JP5674530B2 - 半導体装置の制御装置 - Google Patents
半導体装置の制御装置 Download PDFInfo
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- JP5674530B2 JP5674530B2 JP2011077681A JP2011077681A JP5674530B2 JP 5674530 B2 JP5674530 B2 JP 5674530B2 JP 2011077681 A JP2011077681 A JP 2011077681A JP 2011077681 A JP2011077681 A JP 2011077681A JP 5674530 B2 JP5674530 B2 JP 5674530B2
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- 239000004065 semiconductor Substances 0.000 title claims description 118
- 239000002184 metal Substances 0.000 claims description 24
- 239000000758 substrate Substances 0.000 claims description 22
- 239000004020 conductor Substances 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 13
- 239000003990 capacitor Substances 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
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Description
図1により、本発明の実施の形態1に係る半導体装置の制御装置により制御される半導体装置の構成について説明する。図1は本発明の実施の形態1に係る半導体装置の制御装置により制御される半導体装置の構成を示す構成図であり、第2ゲート電極を設けた中抜きゲート型プレーナMOSFETの断面図を示している。
図4により、本発明の実施の形態2に係る半導体装置の制御装置により制御される半導体装置の構成について説明する。図4は本発明の実施の形態2に係る半導体装置の制御装置により制御される半導体装置の構成を示す構成図であり、第2ゲート電極を設けた中抜きゲート型プレーナMOSFET、または第2ゲート電極を設けたトレンチMOSFETのチップの平面図を示している。
図5により、本発明の実施の形態3に係る半導体装置の制御装置により制御される半導体装置の構成について説明する。図5は本発明の実施の形態3に係る半導体装置の制御装置により制御される半導体装置の構成を示す構成図であり、第2ゲート電極を設けたトレンチMOSFETの断面図を示している。
中抜きゲート型プレーナMOSFET、トレンチMOSFETともに、第2ゲート電極7を設けることで、オン抵抗と帰還容量をともに低減することができるが、端子数が従来の3から4に増加するので、制御が複雑になるという課題がある。
実施の形態1〜実施の形態4の少なくとも1つ以上の、半導体装置の制御装置による駆動シーケンスを、VR(例えば、上述の非特許文献2、3を参照)のハイサイドのMOSFETまたはローサイドのMOSFETに適用することで、VRの損失を低減させることができる。
実施の形態6は、実施の形態1における、ターンオンの際のゲート電極8と第2ゲート電極7の制御と、ターンオフの際の第2ゲート電極7とゲート電極の制御の両方の制御を、ターンオンとターンオフのどちらかの制御のみにしたものである。
図9により、本発明の実施の形態7に係る半導体装置の制御装置を含む電源について説明する。図9は本発明の実施の形態7に係る半導体装置の制御装置を含む電源の回路構成を示す構成図であり、半導体装置のゲートと第2ゲートを制御する回路を有している。
ただし、Vinは入力直流電圧60、Tは駆動部(1)70から出力されるパルス信号の周期、TONは周期TのうちMOSFET62が導通の時間を示す。すなわち、TON/Tはデューティ比を示す。
Claims (8)
- 半導体基板と、前記半導体基板の裏面に形成されたドレイン電極と、前記半導体基板の表面上に形成された複数のウェル領域と、前記半導体基板の表面上に形成され、前記ウェル領域と逆の導電型を有する第1の半導体領域と、前記ウェル領域内に形成された複数のソース領域と、前記ウェル領域および前記第1の半導体領域上に形成されたゲート絶縁膜と、前記ゲート絶縁膜上に形成され、前記ゲート絶縁膜を介して前記ウェル領域と対向配置された第1のゲート電極と、前記ソース領域と電気的に接続されるソース電極と、前記第1の半導体領域の真上に形成された、前記第1のゲート電極の開口部と、前記開口部内の前記第1の半導体領域に、絶縁膜を介して設けられた第2のゲート電極と、を有する半導体装置の駆動制御を行う半導体装置の制御装置であって、
前記第1のゲート電極にオンまたはオフの制御信号を出力する際、前記第2のゲート電極が前記ソース電極と同じ電位となるように、前記第2のゲート電極を駆動制御し、
