JP5970316B2 - 半導体装置の製造方法 - Google Patents
半導体装置の製造方法 Download PDFInfo
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- JP5970316B2 JP5970316B2 JP2012212494A JP2012212494A JP5970316B2 JP 5970316 B2 JP5970316 B2 JP 5970316B2 JP 2012212494 A JP2012212494 A JP 2012212494A JP 2012212494 A JP2012212494 A JP 2012212494A JP 5970316 B2 JP5970316 B2 JP 5970316B2
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- lead frame
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Description
<DC/DCコンバータの回路構成および動作>
図1は、降圧型DC/DCコンバータの回路構成を示す図である。図1に示すように、降圧型DC/DCコンバータでは、入力端子TE1とグランドGNDとの間にHigh−MOSトランジスタQHとLow−MOSトランジスタQLが直列接続されている。そして、High−MOSトランジスタQHとLow−MOSトランジスタQLとの間のノードNAとグランドGNDとの間にインダクタLと負荷RLが直列接続されており、負荷RLと並列にコンデンサCが接続されている。
次に、High−MOSトランジスタQHがオフしている場合を考える。この場合、Low−MOSトランジスタQLがオンしていることから、インダクタLにかかる電圧は、0−Vout=−Voutとなる。したがって、オフ期間TOFFにおける電流の増加分ΔIOFFは、式(2)で与えられる。
このとき、定常状態となると、インダクタLを流れる電流は、スイッチング動作の1周期の間に増減しないことになる。言い換えれば、1周期の間にインダクタLに流れる電流が増減する場合、まだ定常状態に達していないことを意味する。したがって、定常状態では、式(3)が成立する。
この式(3)に式(1)の関係および式(2)の関係を代入すると、以下に示す式(4)を得ることができる。
この式(4)において、TON≧0、および、TOFF≧0であることから、Vout<Vinであることがわかる。すなわち、図1に示す降圧型DC/DCコンバータは、入力電圧Vinよりも低い出力電圧Voutを出力する回路であることがわかる。そして、式(4)から制御回路CCによるスイッチング動作を制御することにより、オン期間TONとオフ期間TOFFを変化させることで、入力電圧Vinよりも低い任意の出力電圧Voutを得ることができることがわかる。特に、オン期間TONとオフ期間TOFFとが一定になるように制御すれば、一定の出力電圧Voutを得ることができる。
上述したDC/DCコンバータに含まれる制御回路CC、Low−MOSトランジスタQL、および、High−MOSトランジスタQHは、例えば、1パッケージ化した半導体装置として製品化される。この1パッケージ化した半導体装置は、図1に示すインダクタLやコンデンサCを含んでいないため、DC/DCコンバータの一部を構成する半導体装置であるが、便宜上、DC/DCコンバータを構成する半導体装置と呼ぶこともある。
本実施の形態1における半導体装置PK1のパッケージ形態は、QFNパッケージであるが、特に、上述した本実施の形態1における半導体装置PK1は、MAPモールド技術(MAP:Matrix Array Package、一括モールド技術)で製造されている形態に対応している。
QFNパッケージをMAPモールド技術で製造する場合、例えば、図7に示すように、予めリードフレームLFの裏面にテープTPを貼り付ける構成が有用である。このような構成を採用すると、図8に示すように、リードフレームLFの裏面にテープTPを貼り付けた状態で、チップ搭載部TAB上に半導体チップCHPを搭載することになる。
本実施の形態1における半導体装置は、例えば、図4に示すように、DC/DCコンバータの一部を構成する半導体装置PK1であり、QFNパッケージで実装構成されている。そこで、以下では、DC/DCコンバータの一部を構成するQFNパッケージからなる半導体装置PK1の製造方法を例に挙げて、本実施の形態1における技術的思想について説明する。
次に、本実施の形態1における特徴について、図面を参照しながら説明する。上述したように、本実施の形態1の特徴点は、リードフレームLF1の裏面にテープTPを貼り付ける際のリードフレームLF1の固定方法に存在する。特に、本実施の形態1における技術的思想は、半導体チップに与えるダメージを低減しながら、リードフレームの表面側を支持した状態で、リードフレームの裏面にテープを貼り付けるものである。以下に、本実施の形態1における技術的思想を具体的に説明する。
