Abstract: This application relates to a circuit for generating an output voltage and regulating the output voltage to a target voltage. The circuit includes a switchable voltage divider circuit configured to generate a feedback voltage that is a variable fraction of the output voltage, an error amplifier stage configured to generate a control voltage on the basis of a reference voltage and the variable fraction of the output voltage, a buffer stage configured to generate the output voltage on the basis of the control voltage, and a charge injection circuit configured to inject charge at an intermediate node between the error amplifier stage and the buffer stage to thereby modify the control voltage generated by the error amplifier stage. The application further relates to a method of operating such circuit.

Abstract: A vehicle power distribution system includes a battery having a nominal voltage, a vehicle electrical load having a supply voltage different than the nominal voltage, and a monolithic solid state relay including integrated circuitry to convert the nominal voltage to the rated voltage and an output configured to selectively energize the vehicle electrical load with the rated voltage in response to a control signal from a vehicle controller applied to an input of the relay. The relay may include a PWM controller to provide a switching signal to a transistor connected to an output filter to step down the nominal voltage of the battery to the rated voltage of the vehicle electrical load. Relay output voltage and current monitoring circuitry may be connected to the PWM controller to provide over current and over voltage protection.

Abstract: A protocol can specifie a power-sourcing voltage range that indicates power sourcing capabilities. Additional power sourcing capabilities can be communicated using voltage variations within the power-sourcing voltage range. A power-sourcing device can provide power to an external power-sinking device over a wired connection containing a plurality of wires. A voltage control circuit can be configured to drive a voltage over a wire of the plurality of wires. Processing circuitry can communicate, using the voltage control circuit, first power-sourcing capabilities to the external power-sinking device by setting the voltage over the wire to a value within the power-sourcing voltage range. The processing circuitry can also communicate, using the voltage control circuit, the additional power sourcing capabilities of the power-sourcing device using voltage variations on the wire, the voltage variations maintaining voltage on the wire within the power-sourcing voltage range.

Abstract: The present invention relates to a chip power supply method and a chip, where configuration memory array provides configuration voltage to an NMOS transmission gate, and an LDO circuit supplies power to the chip. The method includes: determining that a working state of the chip switches from a first state to a second state, where the first state and the second state are separately an initial mode, a program mode or a user mode; and adjusting, according to the working state of the chip, a configuration bit to adjust an output voltage of the LDO circuit. The present invention reduces power dissipation of the chip during memory configuration, and improves working performance thereof during the user mode.

Abstract: In a particular implementation, an apparatus to stabilize a supply voltage includes a first current source, a second current source, and a control circuit. The first current source is responsive to a detection signal and has an output coupled to a voltage regulator circuit via an output node. The second current source is also coupled to the output node. The control circuit includes an input responsive to the detection signal and an output coupled to the second current source. The control circuit is configured to enable the second current source based on a delayed version of the detection signal.

Abstract: A power management system comprises an input power detector configured to generate a first enablement signal by detecting whether a first voltage is supplied; a first output stage connected to the input power detector and configured to receive and regulate the first voltage upon receiving the first enablement signal; an error operational amplifier is connected to the first output stage, a first input port of the error operational amplifier is configured to receive a first reference voltage, a second input port of the error operational amplifier is connected to a connection point of a first resistor and a second resistor, the first resistor is connected to the first output stage, the second resistor is connected to ground, and a system output port is located at the connection of the output port of the first output stage and the first resistor, to drive a load.

Abstract: A voltage-regulator device includes an error-amplifier stage configured to receive a first reference voltage and a feedback voltage, an output amplifier stage coupled to the error-amplifier stage and configured to generate an output voltage related to the first reference voltage by an amplification factor, and a feedback stage configured to generate the feedback voltage. A compensation stage is configured to implement a second feedback loop, and cause, in response to a variation of the output voltage, a corresponding variation of a first biasing voltage for the output amplifier stage. The compensation stage includes a coupling-capacitor element coupled between the output amplifier stage and a first internal node, and a driving module coupled between the first internal node, and the output amplifier stage and configured to generate a compensation voltage for driving the output amplifier stage.

Abstract: A method achieves minimum limit cycle oscillation (LCO) amplitude of a digital low dropout regulator (D-LDO) by adding auxiliary unit power transistors in parallel with the main PMOS array with selected unit strength and LCO mode. An improved D-LDO with reduced LCO amplitude includes an auxiliary power transistor array in selected strength driven by an output of a comparator in parallel with a main power transistor array.

