FAN5070 Datasheet

IC型號：
FAN5070
PDF描述：
High Performance Programmable Synchronous DC-DC Controller
文件大小：
148.26KB
PDF頁數(shù)：
14頁
芯片廠家：
FAIRCHILD

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FAN5070

High Performance Programmable Synchronous

DC-DC Controller

Features

鈥?Output programmable in 25mV steps from 1.05V to

1.825V using a dynamically programmable integrated

5-bit DAC

鈥?Remote sense

鈥?Programmable Active Droop

鈩?/div>

up to 200mV

鈥?Drives N-Channel MOSFETs

鈥?Overcurrent protection using MOSFET sensing

鈥?Overvoltage protection including startup

鈥?85% ef鏗乧iency typical at full load

鈥?Integrated Power Good and Enable/Soft Start functions

鈥?Meets Intel VRM8.5 speci鏗乧ations using minimum

number of external components

鈥?20 pin SOIC package

Description

The FAN5070 is a synchronous mode DC-DC controller IC

which provides a highly accurate, programmable output volt-

age for platforms such as the Intel Pentium III, and provides a

complete solution for all Intel VRM8.5 CPU applications,

and for other high-performance processors. The FAN5070

features remote voltage sensing, independently adjustable

current limit, and a proprietary wide-range Programmable

Active Droop

鈩?/div>

for optimal converter transient response and

VRM8.5 compliance. The FAN5070 uses a 5-bit D/A con-

verter to dynamically program the output voltage during oper-

ation from 1.05V to 1.825V in 25mV steps. The FAN5070

uses a high level of integration to deliver load currents in

excess of 28A from a 5V source with minimal external

circuitry. Synchronous-mode operation offers optimum

ef鏗乧iency over the entire speci鏗乪d output voltage range. An

on-board precision low TC reference achieves 0.8% voltage

regulation without expensive external components. The

FAN5070 also offers integrated functions including open-

collector Power Good, Output Enable/Soft Start and current

limiting, and is available in a 20 pin SOIC package.

Applications

鈥?Power supply for Pentium

廬

III Platforms

鈥?VRM for Pentium III processor

鈥?Programmable power supply

Block Diagram

+5V

VCCA 17

OCL

+12V

+5V

OSC

20 VCCP

1 HIDRV

Digital

Control

VCC

19 LODRV

GNDP

5-Bit

DAC

1.24V

Reference

Power

Good

GNDA

ENABLE/SS

PWRGD

8 7 65 4

VID0 VID2 VID4

VID1 VID3

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

REV. 1.0.1 8/7/01

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