LT3957AEUHE#PBF

Overview

The LT3957AEUHE#PBF is a wide input range, current mode DC/DC converter capable of generating positive or negative output voltages. It can be configured as a boost, flyback, SEPIC, or inverting converter. The device features an internal low-side N-channel power MOSFET rated for 40V at 5A, driven by an internal regulated 5.2V supply. Operating parameters include an input voltage range of 3V to 40V, a fixed switching frequency of 1MHz, and a quiescent current of 1uA. It supports operation over a temperature range of -40°C to +125°C and utilizes a QFN-36 package.

Feature Summary

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

Applications

• Boost converter designs
• Flyback converter implementations
• SEPIC topology applications
• Inverting converter circuits

Procurement Notes

Verify the specific suffix 'EUHE' against the manufacturer's official documentation to confirm pinout compatibility and thermal pad specifications. Ensure that the operating conditions align with the absolute maximum ratings defined in the datasheet. Cross-reference the manufacturing date code and lot information to guarantee component authenticity and traceability before integration into production systems.

Selection Notes

Select this component when a single-chip solution is required for versatile DC/DC conversion topologies. It is suitable for applications demanding high peak current handling from an integrated switch. Consider the fixed 1MHz frequency for passive component sizing. Evaluate the thermal performance requirements given the QFN-36 package and the power dissipation associated with the internal MOSFET under load.

Part Context

This part belongs to the LT3957 series of wide input voltage range converters. It shares architectural similarities with other devices in the family but is distinguished by its specific internal switch ratings and fixed frequency operation. The series is designed for flexible power management solutions requiring both positive and negative output generation capabilities within a compact surface-mount footprint.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify functional equivalence carefully if considering alternatives, specifically matching the 40V/5A switch rating, 1MHz frequency, and QFN-36 package dimensions.