The LTC4054LES5-4.2#TR is a high-quality, standalone linear lithium-ion battery charger from Linear Technology that simplifies the process of charging single-cell lithium-ion batteries. This compact, thermally efficient device is designed for space-constrained applications and comes in a low-profile SOT-23 package, making it an ideal choice for portable electronic devices.

Key Features:

• Precise Charge Voltage: The LTC4054LES5-4.2#TR ensures accurate charging by providing a fixed float voltage of 4.2V, which is critical for maintaining the longevity and performance of lithium-ion batteries.
• Adjustable Charge Current: The charge current can be programmed up to 800mA with a single external resistor, allowing for flexibility in charge rate based on the specific requirements of the application and battery capacity.
• Automatic Recharge: To keep the battery at peak capacity, the device initiates a recharge cycle when the battery voltage falls below 4.05V.
• Thermal Regulation: To protect against overheating, the LTC4054LES5-4.2#TR includes an internal thermal feedback mechanism that regulates the charge current to limit the die temperature during high power operation or high ambient temperature conditions.
• No External MOSFET, Sense Resistor, or Blocking Diode Required: This charger integrates power components to minimize external part count, which simplifies design and reduces overall system size and cost.
• Status Output: An onboard status output indicates charging in progress, allowing for external indication or system control.
• C/10 Charge Termination: The charger automatically terminates the charge cycle when the charge current drops to one-tenth of the programmed value after the final float voltage is reached.

Applications:

The LTC4054LES5-4.2#TR is suitable for a wide range of applications, including but not limited to:

• Cellular Telephones
• Digital Cameras
• MP3 Players
• USB-Powered Devices
• Handheld Instruments

With its advanced features and compact design, the LTC4054LES5-4.2#TR from Linear Technology provides a simple, efficient, and reliable solution for charging lithium-ion batteries in modern portable electronics.