LT3957IUHE#PBF

Overview

The LT3957IUHE#PBF is a high-efficiency, current-mode DC-DC converter manufactured by Analog Devices Inc. It supports Boost, Flyback, SEPIC, and Inverting topologies within a single compact package. The device operates with an input voltage range of 3 V to 40 V and delivers up to 5 A output current at 40 V. It features a fixed 1 MHz switching frequency and ultra-low quiescent current of 1 uA. The component is housed in a QFN-36 surface-mount package and functions reliably across an extended temperature range from -40°C to +125°C.

Feature Summary

• Supports multiple power conversion topologies including boost, flyback, SEPIC, and inverting configurations
• Integrates a fixed 1 MHz current-mode controller for simplified design and stable operation
• Features ultra-low shutdown current to maximize battery life in portable applications
• Provides comprehensive protection mechanisms including thermal regulation and cycle-by-cycle current limiting

Applications

• Battery-powered industrial equipment requiring efficient step-up or inverted voltage rails
• Automotive electronics operating within wide input voltage ranges
• Portable medical devices needing low standby power consumption
• Telecommunications infrastructure utilizing SEPIC or flyback architectures

Procurement Notes

Verify the specific suffix 'IUHE' corresponds to the industrial temperature grade (-40°C to +125°C) and RoHS compliance status as defined in the official datasheet. Confirm that the QFN-36 package variant matches your PCB footprint requirements. Cross-reference the manufacturer part number with authorized distributors to ensure authenticity and traceability before finalizing procurement orders.

Selection Notes

Select this component when designing systems requiring flexible topology options such as SEPIC or inverting converters alongside standard boost functionality. The fixed 1 MHz frequency allows for smaller passive components compared to lower-frequency alternatives. Ensure the application input voltage remains within the 3 V to 40 V range and that the load current does not exceed the 5 A limit under all operating conditions.

Part Context

This part belongs to the LT3957 family of high-voltage DC-DC converters designed for versatile power management solutions. It shares architectural similarities with other Analog Devices current-mode controllers but distinguishes itself through its multi-topology capability and ultra-low quiescent current specifications. The series targets applications demanding high efficiency and minimal standby power drain.

Replacement Considerations

LT3957EUHE#PBF: Publicly confirmed substitute offering identical electrical performance and pinout compatibility.