CN110377088A - A kind of integrated circuit, low-dropout linear voltage-regulating circuit and its control method - Google Patents
A kind of integrated circuit, low-dropout linear voltage-regulating circuit and its control method Download PDFInfo
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- CN110377088A CN110377088A CN201910620205.2A CN201910620205A CN110377088A CN 110377088 A CN110377088 A CN 110377088A CN 201910620205 A CN201910620205 A CN 201910620205A CN 110377088 A CN110377088 A CN 110377088A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
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Abstract
A kind of low-dropout linear voltage-regulating circuit, including reference circuit, voltage control loop, driving current controlling brancher and load current controlling brancher.Reference circuit generates reference current and reference voltage, reference voltage is linked into voltage control loop to generate the output voltage of low pressure difference linearity and driving current, and pass through control driving current controlling brancher and load current controlling brancher, realize that low-dropout linear voltage-regulating circuit in wide drive current range, maintains high current efficiency.
Description
Technical field
The application belongs to CMOS IC design technical field more particularly to a kind of integrated circuit, low pressure difference linearity are steady
Volt circuit and its control method.
Background technique
Mancarried electronic aid is either powered after over commutation by electric main, or is powered by battery group, worked
Cheng Zhong, supply voltage will all change in very large range.The shadow that the output voltage of various rectifiers is not only changed by line voltage
It rings, is also influenced by load variation.In order to guarantee that supply voltage is stablized constant, almost all of electronic equipment all uses voltage-stablizer
Power supply.Miniature precision electronic equipment also requires power supply very clean, works normally in order to avoid influencing electronic equipment.In order to meet precision
The requirement of electronic equipment, should the input terminal of power supply be added low-dropout linear voltage-regulating circuit (Low Dropout Regulator,
LDO)。
Traditional low-dropout linear voltage-regulating circuit is made of reference circuit and control loop two parts.Reference circuit is for producing
The raw reference voltage unrelated with power supply.Control loop include three parts: for detect and generate error correction signal operational amplifier,
For detecting the feedback network of output and for adjusting and being connected from non-pressure stabilizing input terminal to output end of pressure-stabilizing load current
Power tube.Generally, in order to improve current efficiency, need to guarantee that the quiescent current of low pressure difference linear voltage regulator is small as far as possible.Quiet
In the case that state electric current is fixed, maximum output current can only be increased by increasing the size of power tube.But driving pipe size
It is excessive, in low current load, it is contemplated that the electric leakage of the influence of process corner, supply voltage and temperature, driving tube will lead to
Low-dropout linear voltage-regulating circuit output voltage is excessively high.As it can be seen that traditional low-dropout linear voltage-regulating circuit can not be in wide driving current
In dynamic range, guarantee high current efficiency.
Summary of the invention
The application's is designed to provide a kind of integrated circuit, low-dropout linear voltage-regulating circuit and its control method, it is intended to
Solve the problem of that traditional low-dropout linear voltage-regulating circuit can not guarantee high current efficiency in wide driving current dynamic range.
The first aspect of the embodiment of the present application provides a kind of low-dropout linear voltage-regulating circuit, comprising:
Output terminal；
Power supply terminal, the power supply terminal is for accessing power supply；
Common potential terminal, the common potential terminal is for connecting common potential；
Reference circuit is connect with the power supply terminal and the common potential terminal, and the reference circuit is for generating
The reference voltage unrelated with power supply；
Voltage control loop, output end, the power supply terminal and the common potential terminal with the reference circuit
Connection, the voltage control loop are set as being generated output voltage based on the reference voltage and provide the first driving current defeated
The output end of outlet output, the voltage control loop connects the output terminal；
Driving current controlling brancher is connect with the output terminal and the power supply terminal, the drive respectively by switch
Streaming current controlling brancher is used to load the second driving current in the output end of the voltage control loop, so that the output terminal
Driving current increase；And
Load current controlling brancher is serially connected between the output terminal and the common potential terminal, institute by switch
Load current controlling brancher is stated in the output terminal offered load electric current.
The driving current controlling brancher is specifically used for being chosen whether according to loading demand in one of the embodiments,
Second driving current is loaded in the output end of the voltage control loop.
