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Apparatus and method for improving ESD and transient immunity in shunt regulators

  • US 6,775,112 B1
  • Filed: 05/04/2001
  • Issued: 08/10/2004
  • Est. Priority Date: 05/12/2000
  • Status: Active Grant
First Claim
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1. An apparatus for improving immunity from transient events in a shunt circuit that includes a control terminal, the apparatus comprising:

  • a protection circuit that is arranged to couple a fast transient signal to the control terminal in response to a fast transient event such that the shunt circuit is activated in response to the fast transient signal and the shunt circuit is protected from the fast transient event; and

    a plurality of field effect transistors that are arranged to couple power from a power supply terminal to a circuit ground terminal in response to a control voltage that is associated with the control terminal, wherein the protection circuit is arranged to couple the fast transient signal to each gate of each of the plurality of field effect transistors in response to the fast transient event such that each of the plurality of field effect transistors is activated and a fast transient voltage associated with the power supply terminal is discharged to the circuit ground terminal.

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