LT3507IUHF

Overview

The LT3507IUHF is a quad-output power management IC featuring three synchronous buck converters and one low-dropout linear regulator. It operates with an input voltage range of 4V to 36V. The primary buck output delivers up to 2.7A, while the two secondary buck outputs provide 1.8A each. The switching frequency is adjustable from 900kHz to 1.1MHz. The device utilizes a 38-lead QFN package measuring 5mm by 7mm with an exposed thermal pad for enhanced heat dissipation.

Feature Summary

• Integrates three current-mode buck converters and one LDO in a single compact package
• Features inverted switching operation between the main and auxiliary outputs to minimize input ripple current
• Includes independent run, track/soft-start, and power-good indicators to simplify multi-rail power sequencing

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 'IUHF' against official Analog Devices documentation to confirm the industrial temperature grade and QFN package configuration. Ensure compatibility with the required thermal design and PCB layout specifications for the 38-lead form factor before finalizing procurement orders.

Selection Notes

Select this component when a high-density solution is needed for automotive or industrial applications requiring four distinct voltage rails. The wide input voltage range accommodates various supply sources, while the integrated sequencing features reduce external component count compared to discrete solutions.

Part Context

This part belongs to the LT3507 family of quad-output regulators designed for space-constrained environments. It combines switching efficiency with linear regulation precision. The IUHF designation indicates the industrial temperature rating and the specific 38-QFN package variant offered by Analog Devices Inc.

Replacement Considerations

LT3507AEUHF#PBF

FAQ

How does the LT3507IUHF manage input ripple?

The device employs an inverted switching operation where the 2.7A output runs out of phase with the two 1.8A outputs, effectively canceling input ripple currents.

What is the function of the Track/Soft-Start pin?

It allows for programmable soft-start timing and enables tracking of other power supplies to ensure proper power-up sequencing in multi-rail systems.