MILPITAS, Calif., December 13, 2021 -- Lumissil Microsystems, a division of Integrated Silicon Solution, Inc.(ISSI), announced today an LED driver to further expand its portfolio of automotive exterior lighting solutions.The IS32LT3961 is a fully integrated switching Buck LED driver with advanced features such as high side currentsensing, ultra-low 2μA shutdown current, spread spectrum for low EMI, 2A integrated MOSFET switch withaccurate LED current over the operating temperature range. This single channel switching LED driver supportsdigital PWM and/or analog voltage LED dimming techniques making it ideal for automotive exterior lighting suchas headlight, daytime running light (DRL), rear combination lights (RCL), or fog lights and Motorcycle headlights.

The IS32LT3961 buck LED driver can drive a string of high current LEDs with advanced features such as ultra-low2µA shutdown current to conserve battery power, 5% output current accuracy for optimal LED brightnesscontrol, analog dimming for LED binning or thermal roll off protection and spread spectrum to minimize thedevice EMI profile. Other key features are an integrated MOSFET for minimal BOM and small PCB footprint,output voltage pin used by external circuitry for LED binning or thermal roll off, LED current monitoring pin andcomes in a small thermally enhanced eTSSOP-16 package. It operates from a wide 5V to 60V supply voltage andis guaranteed to meet specifications over the extended -40°C ~ +150°C automotive temperature range.

“The IS32LT3961 is our latest AEC-Q100-compliant LED driver which further expands our portfolio of automotivesolutions. Lumissil is committed to providing our automotive customers with advanced driver technology fornext generation exterior vehicle lighting designs.” Said Ven Shan, Vice President of Marketing. “This driverdemonstrates our continued commitment to integrate innovative features while delivering cost-effectivesolutions. The IS32LT3961 incorporates the latest features including advanced fault protection in a compact 16-pin package to provide a highly reliable solution with power and space savings; while at the same time loweringthe overall system costs due to its many integrated functions.”

The high-side current sensing feature makes it possible to drive a remote LED board with only a single wire sincethe LED cathode is referenced to ground making it possible to use the chassis ground and eliminate the returnwire. The integrated current sense pin provides an isolated voltage representation of the LED current forenhanced system monitoring. The VDD pin provides a stable 6V over the wide operating voltage rangeremoving the need for an external voltage source circuit when implementing NTC resistor thermal sensing. TheSCD pin can be programmed to detect a specific single LED short threshold for fail safe operation and reportingon the Fault pin.

Availability and pricing

The IS32LT3961 is available now in production quantities, with AEC-Q100 qualification and supporting PPAPdocumentation. The device comes in a thermally enhanced 16-pin TSSOP package is priced at $0.75 each in 10kpcs quantities.