Integrated circuit protection circuit

Details Integrated circuit protection circuit Integrated circuit protection circuit

H - Electricity

02

H

356/24, 323/6

H02H 9/02 (2006.01) G05F 1/569 (2006.01)

Patent

CA 1225699

ABSTRACT OF THE DISCLOSURE: An integrated circuit protection device for use with a voltage regulator used to drive an integrated circuit to prevent damage to the integrated circuit which goes into a "latch up" condition. The inte- grated circuit protection device comprises a first switching circuit, connected to the output of the voltage regulator for selectively connecting the out- put of the voltage regulator to ground and a second switching circuit, connected to the input and the output of the voltage regulator and to the first switching circuit, for detecting a "latch up" condi- tion and for selectively activating the first switch- ing circuit upon detection of a "latch up" condition, whereby the first switching circuit connects the out- put of the voltage regulator to ground and resets the integrated circuit to prevent damage thereto. A pre- determined time after the "latch up" condition is detected, normal operation is automatically restored. In another embodiment, the first switching circuit is included in an adjustable voltage regulator, but is still controlled by the second switching circuit as described hereinbefore. In still another embodiment the protection circuit monitors the input current drawn by a voltage regulator and cuts the current thereto when the current exceeds a predetermined value caused by the "latch up" condition of the inte- grated circuit. The output of the voltage regulator drops to zero and clears the integrated circuit.

458412

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