LT3667IUDD

Overview

The LT3667IUDD is a triple-output switching regulator featuring one buck converter and two low-dropout linear regulators. It operates from an input voltage range of 4.3 V to 40 V with a maximum output current of 400 mA. The device integrates a 2.2 MHz fixed-frequency PWM controller for the buck section and includes dual fault protection mechanisms. It supports shutdown functionality and maintains operation across an industrial temperature range of -40°C to +125°C.

Feature Summary

• Integrates a high-efficiency synchronous buck converter alongside two independent LDOs within a single package
• Incorporates dual fault protection circuitry to enhance system reliability under abnormal conditions
• Features a fixed 2.2 MHz switching frequency to minimize external component size requirements

Applications

• Evaluation using the DC1869A demonstration board
• Development of compact power systems requiring multiple regulated rails
• Industrial control applications operating in harsh thermal environments

Procurement Notes

Verify the specific suffix (e.g., #PBF) against official Analog Devices documentation to confirm lead-free compliance and exact pinout configuration. Confirm availability status directly with authorized distributors, as supply constraints may apply. Ensure the selected variant matches the required thermal performance and packaging specifications for the target application.

Selection Notes

Select this component when a design requires three distinct voltage rails derived from a single wide-input source. The integrated topology reduces board space compared to discrete solutions. Verify that the total load current does not exceed the 400 mA limit shared by the buck converter and associated thermal management capabilities.

Part Context

This part belongs to the LT3667 family of mixed-signal power management ICs designed for space-constrained applications. It combines switching regulation efficiency with LDO noise performance. The device is manufactured by Analog Devices Inc. and utilizes a QFN-24 surface-mount package suitable for automated assembly processes.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.