DOWO TP4054-DW

TP4054 is a linear charger for single-cell rechargeable lithium batteries, supporting constant-current and constant-voltage charging. Its compact SOT package and minimal external component requirements make it an ideal choice for portable applications powered by USB or AC adapters. The device integrates an internal MOSFET structure and reverse-current protection circuit, eliminating the need for external sense resistors and isolation diodes. A thermal feedback mechanism regulates the charge current to limit die temperature during high-power operation or in high-ambient-temperature environments. The charge voltage is fixed at 4.2V, and the charge current can be programmed via an external resistor. When the charge current drops to 1/10 of the programmed value, the charging process terminates automatically. When the input power source is removed, the device automatically enters a low-current standby state, in which the battery leakage current is less than 2μA. It can also be placed in shutdown mode, reducing the supply current to 50μA.

• Programmable charge current up to 800mA
• No external MOSFET, sense resistor, or blocking diode required
• Constant-current/constant-voltage operation with thermal regulation
• Li-Ion battery charging via USB port
• Preset charge voltage 4.2V with 1% accuracy
• Charge status output pin
• C/10 charge termination
• Automatic recharge
• Trickle charge threshold voltage 2.8V
• Reverse battery protection
• Reverse power supply protection
• Package: SOT-23-5

• Bluetooth applications
• Lithium battery chargers
• Portable devices