Digital regulator
First Claim
1. A digital regulator, comprising:
- a comparator, coupled to a first external voltage, wherein the comparator is configured to compare a reference voltage with an internal voltage, so as to generate a first control voltage;
a hysteresis comparator, coupled to the first external voltage, wherein the hysteresis comparator is configured to compare the reference voltage with the internal voltage, so as to generate a second control voltage;
a first level shifter, coupled to a relatively high internal voltage, wherein the first level shifter generates a pre-control voltage according to the first control voltage;
a pre-driver, coupled to the relatively high internal voltage, wherein the pre-driver generates a gate control voltage at a control node according to the pre-control voltage;
a first control circuit, generating a third control voltage according to the first control voltage and the second control voltage;
a second control circuit, generating a fourth control voltage according to the first control voltage and the second control voltage;
a first transistor, wherein the first transistor has a control terminal for receiving the third control voltage, a first terminal coupled to the relatively high internal voltage, and a second terminal coupled to the control node;
a second transistor, wherein the second transistor has a control terminal for receiving the fourth control voltage, a first terminal coupled to the internal voltage, and a second terminal coupled to the control node; and
a third transistor, wherein the third transistor has a control terminal coupled to the control node, a first terminal coupled to the internal voltage, and a second terminal coupled to a second external voltage.
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Accused Products
Abstract
A digital regulator at least includes a comparator, a hysteresis comparator, a first control circuit, a second control circuit, a first transistor, and a second transistor. The comparator compares a reference voltage with an internal voltage, so as to generate a first control voltage. The hysteresis comparator compares the reference voltage with the internal voltage, so as to generate a second control voltage. The first transistor is coupled between a relatively high internal voltage and a control node. The first transistor is controlled by the first control circuit according to the first control voltage and the second control voltage. The second transistor is coupled between the control node and the internal voltage. The second transistor is controlled by the second control circuit according to the first control voltage and the second control voltage.
10 Citations
15 Claims
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1. A digital regulator, comprising:
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a comparator, coupled to a first external voltage, wherein the comparator is configured to compare a reference voltage with an internal voltage, so as to generate a first control voltage; a hysteresis comparator, coupled to the first external voltage, wherein the hysteresis comparator is configured to compare the reference voltage with the internal voltage, so as to generate a second control voltage; a first level shifter, coupled to a relatively high internal voltage, wherein the first level shifter generates a pre-control voltage according to the first control voltage; a pre-driver, coupled to the relatively high internal voltage, wherein the pre-driver generates a gate control voltage at a control node according to the pre-control voltage; a first control circuit, generating a third control voltage according to the first control voltage and the second control voltage; a second control circuit, generating a fourth control voltage according to the first control voltage and the second control voltage; a first transistor, wherein the first transistor has a control terminal for receiving the third control voltage, a first terminal coupled to the relatively high internal voltage, and a second terminal coupled to the control node; a second transistor, wherein the second transistor has a control terminal for receiving the fourth control voltage, a first terminal coupled to the internal voltage, and a second terminal coupled to the control node; and a third transistor, wherein the third transistor has a control terminal coupled to the control node, a first terminal coupled to the internal voltage, and a second terminal coupled to a second external voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification