389 results about "Linear regulator" patented technology

The invention provides a three-loop on-chip integrated low-dropout linear voltage regulator, which comprises a three-port source follower type voltage follower, which comprises a first anti-phase end, a normal phase end, a second anti-phase end and a first output end; the error amplifier is used for comparing a reference voltage with an output voltage so as to provide a first control signal for the first anti-phase end; the self-feedback bias module is used for receiving an internal voltage signal of the three-port source follower type voltage follower so as to provide a second control signal for the second anti-phase end; the grid electrode of the power tube is connected with the output end, the source electrode is connected with the power supply voltage, and the drain electrode serves as a second output end and is used for receiving the adjusting signal output by the first output end; the output driving current of the power tube is adjusted based on the adjusting signal; and the bias module is used for providing bias voltage for the three-port source follower type voltage follower and the error amplifier. The transient response performance of the voltage stabilizer can be improved under the condition of no off-chip large capacitance.

The invention discloses an overcurrent protection control circuit of a low-dropout linear regulator and the low-dropout linear regulator, and relates to the field of voltage regulators. A first sampling module is connected with a drain electrode, a grid electrode and a source electrode of a power control tube in the low-dropout linear regulator and a first current comparator; the first current comparator is further connected with the grid electrode of the first protection switch and the input voltage end of the low dropout linear regulator, the source electrode of the first protection switch is connected with the grid electrode of the power control tube, the drain electrode of the first protection switch is grounded, and the source electrode of the power control tube is connected with the voltage output end of the low dropout linear regulator; the second sampling module is respectively connected with the drain electrode of the power control tube, the grid electrode of the power control tube and the clamping module, the clamping module is connected with the grid electrode of the second protection switch through the second current comparator and is also connected with the source electrode of the power control tube, the drain electrode of the second protection switch is grounded, and the source electrode of the second protection switch is connected with the grid electrode of the power control tube. The reliability of current limiting can be improved.

The invention relates to the technical field of chip detection, and discloses a high-reliability power supply chip circuit fault detection system, which comprises a built-in self-test architecture integrated in a low dropout regulator chip, and the built-in self-test architecture is provided with a first test mode and a second test mode which are switched based on a mode switching control circuit. The detection module is used for detecting key performance parameters of an error amplifier sub-circuit in a low dropout linear regulator chip, the detection module is used for measuring the direct current loop gain, the offset voltage, the common mode rejection ratio and the power supply ripple rejection ratio of the amplifier in the first test mode, and the detection module is used for measuring the unity gain bandwidth of the amplifier in the second test mode. According to the invention, through the design of a built-in self-test architecture and two test modes, abnormal states such as differential circuit imbalance and feedback loop fault can be identified in a bare chip stage, chips with poor performance are rejected in advance, and the LDO chip is ensured to reach a ppb-magnitude high reliability standard.

The invention belongs to the technical field of analog integrated circuit design and memory read-write, and provides a multi-valued RRAM read-write circuit with a write-and-read function. The multi-valued RRAM read-write circuit is a multi-port device capable of performing read-write simultaneously, in write operation, a low dropout regulator is utilized to provide voltage for the RRAM circuit and the standard resistance circuit, mirror current is generated, the resistance value of the RRAM is set to be the total resistance of the standard resistance circuit, an operational amplifier is connected into the circuit through a CMOS switch, and feedback is formed to stabilize the voltage at the two ends of the RRAM; and in the read operation, the CMOS switch is used for disconnecting the operational amplifier, and the voltage at the two ends of the RRAM device is directly read. Compared with an existing multi-valued read-write circuit, the multi-valued RRAM read-write circuit has the advantages that write-and-read multi-valued RRAM read-write is realized, and meanwhile, the read-write circuit is not separated, so that the write-in speed is increased, and the area of the read-write circuit is saved.

