LT3641IUFD#PBF

Overview

The LT3641IUFD#PBF is a dual monolithic buck regulator from Analog Devices, housed in a 28-lead QFN package. It operates with an input voltage range of 4 V to 42 V and provides two adjustable outputs capable of delivering up to 1.3 A each. The device integrates a 2.5 MHz switching frequency, power-on reset generator, and watchdog timer. Quiescent current is specified at 290 µA, supporting efficient operation across a temperature range of -40°C to +125°C.

Feature Summary

• Integrates dual synchronous buck converters within a single compact package
• Includes built-in power-on reset circuitry and watchdog timer for system reliability
• Supports high-frequency switching to minimize external component size

Applications

• Industrial control systems requiring multiple regulated rails
• Automotive electronics operating on 12V or 24V architectures
• Telecommunications infrastructure power distribution

Procurement Notes

Verify the specific suffix #PBF confirms lead-free compliance and RoHS status before procurement. Confirm the QFN-28 package dimensions match your PCB footprint requirements. Ensure the 42 V maximum input rating aligns with your system's transient voltage conditions. Cross-reference the manufacturer datasheet for latest assembly and sourcing notices.

Selection Notes

Select this component when dual isolated or non-isolated buck conversion is required from a high-voltage source. The integrated reset and watchdog features reduce external logic complexity. Verify that the 1.3 A output current per channel meets the load requirements. Consider thermal performance in the QFN-28 package under maximum load conditions.

Part Context

This part belongs to the LT3641 series of dual buck regulators. It shares the QFN-28 form factor with other Analog Devices PMICs but is distinct due to its 42 V input capability and integrated supervisory functions. It differs from the LT3640 by its higher input voltage tolerance.

Replacement Considerations

LT3640IUFD#PBF offers similar functionality but supports a lower maximum input voltage of 35 V.