The voltage control loop includes operational amplifier, feedback network and the first power in one of the embodiments,
Pipe, the inverting input terminal of the operational amplifier connect the output end of the reference circuit, and the positive of the operational amplifier is defeated
Enter the output end that end connects the feedback network, the control terminal of first power tube connects the output of the operational amplifier
End, the first conduction terminal of first power tube connect the power supply terminal, the second conduction terminal connection of first power tube
The first end of the feedback network and as the voltage control loop output end, the second termination public affairs of the feedback network
Common-battery position terminal.
The driving current controlling brancher includes first switch, second switch and second in one of the embodiments,
Power tube, the first end of the first switch are connect with the output end of the operational amplifier, the second end of the first switch,
The first end of the second switch and the control terminal of second power tube are connected with each other, the second end of the second switch and
First conduction terminal of second power tube connects the power supply terminal, described in the second conduction terminal connection of second power tube
Output terminal.
The load current controlling brancher includes third switch and current loading, the electricity in one of the embodiments,
One end of current load connects the output terminal, another termination common potential end of the current loading by third switch
Son.
The feedback network includes the first division module and the second division module in one of the embodiments, and described the
First end of the first end of one division module as the feedback network, the second end of first division module and the second partial pressure
The first end of module connects altogether and the output end as the feedback network, and the second end of second division module is as described anti-
Present the second end of network.
First power tube and second power tube are PMOS tube, the PMOS tube in one of the embodiments,
Grid, source electrode, drain electrode is respectively as the control terminal, the first conduction terminal, the second conduction terminal.
The reference circuit includes: in one of the embodiments,
Mirror image circuit, the power end of the mirror image circuit connect the power supply terminal, and the input terminal of the mirror image circuit connects
Connect bias current；
Biasing circuit is connected between the input terminal of the mirror image circuit and the common potential terminal, the biased electrical
Road can self-conductance pass to the input terminal in the mirror image circuit and form the bias current；And
First load, first load are connected between the output end of the mirror image circuit and common potential terminal, institute
It states bias current described in mirror image circuit mirror image and acts on first load, to generate reference voltage in output end.
The biasing circuit includes the first transistor and the second load, the first crystal in one of the embodiments,
Pipe is threshold voltage close to no-voltage or the Native NMOS tube of negative voltage, and the drain electrode of the first transistor connects the mirror
As the input terminal of circuit, the source electrode of the first transistor connects the first end of second load, and the of second load
The substrate at two ends, the grid of the first transistor and the transistor connects common potential terminal.
The mirror image circuit includes the second transistor and third transistor of same attribute, institute in one of the embodiments,
Power end of first conduction terminal of the first conduction terminal and the third transistor of stating second transistor as the mirror image circuit,
Input terminal of second conduction terminal of the second transistor as the mirror image circuit, the second conduction terminal of the third transistor
As the output end of the mirror image circuit, the grid and described second of the grid of the second transistor and the third transistor
Second conduction terminal of transistor connects altogether.
The second aspect of the embodiment of the present application provides a kind of controlling party based on the low-dropout linear voltage-regulating circuit
Method, the control method includes two ways:
Mode one:
When load circuit switches to big power consumption mode by low-power consumption mode, the first step, by controlling the load current
Controlling brancher switch, in output terminal offered load electric current；Second step is switched by controlling the driving current controlling brancher,
The second driving current is loaded in output terminal, at this point, low-dropout linear voltage-regulating circuit work is under heavy duty mode；Third step,
Load circuit is switched into big power consumption mode；
When load circuit switches to low-power consumption mode by big power consumption mode, load circuit is switched to low function by the first step
Consumption mode；Second step is switched by controlling the driving current controlling brancher, closes the second driving current in output terminal, this
When, low-dropout linear voltage-regulating circuit works in light load mode；Third step is opened by controlling the load current controlling brancher
It closes, closes load current in output terminal；
Mode two:
When load circuit switches to big power consumption mode by low-power consumption mode, the first step, by controlling the load current
Controlling brancher switch, in output terminal offered load electric current；Second step is switched by controlling the driving current controlling brancher,
The second driving current is loaded in output terminal, at this point, low-dropout linear voltage-regulating circuit work is under heavy duty mode；Third step,
Load circuit is switched into big power consumption mode；4th step is switched by controlling the load current controlling brancher, in output terminal
Close load current；
When load circuit switches to low-power consumption mode by big power consumption mode, the first step, by controlling the load current
Controlling brancher switch, in output terminal offered load electric current；Load circuit is switched to low-power consumption mode by second step；Third step,
By controlling the driving current controlling brancher switch, the second driving current is closed in output terminal, at this point, low pressure difference linearity is steady
Volt circuit works in light load mode；4th step is switched by controlling the load current controlling brancher, is closed in output terminal
Load current.
