Peak 3A Bus Termination Regulator


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The RT9173/A regulator is designed to convert voltage supplies ranging from 1.6V to 6V into a desired output voltage which adjusted by two external voltage divider resistors. The regulator is capable of sourcing or sinking up to 3A of peak current while regulating an output voltage to within 2% (DDR 1) and 3% (DDR 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.


Key Spec.
RT9173 RT9173A
Status Active Active
Vin (min) (V) 1.6 1.6
Vin (max) (V) 6 6
VTT Output Tolerance (max) (+/- mV) 20 20
Isource/Isink (max) (A) 1.5 3
Standby Current (typ) (mA) 0.05 0.05
Current Limit (typ) (A) 3.7 3.7
Features OCP OCP
Package Type SOP-8;TO-252-5;TO-263-5 SOP-8;TO-252-5;TO-263-5
  • Support Both DDR 1 (1.25VTT) and DDR 2
    (0.9VTT) Requirements
  • SOP-8, TO-252-5 and TO-263-5 Packages
  • Capable of Sourcing and Sinking 3A Peak 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
TitleLast UpdateShareDownload
Peak 3A Bus Termination Regulator2003/12/31
Title Last Update ShareDownload
Peak 3A Bus Termination Regulator 2015/05/19