General Description
The RT9173D is a simple, cost-effective and high-speed linear regulator designed to generate termination voltage in double data rate (DDR) memory system to comply with the JEDEC SSTL_2 and SSTL_18 or other specific interfaces such as HSTL, SCSI-2 and SCSI-3 etc. devices requirements. The regulator is capable of actively sinking or sourcing continuous 2A or up to 3A transient peak current while regulating an output voltage to within 40mV. The output termination voltage cab be tightly regulated to track 1/2VDDQ by two external voltage divider resistors or the desired output voltage can be pro-grammed by externally forcing the REFEN pin voltage.

FEATUREs
Ideal for DDR-I, DDR-II and DDR-III VTT Applications
Sink and Source Current
  2A Continuous Current
  Peak 3A for DDRI and DDRII
  Peak 2.5A for DDRIII
Integrated Power MOSFETs
Generates Termination Voltage for SSTL_2, SSTL _18, HSTL, SCSI-2 and SCSI-3 Interfaces
High Accuracy Output Voltage at Full-Load
Output Adjustment by Two External Resistors
Low External Component Count
Shutdown for Suspend to RAM (STR) Functionality with High-Impedance Output
Current Limiting Protection
On-Chip Thermal Protection
Available in SOP-8 (Exposed Pad) Packages
VIN and VCNTL No Power Sequence Issue
RoHS Compliant and 100% Lead (Pb)-Free

APPLICATIONs
Desktop PCs, Notebooks, and Workstations
Graphics Card Memory Termination
Set Top Boxes, Digital TVs, Printers
Embedded Systems
Active Termination Buses
DDR-I, DDR-II and DDR-III Memory Systems