DESCRIPTION
The LTC® 4054 is a complete constant-current/constant voltage linear charger for single cell lithium-ion batteries. Its ThinSOT package and low external component count make the LTC4054 ideally suited for portable applications. Furthermore, the LTC4054 is specifically designed to work within USB power specifications.

FEATURES
■ Programmable Charge Current Up to 800mA
■ No MOSFET, Sense Resistor or Blocking Diode Required
■ Complete Linear Charger in ThinSOT^TM Package for Single Cell Lithium-Ion Batteries
■ Constant-Current/Constant-Voltage Operation with Thermal Regulation* to Maximize Charge Rate Without Risk of Overheating
■ Charges Single Cell Li-Ion Batteries Directly from USB Port
■ Preset 4.2V Charge Voltage with ±1% Accuracy
■ Charge Current Monitor Output for Gas Gauging*
■ Automatic Recharge
■ Charge Status Output Pin
■ C/10 Charge Termination
■ 25µA Supply Current in Shutdown
■ 2.9V Trickle Charge Threshold (LTC4054)
■ Available Without Trickle Charge (LTC4054X)
■ Soft-Start Limits Inrush Current
■ Available in 5-Lead SOT-23 Package

APPLICATION
■ Cellular Telephones, PDAs, MP3 Players
■ Charging Docks and Cradles
■ Bluetooth Applications