JP2008140970A - 半導体集積回路及びその製造方法 - Google Patents
半導体集積回路及びその製造方法 Download PDFInfo
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- JP2008140970A JP2008140970A JP2006325458A JP2006325458A JP2008140970A JP 2008140970 A JP2008140970 A JP 2008140970A JP 2006325458 A JP2006325458 A JP 2006325458A JP 2006325458 A JP2006325458 A JP 2006325458A JP 2008140970 A JP2008140970 A JP 2008140970A
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Abstract
【解決手段】半導体集積回路は、半導体基板上(100)に形成されたパワー・トランジスタ(100A)と、パワー・トランジスタ(100A)の直上に形成され、パワー・トランジスタの第1の電極及び第2の電極として機能する複数の第1の金属パターン及び複数の第2の金属パターンと、複数の第1の金属パターンのうち対応する第1の金属パターンと電気的に接続する複数の第1のバス(130,131)と、複数の第2の金属パターンと電気的に接続する単一の第2のバス(150)と、複数の第1のバス(130,131)及び単一の第2のバス(150)に1つづつ設けられたコンタクト・パッド(304)とを備える。
【選択図】図1
Description
まず、半導体集積回路の高速化に対して障害になっているのが、MOSトランジスタ自体の遅延とその上層にある配線による配線遅延である。従来は、ゲート長を短くする微細化技術によってMOSトランジスタ自体の遅延を低減してきたが、MOSトランジスタ自体の遅延が小さくなるに従って配線遅延の問題が顕著になってきている。
次に、半導体集積回路の低消費電力化の障害になっているのが、微細化MOSプロセスを活用して、半導体製品のチップ面積を有効利用しつつ、チップ面積をできるだけ小さくし、パワーデバイスを内蔵したパワー集積回路を実現することにある。このようなパワー集積回路では、低消費電力化の目的で、パワーデバイスを駆動する際に、通常、パルス幅変調(PWM)駆動の技術が用いられる。このPWM駆動では、パワーデバイスのON抵抗を小さくすることが、低消費電力化につながる重要なプロセス技術である。
以下に、本発明の第1の実施形態に係る半導体集積回路及びその製造方法について図面を参照しながら説明する。
=Ra2+Rg2+Rs2=0.38Ω
つまり、各パワー・トランジスタ素子自身に流れる電流密度が均一なるように、ボンディング・ワイヤのワイヤ長と各パワー・トランジスタのサイズ設計とバス設計をすることで、抵抗Rs1を構成するパワー・トランジスタ素子は、ソース・ドレイン間抵抗Rs2を構成するパワー・トランジスタ素子より、2倍の電流を流せることができるようになる。トランジスタサイズが約2倍であるので、各パワー・トランジスタ素子自身に流れる電流密度が均一なる。
以上のことから、リードフレーム307の2端子間のパワー・トランジスタの抵抗は、0.248Ωとなる。
=1/(1/(Ra1+Rg1+Rs1)
+1/(Ra2+Rg2+Rs2))+Ra3+Rh3
なお、以上図1(a)に示した半導体集積回路では、ソース側に2つのバス130、131を配置し、ドレイン側に単一のバス150を配置した構成の場合について説明したが、本実施形態はこれに限定されるものではない。例えば、ソース側のバスの数が3つ又は4つ等であっても同様の効果が得られるし、また、ソース側を単一のバスにすると共にドレイン側を2つのバスにした場合であっても同様の効果が得られることは言うまでもない。つまり、本実施形態では、ソース側又はドレイン側の一方のバスの電流経路を分割するバス配置を有するもので、バス配置が概略上下、概略左右、概略斜めに分割し、複数個分割されている場合のバス配置であっても同様の効果が得られることは言うまでもない。
=Rb2+Rn2+Rs2
=Rb3+Rn3+Rs3=0.355Ω
また、パワー・トランジスタ素子自身のドレイン側に接続される単一のバス150からリードフレーム307に接続されるボンディング・ワイヤ306までの抵抗値は、各ボンディング・ワイヤ306の抵抗成分Rb=0.023Ωと、ソース側のバス抵抗成分Rm=0.046Ωの各シリーズ抵抗値とで示すと、概略下記の式が成り立つようになる。
以上のことから、リードフレーム307の2端子間のパワー・トランジスタの抵抗は、0.188Ωとなる。
