RT9174_11 Datasheet, PDF (1/7 Pages) Richtek Technology Corporation – Triple Linear Regulator Controllers

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 employing
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
RT9174
Package Type
S : SOP-8
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
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 to 8V Input Voltage Range
z Current Limiting and Thermal Protection
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Mother Boards Power Supply
z Graphic Cards
Pin Configurations
(TOP VIEW)
VDD
DRI 1 2
FB1 3
GND 4
8
DRI 3
7
FB3
6 DRI 2
5
FB2
SOP-8
Function Block Diagram
VDD
Thermal
Limit
OC
DRI1
+
-
-
+
FB1
GND
0.8V 1.3V
Reference
OC
+
-
-
+
OC
+
-
-
+
DRI2
FB2
DRI3
FB3
DS9174-08 April 2011
www.richtek.com
1