The TP4055 is a complete constant-current/constant-voltage linear charger for single cell lithium-ion batteries, Reverse battery protection. Its SOT package and low external component count make the TP4055 ideally suited for portable applications. Furthermore, the TP4055 can work within USB and wall adapter.

No external sense resistor is needed, and no blocking diode is required due to the internal PMOSFET architecture and have prevent to negative Charge Current Circuit. 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 TP4055 automatically terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached.

When the input supply (wall adapter or USB supply) is removed, the TP4055 automatically enters a low current state, dropping the battery drain current to less than 2uA. The TP4055 can be put into shut down mode, reducing the supply current to 40uA. Other features include current monitor, under voltage lockout, automatic recharge and one status pin to indicate charge termination and the presence of an input voltage.

·lithium-ion batteries Reverse battery protection

·Programmable Charge Current Up to 500mA

·No MOSFET, Sense Resistor or Blocking Diode Required

·Complete Linear Charger in SOT23-6 Package for Single Cell Lithium-Ion 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 1% Accuracy

·Charge Current Monitor Output for Gas Gauging

·Automatic Recharge

·Charge Status Output Pin

·C/10 Charge Termination

·40uA Supply Current in Shutdown

·2.9V Trickle Charge Threshold (TP4055)

·Soft-Start Limits Inrush Current

·Available in 6-Lead SOT-23 Package