JP4658481B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
- Publication number
- JP4658481B2 JP4658481B2 JP2004008779A JP2004008779A JP4658481B2 JP 4658481 B2 JP4658481 B2 JP 4658481B2 JP 2004008779 A JP2004008779 A JP 2004008779A JP 2004008779 A JP2004008779 A JP 2004008779A JP 4658481 B2 JP4658481 B2 JP 4658481B2
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- Prior art keywords
- field effect
- semiconductor
- effect transistor
- semiconductor device
- semiconductor chip
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Description
本実施の形態1の半導体装置は、例えばデスクトップ型のパーソナルコンピュータ、ノート型のパーソナルコンピュータ、サーバまたはゲーム機等の電源回路に用いられる非絶縁型DC−DCコンバータである。図1は、その非絶縁型DC−DCコンバータ1の回路図の一例を示している。非絶縁型DC−DCコンバータ1は、制御回路2、ドライバ回路3a,3b、パワーMOS・FET(以下、単にパワーMOSという)Q1(第1電界効果トラジスタ),Q2(第2電界効果トランジスタ)、コイルL1、コンデンサC1等のような素子を有している。これら素子は、配線基板に実装され、配線基板の配線を通じて電気的に接続されている。なお、図1の符号の4は、上記デスクトップ型のパーソナルコンピュータ、ノート型のパーソナルコンピュータ、サーバまたはゲーム機等のCPU(Central Processing Unit)またはDSP(Digital Signal Processor)等のような負荷回路を示している。符合のET1,ET2は端子を示している。
図20は本発明の他の実施の形態である非絶縁型DC−DCコンバータ1の一部の回路を含むパッケージ6aの構成例の平面図、図21は図20のY1−Y1線の断面図である。なお、図20でも、図面を見易くするため、一部の封止部材8を取り除いて示すとともに、ダイパッド7a1,7a2およびリード7bにハッチングを付した。
図22は本発明の他の実施の形態である非絶縁型DC−DCコンバータ1の一部の回路を含むパッケージ6aの構成例の平面図、図23は図22のY1−Y1線の断面図である。なお、図22でも、図面を見易くするため、一部の封止部材8を取り除いて示すとともに、ダイパッド7a1,7a2およびリード7bにハッチングを付した。
DC−DCコンバータの大電流化および高周波化に起因する他の問題として動作時の熱の問題がある。特に、前記実施の形態1〜3での説明では、2つの半導体チップ5a,5bを1つのパッケージ6aに収容する構成なので、高い放熱性が必要となる。本実施の形態4では、その放熱性を考慮した構成について説明する。
本実施の形態5では、前記放熱構成の変形例について説明する。
本実施の形態6では、前記放熱構成の変形例について説明する。
2 制御回路
3a ドライバ回路
3b ドライバ回路
4 負荷回路
5a 半導体チップ(第1の半導体チップ)
5b 半導体チップ(第2の半導体チップ)
5c〜5k 半導体チップ
6a パッケージ
6c〜6i パッケージ
7a1,7a2 ダイパッド
7b1〜7b3 リード
10a,10b 半導体基板
10bep エピタキシャル層
11a ゲート絶縁膜
12a p+型の半導体領域
13a p-型の半導体領域
13b p+型の半導体領域
14a n-型の半導体領域
14b n+型の半導体領域
17 ドレイン電極
18n1 n型の半導体領域
18n2 n+型の半導体領域
18p p型の半導体領域
19 溝
20 キャップ絶縁膜
23 配線基板
24,25 パッケージ
26,27 チップ部品
28a,28b 配線
28c,28d 配線(出力配線)
28e 配線
30 金属板配線
31 バンプ電極
33 リボン配線
35 接着材
36 絶縁シート
37 放熱フィン
40 金属体
41 接着材
50,50A〜50D 非絶縁型DC−DCコンバータ
Q1 パワーMOS・FET(第1電界効果トランジスタ)
Q2 パワーMOS・FET(第2電界効果トランジスタ)
Q3,Q4 パワーMOS・FET
Q50 パワーMOS・FET
L1 コイル
C1 コンデンサ
ET1〜ET4 端子
G1〜G4 ゲート電極
SR1〜SR4 ソース領域
DR1〜DR4 ドレイン領域
Vin 入力電圧
VgH,VgL ゲート電圧
BP,BP1〜BP7 ボンディングパッド
WR ボンディングワイヤ
NWL nウエル
PWL pウエル
CH1 チャネル形成領域
Claims (15)
- 樹脂封止体と、
前記樹脂封止体の外部に露出し、かつ、第1の電源電位を供給する第1の電源端子と、
前記樹脂封止体の外部に露出し、かつ、前記第1の電源電位より低い第2の電源電位を供給する第2の電源端子と、
前記樹脂封止体の外部に露出し、かつ、制御信号を供給する制御端子と、
前記樹脂封止体の外部に露出する出力端子と、
前記第1の電源端子と前記出力端子との間にソース・ドレイン経路が直列接続された第1電界効果トランジスタと、
前記出力端子と前記第2の電源端子との間にソース・ドレイン経路が直列接続された第2電界効果トランジスタと、
前記制御端子に接続され、かつ、前記制御信号によって前記第1電界効果トランジスタのゲート電極を制御する第1の制御回路と、
前記制御端子に接続され、かつ、前記制御信号によって前記第2電界効果トランジスタのゲート電極を制御する第2の制御回路とを有し、
前記第1電界効果トランジスタ及び前記第1の制御回路が第1の半導体チップにより形成され、
前記第2電界効果トランジスタが前記第1の半導体チップと異なる第2の半導体チップにより形成され、
前記第1の半導体チップは、前記第2電界効果トランジスタのゲート電極を制御する前記第2の制御回路を有し、
