LT3840MPFE

Overview

The LT3840MPFE#PBF is a high-voltage synchronous step-down switching regulator controller from Analog Devices. It operates from a 2.5V to 60V supply and supports Buck and Inverting topologies. The device delivers up to 20A output current with a fixed 1MHz switching frequency. Input voltage ranges from 2.5V to 60V, while output voltage spans 1.25V to 60V. Quiescent current is 6µA, with operating supply current at 20µA. It features accurate current limit and shutdown control. The component is housed in a TSSOP-EP-28 package and functions within a temperature range of -55°C to +150°C.

Feature Summary

• Supports Buck and Inverting converter topologies for flexible power design
• Includes accurate current limit functionality for robust protection
• Enables low standby power consumption through ultra-low quiescent current operation

Applications

• Industrial power supplies requiring wide input voltage ranges
• Automotive electronics systems
• Distributed power architectures
• Point-of-load regulation modules

Procurement Notes

Verify the specific suffix #PBF indicates lead-free packaging compliance when sourcing. Confirm that the MP prefix denotes military-grade qualification requirements against standard commercial variants. Ensure the TSSOP-EP-28 thermal pad connection is properly implemented on the PCB layout for adequate heat dissipation during high-current operation.

Selection Notes

Select this controller for applications demanding high input voltages up to 60V. The 1MHz frequency allows for smaller external passive components compared to lower-frequency alternatives. Consider the extended temperature range for harsh environments. Evaluate the need for military-grade reliability versus standard industrial specifications before finalizing the part number selection.

Part Context

This component belongs to the LT3840 family of synchronous buck regulators. It serves as a controller rather than an integrated switch, requiring external MOSFETs. The series is designed for high-efficiency power conversion in space-constrained designs. The EP package variant provides enhanced thermal performance for sustained high-power applications.

Replacement Considerations

LT3840EFE#PBF

FAQ

What switching frequencies are supported by the LT3840MPFE?

The device operates at a fixed 1MHz switching frequency.

Does the LT3840MPFE include internal power switches?

No, it is a controller that requires external N-channel MOSFETs for the synchronous rectification and high-side switching stages.