The third aspect of the embodiment of the present application provides a kind of integrated circuit, including above-mentioned low-dropout linear voltage-regulating circuit.
Reference circuit in above-mentioned low-dropout linear voltage-regulating circuit generates reference current and reference voltage, by reference voltage
Voltage control loop is linked into generate the output voltage of low pressure difference linearity and driving current, and passes through control driving current control
Branch and load current controlling brancher processed realizes that low-dropout linear voltage-regulating circuit in wide drive current range, maintains high current
Efficiency.
Detailed description of the invention
It in order to more clearly explain the technical solutions in the embodiments of the present application, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only some of the application
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the module diagram of low-dropout linear voltage-regulating circuit provided by the embodiments of the present application；
Fig. 2A is the Working mould of mode one in the control method of low-dropout linear voltage-regulating circuit provided by the embodiments of the present application
Formula switching flow figure；
Fig. 2 B is the Working mould of mode two in the control method of low-dropout linear voltage-regulating circuit provided by the embodiments of the present application
Formula switching flow figure；
Fig. 3 is the exemplary circuit schematic diagram of low-dropout linear voltage-regulating circuit shown in FIG. 1；
Fig. 4 is the module diagram of the reference circuit in low-dropout linear voltage-regulating circuit provided by the embodiments of the present application；
Fig. 5 is the exemplary circuit schematic diagram of reference circuit first embodiment shown in Fig. 4；
Fig. 6 is the exemplary circuit schematic diagram of reference circuit second embodiment shown in Fig. 4.
Specific embodiment
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the application, and
It is not used in restriction the application.
Referring to Fig. 1, the low-dropout linear voltage-regulating circuit integrated in integrated circuits that one embodiment of the application provides
Including power supply terminal VCC, common potential terminal VSS, output terminal VLDO, reference circuit 100, voltage control loop 200, driving
Current control branch 300 and load current controlling brancher 400.
Power supply terminal VCC is for accessing power supply, and common potential terminal VSS is for connecting common potential, such as big, output
Terminal VLDOFor exporting output voltage.Reference circuit 100 is connect with power supply terminal VCC and common potential terminal VSS, benchmark
Circuit 100 is for generating the reference voltage V unrelated with power supplyREF；The output end of voltage control loop 200 and reference circuit 100,
Power supply terminal VCC and the VSS connection of common potential terminal, voltage control loop 200 are set as according to reference voltage VREFIt generates defeated
Voltage and the first driving current I of offer outout1It is exported in output end, the output end of voltage control loop 200 connects output terminal
VLDO；Driving current controlling brancher 300 have switch, by switch respectively with output terminal VLDO, power supply terminal VCC and public
The VSS connection of current potential terminal, driving current controlling brancher 300 are used for output terminal VLDOLoad the second driving current Iout2, so that defeated
Terminal V outLDOElectric current increase, load current controlling brancher 400 pass through have switch, by switch be serially connected in output terminal VLDO
Between common potential terminal VSS, load current controlling brancher 400 is used in output terminal VLDOOffered load electric current.
In order to improve current efficiency, need to guarantee that the quiescent current of low pressure difference linear voltage regulator is small as far as possible.In low voltage difference line
Property voltage-stablizer quiescent current it is fixed in the case where, low pressure difference linear voltage regulator can only be increased by increasing the size of driving tube
Driving current.But driving tube is oversized, in low current load, it is contemplated that process corner, supply voltage and temperature
The influence of degree, it is excessively high that the electric leakage of driving tube will lead to low-dropout linear voltage-regulating circuit output voltage, innovative, negative by introducing
Carry the appearance that current control branch 400 avoids the state.
