Linear Technology LTC4056ETS8-4.2#TRPBF USB Power Manager and Li-Ion Charger

The LTC4056ETS8-4.2#TRPBF is a highly integrated power management and battery charger IC designed by Linear Technology, specifically for single-cell lithium-ion batteries. This compact device simplifies the complexity of USB-based charging and power regulation, making it an ideal solution for portable electronic devices such as personal digital assistants (PDAs), mobile phones, digital cameras, and MP3 players.

Key Features:

• USB Compatibility: The LTC4056ETS8-4.2#TRPBF is designed to interface directly with USB power sources, ensuring compliance with USB specifications for current limiting and reducing the need for external components.
• Integrated Charging: It features a complete constant-current/constant-voltage linear charger for single-cell lithium-ion batteries, with a fixed float voltage of 4.2V, which is the standard for most Li-Ion cells, ensuring safe and efficient charging.
• Thermal Regulation: To maximize the charging rate without the risk of overheating, the device includes thermal feedback that regulates the charge current to limit the die temperature during high power operation or high ambient temperature conditions.
• Automatic Load Detection: The LTC4056ETS8-4.2#TRPBF can automatically detect the presence of a load connected to the USB port and will seamlessly transition between charging and on-demand power supply modes.
• Preserve Battery Energy: It has a low battery leakage current of less than 1uA, which helps preserve battery charge during idle periods.
• Charge Status Indication: The device provides a charge status output that can be used to drive an LED or interface with a microcontroller for real-time charging monitoring.

Compact and Efficient Design:

Enclosed in an 8-lead SOT-23 package, the LTC4056ETS8-4.2#TRPBF is designed for space-constrained applications. Its small footprint and minimal external component requirements make it an efficient choice for portable device designs where board space is at a premium.

Protection Features:

Safety is a key concern in power management, and the LTC4056ETS8-4.2#TRPBF includes several protection features such as automatic recharge, overvoltage protection, and short-circuit protection, ensuring reliable operation and longevity of the battery and the device it powers.

Overall, the LTC4056ETS8-4.2#TRPBF from Linear Technology is a versatile, efficient, and easy-to-implement solution for managing USB power and charging lithium-ion batteries in modern portable electronics.