RC5058(1999) View Datasheet(PDF) - Fairchild Semiconductor

Part Name

Description

Manufacturer

RC5058
(Rev.:1999)

High Performance Programmable Synchronous DC-DC Controller for Multi-Voltage Platforms

Fairchild Semiconductor 

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

+1.5V

1

+

-

VCCP

+

-

12

+2.5V

OSC

REF

PWRGD,

OCL

REF

PWRGD,

OCL

+5V

VCCA 21

-

+

OCL

-

+

-

+

19

RD

+12V

+5V

18

RS

20

24 VCCP

1 HIDRV

15

14

13

3.3/1.5V

+

V

-

-

+

PWRGD, OCL

5-Bit

DAC

1.24V

Reference

8 765 4

VID0VID2 VID4

VID1 VID3

-

+

3

GNDA

Digital

Control

16

ENABLE/SS

Power

Good

2

23 LODRV

22

GNDP

17

PWRGD

VCC

Pentium is a registered trademark of Intel Corporation. Programmable Active Droop is a trademark of Fairchild Semiconductor.

Rev. 0.8.2

Preliminary Specification describes products that are not in full production at the time of printing. Specifications are based on design goals and

limited characterization. In the process of final product release, specification. Contact Fairchild Semiconductor for current information.

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