The ARX series of low noise DC voltage regulators is a new line of ultra highly reliable microcircuits designed for military and aerospace applications. These regulators utilize advanced multichip module design techniques to provide state-of-the-art performance features with no sacrifice in reliability. The ARX series regulators can be used in applications where minimum size and maximum output power is required. These regulators are designed to operate over the full military operating case temperature range of -55C to +125C. Outstanding high frequency ripple rejection, input overshoot rejection and input noise rejection are features of the ARX series that are not available from monolithic regulators.