LT3757IDD#PBF

Overview

The LT3757IDD#PBF is a DC/DC switching controller from Analog Devices Inc., designed for boost, flyback, SEPIC, and inverting topologies. It operates with an input voltage range of 2.9V to 40V and supports a switching frequency between 100kHz and 1MHz. The device features clock synchronization, soft start, and enable control. Packaged in a 10-WFDFN (3x3) exposed pad surface-mount package, it functions within a temperature range of -40°C to +125°C TJ.

Feature Summary

• Supports multiple converter topologies including boost, flyback, SEPIC, and inverting configurations
• Enables external clock synchronization for noise immunity and multi-phase operation
• Integrates programmable soft start and shutdown functionality for controlled power sequencing

Applications

• Industrial power supplies requiring isolated or non-isolated regulation
• Battery-powered systems utilizing boost or buck-boost architectures
• Automotive electronics operating within wide input voltage ranges
• Telecommunications equipment needing negative output generation

Procurement Notes

Verify the specific suffix #PBF indicates lead-free tape and reel or tube packaging as per manufacturer standards. Confirm that the IDD variant matches the required thermal performance and pinout for your PCB layout. Cross-reference the datasheet revision date to ensure compatibility with current design specifications and regulatory requirements.

Selection Notes

Select this component when designing circuits requiring flexible topology support beyond standard buck or boost converters. The wide input voltage range suits applications with varying source conditions. Ensure the external inductor and capacitor values are calculated to maintain stability across the full 100kHz to 1MHz frequency range while meeting ripple current requirements.

Part Context

This part belongs to the LT3757 family of wide input range, current mode DC/DC controllers. These devices are engineered to generate positive or negative output voltages using external switches. The family includes variants like LT3757A for enhanced performance, all sharing core control logic but differing in electrical characteristics and packaging options.

Replacement Considerations

LT3757AIDD#PBF offers potential upgrades within the same family. Verify if the A-grade variant provides necessary improvements in accuracy or thermal handling. Direct substitution requires checking pin compatibility and ensuring the new part meets all original electrical constraints without redesigning the passive components.