Patent ID: 7075357

Claim:
A boosting circuit, comprising: a first charge pump circuit which contains a first capacitive section charged to a first voltage; a second charge pump circuit which contains a second capacitive section charged to said first voltage; a third charge pump circuit which contains a third capacitive section charged to said first voltage; and a switching unit which connects said first charge pump circuit, said second charge pump circuit and a first node in series in response to a first switch signal and a control signal such that a second voltage higher than said first voltage is outputted from said first node to a first internal circuit of a semiconductor device, and connects said first charge pump circuit, said second charge pump circuit, said third charge pump circuit and a second node in series in response to a second switch signal and said control signal, such that a third voltage is outputted from said second node to a second internal circuit of said semiconductor device, wherein said switching unit comprises: a first switching section which connects said first charge pump circuit and said second charge pump circuit in response to said control signal; a second switching section which connects said second charge pump circuit and said first node in response to said control signal and said first switch signal; a third switching section which connects said second charge pump circuit and said third charge pump circuit in response to said control signal and said second switch signal; and a fourth switching section which connects said third charge pump circuit and said second node.