In addition, also disclosing the control method based on the low-dropout linear voltage-regulating circuit, which includes two
Kind executive mode, specifically:
Fig. 1 and Fig. 2A are please referred to, mode one:
When load circuit switches to big power consumption mode by low-power consumption mode, the first step, by controlling the load current
Controlling brancher 400 switchs, in output terminal VLDOOffered load electric current；Second step, by controlling the driving current controlling brancher
300 switches, in output terminal VLDOLoad the second driving current Iout2, at this point, low-dropout linear voltage-regulating circuit work is in heavy duty
Under mode；Load circuit is switched to big power consumption mode by third step；
When load circuit switches to low-power consumption mode by big power consumption mode, load circuit is switched to low function by the first step
Consumption mode；Second step is switched by controlling the driving current controlling brancher 300, in output terminal VLDOClose the second driving electricity
Flow Iout2, at this point, low-dropout linear voltage-regulating circuit work is in light load mode；Third step, by controlling the load current control
Branch 400 processed switchs, in output terminal VLDOClose load current；
Fig. 1 and Fig. 2 B is please referred to, mode two:
When load circuit switches to big power consumption mode by low-power consumption mode, the first step, by controlling the load current
The switch of controlling brancher 400, in output terminal VLDOOffered load electric current；Second step, by controlling the driving current control branch
The switch on road 300, in output terminal VLDOLoad the second driving current Iout2, at this point, low-dropout linear voltage-regulating circuit work is in weight
Under load model；Load circuit is switched to big power consumption mode by third step；4th step is controlled by controlling the load current
The switch of branch 400, in output terminal VLDOClose load current；
When load circuit switches to low-power consumption mode by big power consumption mode, the first step, by controlling the load current
The switch of controlling brancher 400, in output terminal VLDOOffered load electric current；Load circuit is switched to low-power consumption mould by second step
Formula；Third step is switched by controlling the driving current controlling brancher 300, in output terminal VLDOClose the second driving current
Iout2, at this point, low-dropout linear voltage-regulating circuit work is in light load mode；4th step is controlled by controlling the load current
The switch of branch 400, in output terminal VLDOClose load current.
Referring to Fig. 3, voltage control loop 200 includes operational amplifier OPB, feedback network 202 and the first power tube
The output end of the inverting input terminal connection reference circuit 100 of PB0, operational amplifier OPB, the positive input of operational amplifier OPB
The output end of end connection feedback network 202, the output end of the control terminal connection operational amplifier OPB of the first power tube PB0, first
The first conduction terminal of power tube PB0 connects power supply terminal VCC, and the second conduction terminal of the first power tube PB0 connects feedback network 202
First end and as the output end of voltage control loop 200 to export output voltage, the second termination of feedback network 202 is public
Common-battery position VSS.Wherein, operational amplifier OPB is used to detect and generate error correction signal, and feedback network 202 is used to detect output, the
One power tube PB0 is used to adjust and be connected from non-pressure stabilizing input terminal (i.e. power supply terminal VCC) to output end of pressure-stabilizing (low pressure difference linearity
The output end of voltage regulator circuit) load current.
In one embodiment, feedback network 202 includes the first division module and the second division module, the first division module
First end of the first end as feedback network 202, the first end of the second end of the first division module and the second division module is total
It connects and the output end as feedback network 202, second end of the second end of the second division module as feedback network 202.First
Division module and the second division module can be at least one for the transistor etc. of resistance, capacitor, inductance, other forms.
In the present embodiment, the first division module and the second division module are respectively by taking resistance RB0, RB1 as an example, the first power tube
PB0 is by taking PMOS tube as an example, and the grid of PMOS tube, source electrode, drain electrode are respectively as control terminal, the first conduction terminal, the second conduction terminal.
Referring to Fig. 3, driving current controlling brancher 300 includes first switch SW0, second switch SW1 and the second power
The first end of pipe PB1, first switch SW0 are connect with the output end of operational amplifier OPB, the second end of first switch SW0, second
The first end of switch SW1 and the control terminal of the second power tube PB1 are connected with each other, the second end of second switch SW1 and the second function
The first conduction terminal of rate pipe PB1 connects power supply terminal VCC, and the second conduction terminal of the second power tube PB1 connects output terminal VLDO。
Load current controlling brancher 400 includes third switch SW2 and current loading 410, and one end of current loading 410 passes through
Third switch SW2 connection output terminal VLDO, another termination common potential terminal VSS of current loading 410.
