LT3431EFE#PBF

Overview

The LT3431EFE#PBF is a monolithic high voltage step-down DC/DC switching regulator manufactured by Analog Devices. It operates with an input voltage range of 7.5V to 20V and provides a fixed 5V output at up to 2A load current. The device integrates a 3A switch and operates at a fixed 500kHz switching frequency. It features current mode control for fast transient response and includes protection functions such as cycle-by-cycle current limiting, thermal shutdown, and soft-start. The component is housed in a 16-lead TSSOP package with an exposed pad.

Feature Summary

• Integrates a high-voltage N-channel power switch capable of handling peak currents up to 3A
• Utilizes constant-frequency current mode architecture for stable operation and simplified compensation
• Includes built-in thermal shutdown and cycle-by-cycle current limiting for robust system protection
• Features a precision internal oscillator allowing for precise timing without external components

Applications

• Point-of-load regulation for industrial equipment
• Power supply stages for automotive electronics within specified voltage ranges
• Battery-powered systems requiring efficient step-down conversion
• General-purpose high-voltage buck converter applications

Procurement Notes

Verify the specific suffix #PBF indicates lead-free RoHS compliance when ordering. Confirm the 16-lead TSSOP package availability through authorized distributors. Check for any recent lifecycle notices or obsolescence warnings from Analog Devices prior to finalizing procurement plans.

Selection Notes

Select this component for designs requiring a fixed 5V output from a 7.5V to 20V input source. Ensure the application load does not exceed the 2A continuous rating. Consider the 500kHz switching frequency for inductor size trade-offs. Verify that the operating temperature range meets the environmental requirements of the target system.

Part Context

This part belongs to the LT343x family of high-voltage buck converters from Analog Devices. It shares architectural similarities with other members like the LT3435 but differs in specific input voltage windows and output configurations. The family is designed for applications needing reliable step-down conversion in noisy or high-voltage environments.

Replacement Considerations

Direct pin-to-pin replacements may include other LT343x variants if input/output specifications align. Verify equivalent switching frequency and current ratings when substituting. Consult Analog Devices documentation for cross-reference lists to ensure functional compatibility.