DC-DC converter
AssigneeMediatek Inc.
InventorsShiue Shin Liu, Tse-Hsiang Hsu
Life of this patent
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Abstract
A DC-DC converter providing a DC output voltage at an output node. The DC-DC converter comprises an output stage, a digital controller, and a controller. The output stage comprises a pull-up circuit having a control terminal and coupled between a first fixed voltage and a internal node, a pull-down circuit coupled between the internal node and a second fixed voltage, and a low pass filter coupled between the internal node and the output node. The digital controller is powered by the DC output voltage and adjusts the DC output voltage by controlling the output stage. The controller controls a connection of a feedback path, comprising the digital controller, between the output node and the control terminal according to the DC output voltage.
Claims9
A DC-DC converter for providing an output voltage at an output node, the DC-DC converter comprising:
- an output stage, comprising:
- a pull-up circuit having a control terminal and coupled between a first fixed voltage and an internal node;
- a pull-down circuit coupled between the internal node and a second fixed voltage;
- and
- a low pass filter coupled between the internal node and the output node;
- a current control circuit, selectively coupled to the pull-up circuit, the current control circuit controlling a current flowing through the pull-up circuit;
- and
- a controller selectively connecting the current control circuit to the pull-up circuit according to the output voltage.
A DC-DC converter for converting an input voltage into an output voltage, the DC-DC converter comprising:
- a pull up and pull down circuit;
- a low pass filter coupled to the pull up and pull down circuit;
- a digital circuit coupled between an output of the low pass filter and an control terminal of the pull up and pull down circuit, the digital circuit being a feedback path of the DC-DC converter;
- and
- a current control circuit for controlling an current flowing through the pull up and pull down circuit during an initially powered-on period of the DC-DC converter.
Dependencies are inferred from the claim text.