DESCRIPTION
The LTC®4061-4.4 is a full-featured, flexible, standalone linear charger for single-cell 4.375V Lithium-Ion batteries. It is capable of operating within USB power specifications.
Both programmable time and programmable current based termination schemes are available. Furthermore, the ⎯C⎯H⎯R⎯G open-drain status pin can be programmed to indicate the battery charge state according to the needs of the application. Additional safety features designed to maximize battery lifetime and reliability include NTC battery temperature sensing and the SmartStart charging algorithm.

FEATURES
■ Charge Current Programmable up to 1A
■ Charges Single Cell Li-Ion Batteries Directly from
   USB Port
■ Preset 4.375V Float Voltage with ±0.4% Accuracy
■ Thermistor Input for Temperature Qualified
   Charging
■ Input Supply Present Logic Output
■ Thermal Regulation Maximizes Charge Rate
   Without Risk of Overheating*
■ Programmable Charge Current Detection/
   Termination
■ Programmable Charge Termination Timer
■ Smart Pulsing Error Feature
■ SmartStartTM Prolongs Battery Life
■ 20µA Charger Quiescent Current in Shutdown
■ Available in a Low Profi le (0.75mm) 10-Lead
   (3mm × 3mm) DFN Package

APPLICATIONS
■ Handheld Computers
■ Portable MP3 Players
■ Digital Cameras