LT3791IFE#PBF

LED Driver IC Overview

The LT3791IFE#PBF is a synchronous four-switch buck-boost LED driver controller from Analog Devices. It supports input voltages from 4.7V to 60V and regulates output voltage up to 60V or current for LED strings. The device operates with a switching frequency range of 200kHz to 700kHz and features a typical quiescent current of 3mA. It is housed in a 38-lead TSSOP-EP package and functions within an operating temperature range of -40°C to +125°C.

LED Driver IC Feature Summary

• Synchronous four-switch topology enables efficient buck, boost, and buck-boost operation across wide input and output voltage ranges.
• Supports both analog and PWM dimming methods for precise LED brightness control.
• Integrated regulation capabilities allow for accurate control of LED string current and voltage.

LED Driver IC Applications

• High-power LED lighting systems
• Automotive exterior lighting applications
• Industrial illumination drivers

LED Driver IC Procurement Notes

Verify the specific suffix '#PBF' indicates lead-free packaging when sourcing. Confirm that the 'IFE' designation corresponds to the industrial temperature grade (-40°C to +125°C) required for your application environment. Ensure compatibility with the 38-TSSOP-EP footprint during PCB layout. Cross-reference the manufacturer's latest datasheet for any updates on recommended operating conditions or thermal requirements.

LED Driver IC Selection Notes

Select this component for designs requiring a single IC to handle varying input voltages relative to the LED string voltage. It is suitable for applications needing high efficiency across wide dynamic ranges. Consider the 38-pin package size if board space permits. Evaluate the need for external MOSFETs capable of handling the expected peak currents and voltage stresses associated with the 60V maximum rating.

LED Driver IC Part Context

This part belongs to the LT3791 family of synchronous buck-boost controllers. It is distinct from variants like the LT3791EFE (extended temperature) or LT3791MPFE (military grade). The standard IFE version provides industrial-grade performance. It serves as a core control element for non-isolated LED drivers, differing from linear regulators by offering higher efficiency through switching topologies.

LED Driver IC Replacement Considerations

Direct substitutes include LT3791EFE#PBF for extended temperature needs. For military specifications, consider LT3791MPFE#PBF. Generic replacements are not recommended due to specific pinout and control logic dependencies. Always verify electrical parameters against the original design requirements before swapping.