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RC5052 Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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RC5052 Datasheet(HTML) 1 Page - Fairchild Semiconductor |
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1 / 18 page  www.fairchildsemi.com Pentium is a registered trademark of Intel Corporation REV. 1.3.2 8/27/01 Features • Optimized for 12V main power • 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 • 20 pin SOIC package • Meets Intel Pentium II & III specifications using minimum number of external components • Adjustable deadtime, frequency • Crowbar protection for overvoltage Applications • Power supply for Pentium® II & III • VRM for Pentium II & III processor • Telecom line cards • Routers, switches & hubs • Programmable step-down power supply Description The RC5052 is a synchronous mode DC-DC controller IC, optimized for 12V main power, which provides a highly accu- rate, programmable output voltage for all Pentium II & III CPU applications and other high-performance processors. The RC5052 features remote voltage sensing, adjustable current limit, and active droop for optimal converter transient response. The RC5052 uses a 5-bit D/A converter to program the output voltage from 1.3V to 3.5V. The RC5052 uses a high level of integration to deliver load currents in excess of 16A from a 12V source with minimal external circuitry. Synchro- nous-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 RC5052 also offers integrated functions including Power Good, Output Enable/Soft Start, current limiting, adjustable frequency, adjustable deadtime and over- voltage crowbar protection, and is available in a 20 pin SOIC package. Block Diagram 2 VID0 GNDP 9 10 8 OVP 7 13 4 11 12 3 - + - + OSC 1.24V Reference Digital Control 5-Bit DAC VID1 VID2 VID3 VID4 20 19181716 +12V +12V PWRGD - + ENABLE/SS VO GNDA 14 LODRV HIDRV VCCP RS 6 15 1 VCCA DTA +5V 5 + - Power Good Rosc RC5052 High Performance Programmable Synchronous DC-DC Controller for Low Voltage Microprocessors |
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