JP2011198891A - 半導体基板および半導体装置 - Google Patents
半導体基板および半導体装置 Download PDFInfo
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Abstract
【解決手段】半導体基板において、半導体基板1は、主電流領域2と主電流領域2に流れる主電流より小さい電流が流れる電流センス領域3を有し、主電流領域2は、主面にソース電極8が配置され、ソース電極8はp型半導体領域(ボディ)6とn+型半導体領域(ソース)7に接触し、電流センス領域3は、主面にMOSFET電流検出用電極10およびダイオード電流検出用電極11が配置され、MOSFET電流検出用電極10はp型半導体領域(ボディ)6とn+型半導体領域(ソース)7に接触し、ダイオード電流検出用電極11はp型半導体領域(ボディ)6に接触する。
【選択図】図1
Description
図1により、本発明の実施の形態1に係る半導体基板の構成について説明する。図1は本発明の実施の形態1に係る半導体基板の構成を示す断面図であり、トレンチゲート型MOSFETの断面図を示している。
実施の形態2は、実施の形態1において、MOSFET電流検出用電極10をn+型半導体領域7(ソース)のみに接触させたものである。
実施の形態1では、ダイオードのリカバリー電流とMOSFETの電流を検出して、デッドタイムを最適化する手法について述べたが、実際のスイッチング電源装置のスイッチング回路では、ハイサイドとローサイドのMOSFETは高速にスイッチングするため、ハイサイドMOSFETがターンオンした直後の電流は振動が大きく、電流の絶対値を高精度に検出することは難しい。
実施の形態4は、実施の形態1、2の半導体基板1を半導体チップ上に搭載したものである。
実施の形態5は実施の形態4において、センスMOSFET用のワイヤ47とセンスダイオード用のワイヤ48を半導体チップ41のリードフレーム端子に接続し、半導体チップ41の外部で電流検出を行い、ドライバIC42に入力させるものである。
実施の形態6は、スイッチング電源装置のローサイドMOSFETに実施の形態1、2の半導体基板1を使用したものである。
Claims (10)
- 基板の主面の第1半導体領域と、
前記第1半導体領域上に形成され、前記第1半導体領域と逆の導電型を持つ第2半導体領域と、
前記第2半導体領域内に形成され、前記第1半導体領域と同一の導電型を持つ第3半導体領域と、
前記第1半導体領域、前記第2半導体領域および前記第3半導体領域内に形成され、前記基板の主面の第1方向に延在する溝と、
前記溝内に形成された第1絶縁膜と、
前記第1絶縁膜上に形成された第1導電体とを備えた半導体基板であって、
前記半導体基板は、主電流領域と前記主電流領域に流れる主電流より小さい電流が流れる電流検出領域を有し、
前記主電流領域は、主面に第2導電体が配置され、前記第2導電体は前記第2半導体領域と前記第3半導体領域に接触し、
前記電流検出領域は、主面に第3導電体および第4導電体が配置され、前記第3導電体は前記第2半導体領域と前記第3半導体領域に接触し、前記第4導電体は前記第2導電体に接触することを特徴とする半導体基板。 - 基板の主面の第1半導体領域と、
前記第1半導体領域上に形成され、前記第1半導体領域と逆の導電型を持つ第2半導体領域と、
前記第2半導体領域内に形成され、前記第1半導体領域と同一の導電型を持つ第3半導体領域と、
前記第1半導体領域、第2半導体領域および第3半導体領域内に形成され、前記基板の主面の第1方向に延在する溝と、
前記溝内に形成された第1絶縁膜と、
前記第1絶縁膜上に形成された第1導電体とを備えた半導体基板であって、
前記半導体基板は、主電流領域と前記主電流領域に流れる主電流より小さい電流が流れる電流検出領域を有し、
前記主電流領域は、主面に第2導電体が配置され、前記第2導電体は前記第2半導体領域と前記第3半導体領域に接触し、
前記電流検出領域は、主面に第3導電体および第4導電体が配置され、前記第3導電体は前記第3半導体領域に接触し、前記第4導電体は前記第2導電体に接触し、
前記電流検出領域の前記溝の間隔は、前記主電流領域の前記溝の間隔より長いことを特徴とする半導体基板。 - 電圧入力端子と基準電位端子との間に直列に接続される第1のスイッチング素子および第2のスイッチング素子と、前記第1のスイッチング素子および前記第2のスイッチング素子を駆動する駆動素子とを同一パッケージに実装し、前記駆動素子により前記第1のスイッチング素子および前記第2のスイッチング素子を相補的にオン、オフ制御する半導体チップであって、
前記第2のスイッチング素子は、請求項1に記載の半導体基板または請求項2に記載の半導体基板から構成され、少なくとも4つのパッドを有し、
前記4つのパッドはゲート用パッド、ソース用パッド、電流検出用パッド、およびボディダイオード電流検出用パッドで構成され、
前記ゲート用パッド、前記ソース用パッド、前記電流検出用パッド、および前記ボディダイオード電流検出用パッドは、それぞれ、前記半導体基板の第1導電体、第2導電体、第3導電体、および第4導電体に接続され、
