The RT9173B regulator is designed to convert voltagesupplies ranging from 1.7V to 6V into a desired outputvoltage of which adjusted by two external voltage dividerresistors. The regulator is capable of sourcing or sinkingup to 2A of current while regulating an output voltage towithin 40mV.The RT9173B, used in conjunction with series terminationresistors, provides an excellent voltage source for activetermination schemes of high speed transmission lines asthose seen in high speed memory buses and distributedbackplane designs. The voltage output of the regulator canbe used as a termination voltage for DDR SDRAM.Current limits in both sourcing and sinking mode, plus onchipthermal shutdown make the circuit tolerant of theoutput fault conditions.The RT9173B are available in the popular 5-lead TO-252and fused SOP-8 (the multiple VCNTL pins on the SOP-8package are internally connected but lowest thermalresistance) surface mount packages.