LT1507IS8-3.3#PBF

Overview

The LT1507IS8-3.3#PBF is a monolithic step-down switching regulator manufactured by Analog Devices Inc., designed for high-efficiency power conversion in compact applications. This specific variant features a fixed 3.3V output voltage and supports an output current of up to 1.5A, making it suitable for powering digital loads requiring stable low-voltage rails. The device operates with a fixed internal switching frequency of 500kHz, allowing for the use of small passive components while maintaining efficient regulation across varying input conditions. It utilizes a SOIC-8 surface-mount package, facilitating easy integration into space-constrained printed circuit boards. The regulator includes built-in protection mechanisms such as thermal shutdown and current limiting to ensure reliable operation under fault conditions. Operating within an extended temperature range from -40°C to +85°C, it provides robust performance for industrial and commercial environments. The component integrates the control logic, oscillator, and power switch into a single chip, simplifying design implementation.

Feature Summary

• Integrates a 500kHz fixed-frequency oscillator and power switch for simplified external component requirements
• Provides fixed 3.3V output voltage with adjustable feedback capability for other voltages
• Includes thermal shutdown and current limit protection for enhanced system reliability
• Features a compact SOIC-8 surface mount package for space-efficient PCB layouts

Applications

• Portable battery-powered equipment requiring efficient step-down conversion
• Industrial control systems needing regulated low-voltage power supplies
• Communication infrastructure providing stable rails for digital logic circuits
• Automotive electronics operating within extended temperature ranges

Procurement Notes

Verify the exact part number suffix and manufacturer lot codes upon receipt to ensure authenticity and compliance with specifications. Confirm that the component matches the required SOIC-8 package dimensions and pinout configuration before soldering. Check datasheet revisions for any updates to electrical characteristics or recommended operating conditions. Ensure storage conditions meet moisture sensitivity level requirements to prevent damage during assembly. Validate supplier credentials and traceability documentation to maintain supply chain integrity and quality standards.

Selection Notes

Choose this regulator when a fixed 3.3V output is required without external feedback network adjustments. Consider the 1.5A current capacity against peak load demands to avoid thermal stress. Evaluate the 500kHz switching frequency against electromagnetic interference constraints and inductor size preferences. Compare input voltage ranges with available power sources to ensure adequate dropout margin. Assess thermal management needs based on ambient temperatures and board copper area availability for heat dissipation.

Part Context

The LT1507 series represents Analog Devices' line of high-efficiency buck regulators designed for cost-sensitive applications. The IS8 variant specifically denotes the industrial temperature grade and SOIC-8 package format. This model belongs to a family known for integrating power switches to reduce external component count. The #PBF suffix indicates lead-free packaging compliant with environmental directives. Understanding the broader LT1507 ecosystem helps in selecting compatible alternatives or upgrades within the same product lineage.

Replacement Considerations

LT1507CS8#PBF serves as a parameter-equivalent alternative offering similar electrical characteristics. LT1507IS8#PBF is another verified substitute within the same series providing identical functionality. Verify pin compatibility and thermal performance when substituting these parts. Ensure that the replacement maintains the required 3.3V output stability and current handling capabilities.