TOP POWER ASIC TP4054-42-SOT25R

TP4054 is a complete single-cell lithium-ion battery charger employing a constant-current/constant-voltage linear charging architecture. Its SOT package and minimal external component count make the TP4054 an ideal choice for portable applications. The TP4054 is compatible with both USB power supplies and adapter power sources.

The internal PMOSFET architecture, combined with reverse-charge protection circuitry, eliminates the need for external sense resistors and isolation diodes. Thermal feedback regulates the charge current to limit die temperature during high-power operation or elevated ambient temperature conditions. The charge voltage is fixed at 4.2V, while the charge current is externally programmable via a single resistor. When the charge current drops to 1/10 of the programmed value after reaching the final float voltage, the TP4054 automatically terminates the charge cycle.

When the input voltage (AC adapter or USB supply) is removed, the TP4054 automatically enters a low-current state, reducing battery leakage current to below 2µA. The TP4054 can also be placed in shutdown mode, reducing supply current to 45µA. Additional features include a charge current monitor, undervoltage lockout, automatic recharge, and a status pin indicating charge termination and input voltage presence.

• Programmable charge current up to 800mA
• No MOSFET, sense resistor, or blocking diode required
• Complete linear charger for single-cell Li-Ion batteries in SOT23-5 package
• Constant-current/constant-voltage operation with thermal regulation for maximizing charge rate without risk of overheating
• Direct single-cell Li-Ion battery charging from USB port
• 4.2V preset charge voltage with ±1% accuracy
• Charge current monitor output for battery fuel gauging
• Automatic recharge
• Charge status output pin
• C/10 charge termination
• 45uA supply current in standby mode
• 2.9V trickle charge device version
• Soft-start limits inrush current
• 5-pin SOT-23 package

• Cellular phones, PDAs, MP3 players;
• Charging docks;
• Bluetooth applications.