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RC5057M

Fairchild Semiconductor
Part Number RC5057M
Manufacturer Fairchild Semiconductor
Description High Performance Programmable Synchronous DC-DC Controller for Low Voltage Microprocessors
Published Apr 16, 2005
Detailed Description www.fairchildsemi.com RC5057 High Performance Programmable Synchronous DC-DC Controller for Low Voltage Microprocessors...
Datasheet PDF File RC5057M PDF File

RC5057M
RC5057M

Overview
www.
fairchildsemi.
com RC5057 High Performance Programmable Synchronous DC-DC Controller for Low Voltage Microprocessors Features • Programmable output from 1.
3V to 3.
5V using an integrated 5-bit DAC • Remote sense • Active Droop • 85% efficiency typical at full load • Integrated Power Good and Enable/Soft Start functions • Drives N-channel MOSFETs • Overcurrent protection using MOSFET sensing • 16 pin SOIC package • Meets Intel Pentium II & III specifications using minimum number of external components Description The RC5057 is a synchronous mode DC-DC controller IC which provides a highly accurate, programmable output voltage for all Pentium II & III CPU applications and other high-performance processors.
The RC5057 features remote voltage sensing, adjustable current limit, and active droop for optimal converter transient response.
The RC5057 uses a 5-bit D/A converter to program the output voltage from 1.
3V to 3.
5V.
The RC5057 uses a high level of integration to deliver load currents in excess of 16A from a 5V source with minimal external circuitry.
Synchronous-mode operation offers optimum efficiency over the entire specified output voltage range.
An on-board precision low TC reference achieves tight tolerance voltage regulation without expensive external components, while active droop permits exact tailoring of voltage for the most demanding load transients.
The RC5057 also offers integrated functions including Power Good, Output Enable/ Soft Start and current limiting, and is available in a 16 pin SOIC package.
Applications • • • • • Power supply for Pentium® II & III VRM for Pentium II & III processor Telecom line cards Routers, switches & hubs Programmable step-down power supply Block Diagram +5V VCCA 5 + 3 RS 10 4 8 VCCP 9 HIDRV +12V +5V OSC + Digital Control + + 7 6 5-Bit DAC 16 15141312 VO LODRV GNDP Power Good 2 PWRGD 1.
24V Reference 11 GNDA 1 ENABLE/SS VID0 VID2 VID4 VID1 VID3 Pentium is a registered trademark of Intel Corporation Rev.
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