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SE9174 Datasheet Preview

SE9174 Datasheet

2.0A Bus Termmination Regulator

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SE9174 pdf
Description
The SE9174 regulator is designed to convert
www.datavsohletaetg4eu.csomupplies 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.
Pin Configuration
Features
¾ Support Both DDR 1 (1.25VTT) and DDR 2
(0.9VTT) Requirements
¾ SOP-8 Packages
¾ Capable of Sourcing and Sinking Current 2.0A
¾ Current-limiting Protection
¾ Thermal Protection
¾ Current-shoot-through protection
¾ Integrated Power MOSFETs
¾ Generates Termination Voltages for SSTL-2
¾ High Accuracy Output Voltage at Full-Load
¾ Adjustable Vout by External Resistors
¾ Minimum External Components
¾ Shutdown for Standby or Suspend Mode
Operation with High-impedance Output
Application
¾ DDR Memory Termination
¾ Active Termination Buses
¾ Supply Splitter
Block Diagram
Pin Description
Pin Name
Pin function
VIN
GND
Power Input
Ground
VCNTL
REFEN
Gate Drive Voltage
Reference Voltage input and
Chip Enable
VOUT
Output Voltage
VCNTL
VIN
REFEN
Current
Limiting Sensor
Thermal
CNTL
VOUT
GND
All contents are subject to change without prior notice
© Seaward Electronics Inc., 2005. • www.seawardinc.com • Page 1



Seaward
Seaward

SE9174 Datasheet Preview

SE9174 Datasheet

2.0A Bus Termmination Regulator

No Preview Available !

SE9174 pdf
Absolute Maximum Rating (1)
Parameter
Symbol
www.datasheet4uI.ncopmut Voltage
Power Dissipation
ESD Rating
VIN
PD
--
Storage Temperature
Range
TS
Lead Temperature
(Soldering, 5 sec.)
TLEAD
Package Thermal
Resistance
ΘJC
Value
6
Internally Limited
3
-65 to 150
260
15.7
Unit
V
--
KV
°C
°C
ºC/W
Electrical Characteristics
VIN=2.5V, VCNTL=3.3V, VREFEN=1.25V, COUT=10µF (Ceramic)), TA=25ºC, unless otherwise specified
Parameter
Output Offset Voltage (2)
Load Regulation
(DDR 1/2)
Input Voltage Range
(DDR 1/2)
Symbol
VOS
|VLOAD|
VIN
VCNTL
Test Conditions
IOUT = 0A
IL : 0A2.0A
IL : 0A-2.0A
Keep VCNTLVIN on
operation power on and
power off sequences
Min Typ
-20 -5
-- 0.5
-- 0.5
1.6 2.5/1.8
-- 3.3
Current In Shutdown
Mode
ISHDN
VREFEN 0.2V, RL = 180
--
1
Short Circuit Protection
Current limit
Quiescent Current
ILIMIT
IQ IL=2.0A
Over Temperature Protection
--
--
2.5
1.4
Thermal Shutdown
Temperature
TCASE
3.3V VCNTL 5 V
-- 100
Thermal Shutdown
Hysterresis
Guaranteed by design
--
30
Shutdown Function
Shutdown Threshold
Output=High
0.8 --
Trigger
Output=Low
-- --
Note 1: Exceeding the absolute maximum rating may damage the device.
Note 2: VOS offset is the voltage measurement defined as VOUT subtracted from VREFEN
Max
20
2
2
--
6
90
--
3
--
--
--
0.2
Units
mV
%
V
µA
A
mA
ºC
V
All contents are subject to change without prior notice
© Seaward Electronics Inc., 2005. • www.seawardinc.com • Page 2


Part Number SE9174
Description 2.0A Bus Termmination Regulator
Maker Seaward
Total Page 5 Pages
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