AT9173

AME AT9173 Bus Termination Regulator n General Description The AT9173 is a voltage regulator which could convert the input voltage ranging from 1.8V to 5V to an output voltage that user settled. The regulator can provide sourcing or sinking current.The AT9173, 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. n Features Support Both DDR I (1.25VTT) and DDR II (0.9VTT) Requirements 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 n Applications DDRI/DDRII Memory Termination Supply Active Termination Buses Desktop PC,NoTebook,Server and workstation Graphic Card Set Top Box Embedded System n Typical Application DDR_2.5V R2 100KΩ C4 0.1uF C2 470uF AT9173A-SOP 8 1 VIN VCNTL 8 2 GND VCNTL 7 3 REFEN VCNTL 6 4 VOUT VCNTL 5 VCC_3.3V DDR_VTT 1.25V/1.5A R4 100KΩ AT9173A SOP-8 C8 4.7uF ...