ADI LTC4001EUF-1#TRPBF

The LTC 4001 - 1 is a 2A Li - Ion battery charger intended for 5V wall adapters. It utilizes a 1.5MHz synchronous buck converter topology to reduce power dissipation during charging. Low power dissipation, an internal MOSFET and sense resistor allow a physically small charger that can be embedded in a wide range of handheld applications. The LTC4001 - 1 includes complete charge termination circuitry, automatic recharge and a ±1% 4.1V float voltage. Input short - circuit protection is included so no blocking diode is required.

This 4.1V version of the standard LTC4001 is intended for applications which will be operated or stored above approximately 60°C. Under these conditions, the reduced float voltage will trade - off initial cell capacity for the benefit of increased capacity retention over the life of the battery. A reduced float voltage also minimizes swelling in prismatic and polymer cells, and avoids open CID (pressure fuse) in cylindrical cells.

Battery charge current, charge timeout and end - of - charge indication parameters are set with external components. Additional features include shorted cell detection, temperature qualified charging and overvoltage protection. The LTC4001 - 1 is available in a low profile (0.75mm) 16 - lead (4mm×4mm) QFN package.

• Low Power Dissipation
• 2A Maximum Charge Current
• No External MOSFETs, Sense Resistor or Blocking Diode Required
• Remote Sensing at Battery Terminals
• Programmable Charge Termination Timer
• Preset 4.1V Float Voltage with ±0.5% Accuracy
• 4.1V Float Voltage Improves Battery Life and High Temperature Safety Margin
• Programmable Charge Current Detection/Termination
• Automatic Recharge
• Thermistor Input for Temperature Qualified Charging
• Compatible with Current Limited Wall Adapters
• Low Profile 16 - Lead (4mm × 4mm) QFN Package

• Handheld Battery - Powered Devices
• Handheld Computers
• Charging Docks and Cradles
• Digital Cameras
• Smart Phones