LT3957AIUHE#PBF

Overview

The LT3957AIUHE#PBF is a wide input range, current mode DC/DC converter capable of generating positive or negative output voltages. It integrates an internal low-side N-channel power MOSFET rated for 40V and 5A, driven by a regulated 5.2V supply. The device supports boost, flyback, SEPIC, and inverting topologies with a fixed frequency architecture. Input voltage ranges from 3V to 40V, while the switching frequency operates at 1MHz. Quiescent current is 1µA, and the operating temperature range extends from -40°C to +125°C.

Feature Summary

• Integrates a 40V, 5A low-side N-channel power MOSFET driven by an internal regulated supply
• Supports multiple converter topologies including boost, flyback, SEPIC, and inverting configurations
• Fixed frequency current-mode architecture ensures stable operation across wide input and output voltage ranges

Applications

• Industrial control systems requiring isolated or non-isolated power conversion
• Automotive electronics utilizing wide input voltage ranges
• Telecommunications infrastructure power supplies
• Battery-powered equipment needing efficient step-up or inversion

Procurement Notes

Verify the specific suffix 'IUHE' indicates the industrial temperature grade (-40°C to +125°C) and QFN-36 package configuration. Confirm RoHS compliance status through official Analog Devices documentation. Ensure compatibility with the DC1544A development kit if evaluation is required. Cross-reference datasheet revisions to confirm pinout and electrical characteristics match design requirements.

Selection Notes

Select this component when a monolithic solution integrating a high-current switch is required for boost, flyback, SEPIC, or inverting applications. The wide input range accommodates various source voltages, while the integrated MOSFET simplifies thermal management compared to discrete designs. Consider the 1MHz switching frequency for balancing efficiency and passive component size against electromagnetic interference constraints.

Part Context

The LT3957A belongs to a family of versatile DC/DC converters designed for flexibility in topology selection. Unlike dedicated controllers, it includes the power switch internally, reducing external component count. The AIUHE#PBF designation specifies the industrial temperature variant housed in a QFN-36 package, distinguishing it from commercial grade or alternative packaging options within the same functional series.

Replacement Considerations

LT3957EUHE#PBF serves as a commercial grade equivalent with identical electrical specifications but a limited operating temperature range. Verify thermal requirements before substitution. No direct pin-compatible upgrades are documented; redesign may be necessary for higher performance variants.