JP6568735B2 - スイッチ素子及び負荷駆動装置 - Google Patents
スイッチ素子及び負荷駆動装置 Download PDFInfo
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- 238000001514 detection method Methods 0.000 claims description 79
- 239000000758 substrate Substances 0.000 claims description 27
- 239000004065 semiconductor Substances 0.000 claims description 20
- 239000012535 impurity Substances 0.000 claims description 9
- 230000002123 temporal effect Effects 0.000 description 7
- 230000015556 catabolic process Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010893 electron trap Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 239000000969 carrier Substances 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 210000000746 body region Anatomy 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
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Description
好ましくは、前記非アクティブMOSFET領域は、前記複数のゲート電極の配列方向に対して平行な方向と前記複数のゲート電極の配列方向に対して垂直な方向とにそれぞれ設けるようにして、前記非アクティブMOSFET領域のソース領域にはソースを形成する不純物層とは逆の極性をもつ不純物層が形成されているものである。
また、好ましくは、前記非アクティブMOSFET領域は、前記複数のゲート電極の配列の方向に対して平行に配置された第1の非アクティブMOSFET領域と、 前記複数のゲート電極の配列の方向に対して垂直に配置された第2の非アクティブMOSFET領域を備え、前記第2の非アクティブMOSFET領域にはゲート電極が無く、前記第2の非アクティブMOSFET領域のドレインと前記アクティブMOSFET領域のソースが電気的に接続するようにしたものである。
また、好ましくは、前記電流検出用MOSFETのゲート幅は、前記駆動用MOSFETのゲート幅に比べて1/100以下となるようにしたものである。
2a 非アクティブMOSFET領域(y方向)
2b 非アクティブMOSFET領域(x方向)
3 SOI層
4 Si基板
5 絶縁用トレンチ
6 STI(Shallow Trench Isolation)
7 ドレインを除くSTIが形成されないMOSFET領域
8 Body領域
9a アクティブMOSFET領域と非アクティブMOSFET領域(2a)のドレインドリフト層
9b 非アクティブMOSFET領域(2b)のドレインドリフト層
10 ゲート酸化膜
11a アクティブMOSFET領域と非アクティブMOSFET領域(2a)のゲート電極層
11b 非アクティブMOSFET領域(2b)のゲート電極層
12a アクティブMOSFET領域と非アクティブMOSFET領域(2a)のドレイン
12b 非アクティブMOSFET領域(2b)のドレイン
13 ソース
14 Body接続用の不純物拡散層
15 配線層接続コンタクト
16a ドレイン配線層
16b 非アクティブMOSFET領域(2b)とソースを接続する配線層
17 電流駆動用MOSFETのドレインを接続する配線層
18 電流駆動用MOSFETのゲートと電流検出用MOSFETのゲートを接続する配線層
19 電流駆動用MOSFETのドレインと電流検出用MOSFETのドレインを接続する配線層
20 電流検出用MOSFET
21 電流駆動用MOSFET
22 ハイサイド電流検出回路
23 ローサイド電流検出回路
24 ハイサイド電流駆動用NMOSFET
25 ハイサイド電流検出用NMOSFET
26 ローサイド電流駆動用NMOSFET
27 ローサイド電流検出用NMOSFET
