RT9174 Datasheet, PDF (1/8 Pages) Richtek Technology Corporation – Triple Linear Regulator Controllers

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.
Ordering Information
RT9174C S
Package type
S : SOP-8
Operating temperature range
C: Commercial standard
Features
z Integrated Three Linear Controllers in a SOP-8
Package
z Driving NPN or NMOSFET
z Sourcing ( > 100mA) and Sinking ( > 5mA) Driver
z Tri-State Output Driver
z Low Internal 0.8V Reference
z Adjustable Output Voltage Setting
z High Output Stability
z V_DDQ 1.5/3.3V Automatic Changing for AGP
z Wide 3V ~ 8V Input Voltage Range
z Current Limiting and Thermal Protection
Applications
z Mother Boards Power Supply
z Graphic Cards
Pin Configurations
Part Number
Pin Configurations
RT9174CS
(Plastic SOP-8)
TOP VIEW
VDD 1
8 DRI 3
DRI 1 2
7 FB3
FB1 3
6 DRI 2
GND 4
5 FB2
Function Block Diagram
VDD
DRI1
FB1
Thermal
Limit
OC
_
_
GND
0.8V 1.3V
Reference
OC
DRI2
FB2
OC
DRI3
FB3
DS9174-00 April 2001
www.richtek-ic.com.tw
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