DESCRIPTION
The LTC®4058 is a complete constant-current/constant voltage 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.

FEATURES
■ Programmable Charge Current Up to 950mA
■ Complete Linear Charger in DFN Package
■ No MOSFET, Sense Resistor or Blocking Diode Required
■ Thermal Regulation Maximizes Charge Rate Without Risk of Overheating*
■ Battery Kelvin Sensing Improves Charging Accuracy
■ Charges Directly from a USB Port
■ C/10 Charge Termination
■ Preset 4.2V Charge Voltage with ±1% Accuracy
■ Charge Current Monitor Output for Gas Gauging*
■ Automatic Recharge
■ Charge Status Output
■ “AC Present” Output
■ 2.9V Trickle Charge Threshold (LTC4058)
■ Available Without Trickle Charge (LTC4058X)
■ Soft-Start Limits Inrush Current
■ Low Profile (3mm × 3mm × 0.75mm) DFN Package

APPLICATIONS
■ Cellular Telephones, PDAs, MP3 Players
■ Bluetooth Applications