Abstract: A method for fabricating a LDMOS device in a well region of a semiconductor substrate, including: forming a body region and a source layer in the well region through a window of a polysilicon layer above the well region, wherein the body region has a deeper junction depth than the source layer; forming spacers at side walls of the polysilicon layer; and etching through the source layer through a window shaped by the spacers, wherein the source layer under the spacers is protected from etching, and is defined as source regions of the LDMOS device.

Abstract: A multi-time programmable memory cell has a differential multi-time programmable memory cell and a second-level latch cell. The differential multi-time programmable memory cell provides a first balance signal and a second balance signal, and the second-level latch cell receives the first balance signal and the second balance signal and provides an output signal according to the first balance signal and the second balance signal based on a first latch control signal and a second latch control signal.

Abstract: An ESD protection circuit used to protect a protected circuit coupled between a first node and a second node against an ESD event. The ESD protection circuit has a discharging circuit and a control circuit. The discharging circuit selectively provides a current path for discharging a current from the first node to the second node. The control circuit controls the discharging circuit to switch on the current path during an ESD event. The control circuit further controls the discharging circuit to switch off the current path during the normal operation of the protected circuit.

Abstract: A control method of a switching converter, wherein the switching converter has a main transistor and is configured to provide an output signal. The control method includes: generating a feedback signal indicative of the output signal of the switching converter; generating a clock signal to determine the switching frequency of the main transistor; generating a control signal to control the main transistor based on the clock signal and the feedback signal; and detecting whether the on-time of the main transistor is smaller than a time threshold based on the control signal. If the on-time of the main transistor is smaller than the time threshold, the frequency of the clock signal will be adjusted to regulate the on-time of the main transistor to be equal to the time threshold.

Abstract: A current sense circuit for sensing a target current flowing through a sensing resistor, has a first operational amplifier, a first transistor and a common mode adjust circuit. The first operational amplifier has a first input terminal coupled to a positive terminal of the sensing resistor, a second input terminal coupled to a negative terminal of the sensing resistor, and an output terminal. The first transistor has a first terminal coupled to the first input terminal of the first operational amplifier, a second terminal configured to provide a first output voltage in responsive to the target current, and a control terminal coupled to the output terminal of the first operational amplifier. The common mode adjust circuit adaptively adjusts a common mode voltage of the first operational amplifier.

Abstract: A control method used in a four-switch buck-boost converter includes: filtering the voltage at the first switching node and generating a first ramp signal; filtering the first ramp signal and generating a first average signal; filtering the voltage at the second switching node and generating a second ramp signal; filtering the second ramp signal and generating a second average signal; generating a set signal based on the first ramp signal, the first average signal, the second ramp signal, the second average signal, a reference signal, and a feedback signal indicative of the output voltage, so as to turn on the first and third transistors, and turn off the second and fourth transistors; turning off the first transistor and turning on the second transistor when the on-time of the first transistor reaches a first time threshold; and turning off the third transistor and turning on the fourth transistor when the on-time of the third transistor reaches a second time threshold.

Abstract: A power bank having an input terminal; an output terminal; a battery; a bidirectional switch circuit coupled between the battery and the output terminal of the power bank; and a select circuit coupled between the input terminal and the output terminal of the power bank; wherein when the input terminal is wired up with a power source, and the load is powered by the power source, and meanwhile, the battery is charged by the power source via the select circuit and the bidirectional switch circuit; when the input terminal is disconnected from the power source, the load is powered by the battery via the bidirectional switch circuit.

Abstract: A control method used in a four-switch buck-boost converter includes: sensing the output voltage and generating a feedback signal; generating a compensation signal based on a reference signal and the feedback signal; sensing the current flowing through the inductor and generating a current sensing signal; comparing the current sensing signal with the compensation signal; turning on the first and third transistors and turning off the second and fourth transistors when the current sensing signal reduces to be lower than the compensation signal; turning off the first transistor and turning on the second transistor when the on-time of the first transistor in one switching period reaches a first time threshold; and turning off the third transistor and turning on the fourth transistor when the on-time of the third transistor reaches a second time threshold.

Abstract: A monolithic integrated circuit (IC) switch device includes an input pin that receives an input power supply and an output pin that is connected to a load. The monolithic IC switch device includes driving circuitry that controls a switching operation of a power switch to connect and disconnect the input power supply to and from the load. A microcontroller can enable or disable the monolithic IC switch device based on indicator signals received by the microcontroller from the monolithic IC switch device.

Abstract: A reference signal generator used with a switching mode power supply which converts an input voltage to an output voltage. The reference signal generator provides a reference signal consisting of a constant voltage signal and a variable voltage signal which is varying according to a duty cycle of the switching mode power supply during a startup period of the switching mode power supply and is varying according to a ratio of the input voltage at an end of the startup period to the input voltage of real time after the startup period.

