LT8391AEUFD#TRPBF

LED Driver IC Overview

The LT8391AEUFD#TRPBF is a synchronous 4-switch buck-boost LED controller from Analog Devices. It regulates LED current when input voltage is above, below, or equal to output voltage. Key electrical parameters include a 60V maximum input voltage, 10A output current capability, and an operating frequency range of 600kHz to 2MHz. The device supports internal 25% triangle spread spectrum operation for low EMI. It operates within a junction temperature range of -40°C to 125°C and features analog/PWM dimming capabilities.

LED Driver IC Feature Summary

• Synchronous four-switch buck-boost topology enables seamless transitions between step-down, step-up, and direct modes regardless of input-output voltage relationships.
• Proprietary peak-buck/peak-boost current mode control scheme provides precise LED current regulation with adjustable and synchronizable switching frequencies.
• Integrated spread spectrum modulation reduces electromagnetic interference without requiring external filtering components.

LED Driver IC Applications

• Automotive LED lighting systems
• Industrial LED driver circuits
• Battery-powered LED applications

LED Driver IC Procurement Notes

Verify the specific suffix EUFD corresponds to the 28-QFN package and commercial/industrial temperature grade as documented in the official datasheet. Confirm that the TRPBF designation indicates tape-and-reel packaging. Cross-reference the manufacturer part number with the latest Analog Devices documentation to ensure compatibility with your system requirements before procurement.

LED Driver IC Selection Notes

Select this component when input voltage varies significantly relative to the LED string voltage, requiring both buck and boost capabilities. The wide 600kHz to 2MHz frequency range allows optimization for efficiency versus component size. Ensure the application requires single-channel high-current regulation and benefits from the integrated spread spectrum feature for EMI compliance.

LED Driver IC Part Context

This part belongs to the LT8391A family of synchronous buck-boost LED controllers. It shares core functionality with variants like LT8391EFE but differs in package type (QFN vs. TSSOP) and temperature rating. The family is designed for high-efficiency LED driving in environments where input voltage stability cannot be guaranteed.

LED Driver IC Replacement Considerations

Direct substitutes include other LT8391A variants such as LT8391AFE or LT8391IFE if package differences are acceptable. Verify pinout compatibility and thermal performance when substituting between QFN and TSSOP packages. Check temperature grades to ensure they meet system operational limits.