Switching regulator and operation control method
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United States of America Patent
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Dec 3, 2013
Grant Date -
Dec 24, 2009
app pub date -
Jun 16, 2009
filing date -
Jun 24, 2008
priority date (Note) -
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Abstract
In a switching regulator, a low voltage malfunction prevention circuit controls operations of a PWM comparator and a output buffer circuit, such that when a power source voltage is lower than a predetermined value, a switching transistor is forcibly turned off, and when the power source voltage is greater than or equal to the predetermined value, the switching transistor is turned on/off in accordance with pulse signals from the PWM comparator. Furthermore, the low voltage malfunction prevention circuit generates a second reference voltage that is lower than a first reference voltage and that rises quickly in accordance with the rise of the power source voltage. The state of the power source voltage inside an IC is detected by comparing the first reference voltage with the second reference voltage.
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