CN105573395A - Low-dropout linear voltage stabilizing circuit without external capacitor - Google Patents
Low-dropout linear voltage stabilizing circuit without external capacitor Download PDFInfo
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- CN105573395A CN105573395A CN201510741205.XA CN201510741205A CN105573395A CN 105573395 A CN105573395 A CN 105573395A CN 201510741205 A CN201510741205 A CN 201510741205A CN 105573395 A CN105573395 A CN 105573395A
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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
Abstract
The invention discloses a low-dropout linear voltage stabilizing circuit without an external capacitor. The low-dropout linear voltage stabilizing circuit comprises a current type error amplifying circuit and an output stage circuit, wherein the current type error amplifying circuit comprises an error amplifying circuit for outputting current through upward pull and an error amplifying circuit for outputting current through downward pull, negative inputs and positive inputs of the error amplifying circuit for outputting current through upward pull and the error amplifying circuit for outputting current through downward pull are connected with Vref and a feedback port Rfb of the output stage circuit respectively, output ends of the error amplifying circuit for outputting current through upward pull and the error amplifying circuit for outputting current through downward pull are connected with a current regulating transistor grid Pdrive in the output stage circuit, and the output stage circuit comprises a current regulating transistor, a compensation capacitor and a feedback resistor. The circuit detects and regulates fluctuation of output voltage in real time through the current type error amplifying circuit, and transient characteristics under various light load and heavy load conditions can meet output voltage fluctuation with very low requirements.
Description
Technical field
The invention belongs to integrated circuit (IC) design field, particularly relate to a kind of low-dropout linear voltage-regulating circuit (LDO) of non-external electric capacity.
Background technology
Low-dropout linear voltage-regulating circuit not with external electric capacity can reduce by a packaging pin, decrease the external electric capacity on system board and the processing cost decreasing system board level simultaneously, but because the output voltage ripple of the low-dropout linear voltage-regulating circuit not with external electric capacity is larger than the output voltage of the low-dropout linear voltage-regulating circuit of external electric capacity, limit the use of the low-dropout linear voltage-regulating circuit not with external electric capacity.
Patented claim 201420587167.8 discloses a kind of low-dropout linear voltage-regulating circuit, and this low-dropout linear voltage-regulating circuit comprises start-up circuit, output driving circuit, error amplifying circuit, sampling feedback circuit and Correctional tube: described start-up circuit produces starting current to allow whole circuit be in starting state; Described output driving circuit is that output drive signal drives described Correctional tube; Described error amplifying circuit carries out error amplification to the signal of described sampling feedback circuit; Described sampling feedback circuit is sampled to output voltage signal and feeds back to described error amplifying circuit; Described Correctional tube reaches regulated output voltage by adjusting its tube voltage drop.The low-dropout linear voltage-regulating circuit utilizing the utility model to provide can make its stability higher.
But this mode, although can increase alive stability, this circuit does not but have any improvement to output voltage ripple, and power consumption is large.
Summary of the invention
For solving the problem, the object of the present invention is to provide a kind of low-dropout linear voltage-regulating circuit of non-external electric capacity, being intended to reduce output voltage ripple, under various underloading and fully loaded transportation condition, the output voltage fluctuation that transient response also can meet the demands very little.
Another object of the present invention object is the low-dropout linear voltage-regulating circuit providing a kind of non-external electric capacity, this circuit can reduce the output voltage ripple of low-dropout linear voltage-regulating circuit greatly, be particularly useful for the plug-in memory circuit harsher to power requirement, such as flash etc.
For achieving the above object, technical scheme of the present invention is as follows.
