LT3955IUHE#PBF

LED Driver IC Overview

The LT3955IUHE#PBF is a high-efficiency LED driver IC from Analog Devices, designed for single-output flyback or SEPIC topologies. It operates with an input voltage range of 4.5V to 60V and supports a maximum switch current of 3.5A. The device integrates an internal PWM generator for dimming control and functions within a switching frequency range of 100kHz to 1MHz. Packaged in a 36-lead QFN (5mm x 5mm) with an exposed thermal pad, it ensures reliable operation across temperatures from -40°C to +125°C.

LED Driver IC Feature Summary

• Integrates an internal PWM generator for precise digital dimming control without external components
• Supports flexible flyback and SEPIC converter topologies for isolated and non-isolated LED applications
• Features wide input voltage capability suitable for various power supply architectures

LED Driver IC Applications

• High-power LED lighting systems requiring isolated topologies
• Industrial LED drivers utilizing SEPIC configurations
• Automotive exterior lighting modules

LED Driver IC Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and tube packaging when sourcing. Confirm the manufacturer is Analog Devices Inc. Ensure the package matches the 36-lead QFN specification. Check for recent datasheet updates regarding electrical characteristics before finalizing procurement.

LED Driver IC Selection Notes

Select this component for designs requiring integrated PWM dimming and high input voltage tolerance. The 3.5A switch current rating suits moderate-to-high power LED strings. Consider the QFN package for thermal management requirements in compact enclosures compared to larger packages.

LED Driver IC Part Context

This part belongs to the LT3955 series of LED drivers. It shares the core architecture with variants like the LT3955EUHE but differs in temperature grade and packaging. The series targets efficient constant-current regulation for solid-state lighting applications.

LED Driver IC Replacement Considerations

LT3955EUHE#PBF is a verified alternative within the same family, differing primarily in operating temperature range and package type. Verify pin compatibility and thermal performance when substituting.

LED Driver IC FAQ

Does the LT3955IUHE#PBF require an external oscillator?

No, the device includes an internal oscillator that can be set via an external resistor, supporting frequencies from 100kHz to 1MHz.

What is the maximum switch current capability?

The internal switch supports a peak current of up to 3.5A, allowing for high-power LED driving capabilities.