LT3791IFE

LED Driver IC Overview

The LT3791IFE is a synchronous 4-switch buck-boost LED driver controller from Analog Devices Inc. It operates with an input voltage range of 4.7V to 58V and supports output voltages up to 60V. The device regulates LED current for strings up to 52V, accommodating input voltages above, below, or equal to the output. It features a switching frequency between 200kHz and 700kHz and includes analog and PWM dimming capabilities. Packaged in a 38-TSSOP-EP with exposed pad, it functions as a DC-DC controller suitable for high-efficiency lighting applications.

LED Driver IC Feature Summary

• Synchronous 4-switch buck-boost topology enabling seamless transitions between operating modes
• Supports analog and PWM dimming control for precise light regulation
• Wide input voltage range accommodating various power supply configurations
• Regulates LED current for strings up to 52V regardless of input-output relationship

LED Driver IC Applications

• High-efficiency LED drivers
• General illumination systems
• Automotive lighting applications

LED Driver IC Procurement Notes

Verify component authenticity through authorized Analog Devices distributors. Confirm package marking matches 38-TSSOP-EP specifications. Check datasheet revisions for potential epoxy or wafer site changes. Ensure ordering suffix corresponds to tape-and-reel packaging if required. Validate RoHS compliance status prior to integration.

LED Driver IC Selection Notes

Select this controller when input voltage varies significantly relative to the LED string voltage. Choose for designs requiring both analog and digital dimming interfaces. Consider thermal performance due to the exposed pad package. Verify that the 200kHz to 700kHz frequency range aligns with external component selection constraints.

LED Driver IC Part Context

The LT3791 belongs to the True Color PWM series of LED driver controllers. It complements other Linear Technology regulators by providing specialized buck-boost functionality. The part is designed for applications demanding high efficiency and wide dynamic range. It serves as a core component in modern solid-state lighting solutions.

LED Driver IC Replacement Considerations

LT3791EFE#PBF: Pin-compatible alternative with similar electrical characteristics.

LED Driver IC FAQ

Can the LT3791 regulate current when the input voltage equals the output voltage?

Yes, the synchronous 4-switch topology allows seamless transitions and regulation even when input voltage is equal to the output voltage.

What dimming methods are supported by this controller?

The LT3791IFE supports both analog and PWM dimming techniques for controlling LED brightness.