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RT9173B Datasheet

  • RT9173B

  • DDR Bus Termination Regulator

  • 14頁

  • ETC

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Preliminary
RT9173B
2A Bus Termination Regulator
General Description
The RT9173B regulator is designed to convert
voltage supplies ranging from 1.7V to 6V into a
desired output voltage of which adjusted by two
external voltage divider resistors. The regulator is
capable of sourcing or sinking up to 2A of current
while regulating an output voltage to within 40mV.
The RT9173B, 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 backplane 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.
The RT9173B are available in the popular 5-lead
TO-252 and fused SOP-8 (the multiple V
CNTL
pins on
the SOP-8 package are internally connected but
lowest thermal resistance) surface mount packages.
Features
Support Both DDR I (1.25V
TT
) and DDR II
(0.9V
TT
) Requirements
SOP-8 and TO-252-5 Packages
Capable of Sourcing and Sinking Current
Current-limiting Protection
Thermal Protection
Integrated Power MOSFETs
Generates Termination Voltages for SSTL-2
High Accuracy Output Voltage at Full-Load
Adjustable V
OUT
by External Resistors
Minimum External Components
Shutdown for Standby or Suspend Mode
Operation with High-impedance Output
Applications
DDR Memory Termination Supply
Active Termination Buses
Desktop PC/AGP Graphics
Set Top Box/IPC
Supply Splitter
Ordering Information
RT9173B
Package Type
S : SOP-8
L5 : TO-252-5
Operating Temperature Range
C: Commercial Standard
Pin Configurations
Part Number
RT9173BCS
(Plastic SOP-8)
Pin Configurations
TOP VIEW
VIN
1
GND
2
REFEN
3
VOUT
4
8
7
6
5
VCNTL
VCNTL
VCNTL
VCNTL
RT9173BCL5
(Plastic TO-252-5)
1 2 3 4 5
TOP VIEW
1.
2.
3.
4.
5.
VIN
GND
VCNTL (TAB)
REFEN
VOUT
DS9173B-00
June 2003
www.richtek.com
1

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