Features and Benefits

  • Very Low Power Dissipation: 350mW at 1A
  • Complete Standalone Pulse Charger for 1-Cell Lithium-Ion Batteries
  • Requires No Microcontroller, MOSFET or Blocking Diode
  • Sense Resistor Limits Maximum Current for Safety
  • Programmable Charge Termination Timer for
    Maximum Capacity Charging
  • ±1% Float Voltage Accuracy
  • Near End-of-Charge (C/10) Detection Output
  • AC Wall Adapter Present Output
  • Low Battery Drain when Input Supply Is Removed
  • Automatic Trickle Charge for Low Battery
  • Automatic Battery Refresh
  • Thermal Shutdown Protection
  • Tiny Thermally Enhanced MSOP Package

Product Details

The LTC4052 is a complete standalone pulse charger with integrated MOSFET for 1-cell lithium-ion batteries.

An external sense resistor provides overcurrent limiting as a safety precaution against a user connecting a wall adapter with the incorrect or no current limit. The internal MOSFET prevents reverse battery current from flowing if the input voltage is shorted to ground, eliminating the need for a blocking diode.

As the battery accepts charge and approaches the programmed float voltage, the internal MOSFET begins switching off and on with the duty cycle gradually decreasing as the battery approaches a fully charged condition. A programmable timer terminates the charge cycle. The near end-of-charge C/10 condition is indicated at the CHRG pin when the average charge current falls to one tenth of the wall adapter current. Removing the input voltage puts the LTC4052 into a sleep mode, dropping the battery current drain to less than 1µA.

The LTC4052 is available in a tiny 8-pin thermally enhanced MSOP package.


  • Handheld Computers
  • Cellular Telephones
  • Cradle Chargers

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)

Product Recommendations

LTC4052-4.2 Companion Parts

Recommended Related Parts

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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.

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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.