LT3579IUFD#PBF

Overview

The LT3579IUFD#PBF is a monolithic switching regulator IC manufactured by Analog Devices Inc., housed in a 20-WFQFN package with an exposed thermal pad. It functions as a versatile DC-DC converter supporting boost, buck, Cuk, flyback, and SEPIC topologies. The device integrates a high-voltage switch capable of handling up to 42V and delivers a continuous output current of 6A. It operates with an input voltage range from 2.5V to 16V and features an adjustable switching frequency between 200kHz and 2.5MHz. The output voltage is adjustable from 1.215V to 42V, providing flexible power management for various industrial applications.

Feature Summary

• Integrates a high-voltage switch rated for 42V operation within a compact surface-mount package.
• Supports multiple conversion topologies including boost, buck, Cuk, flyback, and SEPIC configurations.
• Features an adjustable switching frequency range to optimize efficiency and component size.
• Provides fault protection mechanisms to safeguard the circuit during abnormal operating conditions.

Applications

• Industrial automation systems requiring isolated or non-isolated power conversion
• Automotive electronics utilizing single-cell lithium-ion battery inputs
• Telecommunications infrastructure equipment needing flexible voltage regulation
• Portable instrumentation powered by variable input sources

Procurement Notes

Verify the specific suffix IUFD#PBF against the official Analog Devices datasheet to confirm the 20-QFN package and industrial temperature grade. Ensure compatibility with your PCB footprint design, specifically the exposed pad thermal requirements. Confirm that the 6A switch current rating meets your peak load demands without exceeding thermal limits under worst-case ambient conditions.

Selection Notes

Select this component when a single IC must support diverse topologies such as SEPIC or flyback without external complex driver circuits. The 42V switch rating allows direct connection to higher voltage rails compared to standard 36V parts. Consider the 20-QFN package for space-constrained designs where thermal dissipation via the exposed pad is manageable. Evaluate the 6A current capability against your maximum load requirements to ensure adequate headroom.

Part Context

The LT3579 belongs to Analog Devices' family of high-voltage switching regulators designed for flexibility. Unlike fixed-topology converters, this part integrates the necessary control logic and power stage for multiple architectures. It targets applications where board space is limited but multiple voltage rails or polarities are required from a single input source.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify pinout and electrical specifications carefully if considering alternative manufacturers, as topology integration levels may differ significantly.