LT3791MPFE

LED Driver IC Overview

The LT3791MPFE is a high-voltage, four-switch synchronous buck-boost LED driver controller manufactured by Analog Devices Inc. It operates with a supply voltage range of 4.7V to 60V and supports output voltages up to 60V. The device features an adjustable switching frequency between 200kHz and 700kHz and delivers a maximum output current of 10A. It includes internal error amplifiers for precise regulation and supports both analog and PWM dimming methods. The component is housed in a 38-pin TSSOP-EP package and is rated for operation within a temperature range of -55°C to +150°C.

LED Driver IC Feature Summary

• Four-switch synchronous buck-boost topology enables seamless transition between buck, boost, and pass-through modes without external inductor saturation issues.
• Integrated dual error amplifiers allow independent control of LED string current and forward voltage limits for enhanced safety and flexibility.
• Supports both analog and pulse-width modulation (PWM) dimming interfaces for precise brightness control in lighting applications.

LED Driver IC Applications

• High-power LED lighting systems
• Automotive exterior and interior lighting
• Industrial illumination fixtures

LED Driver IC Procurement Notes

Verify the specific suffix (e.g., #PBF vs #TRPBF) against the required packaging format, as tube and tape-and-reel variants may have distinct ordering codes. Confirm availability status directly with authorized distributors, as some military-grade or extended temperature variants may be subject to limited distribution or obsolescence notices. Ensure the procurement channel provides valid RoHS compliance documentation matching the datasheet specifications.

LED Driver IC Selection Notes

Select this controller when input voltage fluctuations require a buck-boost solution rather than a simple buck or boost converter. The choice depends on the need for high efficiency across wide input ranges and the requirement for independent current and voltage limiting. Consider the thermal performance of the TSSOP-EP package and ensure adequate PCB layout for high-current paths. Verify that the application requires the specific 60V rating and 10A capability provided by this model.

LED Driver IC Part Context

The LT3791 belongs to Analog Devices' True Color PWM™ series of LED drivers, designed for applications requiring high color consistency and precise control. It is part of a family of high-voltage controllers intended for automotive and industrial markets where reliability under extreme conditions is critical. The MPFE variant typically denotes the military-grade temperature range extension compared to commercial equivalents.

LED Driver IC Replacement Considerations

Direct pin-to-pin replacements include the LT3791EFE#PBF for commercial grade applications. For tape-and-reel packaging requirements, consider the LT3791MPFE#TRPBF. Always verify electrical parameters and temperature ratings before substituting, as differences in operating ranges may affect system performance.