Maker : Fairchild Semiconductor
Part No. : RC5058

  Datasheet PDF : RC5058.pdf
  Cross Reference : RC5058 Cross Reference
  Buy Component : RC5058 Find Stock and Price

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Product Information

www.fairchildsemi.com RC5058 High Performance Programmable Synchronous DC-DC Controller for Multi-Voltage Platforms Features • Programmable output for Vcore from 1.3V to 3.5V using an integrated 5-bit DAC • Controls adjustable linears for Vagp (selectable 1.5V/3.3V), Vclock (2.5V), and Vtt (1.5V) or Vnorthbridge (1.8V) • Meets VRM specification with as few as 5 capacitors • Meets 1.550V +40/-70mV over initial tolerance, temperature and transients • • • • • • • Remote sense Programmable Active Droop™ (Voltage Positioning) Drives N-Channel MOSFETs Overcurrent protection using MOSFET sensing 85% efficiency typical at full load Integrated Power Good and Enable/Soft Start functions 24 pin SOIC package Applications • • • • Power supply for Pentium® III Camino Platform Power supply for Pentium III Whitney Platform VRM for Pentium III processor Programmable multi-output power supply Description The RC5058 is a synchronous mode DC-DC controller IC which provides a highly accurate, programmable set of output voltages for multi-voltage platforms such as the Intel Camino, and provides a complete solution for the Intel Whitney and other high-performance processors. The RC5058 features remote voltage sensing, independently adjustable current limit, and a proprietary Programmable Active Droop™ for optimal converter transient response. The RC5058 uses a 5-bit D/A converter to program the output voltage from 1.3V to 3.5V. The RC5058 uses a high level of integration to deliver load currents in excess Block Diagram +3.3V 9 10 VCCP 11 + + +5V VCCA 21 REF PWRGD, OCL OCL REF +12V PWRGD, OCL OSC + 15 14 13 3.3/1.5V 5-Bit DAC 8 7 65 4 VID0 VID2 VID4 VID1 VID3 1.24V Reference 3 GNDA 16 ENABLE/SS Power Good + + 18 RS 20 24 VCCP 1 HIDRV +5V + 19 RD +1.5V 12 +2.5V Digital Control 2 VCC + - V PWRGD, OCL + 23 LODRV 22 GNDP 17 PWRGD Pentium is a registered trademark of Intel Corporation. Programmable Active Droop is a trademark of Fairchild Semiconductor. Rev. 1.0.0 RC5058 PRODUCT SPECIFICATION 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 Programmable Active Droop™ permits exact tailoring of voltage for the most demanding load transients. The RC5058 includes linear regulator controllers for Vtt termination (1.5V), Vclock (2.5V), and Vnorthbridge (1.8V) or Vagp (selectable 1.5V/3.3V), each adjustable with an external divider. The RC5058 also offers integrated functions including Power Good, Output Enable/Soft Start and current limiting, and is available in a 24 pin SOIC package. Pin Assignments HIDRV SW GNDA VID4 VID3 VID2 VID1 VID0 VTTGATE VTTFB VCKGATE VCKFB 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VCCP LODRV GNDP VCCA VFB DROOP ILIM PWRGD SS/ENABLE TYPEDET VAGPGATE VAGPFB RC5058 Pin Definitions Pin Number Pin Name 1 2 3 4-8 HIDRV SW GNDA VID0-4 Pin Function Description High Side FET Driver. Connect this pin through a resistor to the gate of an N-channel MOSFET. The trace from this pin to the MOSFET gate should be <0.5". High side Driver Source and Low side Driver Drain Switching Node. Together with DROOP and ILIM pins allows FET sensing for Vcc current. Analog Ground. Return path for low power analog circuitry. This pin should be connected to a low impedance system ground plane to minimize ground loops. Voltage Identification Code Inputs. These open collector/TTL compatible inputs will program the output voltage over the ranges specified in Table 2. Pull-up resistors are internal to the controller. Gate Driver for VTT Transistor. For 1.5V output. Voltage Feedback for VTT. Gate Driver for VCK Transistor. For 2.5V output. Voltage Feedback for VCK. Voltage Feedback for VAGP. Gate Driver for VAGP Transistor. For 3.3/1.5V output. Type Detec...

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