前記半導体装置をオフに駆動制御する際、前記第2のゲート電極にオフの制御信号を出力した後、前記第1のゲート電極にオフの制御信号を出力することを特徴とする半導体装置の制御装置。 - 半導体基板と、前記半導体基板の裏面に形成されたドレイン電極と、前記半導体基板の表面上に形成された複数のウェル領域と、前記半導体基板の表面上に前記ウェル領域より深い領域に形成され、前記ウェル領域と逆の導電型を有する第1の半導体領域と、前記ウェル領域内に形成された複数のソース領域と、前記ソース領域と前記ウェル領域を貫通して、前記第1の半導体領域に達するトレンチと、前記トレンチの側面と底面に形成されたゲート絶縁膜と、前記ゲート絶縁膜上に形成された第1のゲート電極と、前記ソース領域と電気的に接続されるソース電極と、前記第1のゲート電極の下に設けられ、前記第1のゲート電極および前記第1の半導体領域とは絶縁膜を介して接続された第2のゲート電極を有する半導体装置の駆動制御を行う半導体装置の制御装置であって、
前記第1のゲート電極にオンまたはオフの制御信号を出力する際、前記第2のゲート電極が前記ソース電極と同じ電位となるように、前記第2のゲート電極を駆動制御し、
前記半導体装置をオフに駆動制御する際、前記第2のゲート電極にオフの制御信号を出力した後、前記第1のゲート電極にオフの制御信号を出力することを特徴とする半導体装置の制御装置。 - 半導体基板と、前記半導体基板の裏面に形成されたドレイン電極と、前記半導体基板の表面上に形成された複数のウェル領域と、前記半導体基板の表面上に形成され、前記ウェル領域と逆の導電型を有する第1の半導体領域と、前記ウェル領域内に形成された複数のソース領域と、前記ウェル領域および前記第1の半導体領域上に形成されたゲート絶縁膜と、前記ゲート絶縁膜上に、前記ゲート絶縁膜を介して前記ウェル領域と対向する位置に形成された第1のゲート電極と、前記ソース領域と電気的に接続されるソース電極と、前記第1の半導体領域の真上に形成された、前記第1のゲート電極の開口部と、前記開口部内の前記第1の半導体領域に、絶縁膜を介して設けられた第2のゲート電極と、を有する半導体装置の駆動制御を行う半導体装置の制御装置であって、
前記第1のゲート電極にオンまたはオフの制御信号を出力する際、前記第2のゲート電極が前記ソース電極と同じ電位となるように、前記第2のゲート電極を駆動制御し、
前記半導体装置は、前記半導体基板の表面上に前記第1のゲート電極に電気的に接続された第1のゲート電極パッドと、前記第1のゲート電極パッドに電気的に接続された金属配線と、前記第2のゲート電極に電気的に接続された第2のゲート電極パッドと、前記第2のゲート電極パッドに電気的に接続された金属配線を有し、前記第1のゲート電極パッドに電気的に接続された金属配線の表面積が、前記第2のゲート電極パッドに電気的に接続された金属配線の表面積より大きいことを特徴とする半導体装置の制御装置。 - 半導体基板と、前記半導体基板の裏面に形成されたドレイン電極と、前記半導体基板の表面上に形成された複数のウェル領域と、前記半導体基板の表面上に前記ウェル領域より深い領域に形成され、前記ウェル領域と逆の導電型を有する第1の半導体領域と、前記ウェル領域内に形成された複数のソース領域と、前記ソース領域と前記ウェル領域を貫通して、前記第1の半導体領域に達するトレンチと、前記トレンチの側面と底面に形成されたゲート絶縁膜と、前記ゲート絶縁膜上に形成された第1のゲート電極と、前記ソース領域と電気的に接続されるソース電極と、前記第1のゲート電極の下に設けられ、前記第1のゲート電極および前記第1の半導体領域とは絶縁膜を介して接続された第2のゲート電極を有する半導体装置の駆動制御を行う半導体装置の制御装置であって、
前記第1のゲート電極にオンまたはオフの制御信号を出力する際、前記第2のゲート電極が前記ソース電極と同じ電位となるように、前記第2のゲート電極を駆動制御し、
前記半導体装置は、前記半導体基板の表面上に前記第1のゲート電極に電気的に接続された第1のゲート電極パッドと、前記第1のゲート電極パッドに電気的に接続された金属配線と、前記第2のゲート電極に電気的に接続された第2のゲート電極パッドと、前記第2のゲート電極パッドに電気的に接続された金属配線を有し、前記第1のゲート電極パッドに電気的に接続された金属配線の表面積が、前記第2のゲート電極パッドに電気的に接続された金属配線の表面積より大きいことを特徴とする半導体装置の制御装置。 - 請求項1〜4のいずれか1項に記載の半導体装置の制御装置において、
前記半導体装置をオンに駆動制御する際、前記第1のゲート電極にオンの制御信号を出力した後、前記第2のゲート電極にオンの制御信号を出力することを特徴とする半導体装置の制御装置。 - 請求項1〜5のいずれか1項に記載の半導体装置の制御装置において、
前記半導体装置の制御装置は、前記半導体装置と共に、1つのパッケージに搭載されることを特徴とする半導体装置の制御装置。 - 請求項6に記載の半導体装置の制御装置において、
前記半導体装置の第1のゲート電極パッドと前記半導体装置の制御装置とを接続する導体と、前記半導体装置のソース電極と前記半導体装置の制御装置とを接続する導体が隣り合って配置されることを特徴とする半導体装置の制御装置。 - 請求項1〜7のいずれか1項に記載の半導体装置の制御装置において、
前記半導体装置の制御装置は、電圧入力端子と基準電位端子との間に直列に接続された第1の半導体装置および第2の半導体装置を相補的にオン、オフ制御して、前記第1の半導体装置および前記第2の半導体装置の接続ノードに接続されるインダクタンス素子に対して電流を流して前記電圧入力端子に印加されている電圧を変換した電圧を出力させる電源装置に搭載され、前記第1の半導体装置および前記第2の半導体装置の駆動制御を行うことを特徴とする半導体装置の制御装置。
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