Abstract: Systems, methods and apparatus for efficient control and biasing of pass devices that include at least one thin pass device and a remaining of thick pass devices. When operated at extreme high and low voltages, the at least one thin pass device maintains operation in its saturation region of operation while the remaining pass devices may be driven into their triode regions of operation. The thin and thick pass devices are arranged in a cascode configuration that includes a plurality of stacked devices. Biasing of the thin and thick cascode devices can be according to a voltage division scheme which protects the devices when the voltage across the stack is high, and provides a skewed voltage division across the stacked devices that promotes a higher gate-to-source voltage of the thick pass devices for a lower RON. In one exemplary case, gate length of the at least one thin pass device may be reduced to provide a lower gate-to-source voltage of the thin pass device during operation in the saturation region.

Abstract: Disclosed are methods, circuits, apparatuses and systems for providing power to a dynamic load such as a non-volatile memory array. According to embodiments, a voltage source may be adapted to generate and output a supply current at substantially a target voltage through a regulating transistor whose channel is in series between an output terminal of said charge pump and an input terminal of said NVM array. A discharge circuit branch coupled to an output terminal of the regulating transistor may be adapted to drain away current from the regulating transistor output terminal when a voltage at the regulating transistor output terminal exceeds a first defined threshold voltage. A bulk regulating circuit branch coupled to a bulk of the regulating transistor may be adapted to reduce a bulk-voltage of the regulating transistor when a voltage at the regulating transistor output terminal exceeds a defined threshold voltage.

Abstract: An integrated circuit embedded in a plug of a universal serial bus (USB) 3.1 type-C cable assembly is disclosed. The integrated circuit includes a first pin connected to an operation transmission line through which an operation voltage is transmitted, a second pin connected to a configuration channel (CC) line, a first resistor connected to the first pin, a ground line, and a switching circuit configured to connect the first resistor and the ground line using a channel voltage supplied to the second pin when the operation voltage is not applied, and disconnect the first resistor from the ground line based on the operation voltage.

Abstract: Tuning a bias voltage supplied to a series of one or more LEDs in a constant current LED pulsing drive circuit may comprise the steps of: (A) setting the bias voltage to a test value, the test value being at least equal to the sum of the bias voltage second component and the maximum forward voltage rating of each of the one or more LEDs; (B) measuring an intermediate voltage present between the series of one or more LEDs and the constant current source when the LEDs are turned on; (C) determining if the intermediate voltage exceeds the second component of the bias voltage; and (D) upon determining the intermediate voltage exceeds the second component of the bias voltage, reducing the bias voltage applied to the one or more LEDs by an amount necessary to cause the intermediate voltage to equal the second component of the bias voltage.

Abstract: A Power Over Data Lines (PoDL) system includes Power Sourcing Equipment (PSE) supplying DC power and differential Ethernet data over a single twisted wire pair to a Powered Device (PD). Due to start-up perturbations, PD load current variations, and other causes, dV/dt noise is introduced in the power signal. Such noise may be misinterpreted as data unless mitigated somehow. Rather than increasing the values of the passive filtering components conventionally used for decoupling/coupling the power and data from/to the wire pair, active circuitry is provided in the PSE, PD, or both to limit dV/dt in the power signal. Such circuitry may be implemented on the same chip as the PSE controller or PD controller. Therefore, the sizes of the passive components in the decoupling/coupling networks may be reduced.

Abstract: A voltage supply regulator includes a first output resistor including a first terminal coupled to an output voltage of the voltage supply regulator and a second terminal; a first comparator including a first input coupled to a reference voltage, a second input coupled to the second terminal of the first output resistor, and an output coupled to a base of a first regulator transistor; a current mirror coupled to a collector of the first regulator transistor; and an slew rate detector coupled to the current mirror that includes a first terminal coupled to control electrodes of first and second transistors in the current mirror, and a detection bipolar junction transistor having a collector coupled to the control electrodes of the first and second transistors in the current mirror, and a base coupled to a second terminal of the capacitor.

Abstract: A single electronic device can connect to and communicate with multiple independent load medias. The electronic device comprises a number of internal components, including a processor and a switch module. The processor is capable of switching between a first working mode and a second working mode. The first working mode can establish a one-to-one connection between one load media and one internal component upon a first control signal, and under the second working mode, the processor can generate a second control signal whereby independent connections are established between at least two load medias and at least two of the internal components.

