LT3587EUD

Overview

The LT3587EUD is a monolithic step-down switching regulator manufactured by Analog Devices Inc., designed for high-efficiency power conversion in space-constrained applications. It integrates a 42V N-channel MOSFET switch and operates from an input voltage range of 2.7V to 42V. The device supports adjustable output voltages down to 0.8V with a maximum output current capability of 1.5A. Key electrical parameters include a fixed switching frequency of 500kHz, which allows for the use of small external components. The IC features cycle-by-cycle current limiting, thermal shutdown, and soft-start functionality to ensure robust operation under various load conditions.

Feature Summary

• Integrates a high-voltage 42V N-channel power switch for simplified design
• Supports wide input voltage range suitable for industrial and automotive sources
• Includes programmable soft-start to limit inrush current during startup
• Provides comprehensive protection against over-current and excessive temperature

Applications

• Industrial point-of-load regulation
• Automotive electronics power distribution
• Battery-powered equipment with wide input ranges
• General-purpose DC-DC conversion modules

Procurement Notes

Verify the specific suffix 'EUD' corresponds to the TSSOP-16 package variant when sourcing. Confirm RoHS compliance status through official manufacturer documentation or authorized distributor declarations prior to integration. Ensure the ordering part number matches the exact temperature grade and packaging format required for your production line to avoid compatibility issues with assembly processes.

Selection Notes

Select this component when a single-inductor solution is preferred over multi-phase designs for moderate current requirements up to 1.5A. The fixed 500kHz frequency offers a balance between efficiency and component size. Consider the thermal performance of the TSSOP-16 package relative to your PCB copper area, as adequate heat dissipation is critical for maintaining reliability at higher load currents or elevated ambient temperatures.

Part Context

The LT3587 belongs to Analog Devices' family of high-voltage step-down regulators. It complements other parts like the LT3586 and LT3588 by offering a specific combination of input voltage tolerance and output current capacity. This series is engineered for applications requiring reliable power delivery from unstable or high-voltage sources without the complexity of discrete switch implementations.

Replacement Considerations

Direct pin-compatible alternatives within the same family include the LT3586 (lower current) and LT3588 (higher current). Verify that any substitute maintains the 42V switch rating and similar control loop characteristics to ensure circuit stability without extensive redesign.