CN110196611A - A kind of low-dropout regulator and its system - Google Patents
A kind of low-dropout regulator and its system Download PDFInfo
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- CN110196611A CN110196611A CN201810749057.XA CN201810749057A CN110196611A CN 110196611 A CN110196611 A CN 110196611A CN 201810749057 A CN201810749057 A CN 201810749057A CN 110196611 A CN110196611 A CN 110196611A
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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
The invention discloses low-dropout regulator and including the system of low-dropout regulator, wherein the low-dropout regulator can include: comparison circuit is configured as comparing the signal for the output for indicating the low-dropout regulator and reference signal to generate comparison result；The comparison circuit is coupled in loop control unit, is configured as being based at least partially on the comparison result to generate output circuit control signal；And output circuit, including two or more switching circuits, it is configured as controlling signal based on the output circuit to adjust the quantity of the switching circuit of the middle conducting of the two or more switching circuits.The output of low-dropout regulator can quickly be adjusted in real time according to the variation of the output of low-dropout regulator by implementing the embodiment of the present invention.
Description
[technical field]
The present invention relates to electronic technology field more particularly to low-dropout regulator and its systems.
[background technique]
Low-dropout regulator is used for integrated circuit, as a kind of mode for adjusting output voltage.Even if being connect in output voltage
In the case where nearly supply voltage, low-dropout regulator is also often designed to generate stable output voltage.
[summary of the invention]
The present invention provides low-dropout regulator and the system including low-dropout regulator, can be quickly according to low-dropout regulator
Output variation in real time adjustment low-dropout regulator output.
A kind of low-dropout regulator generating output provided in an embodiment of the present invention can include: comparison circuit is configured as
The signal and reference signal for comparing the output for indicating the low-dropout regulator are to generate comparison result；Loop control unit, coupling
To the comparison circuit, it is configured as being based at least partially on the comparison result to generate output circuit control signal；With it is defeated
Circuit out, including two or more switching circuits are configured as controlling signal based on the output circuit to adjust described two
The quantity of the switching circuit of the middle conducting of a or more switching circuit.
A kind of system provided in an embodiment of the present invention can include: load circuit, the load circuit include multiple sub-circuits；
First low-dropout regulator is coupled to the first end of the load circuit, is configured as the first of the first low-dropout regulator
Output provides the first end for arriving the load circuit；With the second low-dropout regulator, it is coupled to the of the load circuit
Two ends are configured as providing the second output of second low-dropout regulator to the second end of load circuit；Wherein
First low-dropout regulator is configured as sending the level of instruction first output to second low-dropout regulator
First instruction of variation；Wherein, first low-dropout regulator is low-dropout regulator described in various embodiments of the present invention.
As previously mentioned, low-dropout regulator and system provided by the embodiment of the present invention can compare expression by comparing circuit
The signal and reference signal of the output of low-dropout regulator pass through loop control unit based on the comparison to generate comparison result
As a result the quantity for generating the switching circuit be connected in output circuit of the output circuit control signal to adjust low-dropout regulator, because
This, the low-dropout regulator and system of the embodiment of the present invention can be adjusted quickly according to the variation of the output of low-dropout regulator in real time
The output of low-dropout regulator, further, when low-dropout regulator connects load circuit, the embodiment of the present invention can rapidly adapt to bear
The variation of circuit impedance is carried to adjust the output of low-dropout regulator.
[Detailed description of the invention]
Fig. 1 shows the circuit board 100 including package parts 110 and package outside part 140.
Fig. 2A shows the embodiment of ILDO voltage-stablizer 200.
Fig. 2 B shows the embodiment of buffer circuit 240 and switching circuit 250.
Fig. 3 shows the ILDO voltage-stablizer 300 of another embodiment including the first branch 330 and the second branch 340.
Fig. 4 shows single branch ILDO voltage-stablizer 400 that circuit 410 is checked including timer.
Fig. 5 shows double branches ILDO voltage-stablizer 500.
Fig. 6 shows the first ILDO voltage-stablizer 620 and the 2nd ILDO voltage-stablizer including being coupled in 610 both ends of load circuit
630 system 600.
Fig. 7 shows the system with the first ILDO 620 and the 2nd ILDO 630 for being coupled in 610 both ends of load circuit
700。
[specific embodiment]
Integrated low voltage difference (Integrated Low Dropout, ILDO) voltage-stablizer may be that many integrated circuits solve
The important component of scheme.Ideally, ILDO voltage-stablizer can be keep low fluctuation and provide while low noise can be with
Close to the controllable output-voltage levels of mains voltage level.The load circuit that ILDO voltage-stablizer can be coupled according to its output end
The variation of impedance adjusts its output, so that providing in output end constant or close to constant power, voltage or electric current.But
It is that typical ILDO voltage-stablizer needs the variation of prior notice loading condition, instruction load impedance can occur in particular point in time
Variation is adjusted with providing suitable output.When load circuit needs the electric current that quickly adjustment ILDO voltage-stablizer provides, voltage or function
When rate, the ILDO voltage-stablizer with prior notice system possibly can not provide sufficient control.In addition, if prior notice signal
It loses or postpones, ILDO voltage-stablizer possibly can not provide correct output voltage, electric current or power level, and load circuit can
The voltage that can be received, electric current or power level are insufficient or excessively high.When typical ILDO voltage-stablizer would generally be synchronized to one
In the clock period, this may introduce unnecessary delay when changing provided output voltage or electric current, because of ILDO voltage-stablizer
Its output voltage is being adjusted, clock edge may be had to wait for before electric current or power level.The present invention describes to have different
The ILDO voltage-stablizer of control system is walked, it can be quickly according to the variation of the output of low-dropout regulator (for example, load circuit hinders
Anti- variation) adjustment low-dropout regulator output.
