TP4054-MS

The TP4054-MS is a high-performance single-cell lithium-ion battery constant-current/constant-voltage linear charger. Housed in a SOT23-5L package with minimal external components, it is suitable for portable products and can be powered by USB or adapter power supplies. Based on a special internal MOSFET architecture and anti-reverse charging circuit, no external sense resistors or isolation diodes are required. When the ambient temperature is too high or in high-power applications, thermal feedback adjusts the charging current to reduce the chip temperature. The charge voltage is fixed at 4.24V, and the charge current can be set externally via a single resistor. When the charge current drops to 1/10 of the programmed value after reaching the final float voltage, the chip terminates the charge cycle. When the input voltage is disconnected, the chip enters sleep mode and the battery leakage current drops below 1uA. A shutdown mode is also available, in which the chip quiescent current drops to 25uA. Additional features include undervoltage lockout, automatic recharge, and charge status indication.

Applications

• Solar photovoltaic power supply equipment
• Bluetooth application devices
• Charging dock micro-battery applications
• E-cigarettes
• Mobile phones, PDAs, MP3 players

Key features

• Programmable charge current up to 500mA
• No MOSFET, sense resistor, or blocking diode required
• Compact form factor for complete linear Li-Ion battery charge management
• Constant-current/constant-voltage operation with thermal regulation for maximum charge efficiency without risk of overheating
• Single-cell Li-Ion battery management via USB interface
• 4.24V preset charge voltage with ±1% accuracy
• Charge current output monitoring with charge status indicator
• C/10 charge current termination; 25μA standby current in shutdown mode
• 2.9V trickle charge threshold voltage
• Soft-start to limit inrush current
• Reverse battery protection
• Battery undervoltage protection to activate charging