The breadth of LED applications has grown to encompass

emissions. The integrated synchronous switches are run with

everything from general lighting to automotive, industrial and test

controlled switching edges that do not ring— offering just the

equipment, sign boards and safety equipment. As a result, the

right balance of high efficiency and low noise— and can be run at

breadth of design requirements for LED drivers has expanded.

up to 2.5MHz, resulting in compact solutions.

The latest LED solutions require drivers that are compact, efficient, low noise, and feature high dimming ratios and advanced fault protection. The LT3922 easily meets these demands.

The LT3922 with integrated switches and internal PWM dimming

Choice of Topologies: Boost, Buck mode, Boost-buck

LED strings are driven by a controlled current that does not need

+

− to be returned directly to ground. Both LED and LED, or either one, can be attached to non-ground potentials. This opens up the field of options for floating output DC / DC LED driver topologies, including buck mode( step-down) and boost-buck( step-up and

The LT3922 36V, synchronous LED driver with integrated 2A

step-down). The LT3922’ s high side PWMTG driver and

switches can be configured as a boost, buck or boost-buck LED

synchronous switches can be configured as a boost, buck mode or

driver. Its high efficiency synchronous and integrated power

boost-buck LED driver, while retaining use of all of the ICs

switches fit into a tiny 4mm × 5mm QFN package. This device

features— namely, internal PWM dimming, SSFM, low EMI,

integrates Linear’ s most advanced switching technologies,

ISMON output current monitor, and output fault protection carry

condensing high power capability into tight spaces while

over from the standard boost topology to the buck mode and

controlling the edge rates and mitigating unwanted field

boost-buck.