4050EMS-4.2#PBF Material Declaration Reliability Data 10-Lead MSOP
LTC4050EMS-4.2#TRPBF Material Declaration Reliability Data 10-Lead MSOP
Wafer Fabrication Data R449 Reliability Data

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Evaluation Boards

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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.