Power management system with digital low drop out regulator and DC/DC converter
First Claim
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1. A digital low dropout regulator comprising:
- a switch;
a resistive element;
a capacitive element coupled to the resistive element at a node; and
a switch controller configured tocouple to the node to receive an output voltage, wherein a first circuit receives power based on the output voltage during an active mode of the first circuit, and wherein the first circuit receives power based on the output voltage during a standby mode of the first circuit,compare the output voltage to a reference voltage, andcontrol the switch based on a comparison of the output voltage and the reference voltage,wherein the switch is configured to selectively provide a supply voltage to the node via the resistive element, andwherein the switch controller is configured to (i) receive a control signal, (ii) prevent the output voltage from decreasing to a voltage less than a minimum voltage based on the control signal including transitioning the switch to an ON state to turn ON the digital low dropout regulator for a predetermined period during the standby mode, and (iii) transition the switch to an OFF state subsequent to the predetermined period and during the standby mode.
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Abstract
A digital low dropout regulator is disclosed. The digital low dropout regulator includes a switch, a resistive element, a capacitive element coupled to the resistive element at a node, and a switch controller. The switch controller is configured to: couple to the node to receive an output voltage, compare the output voltage to a reference voltage, and control the switch based on a comparison of the output voltage and the reference voltage. The switch is configured to selectively provide a supply voltage to the node via the resistive element.
25 Citations
17 Claims
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1. A digital low dropout regulator comprising:
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a switch; a resistive element; a capacitive element coupled to the resistive element at a node; and a switch controller configured to couple to the node to receive an output voltage, wherein a first circuit receives power based on the output voltage during an active mode of the first circuit, and wherein the first circuit receives power based on the output voltage during a standby mode of the first circuit, compare the output voltage to a reference voltage, and control the switch based on a comparison of the output voltage and the reference voltage, wherein the switch is configured to selectively provide a supply voltage to the node via the resistive element, and wherein the switch controller is configured to (i) receive a control signal, (ii) prevent the output voltage from decreasing to a voltage less than a minimum voltage based on the control signal including transitioning the switch to an ON state to turn ON the digital low dropout regulator for a predetermined period during the standby mode, and (iii) transition the switch to an OFF state subsequent to the predetermined period and during the standby mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification