The LT4055R from Linear Technology is a versatile and highly integrated solution designed for portable power management. It combines a USB compatible power controller with a single-cell Li-Ion battery charger, making it an ideal choice for modern portable electronic devices that require efficient charging and power control.

Key Features:

• USB Compatibility: The LT4055R is designed to work seamlessly with USB power sources, adhering to USB specifications for current limiting and power control.
• Programmable Charging Current: Users can set the charging current from 100mA up to 1A according to the needs of the specific battery and application, providing flexibility and optimization for battery life and charging speed.
• Integrated Power Transistor: With an onboard power transistor, the LT4055R reduces external component count, saving space and simplifying design.
• Thermal Regulation: To ensure safe operation, the device includes thermal regulation that protects the charger and battery by reducing charge current during high temperature conditions.
• Charge Status Indicators: The product features charge status outputs that can drive LEDs or interface with a microcontroller for real-time charge monitoring.
• Automatic Recharge: The LT4055R initiates a new charging cycle when the battery voltage falls below an internal threshold, ensuring the battery remains fully charged over time.

Applications:

• Handheld Devices
• Portable Medical Equipment
• Portable Instruments
• USB-Powered Gadgets
• Stand-Alone Chargers

The LT4055R is a robust and comprehensive solution for managing power in portable devices. Its integration of a USB power controller with a Li-Ion battery charger minimizes the need for additional components, simplifies design, and enhances the reliability of the end product. Whether used in consumer electronics or professional equipment, the LT4055R provides a compact, efficient, and user-friendly solution for power management and battery charging.