Lumissil Microsystems IS32LT315x series single-channel and three-channel linear LED drivers with advanced thermal optimization and ASIL-B compliance
High Pressure Side Linear LED Driver Family Image Lumissil Microsystems IS32LT315x Series High Pressure Side Linear LED Drivers with Heat Split/Heat Sharing The product line is designed to meet demanding automotive lighting applications. The range includes single-channel (up to 450 mA) and three-channel (3 x 150 mA) drivers, providing designers with flexible options to power taillights, stop lights, turn lights, etc. All IS32LT315x devices can operate in a wide input range of 4.5 V to 40 V and meet the certification standard of AEC-Q100 temperature class 1 (ambient temperature - 40 ° C to+125 ° C, junction temperature up to+150 ° C).
Each driver uses an external resistor to set the constant current output, and high power applications can use an optional external shunting resistor to share heat and reduce the thermal stress of the device. Some models of the IS32LT315x series, such as IS32LT3151A/C and IS32LT3153A/B/E, provide analog current control pins, LED thermal attenuation or dual brightness control via the NTC thermistor or external FET, and single LED short circuit detection for accurate fault diagnosis. All versions include built-in open circuit/short circuit fault detection at LED string level and support the "Consequence Failure" function, i.e. share FAULT output: if any string fails, this output can disable all connected drives. Some drives of IS32LT315x meet the ISO 26262 ASIL B functional safety standard, enabling a safer thermal intelligent vehicle lighting design. IS32LT315x series adopts compact heat dissipation enhanced package (SOP-8 EP for cost optimization version and eTSOP for functional version), which provides comprehensive solution for LED lighting inside and outside the vehicle, high output current, strong fault protection and simplified thermal management in single IC.
characteristic
Wide input voltage range: 4.5 V to 40 V, suitable for automotive applications
Single or triple channel options for flexible design
Programmable constant current via external resistors
Some models have analog dimming function
Each channel has independent PWM dimming control
Supports external NTC resistors for LED over-temperature protection
Optional thermal shunting resistor reduces LED stress
LED open/short circuit and single LED short circuit fault detection
Shared FAULT pin realizes "cascading failure" function
Low differential pressure (approx. 0.7 V to 0.8 V) to improve efficiency
Low supply current in fault mode: typical value 150 μ A
Functional safety version according to ISO 26262 ASIL-B
Comply with the certification standard of AEC-Q100 temperature class 1 and meet the reliability requirements of automobile class
Encapsulation options for enhanced heat dissipation (eTSSOP14, eTSSOP16, eTSSOP20, and SOP8-EP)
Comply with RoHS and Halogen Free Environmental Standards
application
Tail light and brake light combination (brake light and tail light)
Daytime running lamp (DRL) and position lamp
Turn signal lamp and hazard indicator
Side marker lamps and contour lamps
Reversing lamp
Fog lamp and auxiliary lamp
Interior ambience lamp and dome lamp (automobile)
LED lighting system for motorcycles and e-bikes
Ideal for LED lighting in and out of vehicles with high reliability and thermal performance requirements