前記第1及び第2の半導体チップは、前記樹脂封止体内に封止されていることを特徴とする半導体装置。 - 請求項1記載の半導体装置において、前記第1電界効果トランジスタは、第1主面と前記第1主面に対向する第2主面とを有する半導体基板と、前記半導体基板の第1主面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たゲート電極と、前記第1主面に形成され、かつ、前記ゲート電極の両端に形成されたソース及びドレイン用の半導体領域と、前記第1主面及び前記ゲート電極下に形成され、かつ、前記ソース及びドレイン用の半導体領域間に形成されたチャンネル形成用の半導体領域を有することを特徴とする半導体装置。
- 請求項1記載の半導体装置において、前記第2電界効果トランジスタのオン抵抗は、前記第1電界効果トランジスタのオン抵抗よりも小さいことを特徴とする半導体装置。
- 請求項3記載の半導体装置において、前記第2電界効果トランジスタのオン時間は、前記第1電界効果トランジスタのオン時間よりも長いことを特徴とする半導体装置。
- 請求項1記載の半導体装置において、前記第2の半導体チップにはダイオードが形成されており、前記ダイオードのアノードは、前記第2電界効果トランジスタのソースと電気的に接続され、前記ダイオードのカソードは、前記第2電界効果トランジスタのドレインと電気的に接続されていることを特徴とする半導体装置。
- 請求項1記載の半導体装置において、前記第1の半導体チップは第1のチップ搭載部材に搭載され、前記第2の半導体チップは第2のチップ搭載部材に搭載されており、
前記第1のチップ搭載部材および前記第2のチップ搭載部材の一部を、前記樹脂封止体の外部に露出させたことを特徴とする半導体装置。 - 請求項1記載の半導体装置において、前記第1の半導体チップおよび前記第2の半導体チップの主面に金属体を設け、前記金属体の一部を前記樹脂封止体の外部に露出させたことを特徴とする半導体装置。
- 請求項7記載の半導体装置において、前記金属体を前記第1の半導体チップおよび前記第2の半導体チップの電極と電気的に接続するとともにリードと電気的に接続したことを特徴とする半導体装置。
- 請求項1記載の半導体装置において、前記第1電界効果トランジスタと前記第2電界効果トランジスタとの直列回路がDC−DCコンバータの一部を構成する回路であることを特徴とする半導体装置。
- ハイサイドスイッチ用のパワートランジスタが形成された第1の半導体チップと、前記ハイサイドスイッチ用のパワートランジスタに直列に接続されるローサイドスイッチ用のパワートランジスタが形成された第2の半導体チップとを同一のパッケージに備え、
前記第1の半導体チップに、前記ハイサイドスイッチ用のパワートランジスタを駆動する第1駆動回路と、前記ローサイドスイッチ用のパワートランジスタを駆動する第2駆動回路とを設け、
前記ハイサイドスイッチ用のパワートランジスタを横型のパワーMOS・FETにより形成し、前記ローサイドスイッチ用のパワートランジスタを縦型のパワーMOS・FETにより形成したことを特徴とする半導体装置。 - 請求項10記載の半導体装置において、前記第1の半導体チップは第1のチップ搭載部材に搭載され、前記第2の半導体チップは第2のチップ搭載部材に搭載されており、
前記第1のチップ搭載部材および前記第2のチップ搭載部材の一部を、前記パッケージの外部に露出させたことを特徴とする半導体装置。 - 請求項10記載の半導体装置において、前記第1の半導体チップおよび前記第2の半導体チップの主面に金属体を設け、前記金属体の一部を前記パッケージの外部に露出させたことを特徴とする半導体装置。
- 請求項12記載の半導体装置において、前記金属体を前記第1の半導体チップおよび前記第2の半導体チップの電極と電気的に接続するとともにリードと電気的に接続したことを特徴とする半導体装置。
- 請求項5記載の半導体装置において、
前記第1電界効果トランジスタのソースと、前記第2電界効果トランジスタのドレインとを結ぶ配線には、電源回路の出力配線が電気的に接続されており、
(a)前記第1電界効果トランジスタをオンすると、前記第1電界効果トランジスタのドレインに電気的に接続された前記第1の電源電位から前記第1電界効果トランジスタを通じて前記出力配線に第1の電流が流れ、
(b)前記第1電界効果トランジスタをオフすると、前記第2電界効果トランジスタのソースに電気的に接続された前記第2の電源電位から前記ダイオードを通じて前記出力配線に第2の電流が流れ、
(c)前記第2電界効果トランジスタをオンすると、前記第2の電源電位から前記第2電界効果トランジスタを通じて前記出力配線に第3の電流が流れるような構成を有することを特徴とする半導体装置。 - 請求項1記載の半導体装置において、前記第2電界効果トランジスタは、第1主面と前記第1主面に対向する第2主面とを有する半導体基板と、前記半導体基板の第1主面から第2主面に向かって形成された溝と、前記溝の内壁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ゲート電極と、前記第1主面に形成され、かつ、前記ゲート電極の両端に形成されたソース用の半導体領域と、前記ゲート電極の側面に形成され、かつ、前記ソース及びドレイン用の半導体領域間に形成されたチャンネル形成用の半導体領域と、前記第2主面に形成されたドレイン用の半導体領域を有することを特徴とする半導体装置。
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US11/030,978 US20050156204A1 (en) | 2004-01-16 | 2005-01-10 | Semiconductor device |
CNA2005100017183A CN1641887A (zh) | 2004-01-16 | 2005-01-14 | 半导体器件 |
CNA2008101696109A CN101373764A (zh) | 2004-01-16 | 2005-01-14 | 半导体器件 |
US12/247,326 US8044468B2 (en) | 2004-01-16 | 2008-10-08 | Semiconductor device |
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