Abstract: Apparatus and methods for programmable low dropout (LDO) regulators for radio frequency (RF) electronics are provided herein. In certain configurations, an LDO regulator for generating a programmable output voltage includes a regulation field-effect transistor (FET) having a drain electrically connected to the LDO regulator's output, an error amplifier that controls a gate of the regulation FET, a feedback circuit that provides a feedback signal to an inverting input of the error amplifier, an output capacitor electrically connected to the LDO regulator's output, and an alternative discharge circuit. When the output voltage of the LDO regulator is programmed from a high voltage level to a low voltage level, the alternative discharge circuit activates to discharge the output capacitor to improve the LDO regulator's transient response.

Abstract: A VBUS conductor is checked to determine whether a voltage on the VBUS conductor is greater than a vSafe0V voltage within a detect time interval. A device policy manager applies a vSafeDB voltage to the VBUS conductor when the voltage on the VBUS conductor is greater than the vSafe0V voltage. The policy engine waits for a bit stream to be detected within a timer interval. When the bit stream is not detected within the timer interval, the device policy manager is instructed to apply the vSafe0V voltage to the VBUS conductor. The device policy manager applies a vSafe5V voltage to the VBUS conductor when the bit stream is detected, and the policy engine waits for the bit stream to stop within a device ready timer interval. When the bit stream has stopped within the device ready timer interval, the policy engine sends capabilities as a source port.

Abstract: A voltage regulator, an active circuit, and a passive circuit is used. The active circuit is used to supply a reference signal as an input to the voltage regulator during a higher power mode. The passive circuit is used to supply a second reference signal as the input to the voltage regulator during a lower power mode, wherein the lower power mode consumes less power than the higher power mode.

Abstract: A noise cancellation system comprises an I-channel mixer configured to receive a radio frequency signal from an antenna and an intermediate frequency signal from a local oscillator, a Q-channel mixer configured to receive the radio frequency signal from the antenna and a phase-shifted intermediate frequency signal from the local oscillator, a first noise cancellation apparatus connected with the I-channel mixer, wherein an I-channel differential mode second-order intermodulation component and an I-channel common mode second-order intermodulation component cancel each other in the first noise cancellation apparatus and a second noise cancellation apparatus connected with the Q-channel mixer, wherein a Q-channel differential mode second-order intermodulation component and a Q-channel common mode second-order intermodulation component cancel each other in the second noise cancellation apparatus.

Abstract: A significant reduction of the amplitude of the transient response is obtained by keeping a low dropout regulator circuit in a closed loop condition. This is achieved by manipulation of the reference voltage level when an open loop condition arises due to a falling input voltage. In this case, the reference voltage level is tracked with the input voltage level, keeping the output voltage regulated. As a consequence, the power pass element of the regulator is not forced into the linear region (in the case of a MOSFET) or deep saturation (in the case of a bipolar transistor).

Abstract: A voltage regulation circuit is provided. The voltage regulation circuit regulates a level of a supply voltage provided by an automotive battery. The voltage regulation circuit includes a selector and an error amplifier. The selector receives a plurality of predetermined voltages and selects one of the plurality of predetermined voltages according to a control signal to serve as a first reference voltage. The error amplifier generates an error signal according to the first reference voltage and a feedback signal. The feedback signal is related to the supply voltage. The voltage regulation circuit regulates the level of the supply voltage according to the error signal.

Abstract: In some implementations, a system includes a voltage regulating circuit and a compensation circuit. The voltage regulating circuit includes a pass element configured to provide a regulated voltage to a load. The compensation circuit is configured to adjust a variable resistance based on a current of the load, the variable resistance being coupled to a gate terminal of the pass element through a capacitor.

Abstract: An example voltage regulator includes an output transistor that includes a source coupled to a first voltage supply node and a drain coupled to an output node. The voltage regulator further includes a first transistor that includes a source coupled to the output node, and a second transistor that includes a source coupled to a gate of the output transistor and a drain coupled to a second voltage supply node. The voltage regulator further includes a resistor coupled between the second voltage supply node and a first node that includes the drain of the first transistor and a gate of the second transistor. The voltage regulator further includes an error amplifier that includes a first input coupled to a reference voltage node, a second input coupled to the output node, and an output coupled to a gate of the first transistor.

Abstract: A regulator includes a driver circuit, an amplifier circuit, a first current source circuit and a second current source circuit. The driver circuit is configured to receive an input voltage and provide an output voltage. The first current source circuit is configured to provide a first current to the amplifier circuit. The second current source circuit is configured to provide a second current to the amplifier circuit according to the output voltage if the output voltage deviates from a predetermined voltage. The amplifier circuit is configured to control the driver circuit according to the output voltage and a third current, in which the third current is a sum of the first current and the second current.

