LT8391EFE

LED Driver IC Overview

The LT8391EFE is a synchronous four-switch buck-boost LED controller from Analog Devices Inc. It regulates LED current regardless of whether the input voltage is above, below, or equal to the output voltage. The device features a proprietary peak-buck/peak-boost current mode control scheme that supports adjustable and synchronizable switching frequencies. It includes spread spectrum technology to reduce electromagnetic interference (EMI). The component operates with a maximum input voltage of 60V and supports up to 100V output. It offers analog and PWM dimming capabilities and is housed in a 28-lead TSSOP-EP package.

LED Driver IC Feature Summary

• Synchronous four-switch buck-boost topology for wide input/output voltage ranges
• Proprietary peak-buck/peak-boost current mode control for precise regulation
• Integrated spread spectrum modulation to minimize EMI noise
• Supports both analog and pulse-width modulation (PWM) dimming methods

LED Driver IC Applications

• Automotive exterior lighting systems
• High-power LED street lighting fixtures
• Industrial high-bay LED illumination
• LED display driver applications

LED Driver IC Procurement Notes

Verify the specific suffix #PBF indicates lead-free packaging compliant with RoHS standards. Confirm the 28-TSSOP-EP package type matches your PCB footprint requirements. Check official Analog Devices documentation for the latest temperature grade specifications and ensure the supplier provides valid traceability data for automotive-grade components.

LED Driver IC Selection Notes

Select this controller when the LED load voltage may fluctuate significantly relative to the supply rail, requiring buck-boost capability. Choose the LT8391EFE over standard buck or boost converters if input voltage sag or surges are expected. Consider the spread spectrum feature if strict EMI compliance is required without additional filtering components.

LED Driver IC Part Context

The LT8391EFE belongs to the LT8391 family of synchronous buck-boost controllers designed for high-efficiency LED driving. It succeeds earlier generations like the LT3791 by integrating spread spectrum technology directly into the control loop. This family targets applications demanding robust performance across varying line conditions while maintaining low electromagnetic interference profiles.

LED Driver IC Replacement Considerations

LT8390EFE#PBF: Similar 60V synchronous buck-boost controller but lacks spread spectrum modulation. LT3791EFE#PBF: Earlier generation 60V controller without integrated spread spectrum features.