The utility model provides a transient enhancement circuit applied to a low dropout regulator, and relates to the technical field of analog integrated circuits. The overvoltage detection circuit drives the charging and discharging circuit to charge the grid electrode of the power output tube to lower the output voltage when the output voltage of the low dropout linear regulator exceeds the first voltage threshold value, and meanwhile, the undervoltage detection circuit drives the charging and discharging circuit to charge the grid electrode of the power output tube to lower the output voltage when the output voltage is smaller than the second voltage threshold value. When the output voltage of the low dropout linear regulator changes instantly and rapidly along with a load or changes in a rapid jitter phenomenon of the input voltage, the charging and discharging circuit is driven to discharge the grid electrode of the power output tube so as to increase the output voltage. The low-dropout linear regulator can quickly and adaptively cooperate with a negative feedback loop included in the low-dropout linear regulator to realize a timely output voltage transient response adjustment effect, so that the corresponding output voltage can be effectively limited to a set threshold range and quickly recovered to a stable state.

The invention is suitable for the technical field of electronic circuits, and provides a wide-load-capacitance low-dropout linear regulator circuit, a power supply device and electronic equipment. The wide load capacitance low dropout linear regulator circuit comprises a bias module, a first operational amplifier module, a second operational amplifier module, a third operational amplifier module, a first compensation module and a second compensation module, and the first operational amplifier module is electrically connected with the bias module, the second operational amplifier module and the first compensation module. The third operational amplifier module is electrically connected with the second operational amplifier module, the second compensation module and the first operational amplifier module. A first zero point generated by the first compensation module is used for compensating the second pole, and a second zero point generated by the second compensation module is used for compensating the third pole. Therefore, according to the design architecture of the wide-load-capacitance low-dropout linear voltage regulator circuit provided by the embodiment of the invention, the two zero points effectively compensate the corresponding poles, the phase margin of the circuit is remarkably improved under the wide-range load capacitance, and the stability of the circuit is enhanced.

The invention relates to the field of integrated circuit design, and particularly discloses a high power supply rejection ratio and low swing driving frequency-locked loop circuit and a control method thereof, a low dropout regulator is adopted to provide independent power supply lower than a main power supply voltage for a voltage-controlled oscillator, and double optimization effects are achieved. The clean power supply provided by the low dropout linear regulator effectively isolates the interference of the main power supply noise to the voltage-controlled oscillator, so that the power supply noise suppression capability of the circuit is remarkably enhanced, and the jitter of an output clock signal is greatly reduced; and on the other hand, the working voltage of the voltage-controlled oscillator is allowed and dynamically regulated and controlled to be optimized in a low range meeting the performance according to the real-time load of the voltage-controlled oscillator, so that on-demand power supply is realized, the dynamic power consumption of the voltage-controlled oscillator is reduced to the maximum extent while the output quality is not reduced, and the energy efficiency of the whole circuit under different load conditions is improved.

The ultralow frequency sensor comprises a vibration detection unit, a power supply voltage stabilization unit and a signal conditioning unit, the power supply voltage stabilization unit is provided with a low dropout linear voltage regulator U20, a voltage converter U19 and a negative voltage regulator U21, and the low dropout linear voltage regulator U20 stabilizes an external power supply as a positive power supply VCC; the voltage converter U19 is used for converting positive voltage of an external power supply into negative voltage and outputting stable negative power supply VEE through the negative voltage stabilizer; the positive power supply VCC and the negative power supply VEE supply power to the signal conditioning unit; the signal conditioning unit comprises a high common mode rejection differential amplifier, a differential-to-single-ended amplifier, a band-pass filter and a differential output driver, a differential signal output by the vibration detection unit sequentially passes through the high common mode rejection differential amplifier, the differential-to-single-ended amplifier, the band-pass filter and the differential output driver, and then a differential voltage signal is output; the method has the advantages of high stability and reliability and the like.

The embodiment of the invention provides a multi-output isolated power supply, which comprises a power transformer comprising a single primary side coil and a single secondary side coil; a switch driving circuit coupled to the primary coil to output a driving voltage to the primary coil based on the input voltage; a rectification circuit coupled to the secondary coil and configured to rectify a voltage across the secondary coil to output a first DC voltage at a first rectified voltage output end and a second DC voltage at a second rectified voltage output end; and an output unit coupled to the first rectified voltage output terminal and the second rectified voltage output terminal, the output unit comprising one or more low dropout linear regulator circuits, where an output terminal of a predetermined low dropout linear regulator circuit is coupled to the secondary circuit ground, the output unit is configured to output at least one positive voltage and at least one negative voltage with a voltage at an output terminal of a predetermined low dropout linear regulator circuit as a reference.

