LT3475IFE-1#PBF - A Robust Dual Channel LED Driver from Linear Technology

The LT3475IFE-1#PBF is a high-performance, dual-channel LED driver integrated circuit (IC) designed by Linear Technology, now part of Analog Devices, to cater to the growing demand for efficient and reliable lighting solutions. This IC is tailored for driving LEDs with a constant current for uniform brightness, making it an ideal choice for a wide range of applications including automotive, industrial, and general-purpose LED lighting.

This LED driver is capable of delivering up to 1.5A of continuous current per channel, with each channel capable of driving up to 10 white LEDs in series, ensuring a wide operating range for various LED configurations. Its wide input voltage range of 4.5V to 36V makes it suitable for applications powered by a variety of sources, from single-cell Li-Ion to automotive inputs without the need for external voltage regulation.

The LT3475IFE-1#PBF features a high-side current sense, which allows for the cathode of the LED string to be connected directly to the ground, simplifying PCB layout and thermal design. Additionally, the device offers a high switching frequency of up to 2MHz, which enables the use of small, low-profile inductors and capacitors, thus reducing the overall solution footprint and cost.

Built with protection in mind, the LT3475IFE-1#PBF includes a range of safety features such as open LED protection, which prevents overvoltage in the event an LED string opens during operation, and thermal shutdown to protect the device under high-temperature conditions. The device also offers independent channel shutdown, providing designers with flexibility and control over the lighting system.

The IC is housed in a thermally efficient 16-lead TSSOP package with an exposed pad for enhanced thermal performance. This package, combined with the need for minimal external components, makes the LT3475IFE-1#PBF a compact and reliable solution for dual-channel LED driving requirements.

With its robust design, flexibility, and high efficiency, the LT3475IFE-1#PBF from Linear Technology stands out as a versatile component for developing advanced LED lighting systems.