Optionally, the second power tube PB1 is PMOS tube, and the grid of PMOS tube, source electrode, drain electrode are respectively as control terminal, the
One conduction terminal, the second conduction terminal.In other embodiments, power tube can be triode.First switch SW0, second switch
SW1 and third switch SW2 is active device switch, such as triode, metal-oxide-semiconductor.
Second power tube PB1 is used to adjust and be connected load current i.e. second from non-pressure stabilizing input terminal to output end of pressure-stabilizing
Driving current Iout2, the second power tube PB1 is by switch SW0 and SW1 control；Load current controlling brancher 400 is used to low voltage difference
The output of linear voltage regulator provides current loading, and load circuit controlling brancher 400 is controlled by third switch SW2.Wherein, about function
Rate pipe PB1 switch working state is described as follows: switch SW0 closure, switch SW1 are disconnected, and LDO works under heavy duty mode；
Switch SW0 is disconnected, and switch SW1 closure, LDO works under light load mode；Wherein, about 400 work of load current controlling brancher
Make being described as follows for state: switch SW2 closure opens the current loading 400 of LDO；Switch SW2 is disconnected, and the electric current for closing LDO is negative
Carry 400.
Low voltage difference linear stabilizer output voltage VLDOFormula is as follows:
Current efficiency IeffIt reflects low pressure difference linear voltage regulator and provides the efficiency of output electric current to load, expression formula is as follows:
Wherein, Iout_maxFor the maximum output current of low pressure difference linear voltage regulator, IqFor the static state of low pressure difference linear voltage regulator
Electric current.
By formula 2,3 it is found that under the premise of guaranteeing high current efficiency, driving current dynamic range headroom can be by Iout1_max
It is widened to Iout1_max+Iout2_m2x；In this way, the application is switched by LDO weight load model, before guaranteeing high current efficiency
It puts, widens drive current range.
Referring to Fig. 4, reference circuit 100 includes biasing circuit 110, mirror image circuit 120 and the first load 130.Mirror image
The power end of circuit 120 connects bias current Iq, mirror image circuit for connecting power supply terminal VCC, the input terminal of mirror image circuit 120
120 mirror image bias current Iq are in output end outputting reference electric current I_REF；Biasing circuit 110 is connected to the defeated of mirror image circuit 120
Enter between end and common potential terminal VSS, 110 energy self-conductance of biasing circuit passes to the input terminal formation biasing in mirror image circuit 120
Electric current Iq.First load 130 is connected between the output end of mirror image circuit 120 and common potential terminal VSS, mirror image circuit 120
Mirror image bias current Iq obtains reference current I_REFAnd the first load 130 is acted on, to generate reference voltage V in output endREF。
In this way, reference circuit 100 may only be stablized under normal operating conditions in the case where adding power supply, the circuit is without " letter
And " bias point, start-up circuit is not needed, low energy consumption.It is understood that reference circuit 100 can also use traditional scheme,
Such as the reference circuit of tape starting circuit.
Referring to Fig. 5, biasing circuit 110 includes that the first transistor and second load 112 in one of the embodiments,
The first transistor is threshold voltage close to no-voltage or the Native NMOS tube NB0 of negative voltage, and the drain electrode of the first transistor connects
The input terminal of mirror image circuit 120, the source electrode of the first transistor connect the first end of second load 112, the second load 112
The substrate of second end, the grid of the first transistor and transistor connects common potential terminal.The threshold value of Native NMOS tube NB0
Voltage VTNative NMOSIt, can be direct in the case where reference circuit 100 is connected with the mains for close to zero positive voltage or negative voltage
Conducting does not need start-up circuit driving.In other embodiments, the first transistor 201 can be other from conduction device.The
One the 202, second load 112 of load and current loading 400 can be active impedance or passive impedance, utilize passive resistance in this example
It is illustrated for anti-resistance RB2.In other embodiments, 202 second load 112 of the first load and current loading 400
It can be at least one such as resistance, capacitor, inductance, transistor.
