RT9173/A
1.5A/3A Bus Termination Regulator
General Description
The RT9173/A regulator is designed to convert
voltage supplies ranging from 1.8V to 6V into a
desired output voltage which adjusted by two external
resistors, voltage divider. The regulator is capable of
sourcing or sinking up to 1.5A/3A of current while
regulating an output voltage to within 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.
Features
Support Both DDR 1 (1.25VTT) and DDR 2
(0.9VTT) Requirements
Power TO-263-5 and SOP-8 Packages
Capable of Sourcing and Sinking Current
1.5A/3A
Current-limiting Protection
Thermal 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
Pin Configurations
Part Number
RT9173ACM5
(Plastic TO-263-5)
Pin Configurations
TOP VIEW
1.
2.
3.
4.
5.
VIN
GND
VCNTL (TAB)
REFEN
VOUT
Applications
Computers
Disk Drives
CD-ROM
Supply Splitter
Graph Card
1 2 3 4 5
RT9173CS
(Plastic SOP-8)
TOP VIEW
VIN
1
GND
2
8
7
6
5
Ordering Information
RT9173/A
Package type
M5 : TO-263-5
S : SOP-8
Operating temperature range
C: Commercial standard
3A sink & source
1.5A sink & source
VCNTL
VCNTL
VCNTL
VCNTL
REFEN
3
VOUT
4
Function Block Diagram
VCNTL
VIN
Current
Limiting Sensor
REFEN
Thermal
GND
CNTL
VOUT
DS9173/A-06 March 2002
www.richtek-ic.com.tw
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
