A method and apparatuses for power regulation using an extended current limit are disclosed. The power regulator detects an occurrence of an output current of the regulator exceeding a first current limit, triggers an extended current limit timer based on the detected occurrence, regulates the output current according to a second current limit higher than the first current limit based on a duration of the extended current limit timer, and regulates the output current according to the first current limit based on an expiration of the duration of the extended current limit timer.

A constant voltage generation circuit is provided. The constant voltage generation circuit includes a differential pair including a first transistor having a gate input with a reference voltage and a second transistor having a gate input with a signal corresponding to an output voltage, an output transistor that has a gate connected to a connection point between a drain of one transistor out of the differential pair and a load of the one transistor and that is configured to output the output voltage, and a diode connected between the gate of the output transistor and a power source.

During operation of an IC component within a first range of temperatures, a first bias voltage is applied to a first substrate region disposed adjacent a first plurality of transistors to effect a first threshold voltage for the first plurality of transistors. During operation of the IC component within a second range of temperatures that is distinct from and lower than the first range of temperatures, a second bias voltage is applied to the first substrate region to effect a second threshold voltage for the first plurality of transistors that is at least as low as the first threshold voltage.

A power control device includes: an output voltage controller configured to control an output voltage based on a feedback voltage corresponding to the output voltage; and an overvoltage protector configured to continue or stop the operation of the output voltage controller based on a first detection result of whether the output voltage has exceeded an output voltage threshold value and a second detection result of whether the feedback voltage has fallen to or below a feedback voltage threshold value.

A voltage booster powered by a primary electrical source for providing an adjustable voltage across the load, while a current regulator in series with the load maintains the desired current. When the voltage drop across the current regulator exceeds an upper threshold, the voltage booster's output voltage is reduced to a lower level to reduce the power dissipated by the current regulator, to improve efficiency. When the voltage drop across the current regulator is less than a lower threshold, the voltage booster output is increased to a higher level. In burst mode operation, the voltage booster output alternates between a full voltage and zero voltage, and an optional capacitor provides voltage across the resistive load during discharge. An optional diode can ensure that the capacitor discharges through the load in cases where the voltage booster output is not floating.

A power control device includes: an output voltage controller configured to control an output voltage based on a feedback voltage corresponding to the output voltage; and an overvoltage protector configured to continue or stop the operation of the output voltage controller based on a first detection result of whether the output voltage has exceeded an output voltage threshold value and a second detection result of whether the feedback voltage has fallen to or below a feedback voltage threshold value.

A low-dropout regulator (LDO) capable of providing high power-supply rejection ratio (PSRR) and good reverse isolation. The LDO may include a core circuitry and a reverse isolation circuitry. The core circuitry may include a PSRR circuitry coupled to an output node and configured to provide high PSRR at the output node. The reverse isolation circuitry may be configured to provide good reverse isolation at the output node by, for example, providing current in response to ripples at the output node. The reverse isolation circuitry may be configured with bandwidth higher than that of the core circuitry such that it can provide fast transient response. The reverse isolation circuitry may be configurable and/or reconfigurable for a desirable reverse isolation performance. The reverse isolation circuitry may be configurable and/or reconfigurable to trade off between power consumed by the reverse isolation circuitry and a leakage current flowing through the core circuitry.

A communication network power supply method and apparatus. The method comprises: before supplying power to an electric load, at least two paths of input voltages being connected in series; and according to the rated power of the electric load, performing isolation transformation processing on the input voltages connected in series, so as to obtain a voltage required by the electric load.

According to an aspect, a low dropout (LDO) voltage regulator includes a differential amplifier, a pass transistor coupled to an output of the differential amplifier, where the pass transistor is configured to provide an output voltage of the LDO voltage regulator, and a soft-start circuit coupled to the differential amplifier. The soft-start circuit is configured to adjust a soft-start driving signal to control a slope of the output voltage based on the output voltage during a start-up operation of the LDO voltage regulator.

Systems, methods, and circuitries are provided to generate a regulated supply voltage based on a target voltage. In one example, a method includes converting the target voltage to a first digital time-based signal and converting the regulated supply voltage to a second digital time-based signal. A difference signal is generated based at least on a difference between the first digital time-based signal and the second digital time-based signal. Regulator circuitry is controlled to generate the regulated supply voltage based at least on the difference signal.