A kind of low-dropout linear voltage-regulating circuit of non-external electric capacity, it comprises current mode error amplifying circuit and output-stage circuit, described current mode error amplifying circuit comprises: the error amplifying circuit of pull-up output current and the error amplifying circuit of drop-down output current, the error amplifying circuit of described pull-up output current is connected with the feedback port Rfb (Vout*R2/ (R1+R2)) in output-stage circuit with Vref with positive pole input respectively with the negative pole input of the error amplifying circuit of drop-down output current, the error amplifying circuit of described pull-up output current is connected with the electric current Correctional tube grid Pdrive in output-stage circuit with the output terminal of the error amplifying circuit of drop-down output current, described output-stage circuit comprises electric current Correctional tube, building-out capacitor and feedback resistance.The LDO circuit of the novel non-external electric capacity that the present invention proposes, is detected in real time by current error amplifier and adjusts the fluctuation of output voltage, achieves the output voltage fluctuation that the transient response under various underloading and fully loaded transportation condition can meet the demands very little.
The error amplifying circuit of described pull-up output current has input to pipe MN10 and MN9, and input and be connected with Vref with Rfb respectively to the grid of pipe MN10 with MN9, the source class of MN10 with MN9 is all connected with current source I2.
Further, the error amplifying circuit of described pull-up output current also includes MP9 and MP8, and the leakage level of described MN10 and the leakage level of MN9 are connected with the leakage level/grid of MP8 with the leakage level/grid of MP9 respectively, and the source class of MP9 and MP8 is connected to VDD.
Further, the error amplifying circuit of described pull-up output current also includes MP6, MP7, MP10 and MP11, wherein the leakage level/grid of MP9 is connected with the grid of MP6 with the grid of MP7 respectively with the leakage level/grid of MP8, the source class of MP6/MP7 is all connected with supply voltage VDD, and the leakage level of MP7 is connected with the source class/Ccmop of MP10 with the source class of MP11 respectively with the leakage level of MP6.
Described output-stage circuit includes electric current Correctional tube MP1, building-out capacitor C1, C2 and C3 and feedback resistance R1, R2, the source class of described electric current Correctional tube MP1 is connected with supply voltage VDD, the leakage level of MP1 is connected with the output voltage VO UT of LDO, the grid level Pdrive of MP1 is connected with electric capacity C3 and VOUT with electric capacity C2, MN6 respectively by electric capacity C1, MP10, carry out zero compensation, VOUT is connected with one end of feedback resistance R1, the other end of R1 is connected with R2 one end/Rfb, and the other end of R2 is connected to the ground.
Further, described Ccmop is connected with the electric capacity C2 in output-stage circuit; The error amplifying circuit of described pull-up output current also includes MN7 and MN8, grid level/leakage the level of MP11 is all connected with the grid of MN7 with the grid/leakage level of MN8 with the grid level of MP10, the leakage level of MP10 is all connected with the grid Pdrive of the leakage level of MN7 with the electric current Correctional tube MP1 in output-stage circuit, and the source class of MN7 and the source electrode of MN8 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 described drop-down output current includes input to pipe MP4 and MP5, and wherein, the grid of MP4 with MP5 is connected with Vref with Rfb respectively, and the source electrode of MP4 with MP5 is all connected with current source I1.
Further, the error amplifying circuit of described drop-down output current also includes MN3 and MN4, and the leakage level of described MP4 and the drain electrode of MP5 are connected with the grid/leakage level of MN4 with the grid/leakage level of MN3 respectively.
Further, the error amplifying circuit of described drop-down output current also includes MN1, MN2, MN5 and MN6, grid/leakage the level of MN3 is connected with the grid of MN2 with the grid of MN1 respectively with the grid/leakage level of MN4, the source class of MN1, MN2, MN3, MN4 is all connected to the ground, and the drain electrode of MN1 and the drain electrode of MN2 are connected with the source class/Ccomn of MN6 with the source class of MN5 respectively.
Further, described Ccmon is connected with the electric capacity C3 in output-stage circuit, the error amplifying circuit of described drop-down output current also includes MP2 and MP3, grid level/leakage the level of described MN5 is all connected with the grid of MP3 with the grid/leakage level of MP2 with the grid level of MN6, the leakage level of MN6 is all connected with the grid Pdrive of the leakage level of MP3 with the electric current Correctional tube MP1 in output-stage circuit, and the source class of MP2 is all connected with supply voltage VDD with the source class of MP3.
