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Bootstrap circuit for driving a power MOS transistor

  • US 5,381,044 A
  • Filed: 07/22/1992
  • Issued: 01/10/1995
  • Est. Priority Date: 07/24/1991
  • Status: Expired due to Term
First Claim
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1. Bootstrap circuit for a power MOS transistor having a drain connected to a power supply terminal and a source connected to a load, comprising a first capacitor chargeable to a first voltage which is a function of the supply voltage of the power transistor, wherein said first capacitor has a first terminal connected to the load and a second terminal connected to said power supply through a first diode and to the gate of the power MOS transistor through first switching means controlled by an activating signal, and including a second capacitor having a first terminal connected to the second terminal of the first capacitor through a second diode and a second terminal connected to ground through second switching means, and further including means, connected to said second terminal of said second capacitor and said second switching means for generating a second voltage on said second capacitor which is higher than said first voltage by an amount at least as great as a threshold voltage of the power MOS transistor.

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