Abstract: Methods, systems, and apparatuses are described for a low dropout voltage regulator that utilizes a replica feedback frequency compensation technique to provide enhanced stability to the low dropout voltage regulator such that the low dropout voltage regulator does not need to be externally compensated with a large capacitor (e.g., larger than 4 microfarads). Rather, a small capacitor (e.g., 4 microfarads or smaller) may be used.

Abstract: A control circuit for switching power converters with synchronous rectifiers is disclosed for providing start-up and shut-down protection. The control circuit for switching power converters with synchronous rectifiers includes a device for blocking the driving signals to the synchronous rectifiers, a voltage sampling circuit, a reference voltage, and a comparator. The comparator compares a sample voltage to a reference voltage to determine when to block and when to admit driving signals to the synchronous rectifiers. The control circuit for switching power converters with synchronous rectifiers is particularly useful for minimizing component damage due to start-up and shut-down transients.

Abstract: A variable gain circuit used in an in-band communication system is provided that includes a current sense pickup that is coupled to the output of a DC power source that senses current from the DC power source and provides a first output signal. A variable controlled amplifier structure, that is coupled to the DC power source, receives the first output signal and provides a specified amount of gain to the first output signal so as to produce a second output signal. A digital signal is produced using the second output having a selected frequency bandwidth.

Abstract: The techniques described herein reduce a rate at which a mobile device consumes energy when receiving, processing and storing data events (e.g., emails, instant messages, social networking messages and notifications, etc.). In various embodiments, the techniques may be implemented in accordance with a connected standby mode of operation for the mobile device. Therefore, the techniques may decouple data reception from data processing when exchanging data events in the connected standby mode. In various embodiments, the techniques may store persistent memory operations for multiple data events in a temporary cache and process the stored persistent memory operations as a batch (e.g., perform the persistent memory operations together). In various embodiments, the techniques may partition data storage space allocated for data communications applications on the mobile device.

Abstract: Apparatuses and methods for providing a program voltage responsive to a voltage determination are described. An example apparatus includes a memory array comprising a plurality of access lines. The example apparatus further includes a memory access circuit coupled to the memory array. The memory access circuit is configured to, during a memory program operation, provide an inhibit voltage to the plurality of access lines. The memory access circuit is further configured to, during the memory program operation, provide a program voltage to a target access line of the plurality of access lines responsive to a determination that an access line of the plurality of access lines has a voltage equal to or greater than a threshold voltage. The threshold voltage is less than the inhibit voltage.

Abstract: A method includes using a pass device of a linear regulator to provide an output signal to an output of the linear regulator in response to a signal that is received at a control terminal of the pass device. The method includes using the linear regulator to regulate the signal received at the control terminal based at least in part on the output signal; and controlling a closed loop frequency response of the linear regulator to cause a direct current (DC) gain of the linear regulator to extend to a frequency near or at frequency of a zero that is associated with a decoupling capacitor that is coupled to the output of the linear regulator.

Abstract: A boost converter circuit receives an input power supply voltage and produces an output boosted supply voltage. The circuit includes a voltage regulator, boosting circuitry, and a timing controller. The voltage regulator provides a regulated voltage to the boosting circuitry, which controls switching a transistor to drive the output boosted supply voltage; and the timing controller controls switching the boost circuit from the start-up mode to the normal operation mode. In start-up mode, the regulated voltage is generated from the input power supply voltage. During normal operation mode, the regulated voltage is generated from the output boosted supply voltage. The circuitry performs a low-power start-up when the input power supply voltage is low, and maintains efficient low-power operation by driving the transistor to produce the output boosted supply voltage as the input power supply voltage decreases.

Abstract: A method in a switched-mode power supply (SMPS) and SMPS circuits are provided. The method and circuits use bang-bang regulation to provide for an auxiliary power supply that can be used to power a controller of the SMPS. The additional circuitry required to achieve the method and circuits is minimal and represents advantages over techniques that require an additional power supply or require an auxiliary winding in a transformer. The bang-bang regulation controls switch devices within the SMPS such that a normally-on switch device is enabled while a normally-off switch device is disabled for some period of time. During this period, current is supplied to the SMPS controller and an associated energy-storage device.