Abstract: An electronic device with substrate current management. The electronic device has a semiconductor substrate in which a Schottky diode is formed. A parasitic PN diode is also formed in the semiconductor substrate, and coexisted with the Schottky diode in parallel. The forward voltage of the Schottky diode is limited to be larger than the forward conduction threshold voltage of the Schottky diode and to be smaller than the forward conduction threshold voltage of the parasitic PN diode.

Abstract: A power converter including a load transient response control module and associated method for controller the power converter. The load transient response control module detects a deviation of an output voltage of the power converter from a desired value of the output voltage and compares the deviation with a first threshold to provide a load response control signal indicating whether load transient change occurs. If the deviation is lower than the first threshold, a clock signal of the power converter is reset and a main switch of the power converter is maintained on during the period when the deviation is lower than the first threshold.

Abstract: A power supply includes a half-bridge circuit. The power supply further includes an output inductor connected to a switch node that is common to a high side switch and a low side switch of the half-bridge. During a turn ON time of the low side switch, a current detection circuit of the power supply samples and holds in a capacitor a valley of an inductor current flowing through the output inductor. Also during the turn ON time of the low side switch, the current detection circuit samples and holds in another capacitor a peak of the inductor current. During a turn OFF time of the low side switch, a sense inductor current that is representative of the inductor current is generated by combining the charges stored in the capacitors.

Abstract: An integrated circuit (IC) chip includes a copper structure with an intermetallic coating on the surface. The IC chip includes a substrate with an integrated circuit. A metal pad electrically connects to the integrated circuit. The copper structure electrically connects to the metal pad. A solder bump is disposed on the copper structure. The surface of the copper structure has a coating of intermetallic. The copper structure can be a redistribution layer and a copper pillar that is disposed on the redistribution layer.

Abstract: In one embodiment, a current sensing circuit includes a differential current sensing amplifier adapted for sensing a voltage drop across a main transistor, the differential current sensing amplifier being adapted for providing a switched current output to a timing circuit which is adapted for providing a timing signal to one or more switching current sample-and-hold circuits based on a current waveform of the switched current output, and the one or more switching current sample-and-hold circuits, each of which are adapted for producing a substantially continuous output current. In another embodiment, a method for detecting a current includes driving a main transistor with a first current, driving one or more sensing transistors with a second current, measuring a sensing inductor current of the one or more sensing transistors, and determining the first current based on the sensing inductor current, wherein the sensing inductor current is related to the first current.

Abstract: A control circuit used for controlling a resonant converter. The control circuit has a setting capacitor, N up thresholds and N low thresholds. If the resonant converter operates in the inductive mode, a setting voltage signal across the setting capacitor is respectively compared with the largest one of the N up thresholds and the smallest one of the N low thresholds in each operation cycle to generate a high-side control signal and a low-side control signal for controlling a high-side switch and a low-side switch of the resonant converter. If the resonant converter enters into the capacitive mode, the setting voltage signal is respectively compared with each of the N up thresholds and each of the N low thresholds operation cycle by operation cycle to generate the high-side control signal and the low-side control signal.

Abstract: A digital PFC circuit with improved power factor is described. The digital PFC circuit uses a compensation current generating unit and a reference current adjust unit to eliminate the effect of a current flowing through an input capacitor to the input current, so that the input current and the input line voltage of the digital PFC circuit are controlled to be in-phase.

Abstract: A power supply includes a half-bridge circuit. The power supply further includes an output inductor connected to a switch node that is common to a high side switch and a low side switch of the half-bridge. During a turn ON time of the low side switch, a current detection circuit of the power supply samples and holds in a capacitor a valley of an inductor current flowing through the output inductor. Also during the turn ON time of the low side switch, the current detection circuit samples and holds in another capacitor a peak of the inductor current. During a turn OFF time of the low side switch, a sense inductor current that is representative of the inductor current is generated by combining the charges stored in the capacitors.

Abstract: A primary side regulated isolation voltage converter. The primary side regulated isolation voltage converter comprises a control module and a ripple control circuit. The control module receives the voltage feedback signal and determines whether the isolation voltage converter operates in a light load state. When the isolation voltage converter operates in a light load state, the ripple control circuit senses the ripple of an output voltage signal to generate a ripple signal, and compare the ripple signal with a ripple threshold. When the ripple signal is larger than the ripple threshold, the isolation voltage converter jumps out the light load state.

Abstract: A control method of frequency jittering with a switching mode power supply, comprising: turning on and off a power switch of the switching mode power supply alternatively; updating a peak current signal of the switching mode power supply at a beginning of an on time of the power switch according to a length of a switching period before the beginning of the on time of the power switch, wherein the peak current signal varies as the length of the switching period changes.