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Many DDR termination applications require the bus termination voltage to be stepped down from a higher
system voltage while tracking one-half of a reference voltage. This option is allowable in most systems since a reference voltage is typically available. This circuit shows a solution for a 3.3V to 0.9V, ±3A termination supply with a 1.8V external reference. Stepping down from a higher system voltage has the advantage of reducing the resistive losses due to the internal power switches, thus improving efficiency.