RC5051M

Overview

The RC5051M is a synchronous mode DC-DC controller IC optimized for 12V main power applications. It provides a highly accurate, programmable output voltage ranging from 1.3V to 3.5V via an integrated 5-bit DAC. Designed for high-performance processors such as Pentium II and III, it features remote sense, active droop, and integrated Power Good and Enable/Soft Start functions. The device drives N-channel MOSFETs and includes overcurrent protection using MOSFET sensing. It operates in a 20-pin SOIC package and meets Intel Pentium II & III specifications with minimal external components.

Feature Summary

• Optimized for 12V main power input with programmable output voltage control
• Integrated 5-bit DAC for precise voltage adjustment between 1.3V and 3.5V
• Includes remote sense, active droop, and crowbar protection for overvoltage

Applications

• Power supply for Pentium II and III processors
• Voltage Regulator Modules (VRM) for Pentium II and III processors
• Telecom line cards
• Routers, switches, and hubs
• Programmable step-down power supplies

Procurement Notes

Verify the specific suffix 'M' against the manufacturer's official datasheet to confirm package type and temperature range. Confirm current product status, as legacy processor controllers may be discontinued or subject to last-time buy notices. Ensure compatibility with existing PCB footprints for the 20-pin SOIC package before procurement.

Selection Notes

Select this component for designs requiring synchronous buck conversion for low-voltage microprocessors powered by 12V rails. It is suitable for applications needing adjustable output voltages within the 1.3V to 3.5V range. Consider its integration of soft-start and power-good signals if system sequencing requirements are critical. Verify that the target processor architecture aligns with the specified Intel Pentium II & III performance benchmarks.

Part Context

The RC5051M belongs to the RC505x series of synchronous DC-DC controllers developed for high-performance computing applications. This series was designed to meet the stringent power delivery requirements of early 2000s microprocessors. The 'M' suffix typically denotes a specific package variant, often related to lead-free or industrial temperature ratings, consistent with Fairchild Semiconductor's naming conventions during that era.

Replacement Considerations

Publicly confirmed substitute part numbers for the RC5051M are not available in the provided documentation. Users should consult the manufacturer's obsolescence notices or contact technical support for qualified alternatives.