LT3504IUFD#PBF

Overview

The LT3504IUFD#PBF is a monolithic synchronous buck switching regulator featuring four independent channels, each capable of delivering 1A output current. It operates with an input voltage range from 3.2V to 40V and supports adjustable output voltages. The device utilizes a fixed 2.2MHz switching frequency and includes integrated power switches. Key electrical specifications include a maximum quiescent current of 2.7mA and a shutdown supply current of 10nA. It functions within an operating temperature range of -40°C to +125°C and is housed in a 28-lead QFN package.

Feature Summary

• Integrates four independent 1A synchronous buck regulators in a single compact package
• Supports 100% duty cycle operation for minimal dropout voltage requirements
• Features low shutdown supply current to extend battery life in standby modes
• Includes internal compensation and soft-start functionality for simplified design

Applications

• Industrial systems requiring multiple regulated voltage rails
• Automotive electronics operating on 12V or 24V bus architectures
• Distributed power distribution networks
• Telecommunications infrastructure equipment

Procurement Notes

Verify the specific suffix against official Analog Devices documentation to confirm temperature grade and packaging configuration. Ensure compatibility with the intended thermal management solution given the QFN-28 form factor. Confirm RoHS compliance status through the manufacturer's latest material declaration. Cross-reference the part number with authorized distributors to validate authenticity and traceability before finalizing procurement orders.

Selection Notes

Select this component when designing systems that require four separate 1A outputs from a single high-voltage source. The 2.2MHz frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the thermal performance of the QFN-28 package relative to the expected load conditions. Evaluate the need for external synchronization if noise immunity is critical in the target application environment.

Part Context

This part belongs to the LT3504 family of multi-channel DC/DC converters designed by Analog Devices. It is distinct from single-output regulators like the LTC3404 or mixed-mode devices such as the LT3694. The IUFD suffix indicates an industrial temperature range variant packaged in a tube format. It serves as a high-density power solution for applications needing multiple isolated or non-isolated rails.

Replacement Considerations

LT3504EUFD#PBF is a confirmed commercial grade substitute with identical pinout and electrical characteristics.