TP4056

A complete single-cell lithium battery linear charger featuring a constant-current/constant-voltage architecture with high accuracy and high reliability. Built-in over-temperature protection ensures the safety of both the IC and the user. The internal PMOSFET architecture and anti-backflow circuit design eliminate the need for external sense resistors and isolation diodes. A thermal feedback mechanism regulates the charge current based on the IC's internal temperature, limiting junction temperature during high-power operation or in high-ambient-temperature environments. The charge voltage is fixed at 4.2V, and the charge current is programmable via an external resistor. The charge cycle terminates automatically when the charge current drops to one-tenth of the programmed value after the final float voltage is reached. When the input power is removed, the IC automatically enters a low-current state, reducing battery leakage current to below 2uA. A shutdown mode is also available, reducing supply current to 45uA. Additional features include charge current monitoring, UVLO, automatic recharge, and status pins indicating end-of-charge and input voltage presence.

Applications

• Mobile phones
• PDA
• MP3 players
• Bluetooth applications
• Other handheld devices

Key features

• Programmable charge current up to 1.2A
• No MOSFET, sense resistor, or isolation diode required
• Constant-current/constant-voltage operation with integrated thermal regulation to maximize charge rate without risk of overheating
• Charges single-cell Li-Ion batteries directly from USB port
• Charge current monitor output for battery fuel gauging
• Automatic recharge
• 2.9V trickle charging
• Soft-start to limit inrush current
• C/10 charge termination
• Available in ESOP8/EMSOP8/DFN2x2-8 packages