Mediatek Corporation

Mediatek Singapore Pte. Ltd.

Tun-Shih Chen

Yan-Bin Luo

Yen-Hsun Hsu

Chien-Wei Kuan

Min-Chung Chou

Soon Hwei Tan

Fan Yang

The present invention provides a DC-DC converter, wherein the DC-DC converter includes a controller, a first switch, a second switch, an inductor and a ripple signal generator. The controller is configured to generate an up signal and a down signal according to an output signal and a ripple signal. The first switch is coupled between an input voltage and a first node, and is controlled by the up signal. The second switch is coupled between the first node and a reference voltage, and is controlled by the down signal. The inductor is coupled between the first node and an output node, and is configured to receive a first signal from the first node to generate the output signal at the output node. The ripple signal generator is configured to generate the ripple signal, and reset the ripple signal every cycle to a specific voltage.

DC-DC converter having higher stability and output accuracy

A voltage supply circuit is provided. The voltage supply circuit is capable of operating at a first mode and generates a loading current at an output node. The voltage supply circuit includes a plurality of inductors and a plurality of drier circuits. The plurality of inductors are coupled to the output node. Each inductor has an inductance value. The plurality driver circuits are coupled to the plurality of inductors respectively. The inductance value of a first inductor among the plurality of inductors is greater than the inductance values of the other inductor.

Voltage supply circuits and controlling methods therefor

A DC-DC voltage converter and associated control method capable of dynamically adjusting upper boundary of the inductor current are provided. The DC-DC voltage converter is electrically connected to an input terminal having an input voltage and an output terminal having an output voltage. The DC-DC voltage converter converts the input voltage to the output voltage, and the DC-DC voltage converter operates in a pulse frequency modulation mode. The DC-DC voltage converter includes an inductor and a converting circuit, which are electrically connected to each other. An inductor current flows through the inductor. The converting circuit adjusts the inductor current according to a setting signal so that the inductor current is less than or equivalent to an upper boundary of the inductor current.

DC-DC voltage converter and associated control method capable of dynamically adjusting upper boundary of inductor current

A voltage converter is provided. The voltage converter includes a compensation circuit, a first comparator circuit, a first inductor, a first driver circuit, and a phase-lag circuit. The compensation circuit generates a first compensation signal according to a loading state of the voltage converter. The first comparator circuit compares the first compensation signal and a first reference signal to generate a first comparison signal. The first driver circuit generates a first driving voltage to the first inductor according to the first comparison signal. The phase-lag circuit is coupled between the first comparison circuit and the first driver. The phase-lag circuit modifies a duty of the first comparison signal for changing a first inductor current following the first inductor.

Voltage converter

A multifunctional output driver capable of transmitting signals of different interfaces in different modes is provided, in which first and second current sources are provided, and first to fourth switching devices are coupled between the first and second current sources, and the first and second current source and the first to the fourth switching devices act as a current steering circuit. In a first transmission mode, the first and second switching devices are turned off, and the third and fourth switching devices and the first current source act as a current mode logic circuit to provide an output signal compatible with a first transmission interface according to an input signal from a pre-driver. In a second transmission mode, the current steering circuit outputs an output signal compatible with a second transmission interface according to the input signal from the pre-driver.

Multifunctional output drivers and multifunctional transmitters using the same

Low dropout regulators capable of preventing damage caused by a short circuit or a heavy load are provided, in which a pass transistor receives an unregulated power supply voltage to generate a regulated output voltage according to a control signal. Additionally, a constant overcurrent limiting circuit limits an output current through the pass transistor to below a predetermined current, and a foldback overcurrent limiting circuit enables the constant overcurrent limiting circuit to further decrease the output current, when the regulated output voltage is lower than a predetermined voltage.

Growing community of inventors

Pingtung County, Taiwan

Tun-Shih Chen