Linear Technology's LTC4055TEUF: USB Power Controller and Li-Ion Charger

The LTC4055TEUF is a highly integrated power management solution from Linear Technology, designed to simplify the charging and power control of lithium-ion batteries in USB-powered devices. This compact, efficient device combines a USB power controller with a full-featured Li-Ion battery charger, making it an ideal choice for portable electronics that require a reliable and efficient charging solution.

Key Features:

• USB Compatibility: The LTC4055TEUF is compliant with USB specifications, allowing for seamless integration with USB-powered devices. It can handle USB input currents up to 500mA, in accordance with USB 2.0 standards.
• Integrated Li-Ion Charger: The device features a constant-current/constant-voltage charger for single-cell lithium-ion batteries, ensuring a safe and fast charging cycle. The charging parameters can be programmed via external resistors to suit various battery capacities and chemistries.
• Automatic PowerPath Control: It intelligently manages power distribution between the USB port, battery, and load. When the USB power is available, it can simultaneously charge the battery and power the load. If the USB power is removed, it automatically switches to the battery without interruption.
• Thermal Regulation: To prevent overheating, the LTC4055TEUF includes thermal regulation circuitry that reduces charge current in the event of excessive temperature rise.
• Preserve Battery Energy: The device features a "suspend" mode that reduces battery drain when the USB input is in suspend state.
• Compact Design: Housed in a low-profile (0.75mm) 16-lead QFN package, the LTC4055TEUF is suitable for space-constrained applications.

Applications:

The LTC4055TEUF is versatile and can be used in a variety of portable devices, including:

• Cellular Telephones
• Personal Digital Assistants (PDAs)
• Portable Media Players
• Digital Cameras
• USB-Powered Gadgets and Peripherals

With its advanced features and compact size, the LTC4055TEUF from Linear Technology is an excellent choice for designers looking to incorporate a reliable power management system into their USB-powered, battery-operated devices.