LT3958IUHE

Overview

The LT3958IUHE#TRPBF is a high-performance switching regulator IC from Analog Devices, designed for versatile power conversion topologies including boost, flyback, SEPIC, and inverting configurations. It features a wide input voltage range of 5V to 80V and supports adjustable output voltages up to 84V. The device delivers a maximum switch current of 3.3A with an integrated synchronous rectifier structure. Operating at a fixed switching frequency of 1MHz, it offers efficient power management within a compact 36-lead QFN package rated for industrial temperatures between -40°C and +125°C.

Feature Summary

• Supports multiple non-isolated DC/DC converter topologies including boost, Cuk, flyback, SEPIC, and inverting configurations.
• Integrates a high-voltage switch capable of handling input voltages up to 80V and delivering up to 3.3A of switch current.
• Features a fixed 1MHz switching frequency to minimize external passive component size while maintaining regulation stability.
• Includes internal compensation and protection mechanisms such as cycle-by-cycle current limiting and thermal shutdown.

Applications

• Industrial control systems requiring isolated or non-isolated power rails
• Automotive electronics operating within wide input voltage ranges
• Telecommunications infrastructure power distribution units
• Battery-powered equipment utilizing SEPIC or inverting topologies

Procurement Notes

Verify the complete ordering part number, specifically the suffix #TRPBF, which indicates tape-and-reel packaging and lead-free compliance. Confirm availability status as supply constraints may apply to specific manufacturing lots. Ensure the requested quantity matches the reel specifications if bulk procurement is required. Cross-reference the manufacturer's latest datasheet for any recent design revisions or recommended footprint updates prior to finalizing purchase orders.

Selection Notes

Select this component when designing circuits that require flexibility across multiple converter topologies without changing the primary controller IC. The 1MHz fixed frequency is optimal for applications prioritizing small passive component footprints over variable frequency noise spreading. Ensure the application's peak current demands do not exceed the 3.3A limit under worst-case thermal conditions. Consider the 36-lead QFN package for thermal dissipation requirements and PCB space constraints compared to larger packages.

Part Context

The LT3958 belongs to Analog Devices' portfolio of high-voltage switching regulators designed for complex power architectures. It serves as a versatile alternative to dedicated single-topology controllers by integrating the necessary drive circuitry for boost, flyback, and inverting modes within a single chip. This integration reduces bill-of-materials complexity in multi-rail systems where different conversion types are needed from a common high-voltage bus.

Replacement Considerations

Public confirmed substitute part numbers: LT3958EUHE#TRPBF (Commercial temperature grade variant).