1. Products
  2. Power Management
  3. Battery Management
  4. Battery Charger IC
  5. Linear Battery Chargers
  6. LTC1734


Features and Benefits

  • Low Profile (1mm) ThinSOT
  • No Blocking Diode Required
  • No Sense Resistor Required
  • 1% Accurate Preset Voltages: 4.1V or 4.2V
  • Charge Current Monitor Output
    for Charge Termination
  • Programmable Charge Current: 200mA to 700mA
  • Automatic Sleep Mode with Input Supply Removal
  • Manual Shutdown
  • Negligible Battery Drain Current in Shutdown
  • Undervoltage Lockout
  • Self Protection for Overcurrent/Overtemperature

Product Details

The LTC1734 is a low cost, single cell, constant-current/constant-voltage Li-Ion battery charger controller. When combined with a few external components, the SOT-23 package forms a very small, low cost charger for single cell lithium-ion batteries.

The LTC1734 is available in 4.1V and 4.2V versions with 1% accuracy. Constant current is programmed using a single external resistor between the PROG pin and ground. Manual shutdown is accomplished by floating the program resistor while removing input power automatically puts the LT1734 into sleep mode. Both the shutdown and sleep modes drain near zero current from battery.

Charge current can be monitored via the voltage on the PROG pin allowing a microcontroller or ADC to read the current and determine when to terminate the charge cycle. The output driver is both current limited and thermally protected to prevent the LTC1734 from operating outside of safe limits. No external blocking diode is required.

The LTC1734 can also function as a general purpose current source or as a current source for charging nickel-cadmium (NiCd) and nickel-metal-hydride (NiMH) batteries using external termination.

Charge Current Vfloat
LTC1734 180mA to 700mA 4.1V or 4.2V
LTC1734L 50mA to 180mA 4.2V


  • Cellular Telephones
  • Handheld Computers
  • Digital Cameras
  • Charging Docks and Cradles
  • Low Cost and Small Size Chargers
  • Programmable Current Source

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)

Tools & Simulations


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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
LTC1734ES6-4.1#TRMPBF Material Declaration Reliability Data 6-Lead TSOT-23
LTC1734ES6-4.1#TRPBF Material Declaration Reliability Data 6-Lead TSOT-23
LTC1734ES6-4.2#TRMPBF Material Declaration Reliability Data 6-Lead TSOT-23
LTC1734ES6-4.2#TRPBF Material Declaration Reliability Data 6-Lead TSOT-23
Wafer Fabrication Data R402 Reliability Data

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Lead Times

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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.