General Description

The RT9173B regulator is designed to convert voltage supplies ranging from 1.7V to 6V into a desired output voltage of which adjusted by two external voltage divider resistors. The regulator is capable of sourcing or sinking up to 2A of current while regulating an output voltage to within 40mV.

The RT9173B, 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.

Features

• Support Both DDR I (1.25VTT) and DDR II (0.9VTT) Requirements

• SOP-8 and TO-252-5 Packages

• Capable of Sourcing and Sinking Current

• 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

• RoHS Compliant and 100% Lead (Pb)-Free

Applications

• DDR Memory Termination Supply

• Active Termination Buses

• Desktop PC/AGP Graphics

• Set Top Box/IPC

• Supply Splitter