Patent ID: 9647538
Date: 2017-05-09
CPC Classifications: G11C,H02M

Claim:
1. A voltage regulator comprising: a pump configured to generate a pump-out voltage in response to a pump clock; and pump circuits configured such that the pump clock has a first frequency or a second frequency lower than the first frequency depending on the pump-out voltage, wherein the pump circuits comprise: a capacitor configured to stably output the pump-out voltage; a voltage divider configured to divide the pump-out voltage and output a divided voltage; a first comparator configured to compare the divided voltage with a first reference voltage and output a first enable signal; a second comparator configured to compare the divided voltage with a second reference voltage and output a second enable signal; a clock frequency driver configured to output a clock having the first frequency or the second frequency in response to the first enable signal or the second enable signal; and a clock driver configured to output the pump clock having the first frequency or the second frequency in response to the clock.