DESCRIPTION

The LTC®4069 is a complete constant-current/constant-voltage linear charger for single-cell lithium-ion batteries. The 2mm × 2mm DFN package and low external component count make the LTC4069 especially well-suited for portable applications. Furthermore, LTC4069 is specifically designed to work within USB power specifications.

FEATURES

■ Complete Linear Charger in 2mm × 2mm DFN Package

■ C/10 Charge Current Detection Output

■ Timer Charge Termination

■ Charge Current Programmable Up to 750mA with 5 Accuracy

■ No External MOSFET, Sense Resistor or Blocking Diode Required

■ NTC Thermistor Input for Temperature Qualified Charging

■ Preset 4.2V Float Voltage with 0.6 Accuracy

■ Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charge Rate Without Risk of Overheating

■ Charge Current Monitor Output for Gas Gauging

■ Automatic Recharge

■ Charges Single-Cell Li-Ion Batteries Directly from USB Port

■ 20µA Supply Current in Shutdown Mode

■ Soft-Start Limits Inrush Current

■ Tiny 6-Lead (2mm × 2mm) DFN Package

APPLICATIONS

■ Wireless PDAs

■ Cellular Phones

■ Portable Electronics