リードフレーム2端子間のパワー・トランジスタの抵抗
=1/(1/(Rb1+Rn1+Rs1)
+1/(Rb2+Rn2+Rs2)+1/(Rb3+Rn3+Rs3))
+1/(1/(Rb1+Rm1)+1/(Rb2+Rm2)+1/(Rb3+Rm3))
なお、以上図1(b)に示した半導体集積回路では、ソース側に3つのバス140、141、142を配置し、ドレイン側に単一のバス150を配置した構成の場合について説明したが、本実施形態はこれに限定されるものではない。例えば、ソース側のバスの数が2つ又は4つ等であっても同様の効果が得られるし、また、ソース側を単一のバスにすると共にドレイン側を3つのバスにした場合であっても同様の効果が得られることは言うまでもない。つまり、本実施形態では、ソース側又はドレイン側の一方のバスの電流経路を分割するバス配置を有するもので、バス配置が概略上下、概略左右、概略斜めに分割し、複数個分割されている場合のバス配置であっても同様の効果が得られることは言うまでもない。
以下に、本発明の第2の実施形態に係る半導体集積回路及びその製造方法について図面を参照しながら説明する。
=Ra2+Rh2+Rs2=0.305Ω
また、パワー・トランジスタ素子自身のドレイン側に接続される単一のバス150からリードフレーム307に接続されるボンディング・ワイヤ306までの抵抗値は、各ボンディング・ワイヤ306の抵抗成分と各パワー・トランジスタの素子抵抗とソース側のバス抵抗成分の各シリーズ抵抗値で示すと、概略下記の式が成り立つようになる。
以上のことから、リードフレーム307の2端子間のパワー・トランジスタの抵抗は、1.286Ωとなる。
リードフレーム2端子間のパワー・トランジスタの抵抗
=1/(1/(Ra1+Rh1+Rs1)
+1/(Ra2+Rh2+Rs2))+Ra3+Rh3
なお、以上図5に示した半導体集積回路では、ソース側に2つのバス130、131を配置し、ドレイン側に単一のバス150を配置した構成の場合について説明したが、本実施形態はこれに限定されるものではない。例えば、ソース側のバスの数が3つ又は4つ等であっても同様の効果が得られるし、また、ソース側を単一のバスにすると共にドレイン側を2つのバスにした場合であっても同様の効果が得られることは言うまでもない。つまり、本実施形態では、ソース側又はドレイン側の一方のバスの電流経路を分割するバス配置を有するもので、バス配置が概略上下、概略左右、概略斜めに分割し、複数個分割されている場合のバス配置であっても同様の効果が得られることは言うまでもない。
以下に、本発明の第3の実施形態に係る半導体集積回路及びその製造方法について図面を参照しながら説明する。
=Rh2+Rs2=0.226Ω
一方、図6(b)に示した半導体集積回路では、ソース電極と接続し且つ互いに面積が等しい3つのバス140、141、142が設けられており、各バス140、141、142にはそれぞれ1つのコンタクト・パッド304が配置されており、また、ドレイン電極と接続する単一のバス150には、各バス140、141、142に設けたコンタクト・パッド304と左右対称となるように3つのコンタクト・パッド304が配置されている。
=Rn2+Rs2
=Rn3+Rs3=0.28Ω
また、以上のように、図6(a)及び(b)は、複数のバス(図6(a)では2つのバス130、131、図6(b)では3つのバス140、141、142)が互いに等しい面積を有するように分割されているため、大サイズのバスの金属層のESDによるダメージを低減できる。つまり、リードフレーム307からソース側の複数のバスが均等に分割されていることで、ボンディング・ワイヤ306を介してESDエネルギーが印加されると、均等に分割された抵抗成分をもつ各パワー・トランジスタ素子にかかるESDエネルギーのピーク値は、分割された割合と同様に、ESDエネルギーが分散されるように働く。このため、ESDエネルギーのピーク値で決定されるパワー・トランジスタのESD耐量が向上し、半導体集積回路の信頼性が向上する。
以下に、本発明の第4の実施形態に係る半導体集積回路及びその製造方法について図面を参照しながら説明する。
図7(a)及び(b)に示す第1の変形例は、パワー・トランジスタの能動的領域が分離層によって互いに電気的に分離されていることを特徴とするものである。
図8(a)及び(b)に示す第2の変形例は、リードフレーム側から最も遠い位置のバスに形成するコンタクト・パッドをその一部がはみ出るように形成されていることを特徴とするものである。
図9(a)及び(b)に示す第3の変形例は、リードフレーム側から最も遠い位置のバスに形成するコンタクト・パッドをその全部がはみ出るように形成されていることを特徴とするものである。
以下に、本発明の第5の実施形態に係る半導体集積回路について図面を参照しながら説明する。
