TP4055

The TP4055 is a complete linear charger for single cell lithium-ion batteries. It has reverse battery protection and power supply reverse connect protection with a charging current of 500mA, and it includes trickle, constant-current and constant-voltage. Its SOT23-5 package and low external component count make it ideally suited for portable applications. Furthermore, the TP4055 can work within USB and wall adapter. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature. Full charge voltage of 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 reaching. 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. Other features include under voltage lockout, automatic recharge and one status pins to indicate charge termination.

Applications

• PDA
• MP3
• charging stand
• Bluetooth applications

Key features

• 500mA Programmable Charge Current
• Lithium-ion batteries Reverse battery protection
• Maximize Charge Rate Without Risk of Overheating
• For Single Cell titanic acid Lithium-Ion Batteries
• Trickle, constant-current and constant-voltage control
• Charges Single Cell Li-Ion Batteries Directly from USB Port
• Preset Charge Voltage with 1% Accuracy
• Highest input can be up to 9V
• Automatic Recharge
• One Charge Status Output Pins
• C/10 Charge Termination
• 40uA Supply Current in Shutdown
• Available in 5-Lead SOT-23 Package