Abstract: The present disclosure provides a detailed description of techniques for implementing a wideband low dropout voltage regulator with power supply rejection boost. More specifically, some embodiments of the present disclosure are directed to a voltage regulator comprising a voltage regulator core powered by a supply voltage and providing a regulated voltage output, and a power supply feed forward injection module delivering an injection signal to the voltage regulator core to effect a power supply rejection of the supply voltage variation from the regulated voltage. In one or more embodiments, the injection signal is determined from the supply voltage variation and a gain factor that is based on various design attributes of the output stage of the voltage regulator core. In one or more embodiments, the power supply feed forward injection module comprises a supply voltage sense circuit, a low pass filter, and one or more selectable transconductance amplifiers.

Abstract: Methods, devices, and integrated circuits are disclosed for a driver controller that internally calculates average output current. In one example, a method includes receiving an output voltage of an output line. The method further includes performing a calculation of an average output current at the output line based at least in part on the output voltage. The method further includes controlling an interval timing of a switch based at least in part on the calculation of the average output current at the output line, wherein the switch is configured for switching current to the output line.

Abstract: A circuit and method for providing a current limiting feature in a low dropout (“LDO”) linear voltage regulator. A pass element generates an output voltage that is less than the input voltage. The pass element is normally enabled by an error amplifier that compares a feedback signal from the output of the pass element with a reference signal. However, the pass element may be enabled by a current limiting circuit that bypasses the error amplifier to limit the current generated at the output of the pass element.

Abstract: The present invention pertains to a linear power regulator device, comprising an internal pass device, a driver device having a driver output arranged to drive the internal pass device via the driver output, wherein the linear power regulator device comprises an external connection connectable or connected to an external pass device; and wherein the driver device is arranged to drive an external pass device via the driver output and the external connection. The invention also pertains to a corresponding electronic device.

Abstract: A voltage regulator includes a feedback regulation loop and a drive transistor configured to source current to a regulated output. A transient recovery circuit is coupled to the voltage regulator circuit and includes a first transistor coupled to source current into a control terminal of the drive transistor, wherein the source current is in addition to current sourced in response to operation of the feedback regulation loop. The first transistor is selectively actuated in response to a drop in voltage at the regulated output. The transient recovery circuit further includes a second transistor coupled to sink current from the regulated output. The sink current has a first non-zero magnitude in the quiescent operating mode of the regulator circuit. In response to an increase in voltage at the regulated output, the operation of the second transistor is modified to increase the sink current to a second, greater, non-zero magnitude.

Abstract: A boost-type switching regulator includes an inductor; a rectifying element; a capacitor; a switching element; an output terminal; a detection voltage generating unit; an output voltage controlling unit; and a detection voltage level shifting unit. The detection voltage generating unit generates a detection voltage according to an output voltage. The output voltage controlling unit turns on and off the switching element to increase the output voltage when the detection voltage is smaller than a specific value, and to turn off the switching element to decrease the output voltage when the detection voltage is greater than the specific value. The detection voltage level shifting unit shifts the detection voltage so that the detection voltage during a voltage increasing period becomes greater than the detection voltage during a voltage decreasing period.

Abstract: A power supply circuit includes a transistor disposed between an input terminal to which an input voltage is applied and an output terminal to which an output voltage is applied, and an error amplifier configured to compare a feedback voltage varied based on the output voltage and a reference voltage, and control the transistor based on a result of the comparison, the reference voltage being generated by selectively using the input voltage or the output voltage.

Abstract: Provided is a voltage regulator capable of controlling an output voltage to a predetermined voltage quickly after an overshoot occurs in the output voltage. The voltage regulator includes: an overshoot detection circuit configured to detect a voltage that is based on an output voltage of the voltage regulator, and output a current corresponding to an overshoot amount of the output voltage; and an I-V converter circuit configured to control a current flowing through an output transistor based on a current controlled by an output of an error amplifier and a current flowing from the overshoot detection circuit.

Abstract: Constant current regulator (10) for supplying electrical power corresponding to a predetermined output power, comprising a plurality of modules (13) electrically connectable for simultaneous operation to jointly provide the output power, the modules are configured for providing a module output power contributing to the output power of the regulator. Each module comprises a transformer (135) for providing galvanic insulation as required by local standards, and a microcontroller (231) for controlling operation of the module. The constant current regulator comprises a data communication network (17) configured to be connected to the microcontrollers (231) of the modules (13), wherein the microcontrollers (231) are operable to exchange data over the data communication network (17) so as to make the constant current regulator (10) modular, meaning that one or more of such modules (13) can be added to or removed from the constant current regulator.

