LTC4052-4.2 - Lithium-Ion Battery Pulse Charger with Overcurrent Protection


  • 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

Typical Application

LTC4052-4.2 Typical Application
LTC4052-4.2 Typical Application


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.


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
LTC4052EMS8E-4.2#PBF MS-8E MS8E E 05-08-1662 Yes
LTC4052EMS8E-4.2#TRPBF MS-8E MS8E E 05-08-1662 Yes

LTC4052-4.2 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
LTC4052EMS8E-4.2#PBF MS-8E E $2.68 $1.85 Yes
LTC4052EMS8E-4.2#TRPBF MS-8E E $1.91 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
DC531A-A LTC4052EMS8E-4.2 | Li-Ion Battery Pulse Charger, Vin= 4.5V-10V, 1A Limit, Vbat=4.2V $100.00
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