100A、100B、100C 能動的領域(パワー・トランジスタ)
130、131、140、141、142、150 金属層(3層目のバス)
11〜16 ソース・ライン 金属層(2層目のバス)
21〜26 ドレイン・ライン 金属層(2層目のバス)
S1〜S15、SN ソース電極用のライン 金属層(1層目のバス)
D1〜D15、DN ドレイン電極用のライン 金属層(1層目のバス)
X ソース電極用のライン(1層目のバス)とソース・ライン(2層目のバス)を接続するビア
Y ドレイン電極用のライン(1層目のバス)とドレイン・ライン(2層目のバス)を接続するビア
X1 ソース・ライン(2層目のバス)とバス(3層目のバス)を接続するビア
Y1 ドレイン・ライン(2層目のバス)とバス(3層目のバス)を接続するビア
202 素子分離領域
304、304a コンタクト・パッド
306 ボンディング・ワイヤ
307 リードフレーム
902a 周辺素子(CMOSトランジスタ)
911 p型シリコン基板
913 n型埋め込み領域
916 p型ウェル領域
917 n型ウェル領域
921 ソース/ドレインコンタクト領域
927 基板コンタクト領域
928 素子分離絶縁体層
930 ゲート酸化物
931 ポリシリコン・ゲート
941 第1のレベル間絶縁体層
942 第1のビア
944 第2のレベル間絶縁体層
947 第3のレベル間絶縁体層
950 第4のレベル間絶縁体層
955 保護用被覆層
956 開口部
961 ボール
100a1、100a2、100a3 分離によって分割された能動的領域
QA_D、QB_D パワー・トランジスタのドレイン
QA_S、QB_S パワー・トランジスタのソース
Q1、Q2、Q3、Q4 パワー・トランジスタ
Q1A_D、Q1B_D、Q2A_D、Q2B_D、Q3A_D、Q3B_D、Q4A_D、Q4B_D パワー・トランジスタのドレイン
Q1A_S、Q1B_S、Q2A_S、Q2B_S、Q3A_S、Q3B_S、Q4A_S、Q4B_S パワー・トランジスタのソース
L1、L2、L3、L4 リードフレーム
180、181、182、183、184、185、186、187 バス
Claims (12)
- 半導体基板上に形成された集積化されたパワー・トランジスタと、
前記パワー・トランジスタの上に形成された層間絶縁膜と、
前記層間絶縁膜中であって前記パワー・トランジスタの直上に形成された第1の金属層からなり、前記パワー・トランジスタの第1の電極として機能する少なくとも1つ以上の第1の金属パターンと、
前記第1の金属層からなり、前記パワー・トランジスタの第2の電極として機能する少なくとも1つ以上の第2の金属パターンと、
前記層間絶縁膜中であって前記第1の金属層の直上に形成された第2の金属層からなり、前記少なくとも1つ以上の第1の金属パターンのうち対応する第1の金属パターンと電気的に接続する少なくとも1つ以上の第1のバスと、
前記第2の金属層からなり、前記少なくとも1つ以上の第2の金属パターンと電気的に接続する単一の第2のバスと、
前記少なくとも1つ以上の第1のバスの各々と前記単一の第2のバスとに1つづつ設けられたコンタクト・パッドとを備えていることを特徴とする半導体集積回路。 - 請求項1に記載の半導体集積回路において、
前記単一の第2のバスには、少なくとも1つ以上のコンタクト・パッドが設けられていることを特徴とする半導体集積回路。 - 請求項1又は2に記載の半導体集積回路において、
前記パワー・トランジスタは、当該半導体集積回路チップのコーナー部に複数個配置されており、
前記少なくとも1つ以上のパワー・トランジスタの直上に配置されたコンタクト・パッドの各々は、接続部材を介して、対応するリードフレームに接続されていることを特徴とする半導体集積回路。 - 請求項1又は2に記載の半導体集積回路において、
前記少なくとも1つ以上の第1のバスの各々は、互いに異なる表面積を有していることを特徴とする半導体集積回路。 - 請求項1又は2に記載の半導体集積回路において、
前記少なくとも1つ以上の第1のバスの各々は、互いに同じ表面積を有していることを特徴とする半導体集積回路。 - 請求項1又は2に記載の半導体集積回路において、
前記パワー・トランジスタは、前記少なくとも1つ以上の第1のバスの各々に対応するように、分離層によって複数に分割されていることを特徴とする半導体集積回路。 - 請求項1又は2に記載の半導体集積回路において、
前記パワー・トランジスタのサイズは、平面的に見て、前記コンタクト・パッドの各々のサイズ以上の大きさを有していることを特徴とする半導体集積回路。 - 請求項7に記載の半導体集積回路において、
前記コンタクト・パッドの各々は、平面的に見て、前記パワー・トランジスタが形成されている領域内に包含されていることを特徴とする半導体集積回路。 - 請求項7に記載の半導体集積回路において、