Abstract: According to an embodiment, a direct current to direct current (DC-to-DC) converter includes a power stage, a generating circuit, a voltage dividing circuit, a subtractor and a controller. The power stage converts an input voltage to a first output voltage. The generating circuit generates a reference voltage by selecting one of candidate voltages in accordance with a level of the first output voltage. The voltage dividing circuit divides the first output voltage to obtain a second output voltage. The subtractor calculates a differential voltage between the reference voltage and the second output voltage. The control circuit generates a control signal to control the level of the first output voltage based on the differential voltage.

Abstract: Disclosed herein is a switching converter capable of preventing a period in which a switch SW of a primary side is turned on and a period in which a synchronous rectifying switch SR SW of a secondary side is turned on from being overlapped with each other. The switching converter includes: a transformer T inducing primary energy to secondary side; a switch SW connected to a primary coil of the transformer T to switch a primary voltage; a synchronous rectifier SR connected to a secondary coil of the transformer T to rectify a secondary voltage; and a delay locked loop connected between the secondary coil and the synchronous rectifier SR, wherein the delay locked loop generates a signal synchronized with a turn-on control signal of the switch SW and outputs the generated signal to the synchronous rectifier SR to control a turn-off operation of the synchronous rectifier SR.

Abstract: A DC-DC converter device and method for controlling the DC-DC converter device includes controlling gate drivers connected to the respective gate of first and second resonant circuit switches of a resonant circuit, controlling gate drivers connected to the respective gate of first and second rectifier switches of a synchronous rectifier, and detecting whether a shutdown criteria is fulfilled or not. If the shutdown criteria is fulfilled, the method is further includes the step of sending a shutdown signal to a shutdown device.

Abstract: An immediate response low dropout regulation system includes a low dropout regulation unit, a tracking voltage generation unit, and a self-driving unit. The low dropout regulation unit is used for generating and outputting an inner output voltage according to a reference voltage. The tracking voltage generation unit is used for generating and outputting a tracking voltage according to the reference voltage. The self-driving unit is coupled to the low dropout regulation unit and the tracking voltage generation unit. When a voltage difference between the tracking voltage and the inner output voltage is greater than a constant times threshold voltage, the self-driving unit provides a compensation current to an output terminal of the low dropout regulation unit.

Abstract: A power management system may include a generator controller. The generator controller may (i) operate the generator; and (ii) prohibit a transfer switch from supplying first or second power to an output of the transfer switch. In some systems, the first power may be primary power (e.g., from a primary power source such as a utility) while the second power is secondary power (e.g., from a secondary power source such as a generator). In other systems, the second power may be primary power while the first power is secondary power, or both the first and second power may be secondary power.

Abstract: Constant current regulator (10) for supplying a series circuit (9) of a lighting installation with an output electrical power corresponding to a predetermined output power, comprising a plurality of modules (13) electrically connectable for simultaneous operation to jointly provide the output power, the modules being each configured for providing a module output power contributing to the output power of the regulator. Each module comprises its proper transformer (135) for providing galvanic insulation as required by local standards, and a microcontroller (231) for controlling operation of the module.

Abstract: Systems and processes for protecting a power converter against overvoltage conditions are disclosed. In one example, an overvoltage protection circuit may be used to sense the input voltage of the power converter to determine whether the input voltage is greater than a threshold value. In response to determining that the sensed input voltage is greater than the threshold value, an input capacitance and/or capacitance of an EMI filter of the power converter may be discharged to ground or an input return through a tapFET of a switching element of the power converter to protect the components of the device. The capacitance(s) may continue to be discharged through the tapFET for a duration of time after the sensed input voltage falls below the threshold value to allow the capacitance(s) to discharge to a safe level.

Abstract: The regulator with a low dropout voltage comprises an error amplifier comprising a differential pair of input transistors and a circuit with folded cascode structure connected to the output of the said differential pair, an output stage connected to the output node of the error amplifier, and a Miller compensation capacitor connected between the output stage and the cascode node on the output side (XP) of the cascode circuit; the error amplifier furthermore comprises at least one inverting amplifier module in a feedback loop between the said cascode node and the gate of the cascode transistor of the cascode circuit connected between the said cascode node and the said output node.

Abstract: A regulator comprises an amplifier, a bias circuit, and a current trimming circuit. The bias circuit is coupled to the amplifier and supplies a first bias current to the amplifier in a first mode of a system including the regulator. The current trimming circuit is coupled to the bias circuit to adjust the first bias current.