The IS32LT3965-QWCLA3-TR from Lumissil Microsystems is an Automotive Qualified Synchronous DC/DC Switching LED Driver IC that is ideal for logo lamps, license plate lights, interior lights, turn/stop lights, and front and rear fog light applications. It requires a DC supply of 3.8 - 38 V and provides an output current of up to 1.5 A. This LED driver integrates an N-channel MOSFET to operate in a buck configuration and externally connects a resistor at the high side to maintain a steady LED output current, thereby allowing the output voltage to be automatically adjusted for a wide range of LED configurations. It runs in fixed frequency mode during switching and configures the on-time using an external resistor connected between the VCC and TON pins (switching frequency).

This AEC-Q100-qualified driver dithers the switching frequency to allow the electromagnetic energy to spread over a wider frequency band, which helps in optimizing the EMI performance. It includes under voltage lockout (UVLO) protection, LED binning function, LED over-temperature thermal roll-off protection, built-in robust fault protection, and reporting functionalities to prevent false triggers and short-circuit-related damages. This RoHS-compliant LED driver also integrates fault flags for multiple device operations to comply with the one-fail-all-fail function. It is available in a surface-mount package that measures 3 x 4 mm.