LT3579IUFD-1#PBF

Overview

The LT3579IUFD-1#PBF is a monolithic switching regulator IC from Analog Devices, designed for boost, inverting, Cuk, flyback, and SEPIC topologies. It integrates a high-voltage switch capable of handling up to 42V with a continuous current limit of 6A. The device operates within an input voltage range of 2.5V to 16V and supports adjustable output voltages starting from 1.215V. It features a programmable switching frequency ranging from 200kHz to 2.5MHz. Packaged in a 20-pin QFN (4x5mm) with an exposed pad, it supports operation temperatures from -40°C to +125°C.

Feature Summary

• Integrates a high-voltage power switch rated for 42V operation
• Supports multiple DC/DC converter topologies including boost, inverting, Cuk, flyback, and SEPIC
• Features programmable switching frequency for optimization of external component size
• Includes comprehensive protection mechanisms such as cycle-by-cycle current limiting and thermal shutdown

Applications

• Industrial control systems requiring isolated or inverted power rails
• Automotive electronics utilizing wide input voltage ranges
• Battery-powered devices needing efficient step-up conversion
• Telecommunications infrastructure power supplies

Procurement Notes

Verify the specific suffix '-1' indicates the fixed internal resistor configuration for gain setting against your design requirements. Confirm package integrity for the 20-QFN form factor during inspection. Ensure compatibility with the manufacturer's RoHS compliance standards. Cross-reference the datasheet revision date to validate parameter accuracy before finalizing procurement orders.

Selection Notes

Select this component when a single IC must support diverse non-isolated converter topologies beyond standard buck or boost configurations. The integrated 6A switch eliminates the need for external pass transistors in moderate power applications. Consider the 20-QFN package for space-constrained designs requiring robust thermal performance through the exposed pad connection.

Part Context

This part belongs to the LT3579 family of high-voltage switching regulators. It shares architectural similarities with other ADI power management ICs but is distinct in its multi-topology capability. The '-1' suffix typically denotes a specific internal feedback divider ratio, differentiating it from variants like the LT3579IUFD which may offer fully adjustable gain settings via external resistors.

Replacement Considerations

LT3579IUFD#PBF serves as a direct functional alternative if adjustable gain is preferred over the fixed configuration.