A multi-input low-dropout (LDO) linear voltage stabilizing circuit and a control method therefor. The multi-input LDO linear voltage stabilizing circuit comprises a LDO unit, comprising a first LDO linear regulator (LDO1) and a second LDO linear regulator (LDO2) connected to a same output node, wherein the first LDO linear regulator (LDO1) comprises a first operational amplifier (AMP1) and a first power device (201), the input voltage of the first LDO linear regulator (LDO1) is a first input voltage (VIN), the second LDO linear regulator (LDO2) comprises a second operational amplifier (AMP2) and a second power device (202), and the input voltage of the second LDO linear regulator (LDO2) is a second input voltage (BIAS); and a reference voltage selection unit (10), used for selecting, when the first LDO linear regulator (LDO1) is switched to the second LDO linear regulator (LDO2), the reference voltage of the first operational amplifier (AMP1) as a second reference voltage (VREFb), and the reference voltage of the second operational amplifier (AMP2) as a first reference voltage (VREFa), wherein the first reference voltage (VREFa) is higher than the second reference voltage (VREFb). By optimizing the structure and the working time sequence of a multi-input LDO circuit, stable switching among different LDOs can be achieved, the power supply fluctuation amplitude of an internal analog circuit is greatly reduced, the output voltage of the LDOs during different switching does not trigger UVLO by mistake, and the normal working state and good performance of the circuit are guaranteed.

The invention provides a transimpedance type flip voltage following driving linear voltage regulator, which comprises a control module and a transimpedance type flip voltage follower, namely a TIFVF module, and is characterized in that the control module comprises an error amplifier and a voltage-current converter which are connected in series; the output voltage Vout passes through a selectable divider resistor and then is fed back to an error amplifier to be compared with the reference voltage Vref to obtain an error signal, the error signal is amplified and conditioned by a compensation network to obtain a control voltage signal Vctrl, and the control voltage signal Vctrl passes through a voltage-current conversion circuit to obtain a current control signal Ictrl required by the TIFVF; the whole forms a negative feedback loop, and two links of error amplifier-voltage and current conversion provide enough loop gain.

The present disclosure proposes a switching power supply, comprising a power supply capacitor, for generating a power supply voltage to supply a control chip of the switching power supply with power, its first end being connected to the power supply terminal of the control chip of the switching power supply, its second end being grounded, and the first end generates a power supply voltage; a linear regulator circuit connected between the first end of the power supply capacitor and a common connection end of the main power transistor and the auxiliary power transistor; wherein, the voltage at the connection end between the main power transistor and the auxiliary power transistor charges the power supply capacitor through the linear voltage regulator The present disclosure can save power consumption, improve the working efficiency of switching power supply, and optimize the EMI of switching power supplies.

An example apparatus includes a first transistor having a control terminal and first and second terminals. The apparatus includes a second transistor having a control terminal and first and second terminals, the second terminal of the second transistor coupled to the second terminal of the first transistor. The apparatus includes a first amplifier having a first input, a reference input, and an output, the first input of the first amplifier coupled to the first terminal of the first transistor, the output of the first amplifier coupled to the control terminal of the first transistor. The apparatus includes a second amplifier having first and second inputs and an output, the first input of the second amplifier coupled to the first terminal of the first transistor, the second input of the second amplifier coupled to the first terminal of the second transistor, and the output of the second amplifier coupled to the control terminal of the second transistor. The apparatus includes a control circuit coupled to the control terminal and the second terminal of the second transistor and coupled to the first transistor, the control circuit capable of adjusting a voltage at the control terminal of the second transistor responsive to a current through the first transistor.

