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RT9173/A
1.5A/3A Bus Termination Regulator
General Description Features
The RT9173/A regulator is designed to convert Support Both DDR 1 (1.25VTT) and DDR 2
voltage supplies ranging from 1.8V to 6V into a (0.9VTT) Requirements
desired output voltage which adjusted by two external Power TO-263-5 and SOP-8 Packages
resistors, voltage divider. The regulator is capable of Capable of Sourcing and Sinking Current
sourcing or sinking up to 1.5A/3A of current while 1.5A/3A
regulating an output voltage to within 2% or less. Current-limiting Protection
Thermal Protection
The RT9173/A, used in conjunction with series
Integrated Power MOSFETs
termination resistors, provides an excellent voltage
Generates Termination Voltages for SSTL-2
source for active termination schemes of high speed
High Accuracy Output Voltage at Full-load
transmission lines as those seen in high speed
Adjustable VOUT by External Resistors
memory buses and distributed backplane designs.
Minimum External Components
The voltage output of the regulator can be used as a
Shutdown for Standby or Suspend Mode
termination voltage for DDR SDRAM.
Operation with High-impedance Output
Current limits in both sourcing and sinking mode, plus
on-chip thermal shutdown make the circuit tolerant of Pin Configurations
the output fault conditions. Part Number Pin Configurations
Applications RT9173ACM5 TOP VIEW
(Plastic TO-263-5) 1. VIN
Computers
2. GND
Disk Drives
3. VCNTL (TAB)
CD-ROM 1 2 3 4 5 4. REFEN
Supply Splitter 5. VOUT
Graph Card
RT9173CS TOP VIEW
Ordering Information (Plastic SOP-8) VIN 1 8 VCNTL
RT9173/A GND 2 7 VCNTL
Package type REFEN 3 6 VCNTL
M5 : TO-263-5
VOUT 4 5 VCNTL
S : SOP-8
Operating temperature range
C: Commercial standard Function Block Diagram
3A sink & source
1.5A sink & source VCNTL VIN
Current
Limiting Sensor
REFEN CNTL VOUT
Thermal
GND
DS9173/A-06 March 2002 www.richtek-ic.com.tw
1
RT9173/A
Pin Description
Pin Name Pin Function
VIN Power Input
GND Ground
VCNTL Gate Drive Voltage
REFEN Reference Voltage Input and Chip Enable
VOUT Output Voltage
Absolute Maximum Ratings
Input Voltage 7V
Power Dissipation Internally Limited
ESD Rating 2KV
Storage Temperature Range -65