Abstract: An electronic device is provided, which includes an oscillator, a controller, and a test circuit. The oscillator generates a clock signal according to an enable signal. The oscillator determines a period of the clock signal according to an adjustment signal. The controller generates the enable signal and generates a first test signal according to the clock signal. The controller determines the period according to a first comparison signal and a second comparison signal. The test circuit, through the first test signal, tests the period to generate the first comparison signal and the second comparison signal.

Abstract: An inductor current emulator circuit is for use in a switching power regulator, wherein a first and a second switches of a power stage circuit switch an inductor. The first and second switches are ON during first and a second ON-times, respectively. The inductor current emulator circuit includes: a sensing circuit sensing an ON-current of the second switch to generate a current sensing signal; and an emulation control circuit configured to, when a duty ratio of the first switch is smaller than a first duty ratio threshold, generate a first part of a current emulation signal according to the current sensing signal during the second ON-time, and sample-and-hold the current sensing signal to generate a first sample-and-hold signal at an intermediate time point of the second ON-time, and generate a second part of the current emulation signal according to the first sample-and-hold signal at a following first ON-time.

Abstract: An electronic device is provided, which includes an oscillator, a controller, and a test circuit. The oscillator generates a clock signal according to an enable signal. The oscillator determines a period of the clock signal according to an adjustment signal. The controller generates the enable signal and generates a first test signal according to the clock signal. The controller determines the period according to a first comparison signal and a second comparison signal. The test circuit, through the first test signal, tests the period to generate the first comparison signal and the second comparison signal.

Abstract: A shutter circuit is provided for a multi-channel converter to blank the switching noise produced by the switching of the converter. The shutter circuit monitors the switching of the switches in the output stages of the converter, and when one channel performs switching, the shutter circuit will send a signal to other channels to block the current sensors thereof. The current sensors are so blocked for a period not to sense the switching noise. The mutual interference between the channels due to the switching noise of the converter is eliminated.

Abstract: A switching regulator may operate in a synchronous mode or an asynchronous mode. When the load current is higher than a threshold, the switching regulator switches a pair of serially connected high side and low side switches with a pulse width modulation signal. When the load current is lower than the threshold, the pulse width modulation signal is blocked not to switch the low side switch, the switching regulator switches only the high side switch with the pulse width modulation signal, the low side switch remains off, and a diode serially connected to the high side switch acts as a rectifier.

Abstract: A shutter circuit is provided for a multi-channel converter to blank the switching noise produced by the switching of the converter. The shutter circuit monitors the switching of the switches in the output stages of the converter, and when one channel performs switching, the shutter circuit will send a signal to other channels to block the current sensors thereof. The current sensors are so blocked for a period not to sense the switching noise. The mutual interference between the channels due to the switching noise of the converter is eliminated.