LT3581EDE#PBF

Overview

The LT3581EDE#PBF is a monolithic high voltage LED driver IC designed for driving strings of LEDs from a wide range of input voltages. It integrates a high-side N-channel power switch capable of handling up to 60V, allowing direct connection to automotive or industrial power supplies without external level shifting. The device operates in either constant current or constant voltage mode, featuring an internal 1.225V reference for precise regulation. It supports PWM dimming via the DIM pin and includes thermal shutdown protection. The part is housed in a thermally enhanced 16-lead SSOP package.

Feature Summary

• Integrates a high-voltage N-channel power switch for simplified circuit design
• Supports both constant current and constant voltage LED driving modes
• Enables low-noise PWM dimming control through a dedicated input pin

Applications

• Automotive exterior lighting systems including headlamps and taillamps
• Industrial general illumination fixtures requiring high input voltages
• Portable battery-powered lighting equipment with boost converter topologies

Procurement Notes

Verify the suffix PBF indicates lead-free compliance per RoHS standards. Confirm the DE package code matches the required 16-lead SSOP form factor. Ensure the operating temperature range aligns with your specific environmental constraints. Cross-reference the manufacturer's latest datasheet for any updated mechanical drawings or marking codes before finalizing procurement orders.

Selection Notes

Select this component when the application requires driving LED strings directly from high-voltage sources without complex gate drive circuits. It is suitable for designs needing integrated over-temperature protection and precise current regulation. Consider the maximum switch voltage rating relative to the peak inductor voltage spikes in your boost topology to ensure reliable operation under all load conditions.

Part Context

This device belongs to Analog Devices' family of high-voltage LED drivers. It complements lower voltage regulators by offering integrated switching capabilities. The series targets applications where board space is limited and external discrete switches are undesirable. It provides a robust solution for maintaining consistent LED brightness across varying input supply conditions.

Replacement Considerations

Direct replacements include other Analog Devices high-voltage LED drivers such as the LT3476 or LT3590 families, provided pin compatibility and electrical ratings match. Verify that substitute parts support the same 60V switch rating and SSOP package dimensions. Check for equivalent thermal performance and dimming interface requirements before substitution.