In one of the embodiments, referring to Fig. 5, mirror image circuit 120 includes the second transistor 121 and of same attribute
Three transistors 122, the first conduction terminal of second transistor 121 and the first conduction terminal of third transistor 122 are as mirror image circuit
120 power end, input terminal of the second conduction terminal of second transistor 121 as mirror image circuit 120, third transistor 122
The grid of output end of second conduction terminal as mirror image circuit 120, the grid of second transistor 121 and third transistor 122 and
Second conduction terminal of second transistor 121 connects altogether.For example, second transistor 121 and third transistor 122 constitute it is ambipolar basic
Current mirror, metal-oxide-semiconductor fundamental current mirror or cascade current mirror.
Second transistor 121 and third transistor 122 are PMOS tube PB2, PB3, PMOS tube in one of the embodiments,
The source electrode of PB2, PB3 are as the first conduction terminal, and the drain electrode of PMOS tube PB2, PB3 is as the second conduction terminal.
The reference circuit 100 is acted on resistance RB2 by the source of the Native NMOS tube NB0 of grounded-grid, is utilized
Native NMOS tube NB0 threshold V TNative NMOSClose to zero or the characteristic that is negative, bias current Iq is generated.Pass through
PMOS tube PB3 mirror image bias current Iq generates reference current I_ of different sizesREF, I_REF=n*Iq (n=1,2,3 ...), specifically
Ground, bias current Iq and reference current I_REFFormula difference it is as follows:
First load 130 in one of the embodiments, is active impedance, including the 4th transistor, the 4th transistor with
The connection type of diode is connected between the output end of mirror image circuit 120 and common potential terminal VSS.Specifically, the 4th is brilliant
The first conduction terminal and grid of body pipe are connect with the output end of mirror image circuit 120, and the second conducting termination of the 4th transistor is public
Current potential terminal VSS.For example, the 4th transistor is NMOS tube NB1, the drain electrode of NMOS tube NB1 is led as the first of the 4th transistor
Go side, second conduction terminal of the source electrode of NMOS tube NB1 as the 4th transistor.In other embodiments, the first load 130 can be with
For resistance, capacitor, inductance, other forms at least one such as transistor.
In this example, by taking the first load 130 is NMOS tube as an example, PMOS tube PB3 mirror image bias current n*Iq excessively (n=1,2,
3 ...) it acts on the NMOS tube NB1 of diode connection, generates reference voltage VREF, calculation formula is as follows:
Wherein, KPNB1For the device technology parameter of NMOS tube NB1；For the device breadth length ratio of NMOS tube NB1；VTNB1For
The device threshold voltage of NMOS tube NB1.
When this programme reference circuit 100 is integrated in IC chip, change in process conditions, operating temperature
When, reference voltage VREFIt can change.In general, in IC chip relative to except reference circuit 100 other are negative
Carry the digital circuit to be collectively formed by PMOS and NMOS, that is to say, that load performance is codetermined by PMOS tube and NMOS tube.
And in upper one embodiment, reference voltage VREFIt is only related to NMOS tube NB1, so that reference voltage VREFNot with load circuit
Match, influences load circuit performance.
Therefore, in another embodiment, referring to Fig. 6, first load 130 further include with the 4th transistor properties not
With the 5th transistor, the 5th transistor is connected to the defeated of the 4th transistor and mirror image circuit 120 with the connection type of diode
Between outlet.I.e. so that the first load 130 includes the transistor of two kinds of different attributes simultaneously, such as above-mentioned, the 4th transistor is
NMOS tube NB1, then the 5th transistor should be PMOS tube PB4, the grid of PMOS tube PB4 and drain electrode, NMOS tube NB1 grid and
Drain electrode connects altogether, and the source electrode of PMOS tube PB4 is connect with the output end of mirror image circuit 120.In this example, reference voltage VREFCalculating it is public
Formula is as follows:
Wherein, KPPB4For the device technology parameter of PMOS tube PB4；For the device breadth length ratio of PMOS tube PB4；VTPB4For
The device threshold voltage of PMOS tube PB4.
Reference voltage V as aboveREFCalculation formula, reference voltage VREFIt is each with the parameters of PMOS tube and NMOS tube
Item parameter is all related, so that reference voltage VREFWith the digital load circuit devcie type matching collectively formed by PMOS and NMOS,
Even if the reference voltage that reference circuit 100 provides can follow load circuit when process conditions, operating temperature change
It changes together, will not influence the performance of load circuit.