Before control system of the invention is discussed, depositing for parasitics in circuit relevant to ILDO voltage-stablizer will be discussed
?.Fig. 1 shows the circuit board 100 including package parts 110 and package outside part 140.Package parts 110 may include coupling
To integrated low voltage difference (ILDO) voltage-stablizer 120 of load circuit 130.ILDO voltage-stablizer 120 can output it be supplied to it is negative
Carry circuit 130.Package outside part 140 can have parasitic inductance, parasitic capacitance and/or dead resistance and external power supply management collection
At circuit (Power Management Integrated Circuit, PMIC).For example, encapsulation dispatch from foreign news agency sensor may be in inductance
There is parasitic capacitance between the winding turns of device.In another example, encapsulation external capacitive body may have at various frequencies and post
Raw resistance.It is posted in addition, package parts 110 and encapsulation can have with the coupling between encapsulation component by similar mechanism
Raw inductance, parasitic capacitance and/or dead resistance.As described herein any or whole ghost effect can change over time.Separately
Outside, the impedance of load circuit 130 can change over time.For example, carrying out self coupling if load circuit 130 is coupled to another circuit
The reflected umpedance of conjunction can change over time, to change the impedance for the load circuit 130 seen by ILDO voltage-stablizer 120.Another
In one example, the impedance 130 of load circuit can change due to the time-varying ghost effect in load circuit 130.In some realities
It applies in example, ILDO voltage-stablizer 120 can be designed to provide power, electricity to load circuit 130 in a manner of mitigating ghost effect
The variation of pressure or electric current output and load impedance.It should be understood that package outside part 140 shown in Fig. 1 is only example,
And package outside part in some embodiments, can not used.In some embodiments, in addition to ILDO voltage-stablizer 120 and negative
It carries except circuit 130, does not use on piece package parts.
Load circuit 130 can be from ILDO voltage-stablizer 120 and receive power, any circuit of current or voltage.Due to being permitted
Multifactor, the impedance of load circuit 130 can change with the time, the variation for the size that the factor such as loads or parasitism
The variation of phenomenon.Therefore, as will be described in further detail below, in some embodiments, ILDO voltage-stablizer 120 can fit
Answer the impedance variations of load circuit and the ghost effect of package parts 110 and the outer component 140 of encapsulation.
Fig. 2A shows the embodiment of ILDO voltage-stablizer 200.ILDO voltage-stablizer 200 may include control circuit 260 and open
Powered-down road 250.Control circuit 260 can receive feedback signal VFB and reference signal VREF1 at comparator 210.VFB can be with
It is to indicate the signal of the voltage level at the output of ILDO voltage-stablizer 200 (that is, VFB can reflect the impedance of load circuit
Variation).For example, in some embodiments, VFB can be the output voltage of ILDO voltage-stablizer 200.In other embodiments, VFB
The ratio that can be the output voltage of ILDO voltage-stablizer 200 indicates.In other embodiments, it is supplied to the feedback of comparator 210
Signal can indicate the electric current or power that are supplied to load circuit.VREF1 can be reference voltage, can be set in advance in and is
In the memory of system, established by the user setting of system, or by any suitable means.In other embodiments, it refers to
Signal can be reference current or power.Comparator 210 may compare feedback signal and reference signal and export two signals of instruction
Between state change COMP signal.For example, if VFB is initially less than VREF1 and then becomes to be above VREF1, comparator
210 can be generated the first COMP signal that instruction VFB state changes.Optionally, if VFB is initially higher than VREF1 and then becomes
Lower than VREF1, then the 2nd COMP signal can be generated in comparator 210, and the 2nd COMP signal designation and the first COMP signal are not
The change of same VFB state.For example, the first COMP signal can be with first shape, the first duration and/or the first width
The pulse of degree, and the 2nd COMP signal can be with the second shape, the pulse of the second duration and/or the second amplitude.?
In some embodiments, the first COMP signal and the 2nd COMP signal can be different and can different shapes with VFB relative to VREF1
State changes (for example, VFB, which drops to or VFB lower than VREF1, rises to VREF1 or more).Although being compared here using voltage as showing
Example, it is to be understood that comparison other can be electric current or power in specific implementation.Variation of the VFB relative to the level of VREF1
(for example, VFB, which drops to or VFB lower than VREF1, rises to VREF1 or more) is determined for being provided by ILDO voltage-stablizer 200
To the variation of the level of the output voltage of load circuit.Therefore, its adjustable output voltage of ILDO voltage-stablizer 200 is to compensate
Level change of the VFB relative to VREF1.
The output COMP of comparator 210 can be sent to pulse generator 220.The COMP of output can make pulse produce
Raw device 220 generates the pulse that can be sent to loop control unit 230.Pulse generator 220 can be suitable for generating and indicate
The signal changed by the state that comparator 210 detects.In some embodiments, if the output COMP of comparator 210 is indicated
It is higher than VREF1 that VFB, which has changed state, then the pulse of the first kind can be generated in pulse generator 220, if comparator
It is lower than VREF1 that 210 output COMP instruction VFB, which has changed state, and the arteries and veins of Second Type can be generated in pulse generator 220
Punching.In some embodiments, pulse generator 220 can generate phase for any state change detected by comparator 210
Same pulse.In such embodiments, comparator 210 can be connected to loop control unit 230 and pulse generator simultaneously
220, so that when loop control unit 230 receives pulse from pulse generator 220, it, which can receive, is generated by comparator 210
COMP signal is to indicate variation of the VFB relative to the level of VREF1 (that is, VFB becomes to be above VREF1, alternatively, VFB becomes low
In VREF1).It should be understood that in some embodiments, pulse generator 220, the output of comparator 210 can not used
It can be for delivery to loop control unit 230.In such embodiments, it such as will be described in further detail below, the level of COMP signal
It can indicate level of the VFB relative to VREF1, and loop control unit 230 is according to the change of the state of the COMP signal, and lead to
It crosses using the level of the COMP signal and determines the quantity of enabled or forbidden energy switch in switching circuit 250.