The invention discloses a low output voltage detection circuit based on a low dropout linear regulator, relates to the technical field of power supply detection, and realizes accurate detection of an output voltage rising stage through cooperation of a first amplification delay circuit, a second amplification circuit and a first comparison circuit; through cooperation of a third amplification circuit, a fourth amplification time-delay circuit and a second comparison circuit, reliable monitoring of an output voltage drop stage is completed. Wherein the amplification circuit can flexibly adjust the amplification factor to adapt to wide-range output voltage detection; the time delay circuit can accurately regulate and control the signal overturning time sequence, and the system control requirement is met; the comparison circuit and the AND gate circuit construct a rigorous logic control system, and the accuracy of signal output is guaranteed. Through creative combination of the circuit modules, an efficient low-output voltage detection scheme is formed, the technical problem that the voltage establishment state cannot be reflected in a low-voltage scene is thoroughly solved, and accurate detection of the low-output voltage of the LDO is achieved.

The embodiment of the invention provides a multi-power-domain power management method, a power management system and electronic equipment, and relates to the technical field of power consumption management. The method is applied to a power supply normally open domain of the power supply management system, the power supply management system further comprises a main low dropout linear regulator, a plurality of power supply domains, a power supply switch array and an analog domain, the main low dropout linear regulator and the analog domain are connected with an external power supply, and the main low dropout linear regulator is connected with the power supply domains through the power supply switch array. The analog domain comprises a high-speed clock; the method comprises the following steps: in response to a standby mode entering instruction, sending a first control signal to an analog domain to turn off a high-speed clock; sending a group of second control signals to the power switch array to cut off power supply to at least one target power domain; and sending a third control signal to the main low-dropout linear voltage regulator to regulate the main low-dropout linear voltage regulator to enter a low-power-consumption working mode Therefore, the time for entering the low-power-consumption mode can be reduced.

The invention discloses a low dropout linear regulator with bidirectional current conduction capability, which is characterized in that two input ends of an error amplifier are respectively connected with signals VB and FB, and a power level of a linear transconductance ring is used as a light load power level; the first output end of the error amplifier is connected with the first input end of the linear transconductance ring, the first input end of the light load power level and the input end of the first source follower, and the output end of the first source follower is connected with the first input end of the heavy load power level. The second output end of the error amplifier is connected with the second input end of the linear transconductance ring, the second input end of the light load power level and the input end of the second source follower, and the output end of the second source follower is connected with the second input end of the heavy load power level. The problem that the quiescent current of a traditional bidirectional current conduction LDO is too large under the conditions of light load and no load is solved, and it is guaranteed that the output power tube can be completely conducted when the LDO works in an open loop mode.

According to the control on-chip low dropout linear regulator and off-chip triode current distribution circuit provided by the embodiment of the invention, two signals output by a common end between a drain electrode of a first NMOS (N-channel Metal Oxide Semiconductor) tube and a first current source and a common end between a drain electrode of a second NMOS tube and a second current source are utilized; the logic of the digital control unit is controlled, and the purpose of distributing current between the interior of the low-voltage linear voltage regulator and the triodes according to a design value is achieved.

The present disclosure relates to a device having a supply input receiving a supply voltage, a switched-mode power supply comprising an output at which is generated a supply voltage, and a voltage linear regulator supplying a load, the regulator receiving the supply voltages, the regulator including two transistors coupled between the supply input, respectively the output of the supply, and an output node of the regulator. When the current drawn by the load is below a threshold, an output current delivered to the load is equal to a current flowing through the transistor, so that, when the current drawn by the load is above the threshold, the output current is equal to a current flowing through the transistor plus a current flowing through the transistor.

A flyback power converter includes a power transformer, a first lossless voltage conversion circuit, a first low-dropout linear regulator and a secondary side power supply circuit. The first low-dropout linear regulator (LDO) generates a first operation voltage as power supply for being supplied to a sub-operation circuit. The secondary side power supply circuit includes a second lossless voltage conversion circuit and a second LDO. The second LDO generates a second operation voltage. The first operation voltage and the second operation voltage are shunted to a common node. When a first lossless conversion voltage is greater than a first threshold voltage, the second LDO is enabled to generate the second operation voltage to replace the first operation voltage as power supply supplied to the sub-operation circuit; wherein the second lossless conversion voltage is lower than the first lossless switching voltage.

