LTC4058-4.2

U U FEATURES s Programmable Charge Current Up to 950mA s Complete Linear Charger in DFN Package s No MOSFET, Sense Resistor or Blocking Diode Required s Thermal Regulation Maximizes Charge Rate Without Risk of Overheating* s Battery Kelvin Sensing Improves Charging Accuracy s Charges Directly from a USB Port s C/10 Charge Termination s Preset 4.2V Charge Voltage with ±1% Accuracy s Charge Current Monitor Output for Gas Gauging* s Automatic Recharge s Charge Status Output s “AC Present” Output s 2.9V Trickle Charge Threshold (LTC4058) s Available Without Trickle Charge (LTC4058X) s Soft-Start Limits Inrush Current s Low Profile (3mm × 3mm × 0.75mm) DFN Package U APPLICATIO S s Cellular Telephones, PDAs, MP3 Players s Bluetooth Applications LTC4058-4.2/LTC4058X-4.2 Standalone Linear Li-Ion Battery Charger with Thermal Regulation in DFN DESCRIPTIO The LTC®4058 is a complete constant-current/constantvoltage linear charger for single cell lithium-ion batteries. Its DFN package and low external component count make the LTC4058 ideally suited for portable applications. Furthermore, the LTC4058 is designed to work within USB power specifications. The LTC4058 can Kelvin sense the battery terminal for more accurate float voltage charging. No external sense resistor or external blocking diode are required due to the internal MOSFET architecture. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature conditions...