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RC5054A

Fairchild Semiconductor
Part Number RC5054A
Manufacturer Fairchild Semiconductor
Description Programmable Synchronous DC-DC Converter Controller for Low Voltage Microprocessors
Published Apr 16, 2005
Detailed Description www.fairchildsemi.com RC5054A Programmable Synchronous DC-DC Converter Controller for Low Voltage Microprocessors Featu...
Datasheet PDF File RC5054A PDF File

RC5054A
RC5054A

Overview
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 (DAC) that adjusts the output voltage from 2.
1VDC to 3.
5VDC in 0.
1V increments and from 1.
3VDC to 2.
1VDC in 0.
05V steps.
The RC5054A provides simple, single feedback loop, volt- Block Diagram VCC VSEN 110% + POWER-ON RESET (POR) - PGOOD 90% + 115% + OVERVOLTAGE 10µA OVP SOFTSTART OVERCURRENT 4V SS BOOT UGATE PHASE VID0 VID1 VID2 VID3 VID4 FB COMP GND RT OSCILLATOR D/A CONVERTER (DAC) DACOUT + PWM COMPARATOR GATE CONTROL LOGIC LGATE PGND - + OCSET REFERENCE 200µA - + INHIBIT PWM - ERR...


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