Patent ID: 6865116

Claim:
A boosting circuit, comprising: a bootstrap circuit for boosting a first voltage to output a second voltage; a reference voltage generator for generating a reference voltage; and a clamp circuit unit including at least one clamp circuit, said clamp circuit comparing the second voltage and the reference voltage and, depending on a result of the comparison, said clamp circuit being driven to drop the second voltage to a target voltage, said clamp circuit including. a voltage divider receiving the second voltage, for dividing the second voltage; a comparator receiving the reference voltage, for comparing the reference voltage and a divided voltage that is divided in the voltage divider, wherein when the divided voltage is higher than the reference voltage, the comparator outputs a first signal, and when the divided voltage is lower than the reference voltage, the comparator outputs a second signal having an opposite phase to the first signal; and a voltage drop unit for dropping the second voltage to the target voltage, wherein the voltage drop unit is driven by the first signal; and said voltage divider including, a level shifter circuit for inverting the second voltage according to an enable signal; a transistor driven by an output signal of the level shifter circuit, for transmitting the second voltage; and a dividing means for dividing the second voltage outputted from the transistor.