Linear Technology LT3485EDD-2 Step-Up DC/DC Converter

The Linear Technology LT3485EDD-2 is a highly efficient, fixed-frequency step-up DC/DC converter designed to operate as a constant-current source, making it ideal for driving white LEDs. Its compact and robust design is encapsulated in a small DFN package, which is perfect for space-constrained applications.

One of the key features of the LT3485EDD-2 is its internal 2.3A, 40V switch, which allows it to power up to eight white LEDs from a single cell Lithium-Ion battery. The high switching frequency of 1.2MHz enables the use of tiny, low-profile inductors and ceramic capacitors, resulting in a minimal footprint and reduced noise that is beneficial for portable applications.

The LT3485EDD-2 also boasts unique True Color PWM™ dimming, which delivers constant LED color with deep dimming capability. The dimming is achieved by applying a fast PWM signal to the CTRL pin, providing a wide range of brightness levels while maintaining color consistency.

With an input voltage range of 2.5V to 16V, the LT3485EDD-2 is versatile and can be used in a variety of applications beyond LED driving, such as bias supplies and small power supplies. Its built-in soft-start function prevents inrush current at startup, which extends the life of the battery and the LEDs. Additionally, the device features open LED protection and thermal protection, ensuring reliable operation under adverse conditions.

For designers concerned with power efficiency, the LT3485EDD-2 offers a high efficiency of up to 85%, which is critical for battery-powered applications. The device also includes a high-side current sense, which eliminates the need for an external sense resistor and simplifies the design process.

In summary, the LT3485EDD-2 from Linear Technology is a powerful, versatile step-up converter that is a perfect choice for driving LEDs and other applications requiring a small, efficient, and reliable power source.