Description
The SE9174 regulator is designed to convert
voltage supplies ranging from 1.6V to 6V into a
desired output voltage, which is adjusted by two
external voltage divider resistors. The regulator is
capable of sourcing or sinking up to 2.0A of current
while regulating an output voltage to within 2%
(DDR 1 or DDR 2) or less.
The SE9174, used in conjunction with series
termination resistors, provides an excellent voltage
source for active termination schemes of high
speed transmission lines as those seen in high
speed memory buses and distributed back-plane
designs. The voltage output of the regulator can be
used as a termination voltage for DDR SDRAM.
Current limits in both sourcing and sinking
mode, plus on-chip thermal shutdown make the
circuit tolerant of the output fault conditions.
Features
Support Both DDR 1 (1.25V
TT
) and DDR 2
(0.9V
TT
) Requirements
SOP-8 Packages
Capable of Sourcing and Sinking Current 2.0A
Current-limiting Protection
Thermal Protection
Current-shoot-through protection
Integrated Power MOSFETs
Generates Termination Voltages for SSTL-2
High Accuracy Output Voltage at Full-Load
Adjustable Vout by External Resistors
Minimum External Components
Shutdown for Standby or Suspend Mode
Operation with High-impedance Output
Application
DDR Memory Termination
Active Termination Buses
Supply Splitter
Pin Configuration
Pin Description
Pin Name
V
IN
GND
V
CNTL
REFEN
Pin function
Power Input
Ground
Gate Drive Voltage
Reference Voltage input and
Chip Enable
V
OUT
Output Voltage
Block Diagram
VCNTL
Current
Limiting Sensor
VIN
REFEN
Thermal
CNTL
VOUT
GND
All contents are subject to change without prior notice
漏 Seaward Electronics Inc., 2005. 鈥?www.seawardinc.com 鈥?Page 1
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