LT3667IUDD#PBF

Overview

The LT3667IUDD#PBF is a monolithic Buck switching regulator manufactured by Analog Devices Inc. It operates within an input voltage range of 4.3 V to 40 V and delivers up to 400 mA output current across three independent outputs, with a maximum regulated voltage of 38.6 V per channel. The device integrates a 2.2 MHz fixed switching frequency and supports a shutdown mode with a typical quiescent current of 40 uA. Designed for industrial applications, it functions reliably between -40°C and +125°C. The component utilizes a QFN-24 surface-mount package.

Feature Summary

• Integrates dual fault protection mechanisms for enhanced system reliability
• Features a high-efficiency synchronous Buck topology with internal power switches
• Supports flexible multi-output configurations via three independent channels

Applications

• Industrial control systems requiring isolated or non-isolated power distribution
• Automotive electronics operating within standard voltage ranges
• Embedded systems utilizing multiple voltage rails from a single source

Procurement Notes

Verify the specific suffix 'I' indicates the extended industrial temperature grade (-40°C to +125°C) compared to commercial variants. Confirm the '#PBF' designation ensures lead-free compliance and RoHS adherence as specified in the official datasheet. Cross-reference the manufacturer part number directly with Analog Devices documentation to ensure authenticity and correct revision level before procurement.

Selection Notes

Select this component when a compact solution is required for stepping down higher bus voltages to multiple lower rails. The 2.2 MHz frequency allows for smaller external passive components compared to lower-frequency regulators. Ensure the total load current across all three outputs does not exceed the thermal limits defined in the datasheet for the QFN-24 package under expected ambient conditions.

Part Context

This part belongs to the LT3667 family of triple-output step-down switching regulators. It shares functional similarities with the LT3667EUDD#PBF but differs in the guaranteed operating temperature range. The series is designed to replace older discrete solutions or linear regulators in space-constrained designs requiring efficient multi-rail power generation.

Replacement Considerations

LT3667EUDD#PBF serves as a direct pin-compatible alternative with a commercial temperature range. LT3667HUDD#PBF offers an extended junction temperature capability up to 150°C. Verify that any substitute maintains the same 40V input rating and 400mA per-channel current capacity.