Described MP1, MP2, MP3, MP4 and MP5 are PMOS, and described MN1, MN2, MN3, MN4, MN5 and MN6 are NMOS tube.
The LDO circuit of the novel non-external electric capacity of the present invention's design, by the error amplifying circuit of pull-up output current and the error amplifying circuit of drop-down output current, real-time detection also adjusts the fluctuation of output voltage, achieves the output voltage fluctuation that the transient response under various underloading and fully loaded transportation condition can meet the demands very little.Especially solve in the application of the various program storage block such as similar flash, the load change of memory module is very violent, and memory module requires again the defect of very narrow reading writing working voltage conditions simultaneously.
Accompanying drawing explanation
Fig. 1 is the circuit diagram that the present invention implements.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Please refer to shown in Fig. 1, is the LDO of the novel non-external electric capacity that the present invention implements, and comprises the error amplifying circuit of pull-up output current, the error amplifying circuit of drop-down output current and output-stage circuit, the grid of input in the error amplifying circuit of pull-up output current to pipe MN10 with MN9 is connected with Vref with Rfb respectively, the source class of MN10 with MN9 is all connected with current source I2, the leakage level of MN10 and the leakage level of MN9 are connected with the leakage level/grid of MP8 with the leakage level/grid of MP9 respectively, leakage level/the grid of MP9 is connected with the grid of MP6 with the grid of MP7 respectively with the leakage level/grid of MP8, the source class of MP6/MP7/MP8/MP9 is all connected with supply voltage VDD, the leakage level of MP7 is connected with the source class/Ccmop of MP10 with the source class of MP11 respectively with the leakage level of MP6, Ccmop is connected with the electric capacity C2 in output-stage circuit, grid level/leakage the level of MP11 is all connected with the grid of MN7 with the grid/leakage level of MN8 with the grid level of MP10, the leakage level of MP10 is all connected with the grid Pdrive of the leakage level of MN7 with the electric current Correctional tube MP1 in output-stage circuit, the source class of MN7 and the source electrode of MN6 are all connected to the ground, the grid of input in the error amplifying circuit of drop-down output current to pipe MP4 with MP5 is connected with Vref with Rfb respectively, the source electrode of MP4 with MP5 is all connected with current source I1, the leakage level of MP4 and the drain electrode of MP5 are connected with the grid/leakage level of MN4 with the grid/leakage level of MN3 respectively, grid/leakage the level of MN3 is connected with the grid of MN2 with the grid of MN1 respectively with the grid/leakage level of MN4, the source class of MN1/MN2/MN3/MN4 is all connected to the ground, the drain electrode of MN1 and the drain electrode of MN2 are connected with the source class/Ccomn of MN6 with the source class of MN5 respectively, Ccmon is connected with the electric capacity C3 in output-stage circuit, grid level/leakage the level of MN5 is all connected with the grid of MP3 with the grid/leakage level of MP2 with the grid level of MN6, the leakage level of MN6 is all connected with the grid Pdrive of the leakage level of MP3 with the electric current Correctional tube MP1 in output-stage circuit, the source class of MP2 is all connected with supply voltage VDD with the source class of MP3, the source class of the electric current Correctional tube MP1 in output-stage circuit is connected with supply voltage VDD, the leakage level of MP1 is connected with the output voltage VO UT of LDO, the grid level Pdrive of MP1 is connected with electric capacity C3 and VOUT with electric capacity C2, MN6 with electric capacity C1, MP10 respectively by resistance R3, carry out zero compensation, VOUT is connected with one end of feedback resistance R1, the other end of R1 is connected with one end of Rfb with R2, and the other end of R2 is connected to the ground.