Loop control unit 230 can receive signal PULSE from pulse generator 220 and/or from comparator 210
Signal COMP, and determine the quantity of enabled or forbidden energy switch in switching circuit 250.In loop control unit 230 only from pulse
Generator 220 receives in some embodiments of signal PULSE, and signal PULSE can correspond to the shape of the COMP of the output of comparator 210
State.When COMP is in the first level, PULSE can correspond to the first pulse shape, the first amplitude and/or the first duration, when
COMP is in second electrical level, and PULSE can correspond to the second pulse shape, the second amplitude and/or the second duration.It is controlled in circuit
Device processed receives in some embodiments of both signal PULSE and COMP, and the level regardless of COMP, PULSE can be phase
Same pulse shape, and loop control unit 230 can adjust switching circuit based on the level of COMP when receiving signal PULSE
The quantity of enabled switch in 250.COMP is received in loop control unit 230 in some embodiments of PULSE, works as signal
Enabled number of switches when COMP changes level, in the adjustable switching circuit 250 of loop control unit 230.Switching circuit 250
In enabled switch quantity can correspond to ILDO voltage-stablizer 200 output voltage VO UT level.For example, if circuit is controlled
Device 230 processed receives feedback voltage V FB relative to the lower instruction of VREF1, then loop control unit 230 can produce signal to increase
The quantity of the switch enabled in switching circuit 250, to increase the output voltage of ILDO voltage-stablizer 200.In such an example,
If 5 switches are currently enabled in switching circuit 250, and loop control unit 230 receive and indicate VFB relative to
VREF1 be it is low, then loop control unit 230 can produce signal to enable in switching circuit 250 the 6th switch.Alternatively, circuit is controlled
Device 230 processed can receive the instruction of the size about the difference between instruction VFB and VREF1, and can be in switching circuit 250
Enable the switch of proportional quantity.In another example, if loop control unit 230 receives indication feedback voltage VFB phase
When for VREF1 higher, loop control unit 230 can produce signal with the extra switch in forbidden energy switching circuit 250, to reduce
The output voltage of ILDO voltage-stablizer 200.In fig. 2, N number of switch is shown in switching circuit 250, wherein N is greater than 1
Any positive integer.Loop control unit 230 can be the quantity for the switch being adapted to determine that in switching circuit 250 and generate signal with
Enable any controller of these switches, such as field programmable gate array (FPGA), microprocessor or hardware logic electric circuit.
Signal from loop control unit 230 can pass through optional buffer circuit before reaching switching circuit 250
240.Buffer circuit 240 may include N number of buffer amplifier, and each buffer amplifier is connected to switch from loop control unit 230
Circuit 250 to inductive switch.Therefore, each buffer amplifier of buffer circuit 240 can be in loop control unit 230 and switch electricity
Individual signal path is provided between each switch on road 250.Buffer circuit 240 is adjustable by the defeated of loop control unit 230
The impedance level seen out with the input of switching circuit 250, with the switch of driving switch circuit 250.
Switching circuit 250 may include the N number of switch controlled by loop control unit 230, and N number of switch is for providing height
Conducting path between the output VOUT of reference voltage VIN and ILDO voltage-stablizer 200.High reference voltage VIN can be by any
Known voltage source provides, such as power supply or battery.As shown in Figure 1, the output VOUT of ILDO voltage-stablizer 200 may be coupled to load
Circuit.
Fig. 2 B shows the embodiment of buffer circuit 240 and switching circuit 250.In this example, N is equal to 3, but N can be used
It is any be greater than or equal to 2 positive integer.Loop control unit 230 provides three output signals, each is in switching circuit 250
Each switch.Output signal from loop control unit 230 the switch for being connected to switching circuit 250 control terminal (for example,
Grid) it before can be by the buffer amplifier in buffer circuit 240.Switch in switching circuit 250 can be connected in parallel, and make
(turn on) more Multi- Switch must be connected to generate higher output voltage or electric current at VOUT, and turn off (turn off)
More switches to generate lower output voltage or electric current in VOUT.It should be understood that shown in buffer amplifier and
The configuration of switch connection is only an example, the switch for allowing to come using loop control unit 230 in control switch circuit 250
Any suitable embodiment can be implemented in the present invention.
In some embodiments, it may be desired to provide multiple reference voltages so that loop control unit it is adjustable with it is multiple
The relevant output voltage of reference voltage.Such embodiment can permit output voltage and be maintained at true by multiple reference voltage levels
Within the scope of fixed one or in multiple ranges.Fig. 3 is shown to be implemented including another of the first branch 330 and the second branch 340
The ILDO voltage-stablizer 300 of example.Second branch 340 of ILDO voltage-stablizer 300 may include that the second comparator 310 and the second pulse produce
Raw device 320.Second comparator 310 can receive the feedback voltage V FB and the second reference voltage VREF2 as input signal.
