CN105573395B - A kind of low-dropout linear voltage-regulating circuit of non-external electric capacity - Google Patents
A kind of low-dropout linear voltage-regulating circuit of non-external electric capacity Download PDFInfo
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- CN105573395B CN105573395B CN201510741205.XA CN201510741205A CN105573395B CN 105573395 B CN105573395 B CN 105573395B CN 201510741205 A CN201510741205 A CN 201510741205A CN 105573395 B CN105573395 B CN 105573395B
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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 a kind of low-dropout linear voltage-regulating circuit of non-external electric capacity, it includes current mode error amplifying circuit and output-stage circuit, and the current mode error amplifying circuit includes：Pull up the error amplifying circuit of output current and the error amplifying circuit of drop-down output current, the negative pole input and positive pole input of the error amplifying circuit and the error amplifying circuit for pulling down output current of the pull-up output current are connected with the feedback port Rfb in Vref and output-stage circuit respectively, the error amplifying circuit of the pull-up output current is connected with the output end of the error amplifying circuit of drop-down output current with the electric current adjustment tube grid Pdrive in output-stage circuit, and the output-stage circuit includes electric current adjustment pipe, compensating electric capacity and feedback resistance.The circuit detected and adjusts the fluctuation of output voltage in real time by current error amplifier, and the output voltage fluctuation for requiring very small can be met by realizing the transient response under various underloadings and fully loaded transportation condition.
Description
Technical field
The invention belongs to IC design field, more particularly to a kind of low-dropout linear voltage-regulating circuit of non-external electric capacity
(LDO)。
Background technology
It can reduce by a packaging pin without the low-dropout linear voltage-regulating circuit of external electric capacity, while reducing system board
On external electric capacity and reduce system board level processing cost, but be due to without external electric capacity low pressure difference linearity voltage stabilizing electricity
The output voltage ripple on road is bigger than the output voltage of the low-dropout linear voltage-regulating circuit of external electric capacity, limits without external electric capacity
Low-dropout linear voltage-regulating circuit use.
Patent application 201420587167.8 discloses a kind of low-dropout linear voltage-regulating circuit, low pressure difference linearity voltage stabilizing electricity
Road includes start-up circuit, output driving circuit, error amplifying circuit, sampling feedback circuit and adjustment pipe：The start-up circuit is
Producing starting current allows whole circuit to be in starting state；The output driving circuit is that output drive signal drives the adjustment
Pipe；The error amplifying circuit is to carry out error amplification to the signal of the sampling feedback circuit；The sampling feedback circuit is
Output voltage signal is sampled and the error amplifying circuit is fed back to；The adjustment pipe is reached by adjusting its tube voltage drop
To regulated output voltage.The low-dropout linear voltage-regulating circuit provided using the utility model can stabilizing it property it is higher.
But this mode, although alive stability can be increased, but the circuit is not appointed but to output voltage ripple
What improves, and power consumption is big.
The content of the invention
To solve the above problems, it is an object of the invention to provide a kind of low pressure difference linearity voltage stabilizing of non-external electric capacity electricity
Road, it is intended to reduce output voltage ripple, under various underloadings and fully loaded transportation condition, it is very small that transient response can also meet requirement
Output voltage is fluctuated.
Another object of the present invention purpose is to provide a kind of low-dropout linear voltage-regulating circuit of non-external electric capacity, the electricity
Road can substantially reduce the output voltage ripple of low-dropout linear voltage-regulating circuit, be particularly suitable for use in harsher to power requirement
Plug-in storage circuit, such as flash.
To achieve the above object, technical scheme is as follows.