次に、本実施の形態1における変形例1について説明する。図29は、本変形例1において、リードフレームLF1の表面側を支持部材SUで支持した状態で、リードフレームLF1の裏面にテープTPを貼り付ける様子を示す断面図である。
続いて、本実施の形態1における変形例2について説明する。図30は、本変形例2において、リードフレームLF1の表面側を支持部材SUで支持した状態で、リードフレームLF1の裏面にテープTPを貼り付ける様子を示す断面図である。
次に、上述した実施の形態1、変形例1および変形例2で説明した緩衝材(Low−MOSクリップCLP(L)や緩衝材BUF)の具体的な構成および利点について説明する。
図31を参照しながら、実施の形態1の構成要素について考える。実施の形態1では、例えば、図28に示すように、Low−MOSチップCHP(L)上に、高融点半田HS2を介して、Low−MOSクリップCLP(L)が搭載されており、このLow−MOSクリップCLP(L)の上面が支持部材SUと接触している。
図31を参照しながら、変形例1の構成要素について考える。変形例1では、例えば、図29に示すように、ドライバICチップCHP(C)上に、緩衝材BUFが配置されており、この緩衝材BUF上に支持部材SUが配置された構成をしている。
図31を参照しながら、変形例2の構成要素について考える。変形例2では、例えば、図30に示すように、Low−MOSクリップCLP(L)の上面と、支持部材SUに設けられている溝部DITの底面BSとの間にも緩衝材BUFが介在するように構成されている。すなわち、本変形例2においては、Low−MOSチップCHP(L)と溝部DITの底面BSとの間にLow−MOSクリップCLP(L)および緩衝材BUFが介在する構成をしている。
本実施の形態2では、High−MOSクリップとLow−MOSクリップが形成された複数の単位領域が行列状(マトリクス状)に配置されたクリップフレームを使用して、半導体装置を製造する技術的思想について説明する。
本実施の形態2における半導体装置PK2の実装構成は、前記実施の形態1における半導体装置PK1の実装構成とほぼ同様である。
本実施の形態2における半導体装置PK2は上記のように構成されており、以下に、その製造方法について、図面を参照しながら説明する。
次に、本実施の形態2における特徴について、図面を参照しながら説明する。本実施の形態2の特徴点は、リードフレームLF1の裏面にテープTPを貼り付ける際のリードフレームLF1の固定方法に存在する。特に、本実施の形態2における技術的思想は、半導体チップに与えるダメージを低減しながら、リードフレームの表面側を支持した状態で、リードフレームの裏面にテープを貼り付けるものである。以下に、本実施の形態2における技術的思想を具体的に説明する。
次に、本実施の形態2における変形例1について説明する。図45は、本変形例1において、リードフレームLF1の表面側を支持部材SUで支持した状態で、リードフレームLF1の裏面にテープTPを貼り付ける様子を示す断面図である。
続いて、本実施の形態2における変形例2について説明する。図46は、本変形例2において、リードフレームLF1の表面側を支持部材SUで支持した状態で、リードフレームLF1の裏面にテープTPを貼り付ける様子を示す断面図である。
本実施の形態3でも、チップ搭載部TAB(H)とHigh−MOSチップCHP(H)との接続、および、チップ搭載部TAB(L)とLow−MOSチップCHP(L)との接続に高融点半田HS1を使用する。一方、本実施の形態3では、チップ搭載部TAB(C)とドライバICチップCHP(C)との接続に銀ペーストPSTを使用する例について説明する。
本実施の形態3における半導体装置の実装構成は、前記実施の形態2における半導体装置PK2の実装構成とほぼ同様であるため、相違点を中心に説明する。
本実施の形態3における半導体装置は上記のように構成されており、以下に、本実施の形態3における半導体装置の製造方法について、図面を参照しながら説明する。
次に、本実施の形態3における特徴について、図面を参照しながら説明する。本実施の形態3の特徴点は、リードフレームLF1の裏面にテープTPを貼り付ける際のリードフレームLF1の固定方法に存在する。特に、本実施の形態3における技術的思想は、リードフレームLF1の裏面にテープTPを貼り付けた後、チップ搭載部TAB(C)上にドライバICチップCHP(C)を搭載することにより、チップ搭載部TAB(C)上も支持部材SUで押さえ付けることができるようにしたものである。以下に、本実施の形態3における技術的思想を具体的に説明する。
続いて、本実施の形態3における変形例について説明する。図61は、本変形例において、リードフレームLF1の表面側を支持部材SUで支持した状態で、リードフレームLF1の裏面にテープTPを貼り付ける様子を示す断面図である。
