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General
Description
The CM8500A is a switching regulator designed to provide a desired output voltage or termination voltage for various applications by converting voltage supplies ranging from 2.0V to 5.0V. The CM8500A can be implemented to produce regulated output voltages in two different modes. In the default mode, when the VIN/2 pin is open, the output voltage is 50% of the VCCQ. The CM8500A can also be used to produce various user-defined voltages by forcing a voltage on the VIN/2 pin. In this case, the output voltage follows the VIN/2 pin input voltage. The switching regulator is capable of sourcing or sinking up to 3A of current while regulating an output V TT voltage to within 3% or less. The CM8500A, 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
other bus interface standards such as SSTL, CMOS, Rambus ,GTL+,
VME, LV-CMOS, LV-TTL, and PECL. Features
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