Analog Devices Inc. LT3694EFE#PBF

Overview

LT3694EFE#PBF from Analog Devices is a 36V monolithic power-management IC combining a 2.6A step-down regulator with two low-dropout linear regulator controllers. The device is built for automotive and industrial systems that need one efficient switching rail plus two auxiliary linear rails from a wide input supply.

As part of the LT3694 family, LT3694EFE#PBF provides current-mode buck conversion, dual LDO-controller outputs with programmable current limits, transient-tolerant input operation, adjustable switching frequency, power-good reporting, and compact thermally enhanced packaging. For engineers reviewing the LT3694EFE#PBF datasheet, LT3694EFE#PBF pinout, LT3694EFE#PBF application, or LT3694EFE#PBF equivalent, this device is widely used in automotive modules, industrial supplies, DSL and cable modems, distributed power regulation, and wall-transformer-powered embedded systems.

Technical Context

In automotive and industrial power trees, LT3694EFE#PBF operates as a wide-input buck regulator that creates a primary 2.6A rail while two LDO controllers generate cleaner secondary rails for analog, RF, sensor, or logic loads.

The 4V to 36V input range and overvoltage shutdown behavior through 70V transients make the architecture suitable for harsh supply environments. Adjustable frequency from 250kHz to 2.5MHz helps designers trade off EMI, efficiency, and external component size.

LT3694EFE#PBF is commonly selected for multi-rail systems where a single high-voltage input must feed a switching regulator and two current-limited linear post-regulated outputs without building three separate supply circuits.

Key Specifications

Pinout & Package

The LT3694EFE#PBF pinout combines buck power-stage pins, LDO-controller pins, feedback paths, frequency-setting control, power-good signaling, and thermal ground connections.

PCB layout should keep the buck switch loop tight, place LDO pass-device networks and output capacitors near their rails, and separate feedback traces from high dv/dt switching copper.

Key Features

• 2.6A buck regulator plus two LDO controllers reduce supply IC count.
• 4V to 36V input range supports automotive and industrial rails.
• 70V transient-related shutdown behavior improves harsh-input robustness.
• Programmable LDO current limits support protected auxiliary rails.
• 250kHz to 2.5MHz frequency range supports component and EMI optimization.
• Power-good output supports sequencing and system monitoring.

Applications

Equivalent & Alternatives

When evaluating a LT3694EFE#PBF equivalent, engineers should compare the 36V input rating, 2.6A buck output, dual LDO-controller structure, frequency range, package, and protection behavior.

Compared with LT3667HMSE#PBF, LT3694EFE#PBF is better suited when the design needs external-pass LDO-controller flexibility. LT3694EFE#PBF vs LT3507AEFE#PBF selection depends on whether the secondary rails should be low-noise linear outputs or additional switching outputs.

Quality

LT3694EFE#PBF should be sourced as original Analog Devices components through traceable and controlled supply channels. Quality checks may include package inspection, top-mark validation, solderability testing, and electrical verification of the buck and LDO-controller functions.

Production validation should include transient input behavior, buck stability, LDO current-limit behavior, thermal rise, output accuracy, and switching-layout review.

Availability

LT3694EFE#PBF available at Aetrix Electronics and is suitable for automotive, industrial, communication, and distributed power platforms requiring stable multi-rail supply support.

Supply support may include volume procurement planning, scheduled delivery arrangements, traceable sourcing management, and long-term supply support for OEM, industrial electronics, automotive electronics, and embedded product programs. Sample and NPI supply support, as well as urgent in-stock supply support, can also be arranged for prototype builds, pilot runs, and time-critical production needs.

For production builds, confirming package type, rail-current budget, pass-device selection, input transient requirements, lifecycle status, and sourcing continuity helps reduce procurement risk.

Manufacturer

Analog Devices is a global semiconductor manufacturer specializing in analog ICs, power management, mixed-signal products, data converters, RF solutions, sensors, and embedded signal-chain technologies for industrial, communication, automotive, healthcare, and consumer applications.

The LT3694 product family is a wide-input multi-output regulator series combining a 36V buck regulator with two LDO controllers for systems that need efficient primary conversion and low-noise auxiliary rails.

FAQ

What is LT3694EFE#PBF used for?

LT3694EFE#PBF is used for automotive modules, industrial power supplies, DSL/cable modems, and distributed power systems requiring a buck rail plus two LDO-controller rails.

Where can I find the LT3694EFE#PBF datasheet download?

The LT3694EFE#PBF datasheet is available from Analog Devices and includes regulator ratings, LDO-controller details, pin descriptions, and application circuits.

What should be considered in LT3694EFE#PBF pinout design?

Designers should keep the buck switch loop compact, route feedback nodes quietly, place LDO pass-device components close to the IC, and provide solid thermal grounding.

Does LT3694EFE#PBF include LDO controllers?

Yes. The LT3694 family includes two LDO regulator controllers with programmable current limits.

What are common LT3694EFE#PBF equivalent solutions?

Common candidates include LT3667HMSE#PBF and LT3507AEFE#PBF depending on whether the design needs linear auxiliary rails or additional switching outputs.