LT3507AHUHF#PBF

Overview

The LT3507AHUHF#PBF is a monolithic power management IC featuring three current-mode DC/DC converters and one low-dropout linear regulator. It integrates two 1.8A buck switches, one 2.7A buck switch, and an LDO with external pass transistor capability. The device operates from a 4V to 36V input range with adjustable outputs from 0.8V to 32.4V. Switching frequency is programmable from 900kHz to 1.1MHz. It utilizes a 38-lead QFN package rated for -40°C to 150°C operation.

Feature Summary

• Inverted switching operation of the primary 2.7A output relative to auxiliary channels reduces input ripple current.
• Independent run, track/soft-start, and power-good pins simplify multi-rail power sequencing.
• All three switching regulators can be synchronized to a single external oscillator.
• Capable of driving ceramic capacitors directly to minimize system component count.

Applications

• Automotive electronic control units requiring multiple regulated rails
• Industrial automation systems with distributed power architectures
• Telecommunications base station power distribution networks
• Complex embedded systems needing precise voltage sequencing

Procurement Notes

Verify the specific suffix HUHF corresponds to the 38-lead QFN package variant when sourcing. Confirm that the 'A' grade designation meets the required temperature and performance specifications for the target application environment. Ensure compatibility with the intended PCB footprint and thermal pad requirements during procurement validation.

Selection Notes

Select this component for designs requiring integrated buck and LDO regulation within a compact form factor. The inverted topology is advantageous for applications sensitive to input noise. Consider the 38-pin QFN package constraints regarding thermal dissipation and soldering processes. Evaluate the need for external synchronization if operating in noisy electromagnetic environments.

Part Context

This part belongs to the LT3507 family of high-efficiency power management solutions. It combines switching regulators with a linear stage to provide versatile power delivery options. The family is designed for applications demanding high integration and reduced board space compared to discrete solutions.

Replacement Considerations

LT3507AEUHF#PBF offers identical electrical characteristics in a 38-lead TSSOP package. LT3507AHFE#PBF provides the same functionality in a 38-lead TSSOP-EP configuration. Verify pin-to-pin compatibility and thermal performance differences before substitution.