www.fairchildsemi.com

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

Rev. 1.0.4

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 Whitney Platform

• VRM for Pentium III processor

• Programmable multi-output power supply

Description

The FAN5059 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 FAN5059 features remote

voltage sensing, independently adjustable current limit, and a

transient response. The FAN5059 uses a 5-bit D/A converter

to program the output voltage from 1.3V to 3.5V. The

FAN5059 uses a high level of integration to deliver load

Block Diagram

VID3

VID2

VID1

16

VID0

GNDP

23

22

2

18

24

1

17

-

+

-

+

OSC

1.24V

Reference

Digital

Control

Power

Good

5-Bit

DAC

VID4

87 6 5 4

+5V

+12V

PWRGD

-

+

ENABLE/SS

VCC

GNDA

3

LODRV

HIDRV

VCCP

21

VCCA

+5V

20

-

REF

REF

PWRGD,

OCL

PWRGD,

OCL

+3.3V

+1.5V

10

9

+2.5V

12

11

19

OCL

-

+

VCCP

PWRGD, OCL

V

3.3/1.5V

15

14

13

-

+

+

-

+

-

+

FAN5059

High Performance Programmable Synchronous

DC-DC Controller for Multi-Voltage Platforms