LT8391AIUFD#PBF

LED Driver IC Overview

The LT8391AIUFD#PBF is a synchronous 4-switch buck-boost LED controller from Analog Devices, designed for high-performance LED lighting applications. It operates with an input voltage range of 4 V to 60 V and supports output voltages up to 60 V. The device regulates constant current output up to 2 A, utilizing a switching frequency between 150 kHz and 650 kHz. Packaged in a QFN-28 form factor, it functions within a temperature range of -40°C to +125°C. Key electrical specifications include a maximum supply current of 2.8 mA and support for PWM dimming control.

LED Driver IC Feature Summary

• Synchronous four-switch topology enables efficient regulation across wide input-to-output voltage differentials
• Integrated open LED protection safeguards against fault conditions during operation
• Supports analog and PWM dimming methods for precise light intensity control

LED Driver IC Applications

• High-power LED street lighting systems
• Industrial area illumination fixtures
• Automotive exterior lighting modules

LED Driver IC Procurement Notes

Verify component authenticity through authorized Analog Devices distributors or certified partners. Confirm the specific suffix PBF indicates lead-free packaging compliance. Ensure the QFN-28 package variant matches your PCB footprint requirements. Check for any recent product change notifications regarding pinout or thermal characteristics before finalizing procurement orders.

LED Driver IC Selection Notes

Select this controller when input voltage varies significantly relative to the LED string voltage, requiring both buck and boost capabilities. The 2 A output current rating suits medium-to-high power LED arrays. Consider the 28-QFN package for compact designs requiring efficient thermal dissipation. Verify that the required dimming interface aligns with the supported PWM and analog control options available on this specific model.

LED Driver IC Part Context

This part belongs to the LT8391 family of synchronous buck-boost controllers. It shares architectural similarities with the LT8390 but is optimized specifically for LED driver applications rather than general-purpose voltage regulation. The AIUFD#PBF designation specifies the industrial temperature grade and tube packaging format within the broader product line.

LED Driver IC Replacement Considerations

LT8391EUFD#TRPBF offers similar functionality with tape-and-reel packaging instead of tubes. LT8391AHFE#TRPBF provides alternative packaging options while maintaining core electrical characteristics. Verify pin compatibility and thermal performance when substituting these variants.