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Preliminary

RT9174

Triple Linear Regulator Controllers

General Description

The RT9174 is a triple linear regulator controller

designed for motherboard application.

The regulators are intended to regulate the

computer system AGP (2X/4X) power, the 2.5V

clock power, and the 1.8V power for North/South

Bridge core voltage and/or cache memory circuits.

All controllers can drive NPN or NMOSFET pass

transistor. A special scheme empoly driver voltage

could be higher than V

DD

when driving NMOSFET

through the 12V power.

The RT9174 future a small SOP-8 package for

saving board area. It also builds in current limiting

and thermal shutdown protection function.

Features

Integrated Three Linear Controllers in a SOP-8

Package

Driving NPN or NMOSFET

Sourcing ( > 100mA) and Sinking ( > 5mA) Driver

Tri-State Output Driver

Low Internal 0.8V Reference

Adjustable Output Voltage Setting

High Output Stability

V

DDQ

1.5/3.3V Automatic Changing for AGP

Wide 3V ~ 8V Input Voltage Range

Current Limiting and Thermal Protection

Applications

Mother Boards Power Supply

Graphic Cards

Ordering Information

RT9174C S

Package type

S : SOP-8

Operating temperature range

C: Commercial standard

Pin Configurations

Part Number

RT9174CS

(Plastic SOP-8)

Pin Configurations

TOP VIEW

VDD

1

DRI1

2

FB1

3

GND

4

8

7

6

5

DRI3

FB3

DRI2

FB2

Function Block Diagram

Thermal

Limit

VDD

OC

+

DRI1

OC

+

_

0.8V

1.3V

Reference

_

_

_

+

FB2

OC

+

DRI3

+

FB3

DRI2

_

_

+

FB1

GND

DS9174-00 April 2001

www.richtek.com

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