A kind of low-dropout linear voltage-regulating circuit of non-external electric capacity, it includes current mode error amplifying circuit and output stage electricity
Road, the current mode error amplifying circuit includes：Pull up the error amplifying circuit of output current and the error of drop-down output current
Amplifying circuit, the negative pole input of the error amplifying circuit of the pull-up output current and the error amplifying circuit of drop-down output current
It is connected respectively with the feedback port Rfb (Vout*R2/ (R1+R2)) in Vref and output-stage circuit with positive pole input, the pull-up
Electricity in the output end and output-stage circuit of the error amplifying circuit of output current and the error amplifying circuit of drop-down output current
Stream adjustment tube grid Pdrive is connected, and the output-stage circuit includes electric current adjustment pipe, compensating electric capacity and feedback resistance.The present invention
The LDO circuit of the new non-external electric capacity proposed, detects and adjusts the fluctuation of output voltage in real time by current error amplifier,
Realize the transient response under various underloadings and fully loaded transportation condition and can meet and require very small output voltage fluctuation.
The error amplifying circuit of the pull-up output current has input to pipe MN10 and MN9, inputs to pipe MN10 and MN9
Grid be connected respectively with Vref and Rfb, MN10 and MN9 source electrode are all connected with current source I2.
Further, the error amplifying circuit of the pull-up output current also includes MP9 and MP8, the drain electrode of the MN10
It is connected respectively with MP9 drain/gate and MP8 drain/gate with MN9 drain electrode, MP9 and MP8 source electrode are connected to VDD.
Further, the error amplifying circuit of the pull-up output current also includes MP6, MP7, MP10 and MP11, its
Middle MP9 drain/gate and MP8 drain/gate are connected with MP7 grid and MP6 grid respectively, MP6/MP7 source electrode
All it is connected with supply voltage VDD, the source electrode and MP10 source electrode/Ccmop phases of MP7 drain electrode and MP6 drain electrode respectively with MP11
Even.
The output-stage circuit includes electric current adjustment pipe MP1, compensating electric capacity C1, C2 and C3 and feedback resistance R1, R2, institute
The source electrode for stating electric current adjustment pipe MP1 is connected with supply voltage VDD, and MP1 drain electrode is connected with LDO output voltage VO UT, MP1's
Grid Pdrive is connected by electric capacity C1, MP10 and electric capacity C2, MN6 and electric capacity C3 with VOUT respectively, to carry out zero compensation,
VOUT is connected with feedback resistance R1 one end, and the R1 other end is connected with R2 one end/Rfb, and the R2 other end is connected to the ground.
Further, the Ccmop is connected with the electric capacity C2 in output-stage circuit；The error of the pull-up output current is put
Big circuit also includes MN7 and MN8, the grid of MP11 gate/drain and MP10 grid and MN8 gate/drain and MN7
All it is connected, MP10 drain electrode is all connected with MN7 drain electrode with the grid Pdrive of the electric current adjustment pipe MP1 in output-stage circuit,
MN7 source electrode and MN8 source electrode are all connected to the ground.
Described MP6, MP7, MP8, MP9, MP10 and MP11 are PMOS, and described MN7, MN8, MN9 and MN10 are
NMOS tube.
The error amplifying circuit of the drop-down output current includes input to pipe MP4 and MP5, wherein, MP4 and MP5's
Grid is connected with Vref and Rfb respectively, and MP4 and MP5 source electrode are all connected with current source I1.
Further, the error amplifying circuit of the drop-down output current also includes MN3 and MN4, the drain electrode of the MP4 and
MP5 drain electrode is connected with MN3 gate/drain and MN4 gate/drain respectively.
Further, the error amplifying circuit of the drop-down output current also includes MN1, MN2, MN5 and MN6, MN3's
Gate/drain and MN4 gate/drain are connected with MN1 grid and MN2 grid respectively, MN1, MN2, MN3, MN4 source electrode
All it is connected to the ground, MN1 drain electrode and MN2 drain electrode are connected with MN5 source electrode and MN6 source electrode/Ccomn respectively.
Further, the Ccomn is connected with the electric capacity C3 in output-stage circuit, and the error of the drop-down output current is put
Big circuit also includes MP2 and MP3, the grid of the gate/drain of the MN5 and MN6 grid and MP2 gate/drain and MP3
Pole is all connected, and MN6 drain electrode is all connected with MP3 drain electrode with the grid Pdrive of the electric current adjustment pipe MP1 in output-stage circuit,
MP2 source electrode and MP3 source electrode are all connected with supply voltage VDD.
