LTC4053-4.2 - USB Compatible Lithium-Ion Battery Charger with Thermal Regulation


  • Charges Single-Cell Li-Ion Batteries Directly from USB Port
  • Thermal Regulation Maximizes Charging Rate without Risk of Overheating*
  • Programmable Charge Current with 7% Accuracy
  • Low Dropout Operation
  • No External MOSFET, Sense Resistor or Blocking Diode Required
  • Programmable Charge Termination Timer
  • Preset Charge Voltage with ±1% Accuracy
  • C/10 Charge Current Detection Output
  • AC Present Logic Output
  • 25µA Supply Current in Shutdown Mode
  • Automatic Recharge
  • Tiny Thermally Enhanced 10-Pin MSOP Package
  • Charge Current Monitor Useful for Gas Gauging*
  • Thermistor Input for Temperature Qualified Charging

Typical Application

LTC4053-4.2 Typical Application
LTC4053-4.2 Typical Application


The LTC4053 is a standalone linear charger for lithiumion batteries that can be powered directly from a USB port. The IC contains an on-chip power MOSFET and eliminates the need for an external sense resistor and blocking diode. Thermal regulation automatically adjusts charge current to limit die temperature during high power or high ambient temperature conditions. This feature protects the end product and the LTC4053 from thermal stress while the IC charges the battery at maximum rate without interruption.

The charge current and charge time can be set externally with a single resistor and capacitor, respectively. When the input supply (wall adapter or USB supply) is removed, the LTC4053 automatically enters a low current sleep mode, dropping the battery drain current to less than 5µA.

The LTC4053 also includes NTC temperature sensing, C/10 detection circuitry, AC present logic, low battery charge conditioning (trickle charging) and shutdown (25µA supply current).

The LTC4053 is available in a 10-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
LTC4053EDD-4.2#PBF 3x3 DFN-10 DD E 05-08-1699 Yes
LTC4053EDD-4.2#TRPBF 3x3 DFN-10 DD E 05-08-1699 Yes
LTC4053EMSE-4.2#PBF MS-10E MSE E 05-08-1664 Yes
LTC4053EMSE-4.2#TRPBF MS-10E MSE E 05-08-1664 Yes

LTC4053-4.2 Package Drawing
LTC4053-4.2 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
LTC4053EDD-4.2#PBF 3x3 DFN-10 E $2.68 $1.90 Yes
LTC4053EDD-4.2#TRPBF 3x3 DFN-10 E $2.00 Yes
LTC4053EMSE-4.2#PBF MS-10E E $2.68 $1.90 Yes
LTC4053EMSE-4.2#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
DC567A LTC4053EMSE-4.2 LTC4410ES6 | USB Compliant Battery Charger, 4.25 to 6Vin, Jumper selectable, 100mA or 500mA $100.00
DC705A LTC4053EMSE-4.2 | Li-Ion Battery Charger, Vin = 4.25V to 6.3V, Bat = 4.2V @ 0.5A / 1A $100.00
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Click here to view our complete list of demo boards


  • Cellular Telephones
  • Handheld Computers
  • Charging Docks and Cradles
  • MP3 Players
  • Digital Cameras

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