LT3845EFE#TRPBF

Overview

The LT3845EFE#TRPBF is a high-voltage, synchronous current-mode step-down controller designed for medium to high-power applications. It features a wide input voltage range of 4V to 60V with a minimum start-up voltage of 7.5V. The device supports adjustable operating frequencies from 100kHz to 500kHz and can be synchronized up to 600kHz. Burst Mode operation reduces quiescent current to 120μA at light loads. It utilizes an onboard regulator for biasing directly from the input voltage and includes reverse inductor current inhibit functionality.

Feature Summary

• Synchronous current-mode control architecture for high efficiency
• Onboard regulator simplifies biasing requirements from VIN
• Burst Mode operation minimizes quiescent current at light loads
• Adjustable frequency with synchronization capability

Applications

• Industrial control systems
• Telecom power supplies
• Distributed power architectures

Procurement Notes

Verify the specific suffix TRPBF indicates tape-and-reel packaging when sourcing components. Confirm that the part number corresponds to the standard LT3845 variant rather than the LT3845A version, as internal specifications may differ between these series. Ensure the supplier provides documentation confirming the RoHS compliance status and lead-free pin plating details required for assembly processes.

Selection Notes

Select this component for designs requiring high input voltages up to 60V without external bootstrap circuits. The synchronous topology is suitable for applications demanding high efficiency across varying load conditions. Consider the thermal performance of the TSSOP-EP package and ensure adequate PCB copper area for heat dissipation. Verify that the chosen switching frequency aligns with electromagnetic interference constraints and passive component availability.

Part Context

This part belongs to the LT3845 family of high-voltage synchronous buck controllers manufactured by Analog Devices. It is functionally similar to the LT3845AIFE#TRPBF but represents the standard specification variant. The device is typically paired with demonstration boards like DC1619A for evaluation purposes. It serves as a core control element in DC/DC converter designs requiring robust performance in industrial environments.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.