Described MP1, MP2, MP3, MP4 and MP5 are PMOS, and described MN1, MN2, MN3, MN4, MN5 and MN6 are
NMOS tube.
The LDO circuit for the new non-external electric capacity that the present invention is designed, by pull up output current error amplifying circuit and
The error amplifying circuit of output current is pulled down, the fluctuation of output voltage is detected and adjust in real time, realized in various underloadings and again
Transient response under the conditions of load, which can be met, requires very small output voltage fluctuation.Especially solve each in similar flash etc.
In the application for planting program storage block, the load change of memory module is very violent, while memory module requires very narrow again
The defect of reading writing working voltage conditions.
Brief description of the drawings
Fig. 1 is the circuit diagram that the present invention is implemented.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
It refer to shown in Fig. 1, be the LDO for the new non-external electric capacity that the present invention is implemented, including pull up output current
Error amplifying circuit, the error amplifying circuit and output-stage circuit for pulling down output current；Pull up the error amplification electricity of output current
Input in road is connected with Vref and Rfb respectively to pipe MN10 and MN9 grid, MN10 and MN9 source electrode all with current source I2
It is connected, MN10 drain electrode and MN9 drain electrode are connected with MP9 drain/gate and MP8 drain/gate respectively, MP9 drain electrode/
Grid and MP8 drain/gate are connected with MP7 grid and MP6 grid respectively, MP6/MP7/MP8/MP9 source electrode all with
Supply voltage VDD is connected, and MP7 drain electrode and MP6 drain electrode are connected with MP11 source electrode and MP10 source electrode/Ccmop respectively,
Ccmop is connected with the electric capacity C2 in output-stage circuit, MP11 gate/drain and MP10 grid and MN8 gate/drain and
MN7 grid is all connected, the grid of the electric current adjustment pipe MP1 in MP10 drain electrode and MN7 drain electrode and output-stage circuit
Pdrive is connected, and MN7 source electrode and MN6 source electrode are all connected to the ground；Pull down defeated in the error amplifying circuit of output current
Enter and pipe MP4 and MP5 grid are connected with Vref and Rfb respectively, MP4 and MP5 source electrode are all connected with current source I1, MP4's
Drain electrode and MP5 drain electrode are connected with MN3 gate/drain and MN4 gate/drain respectively, MN3 gate/drain and MN4's
Gate/drain is connected with MN1 grid and MN2 grid respectively, and MN1/MN2/MN3/MN4 source electrode is all connected to the ground, MN1's
Drain electrode and MN2 drain electrode are connected with MN5 source electrode and MN6 source electrode/Ccomn respectively, the electric capacity in Ccomn and output-stage circuit
C3 be connected, MN5 gate/drain is all connected with MN6 grid with MP2 gate/drain with MP3 grid, MN6 drain electrode with
MP3 drain electrode is all connected with the grid Pdrive of the electric current adjustment pipe MP1 in output-stage circuit, MP2 source electrode and MP3 source electrode
All it is connected with supply voltage VDD；The source electrode of electric current adjustment pipe MP1 in output-stage circuit is connected with supply voltage VDD, MP1's
Drain electrode is connected with LDO output voltage VO UT, and MP1 grid Pdrive passes through resistance R3 and electric capacity C1, MP10 and electric capacity respectively
C2, MN6 and electric capacity C3 are connected with VOUT, and to carry out zero compensation, VOUT is connected with feedback resistance R1 one end, the R1 other end
It is connected with Rfb with R2 one end, the R2 other end is connected to the ground.