VREF2 and VREF1 is same or different reference voltage.Comparator 310 may compare VFB and VREF2, and pass through signal
COMP2 indicates the state change between two signals.For example, if VFB is initially less than VREF2 and then becomes to be above
VREF2, then the signal COMP2 of instruction state change can be generated in comparator 310.Alternatively, if VFB is initially higher than VREF2 simultaneously
And then getting lower than VREF2, then comparator 310 can be generated the signal COMP2 of instruction state change (VFB be from lower than VREF2
It is changed to above COMP2 and VFB caused by VREF2 and becomes less than COMP2 caused by VREF2 from VREF2 is higher than and may have
Different duration, amplitude etc.).The output COMP2 of comparator 310 can reach pulse generator 320 or loop control unit
230。
The state change for being detected and being exported by comparator 310 can make pulse generator 320 generate pulse PULSE2, should
Pulse PULSE2 can be sent to loop control unit 230.Pulse generator 320, which can be to be suitable for generating, indicates comparator 310
Any circuit for the signal that detected state changes.In some embodiments, if comparator 310 detects VFB
Change state is higher than VREF2, then the pulse of the first kind can be generated in pulse generator 320, and if comparator 310 is examined
Measuring VFB to change state is lower than VREF2, then the pulse of Second Type can be generated in pulse generator 320.In some embodiments
In, pulse generator 320 can periodically generate pulse or signal PULSE2, except non-comparator 310 detect VFB relative to
The state of VREF2 changes.In some embodiments, pulse generator 320 can be for the state detected by comparator 310
Any change generates identical pulse.It should be appreciated that in some embodiments, pulse generator 320 can not used, and compare
Output COMP2 compared with device 310 can be for delivery to loop control unit 230.In some embodiments, pulse generator can be used
320, and the output COMP2 of comparator 310 can also be for delivery to loop control unit 230.In such embodiments, if inspection
It measures two states to change, then the output combination pulse generator 220 of comparator 210 and 310 can be used in loop control unit 230
Output with 320 determines the priority of controller.For example, if VFB begins lower than VREF1 and VREF2, but then rapidly on
Rise with more than VREF1 and VREF2, in this example, VREF2 > VREF1, loop control unit 230 can determine it should handle by
The event that second branch 340 generates, i.e. event on the second comparator 310 and the second pulse generator 320, because being based on two
Relationship between reference voltage, the event handled in the second branch 340 will inherently meet the event in the first branch 330.
Although showing Liang Ge branch 330 and 340 in Fig. 3, each branch is as reception instruction output voltage or reference
The signal chains of the signal of voltage, and loop control unit 230 is transmitted to for generating event detection signal, it is to be appreciated that this hair
It is bright to can use any number of branch.The signal for indicating the output voltage can be to have scaling with the output voltage
Or voltage or current signal without scaling.It is, for example, possible to use tool, there are three three branches of reference voltage, or
Tool can be used in person, and there are four four branches of reference voltage.In addition, if using suitable comparator, single branch can be with
Use multiple reference voltages.It should be understood that in some embodiments, single comparator can be with two reference voltages
VREF1 is used together with VREF2, without the use of two comparators.The output of comparator can be instruction VFB and join compared to two
Tri-state (tristate) signal or comparator for examining the level of voltage can have two outputs, and each output indicates VFB phase
Compared with the level of one of them in two references.
There are two the ILDO voltage-stablizers 300 of branch can be used for monitoring output voltage VO UT and hold it in predetermined threshold for tool
It is interior.For example, VREF1 can be set to lower voltage limit, and VREF2 can be set to upper limit voltage.If regulation is being
The VOUT that should be between VREF1 and VREF2 during system operation increases due to various ghost effects or load effect, so that
VFB is more than upper limit voltage VREF2, then comparator 310 is by trigger event, and sends the change of instruction state to loop control unit
230 and/or pulse generator 320.If comparator 310 sends signal to pulse generator 320, pulse generator 320 will
It subsequently generates and sends the pulse for corresponding to the change of state of the comparator to the loop control unit 230.Loop control unit 230
By the quantity of the subsequent switch for reducing and being connected in switching circuit 250 to reduce output voltage VO UT.The quantity of deactivated switch can
To be fixed amount (for example, loop control unit is directed to one additional switch of each event forbidden energy), or can be proportional
Amount (for example, loop control unit forbidden energy and VOUT compared to the difference of reference voltage (that is, amount VOUT bigger than reference voltage) at
The multiple switch of ratio).If VOUT declines due to various ghost effects or load effect, so that VFB rations the power supply under dropping to
VREF1 is pressed hereinafter, then comparator 210 is indicated by trigger event, and to loop control unit 230 and/or the transmission of pulse generator 220
The signal that state changes.If comparator 210 sends signal to pulse generator 220, pulse generator 220 will then be generated
The pulse of state change corresponding to comparator 210 simultaneously sends it to loop control unit 230.Loop control unit 230 will be subsequent
Increase the quantity of the switch of the conducting in switching circuit 250 to increase output voltage VO UT.The quantity of switch switched on can be with
It is fixed amount (for example, loop control unit is that each event enables an additional switch), or can be proportional amount
(for example, loop control unit forbidden energy is proportional compared to the difference of reference voltage (that is, amount VOUT smaller than reference voltage) to VOUT
Multiple switch).
In some embodiments, it may be desired to control output voltage relative to time reference.If output voltage is kept
It is longer than the reference time in the time of a fixed level, then may needs to adjust output-voltage levels to provide to output voltage
The accurate control of level.Such as, if it is desired to output-voltage levels be 0.70V, and output-voltage levels are maintained at 0.69V
Time be longer than scheduled time quantum, even if then it may be desirable to increase the obtained level of output-voltage levels be higher than 0.70V, this
Sample for a period of time in average output voltage close to 0.70V.
