TP4054

The TP4054 from TP is a complete constant-current/constant-voltage linear charger specifically designed for single-cell lithium-ion batteries. Its compact SOT-23-5 package and minimal external component requirements make it highly suitable for portable applications.

This charger IC features a preset 4.2V charge voltage with 1% accuracy and allows for programmable charge current up to 800mA via an external resistor. It integrates thermal regulation to manage die temperature during high power operation or high ambient temperatures, maximizing the charge rate without risk of overheating. The TP4054 can be powered from USB or a wall adapter and does not require an external sense resistor or blocking diode due to its internal PMOSFET architecture.

Key features include automatic charge termination when the charge current drops to C/10, a low battery drain current of less than 2uA when the input supply is removed, and a shutdown mode that reduces supply current to 45uA. It also offers a charge current monitor output for gas gauging, under-voltage lockout, automatic recharge, and a status pin indicating charge termination and input voltage presence.

The TP4054 is ideal for applications such as cellular telephones, PDAs, MP3 players, charging docks, and Bluetooth devices. It is available in a 5-lead SOT-23-5 package suitable for surface mounting.