By pulling up the error amplifying circuit of output current and the error amplifying circuit of drop-down output current, while to Vref
It is compared with the feedback port Rfb (Vout*R2/ (R1+R2)) in output-stage circuit, when output voltage VO UT is equal to Vref*
(R1+R2)/R2 when, pull up output current error amplifying circuit output current order of magnitude be equal to drop-down output current
Error amplifying circuit output current order of magnitude, in the absence of extra electric current in output-stage circuit electric current adjust
Tube grid Pdrive discharge and recharges, output voltage keeps stable；When output voltage VO UT is less than Vref* (R1+R2)/R2, pull-up
The order of magnitude of the output current of the error amplifying circuit of output current is less than the error amplifying circuit of drop-down output current
, there is extra electric current and tube grid Pdrive electric discharges adjusted to the electric current in output-stage circuit in the order of magnitude of output current,
Electric current adjustment tube grid Pdrive voltage is reduced, the size of current that electric current adjusts pipe is improved, so as to improve output voltage；When defeated
When going out voltage VOUT higher than Vref* (R1+R2)/R2, the absolute value of the output current of the error amplifying circuit of output current is pulled up
Size is more than the order of magnitude of the output current of the error amplifying circuit of drop-down output current, there is extra electric current to output
Electric current adjustment tube grid Pdrive chargings in level circuit, improve electric current adjustment tube grid Pdrive voltage, reduction electric current is adjusted
The size of current of homogeneous tube, so as to reduce output voltage VO UT.
The LDO circuit of the new non-external electric capacity of the present invention, by pulling up the error amplifying circuit of output current with
The error amplifying circuit of output current is drawn, detects and adjusts the fluctuation of output voltage in real time, realize in various underloadings and heavy duty
Under the conditions of transient response can meet and require very small output voltage fluctuation.Especially solve various in similar flash etc.
In the application of program storage block, the load of memory module change is very violent, while memory module requires very narrow reading again
Write the defect of operating voltage condition.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.
Claims (7)
1. a kind of low-dropout linear voltage-regulating circuit of non-external electric capacity, it is characterised in that the circuit includes current mode error and amplifies electricity
Road and output-stage circuit, the current mode error amplifying circuit include：Pull up the error amplifying circuit of output current and pull down defeated
Go out the error amplifying circuit of electric current, the error amplifying circuit of the pull-up output current and the error amplification electricity of drop-down output current
The negative pole input and positive pole input on road are connected with the feedback port Rfb in Vref and output-stage circuit respectively, the pull-up output
Electric current in the output end and output-stage circuit of the error amplifying circuit of electric current and the error amplifying circuit of drop-down output current is adjusted
Homogeneous tube grid Pdrive is connected, and the output-stage circuit includes electric current adjustment pipe, compensating electric capacity and feedback resistance；Pull-up output electricity
The error amplifying circuit of stream has input to pipe MN10 and MN9, input to pipe MN10 and MN9 grid respectively with Vref and Rfb
It is connected, MN10 and MN9 source electrode are all connected with current source I2；The error amplifying circuit of drop-down output current includes input to pipe
MP4 and MP5, wherein, MP4 and MP5 grid are connected with Vref and Rfb respectively, MP4 and MP5 source electrode all with current source I1 phases
Even；The output-stage circuit includes the resistance of electric current adjustment pipe MP1, compensating electric capacity C1, C2 and C3 and resistance R1 and R2 composition
Feedback network, the source electrode of the electric current adjustment pipe MP1 is connected with supply voltage VDD, MP1 drain electrode and LDO output voltage
VOUT is connected, and MP1 grid Pdrive is connected by resistance R3 and electric capacity C1 with VOUT, and MP1 grid Pdrive passes through MP10
It is connected with electric capacity C2 with VOUT, MP1 grid Pdrive is connected by MN6 and electric capacity C3 with VOUT, to carry out zero compensation,
VOUT is connected with feedback resistance R1 one end, and the feedback resistance R1 other end is connected with R2 one end and Rfb, R2 another termination
Ground.
2. the low-dropout linear voltage-regulating circuit of non-external electric capacity as claimed in claim 1, it is characterised in that the pull-up output
The error amplifying circuit of electric current also includes MP9 and MP8, the drain electrode of the MN10 and MN9 drain respectively with MP9 drain electrode/
Grid is connected with MP8 drain/gate, and MP9 and MP8 source electrode are connected to VDD.
