LT3957IUHE#TRPBF

Overview

The LT3957IUHE#TRPBF is a monolithic switching regulator IC from Analog Devices, designed for versatile power conversion topologies including Boost, Flyback, SEPIC, and Inverting configurations. It integrates a high-voltage 40V switch capable of delivering up to 5A of output current. The device operates with an input voltage range spanning from 3V to 40V. Key electrical specifications include a fixed switching frequency of 1 MHz and a quiescent current of 1 µA during shutdown. It supports adjustable output voltages down to 1.6V and functions reliably within a junction temperature range of -40°C to +125°C.

Feature Summary

• Supports multiple converter topologies including boost, flyback, SEPIC, and inverting configurations
• Integrates a high-voltage 40V switch rated for 5A continuous current
• Features ultra-low shutdown quiescent current for extended battery life
• Operates at a fixed 1 MHz switching frequency for compact passive component sizing

Applications

• Battery-powered portable equipment requiring efficient step-up or inverted voltage regulation
• Industrial control systems utilizing isolated flyback power supplies
• Automotive electronics operating within wide input voltage ranges
• Telecommunications infrastructure requiring reliable DC-DC conversion

Procurement Notes

Verify the complete part number LT3957IUHE#TRPBF against official Analog Devices documentation to ensure correct suffixes for temperature grade (I) and tape-and-reel packaging (TRPBF). Confirm RoHS compliance status through the manufacturer's material declaration. Cross-reference the specific datasheet revision to validate pinout compatibility and electrical limits before integration into final designs.

Selection Notes

Select this component when designing circuits that require flexibility across multiple non-isolated and isolated topologies using a single controller. The integrated 40V/5A switch eliminates the need for external high-voltage MOSFETs in moderate power applications. Consider the 1 MHz switching frequency for trade-offs between efficiency and passive component size. Ensure the input voltage range aligns with the source supply characteristics and that thermal management accommodates the QFN-36 package dissipation requirements.

Part Context

This device belongs to the LT3957 series of high-voltage switching regulators manufactured by Analog Devices. It is part of a family designed to simplify power supply design by integrating high-voltage switches and control logic. The series targets applications needing robust performance in industrial, automotive, and communications environments where wide input voltage ranges and multiple topology options are required.

Replacement Considerations

Publicly confirmed substitute part numbers for LT3957IUHE#TRPBF were not identified in the provided reference data.