Linear Technology has recently introduced a 60V, 1MHz, step-down DC/DC converter designed to operate as a three channel, constant current LED driver.

Each channel of the LT3597 contains a constant current sink LED driver with a dedicated adaptive-output buck converter.

“This design offers maximum efficiency for applications, such as RGB displays, which require different output voltages for each LED string,” said the supplier.

From a 48V input, the LT3597 can drive up to three strings of LEDs, each with up to ten 100mA LEDs in series, delivering efficiencies of over 90%.

Each channel can be independently dimmed with True colour PWM™ dimming, offering dimming ratios as high as 10,000:1. Operating frequency is programmable between 200kHz to 1MHz.

The LT3597 is available in a 5mm x 8mm QFN package.

For more information, see http://www.linear.com/product/LT3597