The KF5056 is a complete constant current & constant voltage linear charger for single cell lithium-ion batteries. Its SOP/MSOP package and low external component count make the KF5056 ideally suited for portable applications. Furthermore, the KF5056 is specifically designed to work within USB power specifications. No external sense resistor is needed, and no blocking diode is 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. The charge voltage is fixed at 4.2V, and the charge current can be programmed externally with a single resistor. The KF5056 automatically terminates the charge cycle when the charge current drops to 1/10 the programmed value after the final float voltage is reached.

When the input supply (wall adapter or USB supply) is removed, the KF5056 automatically enters a low current state, dropping the battery drain current to less than 2uA. The KF5056 can be put into shutdown mode, reducing the supply current to 50uA.

Other features include Battery temperature monitor,under-voltage lockout, automatic recharge and two status pins to indicate charge and charge termination.

      Features

Programmable Charge Current Up to 1000mA

No MOSFET, Sense Resistor or Blocking Diode Required

Complete Linear Charger in SOP/MSOP Package for single Cell Lithium-lon Batteries

Constant-Current/Constant- Voltage Operation with

Thermal Regulation to Maximize Charge Rate

Without Risk of Overheating

Charges Single Cell Li-Ion Batteries Directly from USB Port

Preset 4.2V Charge Voltage with土1% Accuracy

Charge Current Monitor Output for Gas Gauging

Automatic Recharge

Charge state pairs of output, no battery and fault

status display

C/10 Charge Termination

50uA Supply Current in Shutdown

2.9V Trickle Charge Threshold

Soft- Start Limits Inrush Current

Battery temperature monitoring function

Available in SOP8-PP/ MSOP8-PP Package

       Application

Cellular Telephones, PDAs, MP3 /MP4 Players .

Charging Docks and Cradles

Bluetooth、GPS Applications