Features and Benefits

  • Seamless Transition Between Input Power Sources:
    Li-Ion Battery, USB and 5V Wall Adapter
  • Low Loss (50mΩ) Ideal Diode Path from BAT to OUT
  • Programmable Charge Current Detection (CHRG)
  • Load Dependent Charging Guarantees USB Input Current Compliance
  • Analog Gas Gauge Function
  • Charges Single Cell Li-Ion Batteries Directly from USB Port
  • Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charging Rate Without Risk of Overheating*
  • Selectable 100% or 20% Current Limit (e.g., 500mA/100mA)
  • Termination Timer Adapts to Actual Charge Current
  • Preset 4.2V Charge Voltage with 0.8% Accuracy (4.1V for LTC4066-1)
  • NTC Thermistor Input for Temperature Qualified Charging
  • Thin Profile (0.75mm) 24-Lead 4mm x 4mm QFN Package
  • Ultrathin Profile (0.55mm) 24-Lead 4mm x 4mm UTQFN Package (LTC4066 Only)

Product Details

The LTC4066/LTC4066-1 are USB power managers and Li-Ion battery chargers designed to work in portable battery-powered applications. The parts control the total current used by the USB peripheral for operation and battery charging. The total input current can be limited to 100mA, 500mA or “unlimited” (i.e., above 2A). Battery charge current is automatically reduced such that the sum of the load current and the charge current does not exceed the programmed input current limit.

The LTC4066/LTC4066-1 include a standalone constant-current / constant-voltage linear charger for single cell Li-ion batteries. The float voltage applied to the battery is held to a tight 0.8% tolerance, and charge current is programmable using an external resistor to ground. A programmable end-of-charge status output (CHRG) indicates full charge. BAT pin charge and discharge currents can be monitored via an analog output (ISTAT). Total charge time is programmable by an external capacitor to ground. When the battery drops 100mV below the float voltage, automatic recharging of the battery occurs. Also featured is an NTC thermistor input used to monitor battery temperature while charging.

The LTC4066/LTC4066-1 are available in a 24-pin thin profile (0.75mm) 4mm x 4mm QFN package. The LTC4066 is also available in a 24-pin ultrathin profile (0.55mm) 4mm x 4mm UTQFN package.


  • Portable USB Devices
  • GPS, Cameras, Broadband Wireless Modems
  • Mulitple Input 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

LTC4066 Companion Parts

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Reference Materials

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.

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Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

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.