前記駆動素子と前記4つのパッドはボンディングワイヤで接続されたことを特徴とする半導体チップ。 - 電圧入力端子と基準電位端子との間に直列に接続される第1のスイッチング素子および第2のスイッチング素子と、前記第1のスイッチング素子および前記第2のスイッチング素子を駆動する駆動素子とを同一パッケージに実装し、前記駆動素子により前記第1のスイッチング素子および前記第2のスイッチング素子を相補的にオン、オフ制御する半導体チップであって、
前記第1のスイッチング素子および前記第2のスイッチング素子は、請求項1に記載の半導体基板または請求項2に記載の半導体基板から構成され、それぞれ少なくとも4つのパッドを有し、
前記4つのパッドはゲート用パッド、ソース用パッド、電流検出用パッド、およびボディダイオード電流検出用パッドで構成され、
前記ゲート用パッド、前記ソース用パッド、前記電流検出用パッド、および前記ボディダイオード電流検出用パッドは、それぞれ、前記半導体基板の第1導電体、第2導電体、第3導電体、および第4導電体に接続され、
前記駆動素子と前記第1のスイッチング素子および前記第2のスイッチング素子の前記4つのパッドはボンディングワイヤで接続されたことを特徴とする半導体チップ。 - 請求項3または4に記載の半導体チップにおいて、
前記駆動素子は、内部に前記電流検出用パッドと接続される第1の抵抗、および前記ボディダイオード電流検出用パッドに接続される第2の抵抗を有し、前記第1の抵抗および前記第2の抵抗の両端電圧を検出し、前記第1のスイッチング素子および前記第2のスイッチング素子のデッドタイムを制御することを特徴とする半導体チップ。 - 請求項5に記載の半導体チップにおいて、
前記駆動素子は、前記第1の抵抗および前記第2の抵抗の両端電圧をローパスフィルタを介して検出することを特徴とする半導体チップ。 - 電圧入力端子と基準電位端子との間に直列に接続される第1のスイッチング素子および第2のスイッチング素子と、前記第1のスイッチング素子および前記第2のスイッチング素子を駆動する駆動素子とを同一パッケージに実装し、前記駆動素子により前記第1のスイッチング素子および前記第2のスイッチング素子を相補的にオン、オフ制御する半導体チップであって、
前記第2のスイッチング素子は、請求項1に記載の半導体基板または請求項2に記載の半導体基板から構成され、少なくとも4つのパッドを有し、
前記4つのパッドはゲート用パッド、ソース用パッド、電流検出用パッド、およびボディダイオード電流検出用パッドで構成され、
前記ゲート用パッド、前記ソース用パッド、前記電流検出用パッド、および前記ボディダイオード電流検出用パッドは、それぞれ、前記半導体基板の第1導電体、第2導電体、第3導電体、および第4導電体に接続され、
前記駆動素子と前記ソース用パッドおよび前記ゲート用パッドはボンディングワイヤで接続され、前記電流検出用パッドおよび前記ボディダイオード電流検出用パッドは、前記半導体チップのリードフレーム端子とボンディングワイヤで接続されたことを特徴とする半導体チップ。 - 電圧入力端子と基準電位端子との間に直列に接続される第1のスイッチング素子および第2のスイッチング素子と、前記第1のスイッチング素子および前記第2のスイッチング素子を駆動する駆動素子とを同一パッケージに実装し、前記駆動素子により前記第1のスイッチング素子および前記第2のスイッチング素子を相補的にオン、オフ制御する半導体チップであって、
前記第1のスイッチング素子および前記第2のスイッチング素子は、請求項1に記載の半導体基板または請求項2に記載の半導体基板から構成され、それぞれ少なくとも4つのパッドを有し、
前記4つのパッドはゲート用パッド、ソース用パッド、電流検出用パッド、およびボディダイオード電流検出用パッドで構成され、
前記ゲート用パッド、前記ソース用パッド、前記電流検出用パッド、および前記ボディダイオード電流検出用パッドは、それぞれ、前記半導体基板の第1導電体、第2導電体、第3導電体、および第4導電体に接続され、
前記駆動素子と前記第1のスイッチング素子および前記第2のスイッチング素子の前記ソース用パッドおよび前記ゲート用パッドはボンディングワイヤで接続され、前記第1のスイッチング素子および前記第2のスイッチング素子の前記電流検出用パッドおよび前記ボディダイオード電流検出用パッドは、前記半導体チップのリードフレーム端子とボンディングワイヤで接続されたことを特徴とする半導体チップ。 - 請求項7または8に記載の半導体チップにおいて、
前記電流検出用パッドおよび前記ボディダイオード電流検出用パッドが接続された前記リードフレーム端子にそれぞれ第1の抵抗および第2の抵抗が接続され、
前記駆動素子は、前記第1の抵抗および前記第2の抵抗の両端電圧を検出し、前記第1のスイッチング素子および前記第2のスイッチング素子のデッドタイムを制御することを特徴とする半導体チップ。 - 請求項9に記載の半導体チップにおいて、
前記駆動素子は、前記第1の抵抗および前記第2の抵抗の両端電圧をローパスフィルタを介して検出することを特徴とする半導体チップ。
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