LT3508EUF#PBF

Overview

The LT3508EUF#PBF is a dual-channel monolithic step-down switching regulator manufactured by Analog Devices Inc. It operates with an input voltage range of 3.7V to 36V and provides two adjustable outputs, each capable of delivering up to 1.4A. The device utilizes a fixed 2.5MHz switching frequency to minimize external component size. It features a low quiescent current of 4.3mA and supports shutdown functionality. The component is housed in a 24-lead QFN package and is rated for operation between -40°C and +125°C.

Feature Summary

• Dual independent buck converters integrated into a single monolithic package
• Wide input voltage capability supporting high-voltage sources up to 36V
• High-frequency switching architecture reduces passive component footprint
• Integrated thermal regulation and protection mechanisms

Applications

• Industrial control systems requiring multiple isolated or non-isolated rails
• Automotive electronics operating on 12V or 24V bus architectures
• Distributed power supply architectures in telecommunications equipment
• Battery-powered devices requiring efficient voltage conversion from higher cell voltages

Procurement Notes

Verify the specific suffix against official Analog Devices documentation to confirm package type and temperature grade. Confirm RoHS compliance status through the manufacturer's material declaration. Check for obsolescence notices or PCNs that may affect long-term availability. Ensure the ordering part number matches the required pinout and thermal pad configuration for your PCB layout.

Selection Notes

Select this component when designing circuits that require two separate regulated outputs from a single high-voltage source. The fixed 2.5MHz frequency allows for smaller inductors compared to lower-frequency alternatives. Consider the 1.4A per channel limit when sizing traces and heatsinking. Verify that the input voltage never exceeds the maximum rating during transient conditions.

Part Context

This part belongs to the LT3508 family of dual synchronous buck regulators. It shares architectural similarities with other LT35xx series parts but is distinct in its dual-output topology and 36V input rating. Unlike single-output variants, it integrates two complete control loops and power stages within one enclosure to save board space.

Replacement Considerations

LT3508EFE#PBF