Fig. 4 shows single branch ILDO voltage-stablizer 400 that circuit 410 is checked including timer.Timer checks circuit 410
It may include time comparison circuitry and running timer.In some embodiments, running timer can check electricity with timer
Road 410 separates, and timer checks that circuit 410 can receive timing signal from running timer.When comparator 210 is based on instead
The comparatively detection of feedthrough voltage VFB and reference voltage VREF1 are to event (that is, feedback voltage V FB and reference voltage VREF1
Relative value changes, for example, VFB is changed to above VREF1 or VFB and becomes less than from higher than VREF1 from lower than VREF1
When VREF1), (wherein, comparator 210 can check circuit 410 and pulse generator 220 and loop control unit 230 to timer
Pulse generator 220 and loop control unit 230 at least select one) send instruction event signal.Timer checks circuit 410
The value and threshold time T1 of the running timer when receiving from the event of comparator 210 can be compared, if operation meter
When device value be greater than threshold time T1, then it represents that output voltage VO UT is maintained at the overlong time of single undesirable level, then
Timer checks that circuit 410 can trigger the quantity that loop control unit 230 correspondingly adjusts the switch of conducting in switching circuit 250
(for example, when comparator true 210 detects that feedback voltage V FB becomes higher than reference voltage VREF1 from lower than reference voltage VREF1,
And the value of running timer is greater than threshold time T1, then timer checks that circuit 410 can trigger loop control unit 230 and correspondingly drop
The quantity of the switch of conducting in low switch circuit 250；On the contrary, when comparator true 210 detects feedback voltage V FB from than reference
Voltage VREF1 high becomes lower than reference voltage VREF1, and the value of running timer is greater than threshold time T1, then timer inspection
Circuit 410 can trigger the quantity that loop control unit 230 correspondingly increases the switch of conducting in switching circuit 250；).In this reality
It applies in example, whenever switching circuit 250 adjusts its internal conducting according to the value of running timer and the comparison result of threshold time T1
Switch quantity after, or after timer checks that circuit 410 compares value and the threshold time T1 of running timer, timing
Device checks that the running timer in circuit 410 can be reset；Or when changing the comparison result of comparison circuit, timing
Device checks that the running timer in circuit 410 can be reset.Running timer can be any suitable timing circuit, such as shake
Swing device, clock input or counter.Threshold time can be preset time with the movement of regulating loop controller 230.In addition, meter
When device check circuit 410 can with or optionally from comparator 210 or directly receive feedback electricity from the input of ILDO voltage-stablizer 400
Press VFB.Therefore, if the time that timer checks that circuit 410 detects that VFB is in constant unexpected level is more than threshold value
T1, then timer checks that circuit 410 can trigger the switch for the conducting that loop control unit 230 correspondingly adjusts in switching circuit 250
Quantity, even if comparator do not cause event (for example, if timer check circuit 410 detect that VFB is in constant mistake
The time of low voltage level is more than T1, then can trigger loop control unit 230 and correspondingly increase the conducting in switching circuit 250
The quantity of switch；On the contrary, if timer checks that circuit 410 detects that VFB is in the time of constant excessively high voltage level
More than T1, then it can trigger the quantity that loop control unit 230 correspondingly reduces the switch of the conducting in switching circuit 250；).It is based on
The control of time can be to the output voltage VO UT progress finer control for allowing system, specific practice are as follows: pass through first
Using the output voltage VO UT is changed based on the voltage level of comparison, it is then based on timer control at any time again
Adjust the voltage level of the output voltage VO UT.Therefore, in embodiments of the present invention, timer checks that circuit can be used for preventing
Only output voltage VO UT is maintained at single undesirable level and is longer than the determining period.For example, output voltage is in a short time
Slightly above or below desired output voltage is acceptable, but output voltage is maintained at this higher or lower than desired water
Flat voltage level is undesirable.
Fig. 5 shows double branches ILDO voltage-stablizer 500, wherein there is timer to check circuit for each branch.Wherein, it wraps
Include comparator 210, timer checks the work of circuit 410, pulse-generating circuit 220 and the first branch of loop control unit 230
Principle is identical as Fig. 4, herein without repeating.The present embodiment, which is only discussed, checks circuit 510, arteries and veins including comparator 310, timer
The working principle of the second branch of generation circuit 320 and loop control unit 230 is rushed, specifically, when comparator 310 is based on feedback
The comparatively detection of voltage VFB and reference voltage VREF2 are to event (that is, the phase of feedback voltage V FB and reference voltage VREF2
Change to value, for example, VFB from lower than VREF2 be changed to above VREF2 or VFB from be higher than VREF2 become less than VREF2)
When, comparator can send the signal for the event that indicates to timer and check circuit 510 and pulse generator 320 and circuit control
Device 230 (wherein, at least one transmission can be selected in pulse generator 320 and loop control unit 230) processed.Timer checks electricity
The value of running timer when event from comparator 310 can be received by road 510 is compared with threshold time T2, such as
The value of fruit running timer is greater than threshold time T2, then it represents that output voltage VO UT is maintained at the time of single undesirable level
Too long, then timer checks that circuit 510 can trigger loop control unit 230 and correspondingly adjust opening for conducting in switching circuit 250
The quantity of pass is (for example, when comparator true 310 detects that feedback voltage V FB becomes comparing reference voltage from lower than reference voltage VREF2
VREF2 high, and the value of running timer is greater than threshold time T2, then timer checks that circuit 510 can trigger loop control unit 230
Accordingly decrease the quantity of the switch of the conducting in switching circuit 250；On the contrary, when comparator true 310 detects feedback voltage V FB
Become lower than reference voltage VREF2 from higher than reference voltage VREF2, and the value of running timer is greater than threshold time T2, then counts
When device check that circuit 510 can trigger the number that loop control unit 230 correspondingly increases the switch of conducting in switching circuit 250
Amount；).In the present embodiment, whenever switching circuit 250 is adjusted according to the value of running timer and the comparison result of threshold time T2
After the quantity of its internal switch be connected, or when timer checks that circuit 510 compares the value and threshold value of running timer
Between after T2, timer checks that the running timer in circuit 510 can be reset.Running timer can be any suitable timing
Mechanism, such as oscillator, clock input or counter.As described above, threshold time can be preset time with regulating loop control
The movement that device 230 processed is taken.In addition, timer checks that circuit 510 can also or optionally receive feedback electricity from comparator 310
VFB is pressed, or directly receives feedback voltage V FB from the input of ILDO voltage-stablizer 500.Therefore, if timer checks circuit 510
The time for detecting that VFB is in constant unexpected level is more than threshold value T2, then timer checks that circuit 510 can trigger circuit
Controller 230 correspondingly adjusts the quantity of the switch of the conducting in switching circuit 250, even if comparator does not cause event (example
Such as, it if the time that timer checks that circuit 510 detects that VFB is in constant too low voltage level is more than T2, can touch
Hair loop control unit 230 correspondingly increases the quantity of the switch of the conducting in switching circuit 250；On the contrary, if timer inspection
The time that circuit 510 detects that VFB is in constant excessively high voltage level is more than T2, then can trigger 230 phase of loop control unit
Reduce the quantity of the switch of the conducting in switching circuit 250 with answering；) however, checked in circuit in multiple timers, it can be set
Multiple timers check that the movement that regulating loop controller 230 is taken is carried out at the interval of circuit.For example, if T1 is less than T2,
In the case where running timer reaches T1 and VOUT is in undesirable horizontal, loop control unit 230 can be by conducting
The quantity of switch is set as the first configuration.If running timer reaches the time between T1 and T2 and VOUT is in undesirable
Level, then loop control unit 230 can set the second configuration for the quantity of the switch of conducting.Although being shown in FIG. 5
Two sseparated timers check circuit 410 and 510.It should be understood that two timers check that circuit can be implemented as having
There is the single timer of multiple inputs and threshold value to check circuit.Although also, it should be understood that showing two points in Fig. 5
Branch.Any amount of branch can be used and timer checks circuit to provide the finer control to output voltage VO UT.
