LTC3807MPFE#PBF

DC DC Switching Controllers Overview

The LTC3807MPFE#PBF is a military-grade, low quiescent current synchronous step-down DC/DC controller manufactured by Analog Devices Inc. It is designed to drive an external N-channel power MOSFET stage in a buck topology. The device supports a wide input voltage range from 4V to 38V and provides an adjustable output voltage capability up to 24V. Key electrical specifications include a maximum output current of 25A, a static current of 50µA, and a programmable switching frequency ranging from 105kHz to 835kHz. It operates within a junction temperature range of -55°C to +125°C and is housed in a 20-lead TSSOP-EP package.

DC DC Switching Controllers Feature Summary

• Features a constant frequency current mode architecture with a lockable phase frequency for multi-phase synchronization.
• Incorporates OPTI-LOOP compensation to optimize transient response across a wide range of output capacitance and ESR values.
• Supports multiple light-load operating modes including continuous conduction, pulse skip, and low ripple Burst Mode operation.
• Provides comprehensive protection features including output overvoltage protection, current foldback during short circuits, and soft-start functionality.

DC DC Switching Controllers Applications

• Military and aerospace systems requiring extended temperature ranges and high reliability
• Battery-powered digital devices requiring low quiescent current for extended operation time
• Distributed DC power systems with wide input voltage variations
• Automotive always-on systems compatible with various battery chemistries

DC DC Switching Controllers Procurement Notes

Verify the specific suffix 'MPFE' indicates the military grade variant (-55C to +125C) rather than the commercial grade. Confirm RoHS compliance status as military parts may have different environmental declarations. Check for availability constraints as specialized grades often have limited supply chains. Ensure the supplier provides traceability documentation required for defense or aerospace procurement standards.

DC DC Switching Controllers Selection Notes

Select this component when a synchronous buck controller is needed for high-current applications (up to 25A) with strict low-power standby requirements. The wide input voltage range suits systems powered by intermediate bus voltages or varying battery sources. Choose the military grade version only if the application demands operation below -40°C. Consider the external MOSFET selection carefully to match the 25A current capability and thermal requirements.

DC DC Switching Controllers Part Context

The LTC3807 belongs to Analog Devices' family of low IQ synchronous step-down controllers. This series is characterized by its ability to maintain efficiency at light loads while supporting high peak currents. The MPFE designation specifically denotes the military temperature range extension compared to standard commercial variants like the LTC3807IFE. It serves as a core control IC for custom power stages rather than an integrated regulator.

DC DC Switching Controllers Replacement Considerations

LTC3807IFE#PBF: Commercial grade equivalent with -40°C to +125°C operating range. LTC3807IUDC#PBF: Commercial grade QFN package alternative. Verify that the military grade qualification is not strictly required before substituting with commercial versions.

DC DC Switching Controllers FAQ

What is the maximum output voltage capability of the LTC3807?

The LTC3807 supports an adjustable output voltage range from 0.8V to 24V.

How does the LTC3807 handle light load conditions?

It offers selectable operation modes including continuous conduction, pulse skip mode, and low ripple Burst Mode to improve efficiency at light loads.