The PJ4054 is a complete constant-current/constant-voltage linear charger for single cell lithium-ion batteries. Its small size and low external component count make it ideal for portable applications.

Applications

• Cellular Telephones
• PDAs
• MP3 Players
• Charging Docks
• Bluetooth Applications

Features

• Programmable Charge Current Up to 800mA
• No MOSFET, Sense Resistor or Blocking Diode Required
• Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charge Rate Without Risk of Overheating
• Charges Single Cell Li-Ion Batteries Directly from USB Port
• Preset 4.2V Charge Voltage
• Automatic Recharge
• 2.9V Trickle Charge Threshold (PJ4054)
• C/10 Charge Termination
• Available in SOT23-5 Package

Benefits

• Simplified Battery Charging Circuitry: Reduces the number of external components needed, making it easier and cheaper to integrate into devices.
• Safe Charging: The thermal regulation feature prevents overheating and ensures the battery is charged safely, prolonging its lifespan.
• Portability: The small package size makes it suitable for integration into portable devices where space is limited.
• USB Compatibility: Can charge Li-Ion batteries directly from a USB port, providing a convenient charging solution.

The PJ4054 is a highly integrated solution for charging single-cell lithium-ion batteries, offering a balance of simplicity, safety, and portability. It is a commonly used component in various consumer electronics.