The LT3486 is a dual step-up DC/DC converter specifically designed to drive up to 16 white LEDs (eight LEDs in series per channel) with constant current. In addition, true PWM dimming delivers constant current to the LEDs, keeping the emitted light at a constant color. Dimming is controlled with the duty cycle of the PWM driver. This method allows for a wide 1000:1 dimming range. The LT3486’s high efficiency, current mode, and fixed frequency operation ensures uniform LED brightness, low noise, and maximum battery life. Its 2.5- to 24-V input voltage range enables it to operate in applications from lithium ion battery-powered hand-held devices to automotive backlighting applications.

The LT3486 switching frequency can be set between 200 kHz and 2 MHz via a single resistor. Because the LT3486 features constant frequency architecture, noise is minimized, eliminating potential interference with any on-board RF or audio circuitry. Additional features include internal soft-start/inrush current limiting and open LED protection. The combination of the LT3486’s high efficiency, versatility, low noise, and extremely small footprint make it ideal for a variety of backlighting applications requiring many white LEDs in a space-constrained form factor.

The LT3486EDHC is available in a 5 mm × 3 mm DFN-16 package. The LT3486EFE is in a TSSOP-16E package. Pricing starts at $2.50 each and $2.60 each, respectively, for 1,000-piece quantities.

Linear Technology Corp.
www.linear.com