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LTC4001-1 - 2A Synchronous Buck Li-Ion Charger

The LTC4001-1 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 x 4mm) QFN package.

Features 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 x 4mm) QFN Package Typical Application

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

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