By the error amplifying circuit of pull-up output current and the error amplifying circuit of drop-down output current, feedback port Rfb (Vout*R2/ (R1+R2)) in Vref and output-stage circuit is compared simultaneously, when output voltage VO UT equals Vref* (R1+R2)/R2, the order of magnitude of the output current of the error amplifying circuit of pull-up output current equals the order of magnitude of the output current of the error amplifying circuit of drop-down output current, there is not extra electric current to the electric current Correctional tube grid Pdrive discharge and recharge in output-stage circuit, output voltage keeps stable, when output voltage VO UT is lower than Vref* (R1+R2)/R2, the order of magnitude of the output current of the error amplifying circuit of pull-up output current is less 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 discharge to the electric current Correctional tube grid Pdrive in output-stage circuit, reduce the voltage of electric current Correctional tube grid Pdrive, improve the size of current of electric current Correctional tube, thus improve output voltage, when output voltage VO UT is higher than Vref* (R1+R2)/R2, the order of magnitude of the output current of the error amplifying circuit of pull-up output current is greater 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 charge to the electric current Correctional tube grid Pdrive in output-stage circuit, improve the voltage of electric current Correctional tube grid Pdrive, reduce the size of current of electric current Correctional tube, thus reduce output voltage VO UT.
The LDO circuit of novel non-external electric capacity of the present invention, by the error amplifying circuit of pull-up output current and the error amplifying circuit of drop-down output current, real-time detection also adjusts the fluctuation of output voltage, achieves the output voltage fluctuation that the transient response under various underloading and fully loaded transportation condition can meet the demands very little.Especially solve in the application of the various program storage block such as similar flash, the load change of memory module is very violent, and memory module requires again the defect of very narrow reading writing working voltage conditions simultaneously.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the low-dropout linear voltage-regulating circuit of a non-external electric capacity, it is characterized in that this circuit comprises current mode error amplifying circuit and output-stage circuit, described current mode error amplifying circuit comprises: the error amplifying circuit of pull-up output current and the error amplifying circuit of drop-down output current, the error amplifying circuit of described pull-up output current is connected with the feedback port Rfb in output-stage circuit with Vref with positive pole input respectively with the negative pole input of the error amplifying circuit of drop-down output current, the error amplifying circuit of described pull-up output current is connected with the electric current Correctional tube grid Pdrive in output-stage circuit with the output terminal of the error amplifying circuit of drop-down output current, described output-stage circuit comprises electric current Correctional tube, building-out capacitor and feedback resistance.
2. the low-dropout linear voltage-regulating circuit of non-external electric capacity as claimed in claim 1, it is characterized in that the error amplifying circuit of described pull-up output current has input to pipe MN10 and MN9, input is connected with Vref with Rfb respectively to the grid of pipe MN10 with MN9, and the source class of MN10 with MN9 is all connected with current source I2.
3. the low-dropout linear voltage-regulating circuit of non-external electric capacity as claimed in claim 2, it is characterized in that the error amplifying circuit of described pull-up output current also includes MP9 and MP8, the leakage level of described MN10 and the leakage level of MN9 are connected with the leakage level/grid of MP8 with the leakage level/grid of MP9 respectively, and the source class of MP9 and MP8 is connected to VDD.
4. the low-dropout linear voltage-regulating circuit of non-external electric capacity as claimed in claim 3, it is characterized in that the error amplifying circuit of described pull-up output current also includes MP6, MP7, MP10 and MP11, wherein the leakage level/grid of MP9 is connected with the grid of MP6 with the grid of MP7 respectively with the leakage level/grid of MP8, the source class of MP6/MP7 is all connected with supply voltage VDD, and the leakage level of MP7 is connected with Ccmop with the source class of MP10 with the source class of MP11 respectively with the leakage level of MP6.
