L99LD20Q6TR

Overview

The L99LD20Q6TR is a high-power LED driver IC designed for automotive front lighting applications. It features a monolithic dual buck converter topology with integrated n-channel MOSFETs driven by a bootstrap circuit. The device supports an operating battery voltage range of 5.5V to 24V and delivers up to 1.5A output current per channel. It operates within a frequency range of 100kHz to 450kHz and withstands supply voltages up to 24V, with output capabilities reaching 50V. The component is housed in a 40-QFN (6x6) package and is qualified to AEC-Q100 standards for automotive use.

Feature Summary

• Monolithic dual buck converter architecture with integrated switching MOSFETs
• Lossless current sensing eliminating the need for external components
• Integrated PWM generation unit with 10-bit resolution and phase shift capability
• Comprehensive protection including overtemperature shutdown and short circuit detection

Applications

• Automotive front lighting systems
• High-brightness LED string control
• Headlight modules requiring independent channel regulation

Procurement Notes

Verify component authenticity through authorized STMicroelectronics distributors or certified partners. Confirm the specific suffix Q6TR corresponds to the required tape-and-reel packaging configuration. Ensure compliance with RoHS3 directives and check for any relevant Product Change Notices (PCN) regarding manufacturing updates or end-of-life status prior to final design implementation.

Selection Notes

Select this component when designing automotive headlight circuits requiring two independent high-current LED channels. The integrated buck converters simplify board layout by removing external power switches. Consider the 40-QFN package for thermal management requirements and verify that the 5.5V to 24V input range matches the vehicle's electrical system specifications.

Part Context

The L99LD20 belongs to STMicroelectronics' L99LD series of flexible LED drivers specifically engineered for automotive safety and illumination. It serves as a derivative of the L99LD21, differing primarily by the absence of the boost controller section. This makes it suitable for applications where the input voltage is sufficient to drive the LED strings directly without step-up conversion.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.