LTC4069 Datasheet | Linear Technology

Features Standalone 750m A Li-Ion Battery Charger in 2 × 2 DFN with NTC Thermistor Input Description n plete Linear Charger in 2mm × 2mm DFN Package n C/10 Charge Current Detection Output n Timer Charge Termination n Charge Current Programmable Up to 750m A with 5% Accuracy n No External MOSFET, Sense Resistor or Blocking Diode Required n NTC Thermistor Input for Temperature Qualified Charging n Preset 4.2V Float Voltage with 0.6% Accuracy n Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charge Rate Without Risk of Overheating n Charge Current Monitor Output for Gas Gauging n Automatic Recharge n Charges Single-Cell Li-Ion Batteries Directly from USB Port n 20µA Supply Current in Shutdown Mode n Soft-Start Limits Inrush Current n Tiny 6-Lead (2mm × 2mm) DFN Package Applications n Wireless PDAs n Cellular Phones n Portable Electronics L, LT, LTC LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6522118, 6700364. The LTC®4069 is a plete constant-current/constant-voltage linear charger for single-cell lithium-ion batteries. The 2mm × 2mm DFN package and low external ponent count make the LTC4069 especially well-suited for portable applications. Furthermore, LTC4069 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 architecture. Thermal feedback regulates charge current to limit the die temperature during high power operation or high ambient temperature conditions. When the input supply (wall adapter or USB supply) is removed, the LTC4069 automatically enters a low current...