Automotive-Compliant Switching LED Driver for Exterior Head Lamps and DRL Lamps

 

Lumissil Microsystems, a division of Integrated Silicon Solution, Inc. (ISSI), announced an LED driver to further expand its portfolio of automotive exterior lighting solutions.

The IS32LT3959 is a single inductor, multi-topology controller with constant on-time for driving a ground referenced high-voltage LED string. This single channel switching LED driver integrates a PWM engine with external control to achieve dual brightness capability for Rear Combination Lamp (RCL), Daytime Running Lamp (DRL) and headlights.

The IS32LT3959 switching LED driver supports advanced features such as ultra-low 1.5µA shutdown current to conserve battery power, 3% output current accuracy for optimal LED brightness control, programmable Pulse-Width Modulation (PWM) engine for standalone LED dimming capability and spread spectrum to minimize the device EMI profile. Other key features are programmable single LED short detection, both analog and digital dimming, LED current monitoring pins, device and LED temperature monitoring, single inductor requirement for all switching topologies and comes in a thermally enhanced eTSSOP-28 package. It operates from a wide 4.5 to 55V supply voltage and is guaranteed to meet specifications over the -40°C ~ +150°C operating temperature range.