前記実施の形態1〜3では、ドライバICチップCHP(C)と、High−MOSチップCHP(H)と、Low−MOSチップCHP(L)とを封止体で封止した半導体装置について説明したが、前記実施の形態1〜3における技術的思想は、例えば、High−MOSチップCHP(H)とLow−MOSチップCHP(L)を封止体で封止した半導体装置にも適用することができる。
本変形例1も実施の形態4と同様に、High−MOSチップCHP(H)とLow−MOSチップCHP(L)を封止体で封止した半導体装置を対象にしているが、特に、本変形例1では、High−MOSチップCHP(H)上にHigh−MOSクリップCLP(H)を搭載しない例について説明する。
本変形例2では、例えば、パワーMOSFET(スイッチング用電界効果トランジスタ)が形成されている単体の半導体チップを封止体で封止した半導体装置について説明する。
BS 底面
BTE 裏面端子
BUF 緩衝材
C コンデンサ
CAV キャビティ
CC 制御回路
CHP 半導体チップ
CHP(C) ドライバICチップ
CHP(H) High−MOSチップ
CHP(L) Low−MOSチップ
CLF クリップフレーム
CLP クリップ集合体
CLP(H) High−MOSクリップ
CLP(L) Low−MOSクリップ
DIT 溝部
DIV 区画領域
DIV2 区画領域
DT ダイシングテープ
FU 枠部
GND グランド
GP(H) ゲート電極パッド
GP(L) ゲート電極パッド
HL 吊りリード
HS 高融点半田
HS1 高融点半田
HS2 高融点半田
L インダクタ
LD リード
LD1 リード
LD2 リード
LF リードフレーム
LF1 リードフレーム
LF2 リードフレーム
MR 樹脂
NA ノード
OP1 開口部
OP2 開口部
PD 電極パッド
PJN 突起部
PK1 半導体装置
PK2 半導体装置
PK3 半導体装置
PR 製品領域
PST 銀ペースト
QH High−MOSトランジスタ
QL Low−MOSトランジスタ
RL 負荷
SP(H) ソース電極パッド
SP(L) ソース電極パッド
ST シート
SU 支持部材
TAB チップ搭載部
TAB(C) チップ搭載部
TAB(H) チップ搭載部
TAB(L) チップ搭載部
TE1 入力端子
TP テープ
UR 単位領域
Vin 入力電圧
Vout 出力電圧
W ワイヤ
Claims (18)
- (a)第1チップ搭載部と第1リードとを備えた第1領域が行列状に複数配置された第1リードフレームを準備する工程と、
(b)前記第1チップ搭載部の上面上に第1導電性接着材を介して第1半導体チップを搭載する工程と、
(c)前記第1半導体チップの第1電極パッドと前記第1リードとに第2導電性接着材を介して第1金属板を搭載する工程と、
(d)前記第1導電性接着材および前記第2導電性接着材を第1温度で加熱する工程と、
(e)前記(d)工程後、前記第1リードフレームの前記第1半導体チップが搭載された面とは反対側の面にテープを貼り付ける工程と、
(f)前記(e)工程後、前記第1半導体チップを覆うように前記第1リードフレーム内の複数の前記第1領域を一括封止して封止体を形成する工程と、を有し、
前記(e)工程は、前記第1金属板を支持した状態で前記第1リードフレームに前記テープを貼り付け、
前記第1リードフレームの前記第1領域は、第2チップ搭載部を備え、
前記(b)工程は、前記第2チップ搭載部の上面上に前記第1導電性接着材を介して第2半導体チップを搭載する工程を含み、
前記(e)工程は、緩衝材を介して前記第2半導体チップを支持した状態で前記第1リードフレームに前記テープを貼り付ける半導体装置の製造方法。 - 請求項1に記載の半導体装置の製造方法において、
前記(e)工程の後、前記(f)工程の前に、前記第1半導体チップの第2電極パッドと前記第2半導体チップの電極パッドとを金属ワイヤにより電気的に接続する工程を有する半導体装置の製造方法。 - 請求項1に記載の半導体装置の製造方法において、
前記(e)工程は、前記緩衝材を介して前記第1金属板を支持する半導体装置の製造方法。 - 請求項1に記載の半導体装置の製造方法において、
前記緩衝材の縦弾性係数は、前記第2半導体チップの縦弾性係数よりも低い半導体装置の製造方法。 - 請求項1に記載の半導体装置の製造方法において、
前記(c)工程は、前記第1金属板が行列状に複数配置された第2リードフレームを前記第1リードフレームの前記第1半導体チップが搭載された面に重ねることにより行う半導体装置の製造方法。 - 請求項5に記載の半導体装置の製造方法において、
前記第2リードフレームの複数の前記第1金属板の第1方向および前記第1方向と直交する第2方向における配置ピッチと、前記第1リードフレームの前記第1チップ搭載部の前記第1方向および前記第2方向における配置ピッチは、同一である半導体装置の製造方法。 - 請求項1に記載の半導体装置の製造方法において、