The invention provides a low dropout regulator and a power management system, and relates to the technical field of power management. The low dropout linear regulator comprises a power supply assembly, an operational amplifier module, a reference voltage module, a regulating module and a feedback module, wherein the regulating module at least comprises one NMOS (N-channel Metal Oxide Semiconductor) regulating tube. The power supply assembly is used for providing power supply voltage for the operational amplifier module, and the value of the power supply voltage is larger than the driving voltage value of the NMOS adjusting tube. The reference voltage module is used for providing reference voltage for the operational amplifier module; the feedback module is used for obtaining a first feedback voltage based on the output voltage of the voltage stabilizer; the operational amplifier module is used for generating a control signal according to the reference voltage and the output voltage so as to adjust the conduction degree of the NMOS adjusting tube. Based on this, the problem of balance among the output capability, stability and power consumption of the charge pump in the prior art can be improved, and the transient response speed and the low power consumption performance are considered at the same time.

The application discloses a kind of static current control systems of double data rate linear voltage regulator, including reference generating circuit and by feedback control circuit, error amplifier circuit and power output circuit constitute idle power consumption control circuit, reference voltage VREF generated by reference generating circuit is exported to feedback control circuit, after feedback control circuit compares the control signal output by error amplifier circuit, exports to error amplifier circuit to make the control signal output by error amplifier circuit also change, the control signal in turn controls upper and lower power tube in power output circuit, by adjusting VREF generated by reference generating circuit, to flexibly adjust system idle power consumption, while considering low power consumption and the fast transient response of load switching.

The present application relates to the technical field of analog circuit, and discloses a charge pump.The charge pump comprises a first voltage boosting control circuit, a second voltage boosting control circuit, a first voltage lifting circuit and a second voltage lifting circuit.The first voltage boosting control circuit can generate a first multiplex signal at a first node and a second multiplex signal at a second node in response to an input voltage and a control signal.The second voltage boosting control circuit comprises a third node and a fourth node.The first voltage lifting circuit is connected between the first node and the third node, and the second voltage lifting circuit is connected between the second node and the fourth node.When the control signal is a first level signal, the first voltage lifting circuit lifts the voltage of the third node to a first multiplex voltage according to the first multiplex signal, and the second voltage boosting control circuit outputs a target voltage in response to the first multiplex voltage of the third node and the input voltage.The same is true when the control signal is a second level signal.Therefore, the embodiment does not need to increase an additional circuit to drive the charge pump.

A linear regulator includes: a first output stage circuit for generating a first output voltage according to a first control voltage; and a calibration circuit, enabled during a first calibration period after startup of the linear regulator. During the first calibration period, the calibration circuit is configured to operably generate the first control voltage based on an output-related signal and a reference voltage, and the output-related signal is related to the first output voltage. The first output stage circuit and the calibration circuit form a first control loop which enters an open-loop state after the end of the first calibration period. The first output stage circuit includes a second control loop, configured to operably regulate the first output voltage in a closed-loop manner based on the first control voltage and a variation of the first output voltage during an operational period following the first calibration period.

An embodiment of the present application discloses a low dropout linear regulator and a power supply device. The low dropout linear regulator includes a voltage dividing module, a switching module, a feedback module, and an energy storage module. The first end of the voltage dividing module is connected to the positive pole of the input power supply and the first end of the switching module. The second end of the voltage dividing module is connected to the second end of the switching module and the first end of the feedback module. The third end of the switching module is connected to the second end of the feedback module and the first end of the energy storage module. The second end of the energy storage module is connected to the third end of the voltage dividing module and the negative pole of the input power supply. Among them, the connection point between the third end of the switching module, the second end of the feedback module, and the first end of the energy storage module is the first connection point. The switching module is used to switch the switch state based on the voltage across the feedback module. Through the above method, the function of the low dropout linear regulator can be realized with a relatively simple circuit structure, and the cost is relatively low.

