LT8391HUFD#TRPBF

LED Driver IC Overview

The LT8391HUFD#TRPBF is a synchronous four-switch buck-boost LED controller from Analog Devices. It regulates LED current when the input voltage is above, below, or equal to the output voltage. The device utilizes a proprietary peak-buck/peak-boost current mode control scheme. This architecture supports adjustable and synchronizable fixed-frequency operation ranging from 150kHz to 650kHz. It features analog and PWM dimming capabilities for precise light control. The component is housed in a 28-QFN (4x5 mm) package.

LED Driver IC Feature Summary

• Synchronous four-switch buck-boost topology enables regulation across varying input-to-output voltage relationships
• Proprietary peak-buck/peak-boost current mode control ensures stable LED current regulation
• Supports adjustable and synchronizable switching frequencies between 150kHz and 650kHz
• Integrates analog and PWM dimming interfaces for flexible brightness control

LED Driver IC Applications

• LED lighting systems
• Display backlights
• Indicator applications

LED Driver IC Procurement Notes

Verify the specific suffix TRPBF indicates tape-and-reel packaging configuration. Confirm the HUFD designation corresponds to the correct temperature grade and package variant. Ensure compatibility with the intended switching frequency range of 150kHz to 650kHz. Validate that the 28-QFN footprint matches the PCB layout requirements. Cross-reference the manufacturer's latest datasheet for any updates to electrical characteristics or pin assignments.

LED Driver IC Selection Notes

Select this controller when input voltage fluctuates significantly relative to the LED string voltage. The synchronous buck-boost design eliminates the need for external Schottky diodes, improving efficiency. The wide operating frequency range allows optimization for inductor size versus EMI performance. PWM dimming support is suitable for applications requiring high-contrast brightness adjustment without color shift.

LED Driver IC Part Context

This component belongs to the LT8391 family of LED drivers. It shares core control logic with variants such as LT8391CEUFDM#PBF and LT8391AEFE#TRPBF. Differences typically involve package type, temperature rating, or reel specifications. The HUFD suffix specifically denotes the QFN package and commercial/industrial temperature range options provided by Analog Devices.

LED Driver IC Replacement Considerations

Direct substitutes include LT8391CEUFDM#PBF and LT8391AEFE#TRPBF. Verify package compatibility and temperature ratings before substitution. Ensure the replacement part supports the required 150kHz to 650kHz frequency range. Check if the alternative suffix matches the desired packaging format.