RC5051MT

Overview

The RC5051MT 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, the device features remote sense, active droop, and integrated Power Good and Enable/Soft Start functions. It drives N-channel MOSFETs with overcurrent protection using MOSFET sensing and offers adjustable deadtime and frequency.

Feature Summary

• Integrated 5-bit DAC for precise programmable output voltage control
• Optimized for 12V main power supply architectures
• Includes remote sense and active droop compensation capabilities

Applications

• Power supply for Pentium II & III processors
• VRM for Pentium II & III processor
• Telecom line cards
• Routers, switches & hubs
• Programmable step-down power supply

Procurement Notes

Verify the specific suffix 'MT' against official Fairchild documentation to confirm package type and tape-and-reel specifications. Ensure compatibility with required operating temperature ranges and check for RoHS compliance status in current datasheets before procurement.

Selection Notes

Select this component for low-voltage microprocessor power management requiring high accuracy. The integrated DAC simplifies voltage adjustment compared to resistor-divider designs. Consider the 20-pin SOIC package constraints and thermal requirements when designing the PCB layout for optimal heat dissipation.

Part Context

This part belongs to the RC505x series of synchronous DC-DC controllers developed by Fairchild Semiconductor. It is designed to meet Intel VRM specifications for legacy high-performance processors, offering a compact solution with minimal external components for voltage regulation tasks.

Replacement Considerations

RC5052MT: Offers similar functionality with additional crowbar protection for overvoltage scenarios. RC5054MT: Provides comparable performance for low-voltage microprocessor applications with potentially different pinout or feature sets.