The application provides a transient response enhanced multi-loop low-dropout linear voltage regulator, comprising: a bias module for providing a bias voltage; a band gap reference module for providing a reference voltage; a power tube for providing an output voltage; a voltage follower for generating a control voltage and a driving current based on the bias voltage and the reference voltage; a source-coupled error amplifier for generating a gain voltage according to the output voltage and the control voltage; a common gate for generating a first voltage according to the reference voltage and the gain voltage; a pseudo-differential common gate for generating a second voltage according to the reference voltage and the gain voltage; and a dynamic super source follower for forming a push-pull structure at the gate of the power tube according to the first voltage and the second voltage. The application can effectively improve the transient response performance of the voltage regulator.

A multi-die module includes: a first semiconductor die having an internal line, an external electrode, and multiple internal electrodes and including a first control circuit that control a DC-DC converter; a second semiconductor die having multiple internal electrodes and including a second control circuit that controls a linear regulator; and a package that supports the first and second semiconductor dies. The second control circuit includes a voltage comparison circuit having a feedback input, a reference input, and a comparison output. In each of the first and second semiconductor dies, the multiple internal electrodes includes a first internal electrode. The feedback input of the voltage comparison circuit is connected to the first internal electrode of the second semiconductor die, which is connected to the first internal electrode of the first semiconductor die. The internal line connects the first internal electrode of the first semiconductor die to the external electrode.

The utility model discloses a pulse modulation circuit of an ultra-wideband super-continuum fiber laser, belongs to the technical field of ultra-wideband super-continuum fiber lasers, and solves the problem that the phase noise floor of a clock circuit is directly lifted due to the fact that power supply ripple coupling and LDO filter network efficiency is insufficient, for example, the output capacitance ESR is too high or a pi-type filter is missing. Comprising an input filtering module, a low dropout linear regulator module, a pi-type filter module, a clock power supply distribution module and a grounding system module. According to the utility model, high-frequency ripple filtering, voltage ripple depth suppression and residual noise absorption are carried out on power supply output through a three-stage sequential filtering framework, and finally, super-stable power supply with a phase noise base lower than-152dBc / Hz and 1kHz offset is provided for the clock circuit, so that the time sequence precision of super-continuum spectrum laser pulses is ensured.

The application discloses a micro-power-consumption fast-response low-voltage-difference linear voltage stabilizer with mode control function, which comprises a dual-mode controller, a SET end of an external partial voltage resistor is connected to a negative phase input end of the dual-mode controller, a positive phase end of the dual-mode controller is connected to GND, an output end of the dual-mode controller is connected to a positive phase input end of a controller of an error amplifier, and the dual-mode controller is used for adjusting the stabilizer to be in a fixed output voltage mode or an adjustable output voltage mode; a negative phase input end of the error amplifier is connected to a reference voltage V REF , an output end is connected to an input end of a driving circuit with voltage clamping function; an output end of the driving circuit with voltage clamping function is connected to a gate of an M p1 high-voltage PMOS transistor, a substrate and a source are connected to an input voltage V IN , and a drain is connected to an output end OUT of the stabilizer; when the linear voltage stabilizer is applied, the type of capacitor and the equivalent resistance of capacitor series connection do not need to be considered, and the needs of micro-power-consumption electronic system power supply and battery power supply system can be met.

A programmable battery pack including a switch arrangement module having at least one rechargeable battery with and at least one single pole single throw (SPST) switch, a system power supply having at least one linear regulator and at least one single pole single throw (SPST) switch, at least one controller module having a micro-controller executing a pre-programmed firmware, and an external power supply.

Embodiments of the present application provide a high-power low-dropout linear regulator system, which can be applied to the field of electronic circuit and power filter technology. The linear regulator system comprises a feedback compensation module and a driving sampling module, wherein the driving sampling module comprises a driving unit, a power adjustment transistor and a voltage dividing and sampling network; the voltage dividing and sampling network is configured to divide the initial output voltage to generate a feedback voltage signal; the feedback compensation module is configured to perform error amplification processing on the feedback voltage signal and a reference voltage signal from a reference voltage source to output a driving signal; the driving unit is configured to perform impedance conversion on the driving signal to output a buffer driving signal; and the power adjustment transistor is configured to linearly convert a direct current input voltage provided by a direct current power supply into an output voltage after voltage stabilization according to the buffer driving signal.