LT3791IFE#TRPBF

LED Driver IC Overview

The LT3791IFE#TRPBF is a synchronous four-switch buck-boost LED driver controller manufactured by Analog Devices Inc. It operates within an input voltage range of 4.7V to 60V and supports output voltages up to 60V. The device regulates LED current with ±6% accuracy for strings between 0V and 52V. It features a fixed-frequency forced continuous current mode architecture with adjustable or synchronized switching frequencies from 200kHz to 700kHz. The controller includes analog and PWM dimming capabilities, input and LED current monitors, and fault protection for open or short circuits.

LED Driver IC Feature Summary

• Synchronous four-switch buck-boost topology enables seamless transitions between buck, boost, and pass-through modes without MOSFET refresh cycles.
• Supports True Color PWM and analog dimming for precise light control applications.
• Integrated current monitors allow regulation based on input and LED current feedback.
• Includes hardware protection mechanisms that trigger restart or latch-off operations during LED open or short circuit faults.

LED Driver IC Applications

• Automotive headlight and driving light systems
• General illumination lighting fixtures
• Battery-powered lighting systems

LED Driver IC Procurement Notes

Verify the suffix #TRPBF indicates tape and reel packaging when ordering. Confirm the IFE suffix corresponds to the industrial temperature range (-40°C to +125°C). Ensure compatibility with the 38-pin TSSOP-EP package footprint in your PCB design. Cross-reference the specific revision level if long-term supply stability is required for production.

LED Driver IC Selection Notes

Select this component for applications requiring wide input voltage ranges exceeding standard buck or boost limits. The four-switch architecture is suitable where efficiency across varying input-output differentials is critical. Consider the 38-pin exposed pad package for thermal management in high-power designs. Verify that the external MOSFET selection aligns with the 60V rating and current requirements of the target LED string.

LED Driver IC Part Context

This part belongs to the LT3791 family of synchronous buck-boost controllers. The LT3791 series is designed for high-efficiency LED driving where input voltage may fluctuate above, below, or equal to the output voltage. The 'I' suffix denotes the industrial temperature grade, while 'FE' specifies the TSSOP-EP package. The '#TRPBF' designation confirms lead-free tape and reel packaging for automated assembly.

LED Driver IC Replacement Considerations

Direct pin-to-pin replacements within the same family include LT3791EFE#TRPBF (Extended temp) and LT3791HFE#TRPBF (Military/High temp). Other variants like LT3791MPFE#TRPBF offer military-grade specifications. Ensure thermal performance and temperature ratings match the application environment before substituting.