Analog Devices Inc. LT3667IUDD#PBF

Overview

LT3667IUDD#PBF from Analog Devices is a 40V triple power supply combining a 400mA step-down regulator with two 200mA fault-protected LDO regulators. The device is designed for automotive and industrial systems that need one efficient switching rail plus protected low-noise auxiliary rails from a wide input source.

As part of the LT3667 family, LT3667IUDD#PBF integrates a high-voltage buck regulator, dual programmable-current-limit LDOs, low-ripple Burst Mode operation, power-good indicators, and protection features for field-connected or battery-powered rails. For engineers reviewing the LT3667IUDD#PBF datasheet, LT3667IUDD#PBF pinout, LT3667IUDD#PBF application, or LT3667IUDD#PBF equivalent, this device is widely used in automotive battery regulation, industrial supplies, portable instrumentation, protected sensor rails, field-wiring interfaces, and compact triple-output embedded power systems.

Technical Context

In automotive and industrial boards, LT3667IUDD#PBF operates as a triple-output supply that creates one switching regulator rail and two post-regulated LDO rails from a high-voltage input.

The two 200mA LDO outputs are useful for cleaner sensor, analog, or auxiliary loads, and their fault-protected behavior helps when external connections or field wiring can expose rails to abnormal conditions.

LT3667IUDD#PBF is commonly selected where low standby current, wide input range, fault-protected LDO rails, and a compact package are required for a three-rail power tree.

Key Specifications

Pinout & Package

The LT3667IUDD#PBF pinout includes buck input, switch, boost, feedback, LDO input/output, run/UVLO, power-good, and ground/thermal pins.

For PCB design, buck current loops should be compact, LDO capacitors should be close to the output pins, and protected output traces should be routed with expected fault conditions in mind.

Key Features

• One buck plus two protected LDO rails support compact triple-output supplies.
• 40V input range fits automotive and industrial systems.
• LDO current limits support protected sensor rails.
• Low-ripple Burst Mode improves light-load efficiency.
• Power-good and UVLO functions support sequencing.
• Protection functions improve field reliability.

Applications

Equivalent & Alternatives

When evaluating a LT3667IUDD#PBF equivalent, engineers should compare input range, buck current, LDO current, fault protection, package, switching frequency, and low-load current.

Compared with LT3694EFE#PBF, LT3667IUDD#PBF provides integrated fault-protected LDO outputs instead of external LDO controller rails. LT3667IUDD#PBF vs TPS65321QPWPRQ1 selection depends on rail count, LDO protection, current budget, package, and automotive or industrial requirements.

Quality

LT3667IUDD#PBF should be sourced as original Analog Devices components through traceable channels. Quality checks may include package inspection, top-mark validation, solderability testing, and buck/LDO electrical verification.

Production validation should include startup behavior, LDO current-limit behavior, output accuracy, load transients, fault exposure, thermal performance, and switching-layout review.

Availability

LT3667IUDD#PBF available at Aetrix Electronics and is suitable for automotive, industrial, sensor, instrumentation, and compact embedded triple-output power systems.

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, temperature grade, rail-current budget, protection needs, 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 LT3667 product family is a high-voltage triple-output power-supply series integrating a step-down regulator with two fault-protected LDO regulators for automotive and industrial power rails.

FAQ

What is LT3667IUDD#PBF used for?

LT3667IUDD#PBF is used for automotive, industrial, sensor, and instrumentation systems requiring a buck regulator and two fault-protected LDO rails.

Where can I find the LT3667IUDD#PBF datasheet download?

The LT3667IUDD#PBF datasheet is available from Analog Devices and includes electrical ratings, package data, pin descriptions, and application circuits.

What should be considered in LT3667IUDD#PBF pinout design?

Designers should keep the buck switching loop compact, place LDO capacitors close, and route protected output rails according to expected fault conditions.

Does LT3667IUDD#PBF include fault-protected LDO regulators?

Yes. The LT3667 family includes two 200mA fault-protected LDO regulators.

What are common LT3667IUDD#PBF equivalent solutions?

Common candidates include LT3694EFE#PBF and TPS65321QPWPRQ1 depending on LDO architecture, rail count, current rating, and package.