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The number of voltage regulators currently available makes the introducTIon of another regulator seem almost unnecessary. However, a new device, the LT®1005, offers auxiliary funcTIons which help solve problems often associated with voltage regulaTIon in circuits.
The LT1005 (Figure 1) consists of a 5V, 1A1 regulator, which is controlled by a posiTIve logic enable pin, and a 5V auxiliary regulator. The auxiliary regulator’s output is unaffected by the state of the main regulator. Thermal overload protection and current limiting round out the device. The enable pin is a high impedance input which floats in a high state. 10μA1 of current pulled from the pin will force it below its 1.6V turn-off threshold, shutting down the main output. Figure 2a shows a simple but useful application. Here, the regulator’s enable pin is controlled by the state of a toggling flip-flop which is triggered by a pushbutton on a computer keyboard. The auxiliary 5V output powers
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