In addition, in another embodiment, there are two the ILDO voltage-stablizers 500 of branch can be used for monitoring output voltage VO UT for tool
And it holds it in predetermined threshold.For example, VREF1 can be set to lower voltage limit, and VREF2 can be set to
Voltage limit.If regulation should be at the VOUT between VREF1 and VREF2 due to various ghost effects or be born during system operatio
It carries effect and increases, so that VFB is lower than lower voltage limit VREF1, then comparator 210 is by trigger event, and sends instruction state
Change to timer and checks that circuit 410 and loop control unit 230 and pulse generator 220 (wherein, pulse generator 220 and return
Road controller 230 at least selects one).Timer checks when the event from comparator 210 can be received by circuit 410
The value of running timer is compared with threshold time T1, if the value of running timer is greater than threshold time T1, then it represents that defeated
Voltage VOUT is maintained at the overlong time of certain undesirable level lower than VREF1 out, then timer checks that circuit 410 can trigger
Loop control unit 230 correspondingly increases the quantity of the switch of the conducting in switching circuit 250.In the present embodiment, whenever switch
After circuit 250 adjusts the quantity of its internal switch be connected according to the value of running timer and the comparison result of threshold time T1,
Or after timer checks that circuit 410 compares value and the threshold time T1 of running timer, timer checks circuit 410
In running timer can be reset.If regulation should be at during system operatio VOUT between VREF1 and VREF2 due to
Various ghost effects or load effect and increase so that VFB is more than upper limit voltage VREF2, then comparator 310 is by trigger event,
And change to the timer for sending instruction state checks circuit 510 and 320 (wherein, arteries and veins of loop control unit 230 and pulse generator
It rushes generator 320 and loop control unit 230 and at least selects one).Timer checks that circuit 510 can will come from comparator 310
The value of running timer of event when being received be compared with threshold time T2, if the value of running timer is greater than threshold value
Time T2, then it represents that output voltage VO UT is maintained at the overlong time of certain undesirable level greater than VREF2, then timer is examined
Looking into circuit 510 can trigger the quantity that loop control unit 230 accordingly decreases the switch of conducting in switching circuit 250.In this reality
It applies in example, whenever switching circuit 250 adjusts its internal conducting according to the value of running timer and the comparison result of threshold time T2
Switch quantity after, or after timer checks that circuit 510 compares value and the threshold time T2 of running timer, meter
When device check circuit 510 in running timer can be reset.In the specific implementation, threshold time T1 and T2 can be identical or not
Together.
In some embodiments, the load circuit at the output of ILDO voltage-stablizer may include reticulation circuit.In this feelings
Under condition, one end that the output of ILDO voltage-stablizer is supplied to reticulation circuit may cause to the power at load circuit both ends, voltage or
Current distribution is uneven is even.Described herein is a kind of system with multiple ILDO voltage-stablizers, in the multiple of load circuit
Point place offer power, voltage or electric current, wherein ILDO voltage-stablizer can communicate stability to keep system or with other
Mode improves the control to system.
Fig. 6 shows the first ILDO voltage-stablizer 620 and the 2nd ILDO voltage-stablizer including being coupled in 610 both ends of load circuit
630 system 600.In the embodiment that load circuit 610 is equivalent to resistance grids, if using single ILDO voltage-stablizer and incited somebody to action
Its side for being connected to load circuit 610, it is uneven on load circuit 610 that grid may cause the voltage from ILDO voltage-stablizer
It dissipates evenly, leads to invalid operation and high power loss.Therefore, system 600 uses first on the first side of load circuit 610
ILDO voltage-stablizer 620, and the 2nd ILDO voltage-stablizer 630 is used in second side of load circuit 610.By in load circuit
Equal voltage is provided on 610 separation side, the voltage dissipation across grid can reduce, and function more evenly may be implemented
Consumption.However, if the first ILDO voltage-stablizer 620 and the 2nd ILDO voltage-stablizer 630 independently provide voltage to grid, if defeated
Voltage is not adjusted in a synchronous manner out, then output voltage may inhibit each other.
Fig. 7 shows the system with the first ILDO 620 and the 2nd ILDO 630 for being coupled in 610 both ends of load circuit
700.Load circuit 610 include arrangement in the mesh network N number of sub-circuit (with the quantity of the switch in ILDO switching circuit without
Close), wherein N is greater than or equal to 1 positive integer.Each sub-circuit 710,720 and 730, which can serve as, is coupled to the first ILDO
620 and the 2nd ILDO 630 load circuit 610 in sub-circuit, but if the first ILDO voltage-stablizer 620 and the 2nd ILDO
630 independent operation of voltage-stablizer, the resistance value between each sub-circuit 710,720 and 730 may cause these sub-circuit both ends not
Uniform power consumption.Therefore, the first ILDO voltage-stablizer 620 and the 2nd ILDO voltage-stablizer 630 can be exchanged by communication channel
Control signal.For example, the loop control unit of the first ILDO voltage-stablizer 620 can receive from second in unidirectional embodiment
The comparator of ILDO voltage-stablizer 630, pulse generator and/or timer check the signal of circuit.Therefore, if the 2nd ILDO is steady
Depressor 630 is detected not to be occurred in the event in second side of load circuit 610 on the first side of load circuit 610, then may be used
Notify the first ILDO voltage-stablizer 620, and the quantity of the switch of the changeable conducting of loop control unit of the first ILDO voltage-stablizer 620
To adjust the output voltage of the first ILDO voltage-stablizer 620 and prevent the uneven voltage by being applied to load circuit 610 from occurring
Damping effect.In another two-way embodiment, both ILDO 620 and 630 can check circuit based on their timer,
Pulse generator and/or comparator transmit event information each other, to keep the synchronizing voltage to load circuit 610 to export.Though
Two ILDO are so shown in figure 6 and figure 7, it should be appreciated that any amount of ILDO can be applied to load circuit simultaneously
It is synchronized.
