RT9173 Datasheet, PDF (1/10 Pages) Richtek Technology Corporation – 1.5A/3A Bus Termination Regulator

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.
Applications
z Computers
z Disk Drives
z CD-ROM
z Supply Splitter
z Graph Card
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
Features
z Support Both DDR 1 (1.25VTT) and DDR 2
(0.9VTT) Requirements
z Power TO-263-5 and SOP-8 Packages
z Capable of Sourcing and Sinking Current
1.5A/3A
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
Pin Configurations
Part Number
Pin Configurations
RT9173ACM5
(Plastic TO-263-5)
12 3 4 5
TOP VIEW
1. VIN
2. GND
3. VCNTL (TAB)
4. REFEN
5. VOUT
RT9173CS
(Plastic SOP-8)
TOP VIEW
VIN 1
8 VCNTL
GND ²
REFEN 3
7 VCNTL
6 VCNTL
VOUT ⁴
5 VCNTL
Function Block Diagram
VCNTL
VIN
REFEN
Current
Limiting Sensor
Thermal
CNTL
VOUT
GND
DS9173/A-06 March 2002
www.richtek-ic.com.tw
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