LTC4069-4.4

FEATURES n n n n n n n n LTC4069-4.4 Standalone 750mA Li-Ion Battery Charger in 2 × 2 DFN with NTC Thermistor Input DESCRIPTION www.DataSheet4U.com n n n n n n 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 4.4V 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 The LTC®4069-4.4 is a complete constant-current/ constant-voltage linear charger for high capacity single-cell lithium-ion batteries with a 4.4V float voltage. The 2mm × 2mm DFN package and low external component count make the LTC4069-4.4 especially well-suited for portable applications. Furthermore, LTC4069-4.4 is specifically designed to work within USB power specifications. The CHRG pin indicates when charge current has dropped to ten percent of its programmed value (C/10). An internal timer terminates charging according to battery manufacturer specifications. No external sense resistor or blocking diode is required due to the internal MOSFET archit...