Power-on reset circuit and under-voltage lockout circuit comprising the same
AssigneeFairchild Korea Semiconductor Ltd.
InventorsKinam SONG, Wonhi OH, Jinkyu CHOI, Bumseung JIN, Samuell SHIN
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Abstract
An UVLO circuit according to an aspect of the present invention includes: a power-on reset (POR) circuit generating an output based on a first current that flows according to an increase of a power supply voltage and not operating in a normal state of the power supply voltage; and a logic operation unit generating a reset signal according to an output of the POR circuit and an output based on a result of comparison between a sense voltage that corresponds to the power supply voltage and a predetermined reference voltage.
Claims20
A power-on reset (POR) circuit comprising:
- a capacitor in which a first current flows according to an increase of a power supply voltage;
- a current mirror configured to mirror the first current to a second current;
- and
- a transistor configured to be operated by the second current,
- wherein the power supply voltage reaches a normal reference voltage, and the POR circuit blocks mirroring of the current mirror and turns off the transistor.
An under-voltage lockout (UVLO) circuit comprising:
- a power-on reset (POR) circuit configured to generate an output based on a first current that flows according to an increase of a power supply voltage and not to operate in a normal state of the power supply voltage;
- and
- a logic operation unit configured to generate a reset signal according to an output of the POR circuit and an output based on a result of comparison between a sense voltage corresponding to the power supply voltage and a predetermined reference voltage.
Dependencies are inferred from the claim text.