LT1576IS8-5#PBF

Overview

The LT1576IS8-5#PBF is a monolithic step-down switching regulator manufactured by Analog Devices. It operates from an input voltage range of 5 V to 25 V and provides a fixed 5 V output at up to 1.5 A. The device integrates a 0.45 Ω NPN power switch and functions at a fixed 200 kHz frequency. It features a shutdown mode reducing supply current to 1.16 mA, thermal protection, and current limiting. Packaged in an 8-lead SOIC, it supports operation between -40°C and +125°C.

Feature Summary

• Integrates a high-current NPN power switch for efficient buck conversion
• Includes thermal shutdown and cycle-by-cycle current limiting for protection
• Supports low-power standby via a dedicated shutdown pin

Applications

• Battery-powered systems requiring regulated 5V rails
• Post-regulation of higher voltage bus lines
• General-purpose DC/DC conversion in industrial equipment

Procurement Notes

Verify the specific suffix #PBF indicates lead-free RoHS compliance when sourcing. Confirm the SOIC-8 package dimensions match your PCB footprint requirements. Ensure the fixed 5V output aligns with your load specifications, as adjustable variants exist within the same series. Check manufacturer documentation for any recent design changes or pinout updates.

Selection Notes

Select this component when a fixed 5V output is required from inputs between 5V and 25V. It is suitable for applications needing up to 1.5A without external pass transistors. Consider the 200kHz switching frequency for trade-offs between component size and efficiency. Verify that the thermal performance in your enclosure supports the expected load currents.

Part Context

This part belongs to the LT1576 family of micropower switching regulators. It shares architectural similarities with the LT1376 but differs in switching frequency and package options. The IS8 designation specifies the industrial temperature range and SOIC-8 package format. It serves as a compact solution for medium-current step-down applications.

Replacement Considerations

LT1376IS8-5#PBF offers similar functionality with a higher 500kHz switching frequency.