For this purpose, disclosed herein data structure and mentioned code can entirely or partly be stored in a calculating
In machine readable storage medium storing program for executing, hardware module or hardware device.The computer readable storage medium includes, but are not limited to volatile
Property memory, nonvolatile memory, magnetically or optically store equipment (for example, hard disk, tape, CD-ROM device, digital light disc player),
Either other media of capable store code and/or data that are currently known or developing in the future.Disclosed herein
Hardware module or hardware device include, but are not limited to specific integrated circuit (Application-Specific Integrated
Circuits, ASICs), it is field programmable gate array (Field-Programmable Gate Arrays, FPGAs), dedicated
Or shared processor and other hardware modules or device currently known or develop in the future.
Although the embodiment of the present invention is described by a part of the embodiment, the invention is not limited to as described herein
Particular form.Precisely, the scope of the present invention is only limited by corresponding claim.In addition, although a feature may
It is only described In a particular embodiment, however those skilled in the art are it is recognised that the reference present invention, described implementation
Multiple features in example can be combined.In the claims, term " comprising " is not precluded from the presence of other elements or step.
Further, although single feature may include in different claims, these features can be advantageous as best one can
Ground combines, and includes that the combination being not offered as between feature in different claims is infeasible and/or is unfavorable
's.In addition, including that feature in a type of claim is not offered as being limited in such, on the contrary, indicating basis
Actual conditions, these features can also be equally applicable to other kinds of claim.
To " first " of modified elements, " second " in claims, the ordinal numbers such as " third " it is not dark using itself
Show the chronological order of any priority, order of priority, the precedence between each element or performed method, and is used only as marking
Know to distinguish the different elements with same names (with different ordinal numbers).
Some vocabulary is used in the specification and claims to censure specific component.Those skilled in the art answer
It is understood that hardware manufacturer may call the same component with different nouns.This specification and claims not with
The difference of title is as the mode for distinguishing component, but with the difference of component functionally as the criterion of differentiation.Logical
The "comprising" and " comprising " of specification and claim mentioned in are an open term, thus should be construed to " include
But it is not limited to "." generally " refer within an acceptable error range, those skilled in the art can be in certain error range
Interior solution the technical problem, basically reaches the technical effect.In addition, " coupling " word includes any directly and indirect herein
Means of electrical connection.Therefore, if it is described herein that a first device is coupled to a second device, then representing the first device can be straight
It connects and is electrically connected at the second device, or be electrically connected to the second device indirectly by other devices or connection means.With
The lower preferred mode of the invention for implementation, it is therefore intended that illustrate spirit of the invention rather than to limit protection of the invention
Range, protection scope of the present invention is subject to view appended claims institute defender.
Though the present invention is disclosed above in the preferred embodiment, the range that however, it is not to limit the invention, any this field
Technical staff, without departing from the spirit and scope of the present invention, when can do a little change and retouching, therefore protection of the invention
Range is subject to view as defined in claim.
Claims (23)
1. a kind of low-dropout regulator for generating output characterized by comprising
Comparison circuit is configured as comparing the signal for the output for indicating the low-dropout regulator and reference signal is compared with generating
As a result；
The comparison circuit is coupled in loop control unit, is configured as being based at least partially on the comparison result defeated to generate
Circuit control signal out；With
Output circuit, including two or more switching circuits are configured as controlling signal based on the output circuit to adjust
The quantity of the switching circuit of the middle conducting of the two or more switching circuits.
2. low-dropout regulator according to claim 1, which is characterized in that the comparison circuit passes through pulse generator coupling
The loop control unit is closed, the pulse generator is configured as generating pulse according to the variation of the comparison result.
3. low-dropout regulator according to claim 2, which is characterized in that the loop control unit is configured as based on institute
It states pulse and generates the output circuit control signal.
4. low-dropout regulator according to claim 1, which is characterized in that further include be coupled in the loop control unit and
Two or more buffer amplifiers between the output circuit.
5. low-dropout regulator according to claim 2, which is characterized in that the pulse generator is configured as described
Output generates the pulse of the first kind when being greater than the reference signal, generate second when the output is less than the reference signal
The pulse of type.
6. low-dropout regulator according to claim 1, which is characterized in that the loop control unit is configured as when described
At least one switching circuit enabled in the two or more switching circuits is generated when output is less than the reference signal
Output circuit controls signal.
7. low-dropout regulator according to claim 1, which is characterized in that the loop control unit is configured as when described
Output generates at least one switching circuit in the two or more switching circuits of forbidden energy when being greater than the reference signal
Output circuit controls signal.
8. low-dropout regulator according to claim 1, which is characterized in that further include:
Timer checks circuit, is configured as changing the comparison result when the variation of the comparison result of the comparison circuit
When running timer runing time be compared with the first reference time with generation time check signal.
9. low-dropout regulator according to claim 8, which is characterized in that the loop control unit is further configured to
The output circuit is generated based on the time check signal and controls signal, wherein transporting described in the time check signal designation
When the row time is more than first reference time, the output circuit control signal is generated.
10. low-dropout regulator according to claim 8 or claim 9, which is characterized in that the runing time is in the output electricity
It is reset after the quantity of the switching circuit of road adjustment conducting.