Reference circuit 100 in above-mentioned low-dropout linear voltage-regulating circuit passes through by 201 threshold voltage of the first transistor
Close to zero or the characteristic that is negative, make it possible to self-conductance and pass to form bias current Iq, mirror image electricity in the input terminal of mirror image circuit 120
It is replicated according to bias current Iq and generates reference current in road 120, it is seen that this low-dropout linear voltage-regulating circuit structure is simple, does not need
Start-up circuit, low energy consumption.And by above-mentioned each formula it is found that the reference current and base that above-mentioned low-dropout linear voltage-regulating circuit generates
Quasi- voltage is unrelated with power supply terminal VCC voltage.In addition, by control driving current controlling brancher and load current controlling brancher,
Realize that low-dropout linear voltage-regulating circuit in wide drive current range, maintains high current efficiency.
The foregoing is merely the preferred embodiments of the application, not to limit the application, all essences in the application
Made any modifications, equivalent replacements, and improvements etc., should be included within the scope of protection of this application within mind and principle.
Claims (11)
1. a kind of low-dropout linear voltage-regulating circuit characterized by comprising
Output terminal；
Power supply terminal, the power supply terminal is for accessing power supply；
Common potential terminal, the common potential terminal is for connecting common potential；
Reference circuit is connect with the power supply terminal and the common potential terminal, and the reference circuit is for generating and electricity
The unrelated reference voltage in source；
Voltage control loop is connect with the output end of the reference circuit, the power supply terminal and the common potential terminal,
The voltage control loop is set as being generated output voltage based on the reference voltage and provides the first driving current in output end
The output end of output, the voltage control loop connects the output terminal；
Driving current controlling brancher is connect with the output terminal and the power supply terminal respectively by switch, the driving electricity
Flow control branch is used to load the second driving current in the output terminal, so that the driving current of the output terminal increases；
And
Load current controlling brancher is serially connected between the output terminal and the common potential terminal by switch, described negative
Current control branch is carried to be used in the output terminal offered load electric current.
2. low-dropout linear voltage-regulating circuit as described in claim 1, which is characterized in that the driving current controlling brancher is specific
For according to loading demand, choosing whether output end load second driving current in the voltage control loop.
3. low-dropout linear voltage-regulating circuit as described in claim 1, which is characterized in that the voltage control loop includes operation
Amplifier, feedback network and the first power tube, the inverting input terminal of the operational amplifier connect the output of the reference circuit
End, the normal phase input end of the operational amplifier connect the output end of the feedback network, the control terminal of first power tube
Connecting the output end of the operational amplifier, the first conduction terminal of first power tube connects the power supply terminal, and described the
Second conduction terminal of one power tube connects the first end of the feedback network and the output end as the voltage control loop, institute
State the second termination common potential terminal of feedback network.
4. low-dropout linear voltage-regulating circuit as claimed in claim 3, which is characterized in that the driving current controlling brancher includes
First switch, second switch and the second power tube, the output end of the first end of the first switch and the operational amplifier
Connection, the control terminal of the second end of the first switch, the first end of the second switch and second power tube are mutual
Connection, the second end of the second switch connect the power supply terminal with the first conduction terminal of second power tube, and described the
Second conduction terminal of two power tubes connects the output terminal.
5. low-dropout linear voltage-regulating circuit as described in claim 1, which is characterized in that the load current controlling brancher includes
One end of third switch and current loading, the current loading connects the output terminal, the electricity by third switch
Another termination common potential terminal of current load.
6. low-dropout linear voltage-regulating circuit as claimed in claim 3, which is characterized in that the feedback network includes the first partial pressure
Module and the second division module, first end of the first end of first division module as the feedback network, described first
The first end of the second end of division module and the second division module connects altogether and the output end as the feedback network, and described second
Second end of the second end of division module as the feedback network.
7. low-dropout linear voltage-regulating circuit as claimed in claim 4, which is characterized in that first power tube and described second
Power tube is PMOS tube, and the grid of the PMOS tube, source electrode, drain electrode are led respectively as the control terminal, the first conduction terminal, second
Go side.
