RC5054A

www.fairchildsemi.com RC5054A Programmable Synchronous DC-DC Converter Controller for Low Voltage Microprocessors Features Drives Two N-Channel MOSFETs Operates from +5V Power Input Simple Single-Loop Control Design - Voltage-Mode PWM Control Fast Transient Response - High-Bandwidth Error Amplifier - Full 0% to 100% Duty Ratio Excellent Output Voltage Regulation TTL Compatible 5 Bit Digital-to-Analog Output Voltage Selection - Wide Range - 1.3VDC to 3.5VDC - 0.1V Binary Steps from 2.1VDC to 3.5VDC - 0.05V Binary Steps from 1.3VDC to 2.1VDC Power-Good Output Voltage Monitor Over-Voltage and Over-Current Fault Monitors - Does Not Require Extra Current Sensing Element, Uses MOSFET’s RDS(ON) Small Converter Size - Constant Frequency Operation - 200kHz Free-Running Oscillator Programmable from 50kHz to 1MHz Applications Power Supply for Pentium®, Pentium Pro, PowerPC™ and Alpha™ Microprocessors High-Power 5V to 3.xV DC-DC Regulators Low-Voltage Distributed Power Supplies Description The RC5054A provides complete control and protection for a DC-DC converter optimized for high-performance microprocessor applications. It is designed to drive two N-Channel MOSFETs in a synchronous-rectified buck topology. The RC5054A integrates all of the control, output adjustment, monitoring and protection functions into a single package. The output voltage of the converter is easily adjusted and precisely regulated. The RC5054A includes a 5-input digitalto-analog converter ...