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Inductive load driving circuit

  • US 6,441,654 B1
  • Filed: 09/06/2000
  • Issued: 08/27/2002
  • Est. Priority Date: 09/08/1999
  • Status: Expired due to Term
First Claim
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1. An inductive load driving circuit formed in an integrated circuit device, the inductive load driving circuit comprising:

  • a first switching transistor connected between a first power supply potential point and a first output terminal;

    a second switching transistor connected between the first power supply potential point and a second output terminal;

    a third switching transistor connected between the first output terminal and a second power supply potential point;

    a fourth switching transistor connected between the second output terminal and the second power supply potential point, wherein one of the third switching transistor and the fourth switching transistor is turned on or off depending on a power supply direction in which power is supplied to an inductive load connected between the first output terminal and the second output terminal, and the first switching transistor or the second switching transistor is controllably turned on and off, to thereby supply an adjusted power in a forward direction or in an inverse direction to the inductive load; and

    a guardring of an N-type semiconductor region provided for at least one of the third switching transistor and the fourth switching transistor, the guardring being connected to the second power supply potential point.

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