Voltage Regulator 5962-89981 Failure Analysis

Gideon Analytical Labs received two linear adjustable monolithic silicon 5962-89981 adjustable positive regulators both with no measurable output for failure analysis. A third device was sent with a questionable output. This is a three terminal positive adjustable voltage regulator designed to provide 1.5A with higher efficiency than conventional voltage regulators. The device is designed to operate to 1 Volt input to output differential and the dropout voltage is specified as a function of load current. The device is in a TO-257 hermetic package where Military applications require small size and high reliability.

It was found examining the integrated circuit that a current surge came in pin 1 (the input) and destroyed several trace lines to the adjustable leg of the device. The adjustable leg is controlled by a 5k potentiometer which showed no effect in the analysis.

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