前記コンタクト・パッドの各々の中には、平面的に見て、前記パワー・トランジスタが形成されている領域内から一部はみ出しているものが存在することを特徴とする半導体集積回路。 - 請求項7に記載の半導体集積回路において、
前記コンタクト・パッドの各々の中には、平面的に見て、前記パワー・トランジスタが形成されている領域内から全部はみ出しているものが存在することを特徴とする半導体集積回路。 - 半導体基板上に集積化されたパワー・トランジスタを形成する工程と、
前記パワー・トランジスタの上に第1の層間絶縁膜を形成する工程と、
前記パワー・トランジスタの直上に前記第1の層間絶縁膜を介して第1の金属層を堆積した後に、該第1の金属層をパターニングすることにより、前記パワー・トランジスタの第1の電極として機能する少なくとも1つ以上の第1の金属パターン及び前記パワー・トランジスタの第2の電極として機能する少なくとも1つ以上の第2の金属パターンを形成する工程と、
前記第1の層間絶縁膜の上に、前記少なくとも1つ以上の第1の金属パターン及び前記少なくとも1つ以上の第2の金属パターンを覆うように第2の層間絶縁膜を形成する工程と、
前記第1の金属層の直上に前記第2の層間絶縁膜を介して第2の金属層を堆積した後に、該第2の金属層をパターニングすることにより、前記少なくとも1つ以上の第1の金属パターンのうち対応する第1の金属パターンと電気的に接続する少なくとも1つ以上の第1のバス及び前記少なくとも1つ以上の第2の金属パターンと電気的に接続する単一の第2のバスを形成する工程と、
前記第2の層間絶縁膜の上に、前記少なくとも1つ以上の第1のバス及び前記単一の第2のバスを覆うように第3の層間絶縁膜を形成する工程と、
前記第3の層間絶縁膜に、前記少なくとも1つ以上の第1のバスの各々と前記単一の第2のバスとを露出し、且つ、前記少なくとも1つ以上の第1のバスの各々と前記単一の第2のバスとに1つづつ設けられるように、少なくとも1つ以上の開口部を形成する工程と、
前記少なくとも1つ以上の開口部の各々に露出する前記少なくとも1つ以上の第1のバスの各々と前記単一の第2のバスとにコンタクト・パッドを設ける工程と、
前記コンタクト・パッドに少なくとも1つの接続部材を取り付ける工程とを備えることを特徴とする半導体集積回路の製造方法。 - 請求項11に記載の半導体デバイスの製造方法において、
前記少なくとも1つ以上の開口部を形成する工程は、前記第3の層間絶縁膜に、前記単一の第2のバスに複数個設けられるように行うことを特徴とする半導体集積回路の製造方法。
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JP2008218442A (ja) * | 2007-02-28 | 2008-09-18 | Matsushita Electric Ind Co Ltd | 半導体集積回路装置及びその製造方法 |
TWI469251B (zh) * | 2012-08-22 | 2015-01-11 | Realtek Semiconductor Corp | 一種電子裝置 |
KR102076305B1 (ko) * | 2013-05-13 | 2020-04-02 | 에스케이하이닉스 주식회사 | 반도체 소자 및 그 형성 방법 |
DE112017007430T5 (de) * | 2017-04-12 | 2020-01-16 | Mitsubishi Electric Corporation | Halbleitermodul, Verfahren zur Herstellung eines Halbleitermoduls und Leistungswandlergerät |
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CN111725206B (zh) * | 2019-07-29 | 2023-11-21 | 中国科学院上海微系统与信息技术研究所 | Pmos触发的scr器件、scr器件的制造方法及scr静电保护电路 |
CN111291525B (zh) * | 2020-02-17 | 2022-04-08 | 福州大学 | 考虑总线和非总线线网的层分配方法 |
EP3975226A1 (en) * | 2020-09-28 | 2022-03-30 | Infineon Technologies Austria AG | A semiconductor device module comprising vertical metallic contacts and a method for fabricating the same |
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