28 抵抗素子
29 電磁負荷
30 昇圧回路
31 電源
32 ハイサイドプリドライバ
33 ローサイドプリドライバ
34 負荷制御装置
Claims (11)
- 複数の制御用電極と、
アクティブ素子領域と、
非アクティブ素子領域と、を備え、
前記非アクティブ素子領域は、前記制御用電極の配列方向に対して平行な方向および前記制御用電極の配列方向に対して垂直な方向に、前記アクティブ素子領域を囲むようにそれぞれ設けられ、
前記制御用電極の配列方向に対して垂直な方向に設けられた非アクティブ素子領域は、前記アクティブ素子領域に対して、前記制御用電極下で隣り合って形成され、
前記非アクティブ素子領域のソース領域には、前記アクティブ素子領域のソースを形成する領域の不純物層とは逆の極性をもつ不純物層が形成されていることを特徴とするスイッチ素子。 - 請求項1記載のスイッチ素子において、
前記スイッチ素子は半導体基板を備え、
前記制御用電極は前記半導体基板上に実装されることを特徴とするスイッチ素子。 - 請求項2記載のスイッチ素子において、
前記スイッチ素子は前記半導体基板上に設けられた絶縁用トレンチを備え、
前記アクティブ素子領域と前記非アクティブ素子領域とは、前記絶縁用トレンチに囲まれるように設けられ、
前記非アクティブ素子領域は、前記絶縁用トレンチと前記アクティブ素子領域との間に設けられていることを特徴とするスイッチ素子。 - 請求項1乃至3のいずれかに記載のスイッチ素子において、
前記スイッチ素子は、電流駆動用スイッチ素子と並列に接続され、前記電流駆動用スイッチ素子による負荷に対する通電電流を検出するための電流検出用スイッチ素子であるスイッチ素子。 - 請求項1乃至4のいずれかに記載のスイッチ素子において、
前記制御用電極はドレインドリフト領域まで延長したフィールドプレート領域を備えるスイッチ素子。 - 請求項3記載のスイッチ素子において、
前記半導体基板はSOI基板であって、前記絶縁用トレンチの深さはSi活性層の厚さに等しく、
前記アクティブ素子領域と前記絶縁用トレンチとの距離が、少なくとも前記絶縁用トレンチの深さより大きくなるように、前記非アクティブ素子領域が形成されていることを特徴とするスイッチ素子。 - 請求項1乃至6のいずれかに記載のスイッチ素子において、
前記非アクティブ素子領域は、
前記制御用電極の配列方向に対して平行に配置された第1の非アクティブ素子領域と、
前記制御用電極の配列方向に対して垂直に配置された第2の非アクティブ素子領域とを備え、
前記第2の非アクティブ素子領域の制御用電極は、前記アクティブ素子領域のソースと電気的に接続されていることを特徴とするスイッチ素子。 - 請求項1乃至6のいずれかに記載のスイッチ素子において、
前記非アクティブ素子領域は、
前記制御用電極の配列方向に対して平行に配置された第1の非アクティブ素子領域と、
前記制御用電極の配列方向に対して垂直に配置された第2の非アクティブ素子領域を備え、
前記第2の非アクティブ素子領域のドレインは、前記アクティブ素子領域のソースと電気的に接続されていることを特徴とするスイッチ素子。 - 請求項4記載のスイッチ素子において、
前記電流検出用スイッチ素子の制御用電極間の間隔は、前記電流駆動用スイッチ素子の制御用電極の間隔に等しいことを特徴とするスイッチ素子。 - 請求項9記載のスイッチ素子において、
前記電流検出用スイッチ素子の制御用電極幅は、前記電流駆動用スイッチ素子の制御用電極幅に比べて1/100以下であることを特徴とするスイッチ素子。 - 電流駆動用スイッチ素子と、前記電流駆動用スイッチ素子に並列に接続されて前記電流駆動用スイッチ素子の通電電流を検出するための電流検出用スイッチ素子と、を有する負荷駆動装置において、
少なくとも前記電流検出用スイッチ素子は、複数の制御用電極と、
アクティブ素子領域と、
非アクティブ素子領域と、を備え、
前記非アクティブ素子領域は、前記制御用電極の配列方向に対して平行な方向および前記制御用電極の配列方向に対して垂直な方向に、前記アクティブ素子領域を囲むようにそれぞれ設けられ、
前記制御用電極の配列方向に対して垂直な方向に設けられた非アクティブ素子領域は、前記アクティブ素子領域に対して、前記制御用電極下で隣り合って形成され、
前記非アクティブ素子領域のソース領域には、前記アクティブ素子領域のソースを形成する領域の不純物層とは逆の極性をもつ不純物層が形成されていることを特徴とすることを特徴とする負荷駆動装置。
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