8. low-dropout linear voltage-regulating circuit as described in any one of claim 1 to 7, which is characterized in that the reference circuit packet
It includes:
Mirror image circuit, the power end of the mirror image circuit connect the power supply terminal, and the input terminal connection of the mirror image circuit is inclined
Set electric current；
Biasing circuit is connected between the input terminal of the mirror image circuit and the common potential terminal, the biasing circuit energy
Self-conductance passes to the input terminal in the mirror image circuit and forms the bias current；And
First load, first load are connected between the output end of the mirror image circuit and common potential terminal, the mirror
The bias current as described in current mirror simultaneously acts on first load, to generate reference voltage in output end.
9. low-dropout linear voltage-regulating circuit as claimed in claim 8, which is characterized in that the biasing circuit includes first crystal
Pipe and the second load, the first transistor are threshold voltage close to no-voltage or the Native NMOS tube of negative voltage, described the
The drain electrode of one transistor connects the input terminal of the mirror image circuit, and the source electrode of the first transistor connects second load
The substrate of first end, the second end of the second load, the grid of the first transistor and the transistor connects common electrical
Position terminal.
10. a kind of control method based on the described in any item low-dropout linear voltage-regulating circuits of claim 1 to 9, feature exist
In the control method includes two ways:
Mode one:
When load circuit switches to big power consumption mode by low-power consumption mode, the first step is controlled by controlling the load current
Branch switch, in output terminal offered load electric current；Second step is switched by controlling the driving current controlling brancher, defeated
Terminal loads the second driving current out, at this point, low-dropout linear voltage-regulating circuit work is under heavy duty mode；Third step will be born
It carries circuit and switches to big power consumption mode；
When load circuit switches to low-power consumption mode by big power consumption mode, load circuit is switched to low-power consumption mould by the first step
Formula；Second step is switched by controlling the driving current controlling brancher, the second driving current is closed in output terminal, at this point, low
Pressure difference linear voltage-stabilizing circuit works in light load mode；Third step is switched by controlling the load current controlling brancher, defeated
Terminal closes load current out；
Mode two:
When load circuit switches to big power consumption mode by low-power consumption mode, the first step is controlled by controlling the load current
Branch switch, in output terminal offered load electric current；Second step is switched by controlling the driving current controlling brancher, defeated
Terminal loads the second driving current out, at this point, low-dropout linear voltage-regulating circuit work is under heavy duty mode；Third step will be born
It carries circuit and switches to big power consumption mode；4th step is switched by controlling the load current controlling brancher, is closed in output terminal
Load current；
When load circuit switches to low-power consumption mode by big power consumption mode, the first step is controlled by controlling the load current
Branch switch, in output terminal offered load electric current；Load circuit is switched to low-power consumption mode by second step；Third step passes through
The driving current controlling brancher switch is controlled, closes the second driving current in output terminal, at this point, low pressure difference linearity pressure stabilizing electricity
Road works in light load mode；4th step is switched by controlling the load current controlling brancher, closes and load in output terminal
Electric current.
11. a kind of integrated circuit, which is characterized in that including the described in any item low pressure difference linearity pressure stabilizing electricity of claims 1 to 10
Road.
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| CN111290472A (en) * | 2020-02-25 | 2020-06-16 | 江苏润石科技有限公司 | Low dropout regulator with fast response |
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| US11528020B2 (en) | 2020-11-25 | 2022-12-13 | Changxin Memory Technologies, Inc. | Control circuit and delay circuit |
| US11550350B2 (en) | 2020-11-25 | 2023-01-10 | Changxin Memory Technologies, Inc. | Potential generating circuit, inverter, delay circuit, and logic gate circuit |
| US11681313B2 (en) | 2020-11-25 | 2023-06-20 | Changxin Memory Technologies, Inc. | Voltage generating circuit, inverter, delay circuit, and logic gate circuit |
| WO2023168850A1 (en) * | 2022-03-11 | 2023-09-14 | 长鑫存储技术有限公司 | Bias generation circuit and storage circuit |
| US11887652B2 (en) | 2020-11-25 | 2024-01-30 | Changxin Memory Technologies, Inc. | Control circuit and delay circuit |
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| US11887652B2 (en) | 2020-11-25 | 2024-01-30 | Changxin Memory Technologies, Inc. | Control circuit and delay circuit |
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