Integrated power switch structure having a vertical thyristor controlled by a lateral MOS transistor
First Claim
1. An integrated power switch structure, which comprises a vertical thyristor controlled by a lateral MOS transistor, wherein said thyristor is constructed as a four-layer thyristor comprising an anode layer, a first base layer doped contrary to said anode layer, an additional base layer doped contrary to said first base layer, and a cathode layer, characterized in thatin the main current path of the said power switch structure, said lateral MOS transistor has its drain-source path connected in series with the cathode-anode path of the thyristor,a buried oxide layer insulates at least a source electrode of the lateral MOS transistor against the substrate, and the first base layer is arranged below said source electrode.
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Abstract
An integrated power switch structure comprises a lateral MOS transistor (3) and a lateral or vertical thyristor (2). The drain-source path of the lateral MOS transistor (3) is in series with the cathode-anode path of the thyristor (2). In order to ensure that the power switch structure reliably switches on and off with great dielectric strength and low switch-on resistance, at least the source electrode of the lateral MOS transistor (3) is insulated against the substrate (7) by means of a buried oxide layer (8) in accordance with the present invention.
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10 Claims
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1. An integrated power switch structure, which comprises a vertical thyristor controlled by a lateral MOS transistor, wherein said thyristor is constructed as a four-layer thyristor comprising an anode layer, a first base layer doped contrary to said anode layer, an additional base layer doped contrary to said first base layer, and a cathode layer, characterized in that
in the main current path of the said power switch structure, said lateral MOS transistor has its drain-source path connected in series with the cathode-anode path of the thyristor, a buried oxide layer insulates at least a source electrode of the lateral MOS transistor against the substrate, and the first base layer is arranged below said source electrode.
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