| 摘要 |
PROBLEM TO BE SOLVED: To provide a charge-pump circuit that can achieve a desired step-up operation, even if a high-side switch for pre-charging or a low-side switch for output driving is structured with a low breakdown voltage transistor. SOLUTION: In response to a clock signal CLK, the high level of a drive input signal V<SB>DHS</SB>, that drives the high-side switch Q11 for pre-charging and the low-side switch Q14 for output driving, is set to a step-up output voltage Vout. The low level of the drive input signal V<SB>DHS</SB>is set not to the level of ground potential Vss (GND), but to an input voltage Vdd. COPYRIGHT: (C)2007,JPO&INPIT
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