11. low-dropout regulator according to claim 8 or claim 9, which is characterized in that the runing time is in the timer
It checks and is reset after the runing time is compared by circuit with the first reference time.
12. low-dropout regulator according to claim 8 or claim 9, which is characterized in that the runing time is electric in the comparison
It is reset when the comparison result on road changes.
13. low-dropout regulator according to claim 1, which is characterized in that the comparison circuit is the first comparison circuit,
The reference signal is the first reference signal, and the comparison result that the comparison circuit generates is the first comparison result, described
Low-dropout regulator further include:
Second comparison circuit, be configured as comparing the signal for the output for indicating the low-dropout regulator and the second reference signal with
Generate the second comparison result, wherein the loop control unit be further coupled to second comparison circuit and be configured as to
First comparison result and second comparison result are at least partly based on to generate the output circuit control signal.
14. low-dropout regulator according to claim 13, which is characterized in that further include:
The second pulse generator being coupled between second comparison circuit and the pulse generator, second pulse produce
Raw device is configured as generating the second pulse according to the variation of second comparison result.
15. low-dropout regulator according to claim 13, which is characterized in that further include:
First timer checks circuit, is configured as when the variation of the comparison result of first comparison circuit, by described first
When the first runing time of the first running timer is compared with the first reference time to generate first when comparison result changes
Between check signal；
Second timer checks circuit, is configured as when the variation of the comparison result of second comparison circuit, by described the
The second runing time of the second running timer was compared to generate second with the second reference time when two comparison results change
Time check signal.
16. low-dropout regulator according to claim 15, which is characterized in that the loop control unit is further configured
To check that signal and/or the second time check signal generate the output circuit and control signal based on the first time；
Wherein when the first time checking that the first runing time described in signal designation is more than first reference time, it is based on
First comparison result controls signal to generate output circuit；
When wherein the second runing time described in the second time check signal designation is more than second reference time, it is based on
Second comparison result controls signal to generate output circuit.
17. low-dropout regulator according to claim 15 or 16, which is characterized in that first runing time and described
Second runing time is reset after the quantity of the switching circuit of output circuit adjustment conducting.
18. low-dropout regulator according to claim 16 or 17, which is characterized in that first runing time is described
First timer checks to be reset after first runing time is compared by circuit with the first reference time；Second fortune
The row time is answered after second timer checks that second runing time is compared by circuit with the second reference time
Position.
19. low-dropout regulator according to claim 13, which is characterized in that the loop control unit is configured as working as institute
At least one enabled in the two or more switching circuits is generated when stating the signal of output less than first reference signal
The output circuit of a switching circuit controls signal, and taboo is generated when the signal of the output is greater than second reference signal
The output circuit of at least one switching circuit in the two or more switching circuits of energy controls signal.
20. a kind of system characterized by comprising
Load circuit, the load circuit include multiple sub-circuits；
First low-dropout regulator is coupled to the first end of the load circuit, is configured as the first low-dropout regulator
First output provides the first end for arriving the load circuit；With
Second low-dropout regulator is coupled to the second end of the load circuit, is configured as the second low voltage difference pressure stabilizing
Second output of device provides the second end for arriving load circuit；
Wherein first low-dropout regulator, which is configured as sending to second low-dropout regulator, indicates that described first is defeated
First instruction of level change out；
Wherein, first low-dropout regulator is the low-dropout regulator as described in any one of claim 1-19.
21. system according to claim 20, which is characterized in that second low-dropout regulator is configured to based on institute
It states the first instruction and second output is provided.
22. system according to claim 20, which is characterized in that second low-dropout regulator is configured as to described
First low-dropout regulator sends the second instruction of the level change for indicating second output voltage, wherein second low pressure
Poor voltage-stablizer is the low-dropout regulator as described in any one of claim 1-18.
23. system according to claim 22, which is characterized in that first low-dropout regulator is configured to based on institute
It states the second instruction and first output is provided.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US15/907,225 | 2018-02-27 | ||
| US15/907,225 US10326361B2 (en) | 2017-03-08 | 2018-02-27 | Asynchronous low dropout regulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110196611A true CN110196611A (en) | 2019-09-03 |
| CN110196611B CN110196611B (en) | 2021-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810749057.XA Active CN110196611B (en) | 2018-02-27 | 2018-07-10 | Low dropout regulator and system thereof |
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| Country | Link |
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| CN (1) | CN110196611B (en) |
| TW (1) | TWI693496B (en) |
Cited By (3)
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| CN110703843A (en) * | 2019-10-12 | 2020-01-17 | 佛山科学技术学院 | Digital-analog mixed low-voltage drop voltage stabilizer circuit |
| CN111124025A (en) * | 2019-12-12 | 2020-05-08 | 芯创智（北京）微电子有限公司 | Low-noise linear voltage stabilizing circuit and implementation method thereof |
| CN114185383A (en) * | 2020-09-14 | 2022-03-15 | 华邦电子股份有限公司 | Low dropout voltage regulator |
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|---|---|---|---|---|
| TWI753548B (en) | 2020-08-26 | 2022-01-21 | 華邦電子股份有限公司 | Low-dropout regulator |
| TWI825515B (en) * | 2021-11-26 | 2023-12-11 | 瑞昱半導體股份有限公司 | Digital low-dropout regulator and control method thereof |
| US20230266781A1 (en) * | 2022-02-24 | 2023-08-24 | Mediatek Inc. | Reference voltage auto-switching mechanism used in regulator for saving more power in low-power mode |
| TWI831244B (en) * | 2022-06-15 | 2024-02-01 | 瑞昱半導體股份有限公司 | Low-dropout regulator and operation method thereof |
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Also Published As
| Publication number | Publication date |
|---|---|
| TWI693496B (en) | 2020-05-11 |
| CN110196611B (en) | 2021-06-29 |
| TW201937330A (en) | 2019-09-16 |
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