(g)前記(f)工程の後、前記第1リードフレームから前記テープを剥離する工程と、
(h)前記(g)工程の後、前記第1リードフレーム内の複数の前記第1領域のそれぞれの間の領域をダイシングブレードにより切断して個片化する工程と、を有する半導体装置の製造方法。 - 請求項1に記載の半導体装置の製造方法において、
前記第1温度は、前記テープの耐熱温度よりも高い半導体装置の製造方法。 - 請求項8に記載の半導体装置の製造方法において、
前記第1導電性接着剤および前記第2導電性接着材は半田である半導体装置の製造方法。 - 請求項2に記載の半導体装置の製造方法であって、
前記第1半導体チップは、電界効果トランジスタを含み、
前記第1半導体チップは、前記第1電極パッドおよび前記第2電極パッドが配置された表面および前記表面とは反対側の裏面を有し、
前記第2半導体チップは、前記電界効果トランジスタを制御する制御回路を含み、
前記第1半導体チップの前記第1電極パッドは、ソース電極パッドであり、
前記第1半導体チップの前記第2電極パッドは、ゲート電極パッドであり、
前記第1半導体チップの前記裏面には、ドレイン電極が形成されている半導体装置の製造方法。 - 請求項1に記載の半導体装置の製造方法であって、
前記(e)工程は、前記第2半導体チップを支持しない状態で行なう半導体装置の製造方法。 - (a)第1チップ搭載部、第2チップ搭載部、および、第1リードを備えた第1領域が行列状に複数配置されたリードフレームを準備する工程と、
(b)前記第1チップ搭載部の上面上に第1導電性接着材を介して第1半導体チップを搭載する工程と、
(c)前記第1半導体チップの第1電極パッドと前記第1リードとに第2導電性接着材を介して第1金属板を搭載する工程と、
(d)前記第1導電性接着材および前記第2導電性接着材を第1温度で加熱する工程と、
(e)前記(d)工程の後、前記リードフレームを洗浄する工程と、
(f)前記(e)工程の後、前記リードフレームの前記第1半導体チップが搭載された面とは反対側の面にテープを貼り付ける工程と、
(g)前記(f)工程の後、前記第2チップ搭載部の上面上に第3導電性接着材を介して第2半導体チップを搭載する工程と、
(h)前記(g)工程の後、前記第3導電性接着材を第2温度で加熱する工程と、
(i)前記(h)工程の後、前記第1半導体チップおよび前記第2半導体チップを覆うように前記リードフレーム内の複数の前記第1領域を一括封止して封止体を形成する工程と、を有し、
前記第2温度は前記第1温度よりも低い半導体装置の製造方法。 - 請求項12に記載の半導体装置の製造方法において、
前記第1温度は、前記テープの耐熱温度よりも高く、
前記第2温度は、前記テープの耐熱温度よりも低い半導体装置の製造方法。 - 請求項13に記載の半導体装置の製造方法において、
前記第1導電性接着材および前記第2導電性接着材は半田であり、
前記第3導電性接着材は、銀ペーストである半導体装置の製造方法。 - 請求項12に記載の半導体装置の製造方法において、
前記(h)工程の後、前記(i)工程の前に、前記第1半導体チップの第2電極パッドと前記第2半導体チップの電極パッドとを金属ワイヤにより電気的に接続する工程を有する半導体装置の製造方法。 - 請求項15に記載の半導体装置の製造方法であって、
前記第1半導体チップは、電界効果トランジスタを含み、
前記第1半導体チップは、前記第1電極パッドおよび前記第2電極パッドが配置された表面および前記表面とは反対側の裏面を有し、
前記第2半導体チップは、前記電界効果トランジスタを制御する制御回路を含み、
前記第1半導体チップの前記第1電極パッドは、ソース電極パッドであり、
前記第1半導体チップの前記第2電極パッドは、ゲート電極パッドであり、
前記第1半導体チップの前記裏面には、ドレイン電極が形成されている半導体装置の製造方法。 - 請求項12に記載の半導体装置の製造方法において、
(j)前記(i)工程の後、前記リードフレームから前記テープを剥離する工程と、
(k)前記(j)工程の後、前記リードフレーム内の複数の前記第1領域のそれぞれの間の領域をダイシングブレードにより切断して個片化する工程と、を有する半導体装置の製造方法。 - 請求項12に記載の半導体装置の製造方法において、
前記(f)工程は、前記第2チップ搭載部を支持した状態で行なう半導体装置の製造方法。
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US20150214209A1 (en) | 2015-07-30 |
US20160233204A1 (en) | 2016-08-11 |
US9029197B2 (en) | 2015-05-12 |
US20140087520A1 (en) | 2014-03-27 |
US9343451B2 (en) | 2016-05-17 |
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