LT3507AIFE

Overview

The LT3507AIFE is a monolithic DC/DC converter featuring three current-mode buck regulators and one low-dropout linear regulator. It accepts an input voltage range of 4V to 36V. The primary buck output delivers up to 2.7A, while two auxiliary buck channels provide 1.8A each. The integrated LDO utilizes external transistors for additional regulation. The device supports adjustable switching frequencies from 250kHz to 2.5MHz and operates within a temperature range of -40°C to +125°C. It is housed in a 38-lead TSSOP package with an exposed pad.

Feature Summary

• Inverts the primary 2.7A buck switch operation relative to the other converters to minimize input ripple current.
• Integrates independent enable, tracking/soft-start, and power-good indicators to simplify multi-rail power sequencing.
• Supports synchronous rectification across the entire frequency range using internal or external control signals.
• Allows use of ceramic capacitors on all outputs to reduce system component count and cost.

Applications

• Automotive electronic systems requiring multiple regulated voltage rails
• Industrial control equipment with distributed power architectures
• Communication infrastructure power management modules

Procurement Notes

Verify the specific suffix against official Analog Devices documentation to confirm package type and tape/reel specifications. Ensure the ordering part number matches the required thermal performance and pin configuration. Cross-reference the datasheet revision date to confirm compatibility with current design requirements. Confirm RoHS compliance status through manufacturer declarations prior to integration.

Selection Notes

Select this component when a single IC solution is needed for generating three buck voltages and one linear rail from a wide input range. The inverted switching phase of the main channel makes it suitable for applications sensitive to input current ripple. Consider the 38-pin TSSOP-EP package for thermal dissipation needs in space-constrained designs requiring high current density.

Part Context

This part belongs to the LT3507A family of triple-buck converters with an integrated LDO. It is designed for applications requiring high efficiency and simplified board layout. The family offers various package options including QFN and TSSOP variants to suit different thermal and spatial constraints in power supply designs.

Replacement Considerations

LT3507AEFE#PBF: Same functionality in tube packaging. LT3507AHFE#PBF: Higher temperature grade variant. LT3507AHUHF#PBF: QFN package alternative. Verify pinout and thermal pad connections when substituting packages.