5. the low-dropout linear voltage-regulating circuit of non-external electric capacity as claimed in claim 1, it is characterized in that described output-stage circuit includes electric current Correctional tube MP1, building-out capacitor C1, the resistance-feedback network that C2 and C3 and resistance R1 and R2 forms, the source class of described electric current Correctional tube MP1 is connected with supply voltage VDD, the leakage level of MP1 is connected with the output voltage VO UT of LDO, the grid level Pdrive of MP1 is respectively by electric capacity C1, MP10 and electric capacity C2, MN6 is connected with electric capacity C3 and VOUT, carry out zero compensation, VOUT is connected with one end of feedback resistance R1, the other end of feedback resistance R1 is connected with Rfb with one end of R2, the other end ground connection of R2.
6. the low-dropout linear voltage-regulating circuit of non-external electric capacity as claimed in claims 4 and 5, is characterized in that described Ccmop is connected with the electric capacity C2 in output-stage circuit; The error amplifying circuit of described pull-up output current also includes MN7 and MN8, grid level/leakage the level of MP11 is all connected with the grid of MN7 with the grid/leakage level of MN8 with the grid level of MP10, the leakage level of MP10 is all connected with Pdrive with the grid of the leakage level of MN7 with the electric current Correctional tube MP1 in output-stage circuit, and the source class of MN7 and the source electrode of MN8 are all connected to the ground.
7. the low-dropout linear voltage-regulating circuit of non-external electric capacity as claimed in claim 1, it is characterized in that the error amplifying circuit of described drop-down output current includes input to pipe MP4 and MP5, wherein, the grid of MP4 with MP5 is connected with Vref with Rfb respectively, and the source electrode of MP4 with MP5 is all connected with current source I1.
8. the low-dropout linear voltage-regulating circuit of non-external electric capacity as claimed in claim 7, it is characterized in that the error amplifying circuit of described drop-down output current also includes MN3 and MN4, the leakage level of described MP4 and the drain electrode of MP5 are connected with the grid/leakage level of MN4 with the grid/leakage level of MN3 respectively.
9. the low-dropout linear voltage-regulating circuit of non-external electric capacity as claimed in claim 8, it is characterized in that the error amplifying circuit of described drop-down output current also includes MN1, MN2, MN5 and MN6, grid/leakage the level of MN3 is connected with the grid of MN2 with the grid of MN1 respectively with the grid/leakage level of MN4, the source class of MN1, MN2, MN3, MN4 is all connected to the ground, and the drain electrode of MN1 and the drain electrode of MN2 are connected with the source class/Ccomn of MN6 with the source class of MN5 respectively.
10. the low-dropout linear voltage-regulating circuit of the non-external electric capacity as described in claim 4 and 9, it is characterized in that described Ccmon is connected with the electric capacity C3 in output-stage circuit, the error amplifying circuit of described drop-down output current also includes MP2 and MP3, grid level/leakage the level of described MN5 is all connected with the grid of MP3 with the grid/leakage level of MP2 with the grid level of MN6, the leakage level of MN6 is all connected with the grid Pdrive of the leakage level of MP3 with the electric current Correctional tube MP1 in output-stage circuit, and the source class of MP2 is all connected with supply voltage VDD with the source class of MP3.
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| 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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| 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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| CN105573395A true CN105573395A (en) | 2016-05-11 |
| CN105573395B CN105573395B (en) | 2017-08-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110320964A (en) * | 2019-08-08 | 2019-10-11 | 贵州辰矽电子科技有限公司 | A kind of linear constant current drive module circuit |
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| 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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| 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 |
| US20030102851A1 (en) * | 2001-09-28 | 2003-06-05 | Stanescu Cornel D. | Low dropout voltage regulator with non-miller frequency compensation |
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Address after: 518000, A building, block 9, garden city digital garden, 1079 Nanhai Road, Guangdong, Shenzhen, Nanshan District Patentee after: Chipsea Technology (Shenzhen) Co., Ltd. Address before: 518067 Nanshan District, Shenzhen, Nanhai Avenue, garden city, No. 1079, building A, block, floor 9 Patentee before: Xinhai Science and Technology Co., Ltd., Shenzhen City |