LT8391HFE#TRPBF

LED Driver IC Overview

The LT8391HFE#TRPBF is a synchronous 4-switch buck-boost LED controller from Analog Devices, designed for high-efficiency current regulation. It supports an input voltage range of 4 V to 60 V and delivers up to 10 A output current. The device operates at a fixed frequency of 600 kHz with spread spectrum capability to minimize electromagnetic interference. It features a TSSOP-28 package and maintains operation across a temperature range of -40°C to +150°C. With a maximum supply current of 2.8 mA, it provides seamless transitions between buck, boost, and bypass modes for stable LED driving in automotive and industrial applications.

LED Driver IC Feature Summary

• Proprietary peak-buck/peak-boost current mode control scheme enables adjustable and synchronizable fixed frequency operation or internal spread spectrum functionality.
• Seamless low-noise transitions between buck, boost, and bypass regions allow regulation regardless of whether the input voltage is above, below, or equal to the output voltage.
• Supports both internal dimming ratios up to 128:1 and external dimming ratios up to 2000:1 for precise light control.

LED Driver IC Applications

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

LED Driver IC Procurement Notes

Verify the specific suffix #TRPBF indicates tape-and-reel packaging when ordering. Confirm that the TSSOP-28 package variant matches your PCB footprint requirements. Ensure the 60V rating aligns with your system's maximum input voltage headroom. Check for RoHS compliance documentation if required by your manufacturing standards. Validate that the 10A current capability meets your thermal design constraints.

LED Driver IC Selection Notes

Select this component when input voltages vary significantly relative to the LED string voltage, requiring buck-boost topology. Choose the TRPBF version for automated surface-mount assembly processes. Consider the 600kHz switching frequency for balancing efficiency and passive component size. Evaluate the 2.8mA supply current against total system power budgets. Verify compatibility with analog or PWM dimming interfaces for your application.

LED Driver IC Part Context

The LT8391 belongs to Analog Devices' family of synchronous buck-boost controllers. It shares architectural similarities with the LT8390 but is optimized specifically for LED lighting drivers. Unlike general-purpose regulators, it integrates features tailored for constant current LED regulation. The HFE#TRPBF designation specifies the lead-free, tape-and-reel packaged version of this integrated circuit.

LED Driver IC Replacement Considerations

LT8391HFE#PBF is the tube-packaged equivalent of this component. LT8390AIFE#TRPBF offers similar buck-boost capabilities but targets general switching regulator applications rather than dedicated LED driving. Verify pinout compatibility and control loop stability when substituting with related family members.