LT3840IUFE#TRPBF

Overview

The LT3840IUFE#TRPBF is a high-voltage synchronous step-down switching regulator controller from Analog Devices Inc., designed for robust power management in demanding environments. It supports an input voltage range of 2.5V to 60V and delivers up to 20A output current with a single output channel. Operating at a fixed switching frequency of 1MHz, the device ensures efficient energy conversion across wide load variations. The component functions within a temperature range of -40°C to +125°C, utilizing a QFN-38 package for compact surface-mount integration. Its low quiescent current of 20µA enhances system efficiency during standby modes.

Feature Summary

• Supports both positive and negative output configurations via buck or inverting topologies
• Features accurate current limit protection for reliable operation under fault conditions
• Enables synchronization to an external clock for noise reduction and phase alignment

Applications

• Industrial automation power supplies requiring wide input ranges
• Telecommunications infrastructure equipment
• Distributed power systems in computing hardware
• Battery-powered devices needing efficient step-down regulation

Procurement Notes

Verify the specific suffix #TRPBF indicates tape-and-reel packaging when ordering. Confirm that the I grade denotes industrial temperature rating compliance. Ensure compatibility with the DC1909A evaluation kit if initial testing is required. Check local distributor availability as stock levels may vary by region. Validate RoHS compliance status through official manufacturer documentation prior to final procurement decisions.

Selection Notes

Choose this controller for applications requiring high input voltages up to 60V with precise current limiting. Consider the 1MHz switching frequency for balancing efficiency and component size. Evaluate thermal performance given the QFN-38 package constraints. Ensure external MOSFET selection matches the 20A current capability and voltage ratings. Verify that the control loop compensation network aligns with the target output voltage range of 1.25V to 60V.

Part Context

This component belongs to the LT3840 series of synchronous regulator controllers. It is part of Analog Devices' portfolio of PMIC solutions focused on high-voltage DC-DC conversion. The device complements other Linear Technology heritage products designed for rugged industrial and telecom applications. It shares functional similarities with adjacent models in the family but offers specific input/output characteristics tailored for wide-range power systems.

Replacement Considerations

Direct substitutes include other Analog Devices synchronous buck controllers with similar input voltage ranges. Verify pinout compatibility before replacing with alternative part numbers. Cross-reference electrical specifications such as quiescent current and switching frequency to ensure equivalent performance. Consult official replacement guides for any discontinued variants within the LT3840 lineage.