Excelliance Mos Corporation

Pei-Ting Yang

Ching-Tsan Lee

Ming-Hung Chien

Ke-Wei Wu

A voltage converting circuit and a control circuit thereof are provided. The control circuit includes a comparator, a clock generator, and a boost circuit. The comparator compares an input voltage with an output voltage to generate a comparison signal. The clock generator generates a clock signal according to the comparison signal to enable the clock signal to have a first frequency in a first time interval and to have a second frequency in a second time interval. The first frequency is higher than the second frequency. The first time interval occurs before the second time interval. The boost circuit receives the clock signal, pulls up a control signal of a driving switch in the first time interval according to a first driving capability, and generates the control signal in the second time interval according to a second driving capability. The first driving capability is greater than the second driving capability.

Voltage converting circuit and control circuit thereof

A control circuit of a load switch including a charge pump circuit, an oscillator, and a current signal generator is provided. The charge pump circuit generates a control signal according to a clock signal. The load switch is turned on or turned off according to the control signal. The oscillator generates the clock signal according to a control current. The current signal generator provides a resistor string to receive a power voltage. The resistor string of the current signal generator generates a sensed current or a sensed voltage according to the power voltage. The current signal generator generates the control current according to a reciprocal of the sensed current or a square of the sensed voltage. A frequency of the clock signal is negatively related to the power voltage.

Control circuit for load switch

A power switch circuit including first and second transistors, and a control circuit is provided. A first end of the first transistor serves as an input terminal of the power switch circuit. A second end of the first transistor is coupled to a node. A control end of the first transistor receives a first control voltage. A first end of the second transistor serves as an output terminal of the power switch circuit. A second end of the second transistor is coupled to the node. A control end of the second transistor receives a second control voltage. The control circuit detects a voltage of the node to determine a type of series connection between the first and second transistors, and generates the first and second control voltages to control a turned-on state of another of the first and second transistors after turning on one of the first and second transistors.

Power switch circuit

A voltage conversion circuit and a control circuit thereof are provided. The control circuit includes a voltage selection circuit, a buffer circuit, and a pull-down switch. The voltage selection circuit receives an input voltage and an output voltage, and selects a smaller voltage value as a selected voltage from the input voltage and the output voltage. The buffer circuit receives the selected voltage, and provides the selected voltage as a reference voltage. A control end of the pull-down switch receives an enable signal, so that the pull-down switch is switched on or switched off based on the enable signal. The pull-down switch is switched on based on the enable signal, to pull down a voltage at a control end of a driver switch to the reference voltage and switch off the driver switch.

Growing community of inventors

Hsinchu County, Taiwan

Pei-Ting Yang