LT3840IUFE#PBF

Overview

The LT3840IUFE#PBF is a high-voltage synchronous step-down switching regulator controller manufactured by Analog Devices Inc. It operates from an input voltage range of 2.5V to 60V and supports buck and inverting topologies. The device delivers up to 20A output current with a fixed 1MHz switching frequency. Quiescent current is specified at 6µA, while operating supply current is 20µA. Output voltage ranges from 1.25V to 60V. It features accurate current limit functionality and shutdown control. The component is housed in a 38-lead QFN (4x6) package and operates within a temperature range of -40°C to +125°C.

Feature Summary

• Supports wide input voltage range from 2.5V to 60V for flexible power system design
• Provides accurate current limit capability for robust load protection
• Enables synchronous rectification for improved efficiency in step-down applications

Applications

• Industrial power supplies requiring high input voltage tolerance
• Automotive electronics systems operating under variable line conditions
• Telecommunications infrastructure power distribution networks

Procurement Notes

Verify the specific suffix #PBF indicates lead-free packaging compliant with RoHS standards before procurement. Confirm that the QFN-38 package matches your PCB footprint requirements. Ensure the DC1909A development kit is available if hardware validation is required during the design phase. Cross-reference the manufacturer's latest datasheet to confirm pinout compatibility with existing designs.

Selection Notes

Select this controller when input voltages exceed standard low-voltage regulator limits but remain below 60V. The 1MHz switching frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the 20A current capability against peak load requirements. Evaluate thermal performance within the QFN-38 package constraints for high-current operation scenarios.

Part Context

This component belongs to the LT3840 series of high-voltage synchronous regulators. It serves as a controller rather than a complete integrated circuit, requiring external MOSFETs for power stage implementation. The series is designed for applications demanding wide input ranges and precise current management in compact form factors.

Replacement Considerations

LT3840IUFE#TRPBF offers identical electrical specifications but utilizes tape-and-reel packaging instead of tube packaging. Verify that the reel quantity aligns with assembly line requirements. No functional differences exist between the PBF and TRPBF suffixes regarding electrical performance.