LT3791MPFE#TRPBF

LED Driver IC Overview

The LT3791MPFE#TRPBF is a synchronous, four-switch buck-boost LED driver controller from Analog Devices Inc. It operates with an input voltage range of 4.7 V to 60 V and supports output voltages up to 60 V. The device regulates LED current with ±6% accuracy for outputs between 0 V and 52 V. It features a fixed-frequency forced continuous current mode architecture with a switchable frequency range of 200 kHz to 700 kHz. The quiescent current is typically 3 mA. It is housed in a 38-lead TSSOP package with an exposed pad.

LED Driver IC Feature Summary

• Four-switch single inductor architecture enables seamless transition between buck, boost, and pass-through modes without upper MOSFET refresh cycles.
• Supports True Color PWM and analog dimming capabilities for precise light control applications.
• Integrated input and LED current monitors allow for accurate regulation and fault reporting including open or short circuit protection.

LED Driver IC Applications

• Automotive headlight and running light systems
• Industrial general lighting fixtures
• Battery-powered LED illumination systems

LED Driver IC Procurement Notes

Verify the specific suffix MPFE against official Analog Devices documentation to confirm military/extended temperature grade specifications. Ensure the #TRPBF designation matches the required tape and reel packaging format. Cross-reference the component marking with the datasheet silkscreen to prevent counterfeit substitution during assembly.

LED Driver IC Selection Notes

Select this controller when input voltage fluctuates significantly above, below, or near the LED string voltage. It is suitable for high-power applications exceeding 100 W where efficiency up to 98.5% is critical. Choose based on the required operating temperature range and the need for integrated fault protection mechanisms.

LED Driver IC Part Context

This component belongs to the LT3791 family of synchronous buck-boost controllers. The MPFE suffix indicates a specific temperature grade and package variant within the broader product line. It shares architectural similarities with other LT3791 variants but differs in environmental ratings and packaging configuration.

LED Driver IC Replacement Considerations

Direct substitutes include LT3791EFE#TRPBF and LT3791HFE#TRPBF. Verify that the alternative part number meets the required operating temperature range and pin compatibility before replacement.

LED Driver IC FAQ

Does the LT3791 require upper MOSFET refresh during buck or boost operation?

No, the four-switch architecture allows for seamless transitions without requiring upper MOSFET refresh cycles during buck or boost modes.

What is the maximum LED current accuracy specified for this controller?

The controller provides ±6% LED current accuracy for output voltages ranging from 0 V to 52 V.