3. the low-dropout linear voltage-regulating circuit of non-external electric capacity as claimed in claim 2, it is characterised in that the pull-up output
The error amplifying circuit of electric current also includes MP6, MP7, MP10 and MP11, wherein MP9 drain/gate and MP8 drain electrode/grid
Pole is connected with MP7 grid and MP6 grid respectively, and MP6/MP7 source electrode is all connected with supply voltage VDD, MP7 drain electrode and
MP6 drain electrode is connected with MP11 source electrode and MP10 source electrode respectively, wherein, the section that MP6 drain electrode is connected with MP10 source electrode
Point is Ccmop.
4. the low-dropout linear voltage-regulating circuit of non-external electric capacity as claimed in claim 3, it is characterised in that the Ccmop and defeated
The electric capacity C2 gone out in grade circuit is connected；The error amplifying circuit of the pull-up output current also includes MN7 and MN8, MP11's
Gate/drain is all connected with MP10 grid with MN8 gate/drain with MN7 grid, MP10 drain electrode and MN7 drain electrode
All be connected with the grid Pdrive of the electric current adjustment pipe MP1 in output-stage circuit, MN7 source electrode and MN8 source electrode all with ground phase
Even.
5. the low-dropout linear voltage-regulating circuit of non-external electric capacity as claimed in claim 3, it is characterised in that the drop-down output
The error amplifying circuit of electric current also includes MN3 and MN4, the grid/leakage of the drain electrode of the MP4 and MP5 drain electrode respectively with MN3
Pole is connected with MN4 gate/drain.
6. the low-dropout linear voltage-regulating circuit of non-external electric capacity as claimed in claim 5, it is characterised in that the drop-down output
The error amplifying circuit of electric current also includes MN1, MN2, MN5 and MN6, MN3 gate/drain and MN4 gate/drain difference
It is connected with MN1 grid and MN2 grid, MN1, MN2, MN3, MN4 source electrode are all connected to the ground, MN1 drain electrode and MN2 leakage
Pole is connected with MN5 source electrode and MN6 source electrode/Ccomn respectively, and the node that wherein MN2 drain electrode is connected with MN6 source electrode is
Ccomn。
7. the low-dropout linear voltage-regulating circuit of non-external electric capacity as claimed in claim 6, it is characterised in that the Ccomn and defeated
The electric capacity C3 gone out in grade circuit is connected, and the error amplifying circuit of the drop-down output current also includes MP2 and MP3, the MN5
Gate/drain be all connected with MP2 gate/drain with MP3 grid with MN6 grid, MN6 drain electrode and MP3 drain electrode
All be connected with the grid Pdrive of the electric current adjustment pipe MP1 in output-stage circuit, MP2 source electrode and MP3 source electrode all with power supply
Voltage VDD is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510741205.XA CN105573395B (en) | 2015-11-04 | 2015-11-04 | A kind of low-dropout linear voltage-regulating circuit of non-external electric capacity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510741205.XA CN105573395B (en) | 2015-11-04 | 2015-11-04 | A kind of low-dropout linear voltage-regulating circuit of non-external electric capacity |
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| Publication Number | Publication Date |
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| CN105573395A CN105573395A (en) | 2016-05-11 |
| CN105573395B true CN105573395B (en) | 2017-08-22 |
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| CN110320964B (en) * | 2019-08-08 | 2024-02-27 | 贵州辰矽电子科技有限公司 | Linear constant current driving module circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6259238B1 (en) * | 1999-12-23 | 2001-07-10 | Texas Instruments Incorporated | Brokaw transconductance operational transconductance amplifier-based micropower low drop out voltage regulator having counterphase compensation |
| US6518737B1 (en) * | 2001-09-28 | 2003-02-11 | Catalyst Semiconductor, Inc. | Low dropout voltage regulator with non-miller frequency compensation |
| CN101881983B (en) * | 2010-04-16 | 2012-03-28 | 北京利云技术开发公司 | Numerical-control low-noise high-power-supply ripple suppression low-dropout regulator |
| CN204331533U (en) * | 2014-10-08 | 2015-05-13 | 杭州宽福科技有限公司 | A kind of low-dropout linear voltage-regulating circuit |
| CN204536968U (en) * | 2014-11-27 | 2015-08-05 | 广州市力驰微电子科技有限公司 | A kind of high power LD O circuit without external electric capacity |
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