LT3640IUFD#PBF

Overview

The LT3640IUFD#PBF is a dual monolithic buck regulator manufactured by Analog Devices, housed in a QFN-28 package. It operates with an input voltage range of 4 V to 35 V and delivers up to 1.3 A output current per channel. The device features a fixed switching frequency of 2.5 MHz and a maximum output voltage of 33.97 V. Quiescent current is specified at 275 uA. It functions within a temperature range of -40 C to + 125 C and integrates power-on reset and watchdog timer capabilities for system protection.

Feature Summary

• Integrates two independent synchronous buck converters in a single compact package
• Includes integrated power-on reset generator and programmable watchdog timer
• Supports high-frequency operation to minimize external passive component size
• Provides comprehensive thermal and electrical protection mechanisms

Applications

• Industrial control systems requiring dual isolated or non-isolated power rails
• Automotive electronics operating within wide input voltage ranges
• Embedded computing platforms needing efficient step-down conversion
• Telecommunications infrastructure equipment

Procurement Notes

Verify the specific suffix PBF indicates lead-free compliance and RoHS standards before procurement. Confirm the QFN-28 package dimensions match the target PCB footprint design. Ensure the supplier provides valid manufacturer traceability documentation. Check for any regional distribution restrictions that may affect availability. Validate that the ordering part number matches the exact electrical specifications required for the application.

Selection Notes

Select this component when dual independent buck outputs are required from a single IC to save board space. Consider the 2.5 MHz switching frequency for applications prioritizing small passive component sizes. Evaluate the 4 V to 35 V input range against the system's supply voltage variations. Assess the need for integrated reset and watchdog functions to simplify system-level safety requirements.

Part Context

This part belongs to the LT3640 series of dual monolithic buck regulators from Analog Devices. It is designed for applications requiring two regulated outputs from a single controller. The series emphasizes high efficiency and compact solution size through high-frequency operation. It serves as a power management solution for complex embedded systems.

Replacement Considerations

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