RT9173_07 Datasheet, PDF (1/13 Pages) Richtek Technology Corporation – Peak 3A Bus Termination Regulator

RT9173/A
Peak 3A Bus Termination Regulator
General Description
Features
The RT9173/A regulator is designed to convert voltage
supplies ranging from 1.6V to 6V into a desired output
voltage which adjusted by two external voltage divider
resistors. The regulator is capable of sourcing or sinking
up to 3A of peak current while regulating an output voltage
to within 2% (DDR 1) and 3% (DDR 2) or less.
The RT9173/A, 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.
z Support Both DDR 1 (1.25V_TT) and DDR 2
(0.9V_TT) Requirements
z SOP-8, TO-252-5 and TO-263-5 Packages
z Capable of Sourcing and Sinking 3A Peak Current
z Current-limiting Protection
z Thermal Protection
z Integrated Power MOSFETs
z Generates Termination Voltages for SSTL-2
z High Accuracy Output Voltage at Full-Load
z Adjustable V_OUT by External Resistors
z Minimum External Components
z Shutdown for Standby or Suspend Mode
Operation with High-impedance Output
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
Ordering Information
RT9173/A
Package Type
M5 : TO-263-5
L5 : TO-252-5
S : SOP-8
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
3A Sink & Source
1.5A Sink & Source
z DDR Memory Termination
z Active Termination Buses
z Supply Splitter
Pin Configurations
(TOP VIEW)
5
4
3
2
1
VOUT
REFEN
VCNTL (TAB)
GND
VIN
Note :
RichTek Pb-free and Green 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.
`100%matte tin (Sn) plating.
TO-263-5 (RT9173A)
5
VOUT
4
REFEN
3
VCNTL (TAB)
2
GND
1
VIN
TO-252-5 (RT9173A)
DS9173/A-18 March 2007
VIN
GND
2
REFEN
3
VOUT
4
8
VCNTL
7
VCNTL
6
VCNTL
5
VCNTL
SOP-8 (RT9173)
www.richtek.com
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