Peak 3A Bus Termination Regulator
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 (1.25VTT) and DDR 2
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 VOUT 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
M5 : TO-263-5
L5 : TO-252-5
S : SOP-8
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
3A Sink & Source
1.5A Sink & Source
z DDR Memory Termination
z Active Termination Buses
z Supply Splitter
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.
3 VCNTL (TAB)
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS9173/A-20 November 2011
is a registered trademark of Richtek Technology Corporation.