CN102830744A - Linear voltage regulator employing frequency compensation - Google Patents
Linear voltage regulator employing frequency compensation Download PDFInfo
- Publication number
- CN102830744A CN102830744A CN2012103435862A CN201210343586A CN102830744A CN 102830744 A CN102830744 A CN 102830744A CN 2012103435862 A CN2012103435862 A CN 2012103435862A CN 201210343586 A CN201210343586 A CN 201210343586A CN 102830744 A CN102830744 A CN 102830744A
- Authority
- CN
- China
- Prior art keywords
- voltage regulator
- linear voltage
- follower
- circuit
- frequency compensation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
The invention discloses a linear voltage regulator employing frequency compensation, comprising a band-gap reference circuit, an error amplifier, a PMOS (P-channel metal oxide semiconductor) PT (pass transistor) and feedback voltage-dividing resistors R1 and R2. Particularly, the linear voltage regulator is provided with a frequency compensation component; the frequency compensation component comprises a follower, an off-chip capacitor and an RC (resistor-capacitor) series circuit, wherein the follower is arranged between the output of the error amplifier and the grid electrode of the PMOS PT; the RC series circuit is arranged between the positive electrode of the input end of the linear voltage regulator and the input of the follower; and the off-chip capacitor is arranged at the output end of the linear voltage regulator in parallel. With the application of the technical scheme of the invention, the circuit improvement of the linear voltage regulator is based on the PMOS process, the addition of circuit elements is accordingly realized, and the off-chip capacitor can adopt a ceramic capacitor with low cost and high capacitance, so that the operating stability of the linear voltage regulator is improved at low cost.
Description
Technical field
The present invention relates to a kind of IC design, relate in particular to a kind of circuit structure improvement of stability lifting of linear voltage regulator, make it possess frequency compensated performance.
Background technology
Begin most when design linear voltage regulator (be called for short LDO), what design of its adjustment pipe was adopted is NPN and PNP pipe, and voltage is big and power consumption is high but the drawback of this design comes off exactly.If therefore in portable electronic products, use this design, just shortened the power-up period of electronic product greatly, improve this situation and will structurally improve its design.Through continuous effort and checking repeatedly; Adjustment pipe to LDO uses the MOS structure just can prolong power-on time; Such as power adjustment pipe is adopted BiCMOS (Bipolar and CMOS), BCDMOS (Bipolar, CMOS and DMOS), CMOS, NMOS or PMOS structure, what adopted domestic and international most of production commercial city at present is CMOS technology.Because the characteristic of MOS self low quiescent current makes it have the characteristics of low-power consumption and low pressure differential.Above advantage makes this structure become a huge breakthrough at applied electronic applications, also makes the more power saving of use of electronic product, and power-up period is able to prolong the demand of well having catered to the user.
LDO is of wide application, and then, still there is the deficiency on a lot of technical indicators in present LDO; For example: the Dropout voltage ratio is bigger; Quiescent current is bigger, and conversion efficiency is low, and output current is less etc.; In order to remedy the weak point of these technical indicators, LDO develops towards following direction: (1) Dropout voltage is more and more lower; (2) quiescent current is more and more littler; (3) output current is increasing; (4) output noise is more and more lower; (5) the electric capacity requirement is fewer and feweri; (6) additional function is more and more perfect; (7) package area is more and more littler.
Summary of the invention
In view of the defective of above-mentioned prior art, the present invention aims to provide a kind of frequency compensated linear voltage regulator, introduces the conventional linear voltage stabilizer through the circuit elements device based on PMOS technology, to promote the stability of linear voltage regulator running status.
For realizing the purpose of the invention described above; Its technical solution is: a kind of frequency compensated linear voltage regulator; The basic structure of said voltage stabilizer comprises band-gap reference circuit, error amplifier, PMOS adjustment pipe PT and feedback divider resistance R1, R2; It is characterized in that: said linear voltage regulator is provided with the frequency compensation assembly, and said frequency compensation assembly comprises outer electric capacity of follower, sheet and RC series circuit, and wherein the follower output that is arranged in error amplifier is managed between the grid of PT with the PMOS adjustment; Said RC series circuit is located between the input of positive pole and follower of linear voltage regulator input end, and the linear voltage regulator output terminal is located in said outer electric capacity parallel connection.
Further, said error amplifier is collapsible cascade amplifier.
Further, said linear voltage regulator also is provided with current foldback circuit, and said current foldback circuit is located at the output and the PMOS adjustment of follower and is managed between the collector of PT.
Further, said outer electric capacity is at least ceramic condenser.
The application of technical scheme of the present invention; Its remarkable advantage that compares to existing linear voltage regulator is presented as: because the circuit of linear voltage regulator improves the interpolation that realizes the circuit elements device based on PMOS technology; And the outer electric capacity of sheet can adopt the ceramic condenser of low cost, high appearance value, under low cost, has realized promoting the stability of linear voltage regulator operation.
Description of drawings
Fig. 1 is the electrical block diagram of linear voltage regulator of the present invention.
Embodiment
Following constipation closes the embodiment accompanying drawing, and specific embodiments of the invention is done further to detail, so that technical scheme of the present invention is easier to understand, grasp.
The present invention innovates the linear voltage regulator that has proposed a kind of tool frequency compensation performance, on the basis of conventional linear voltage stabilizer basic structure (being band-gap reference circuit, error amplifier, PMOS adjustment pipe PT and feedback divider resistance R1, R2), increases the frequency compensation assembly that promotes stability.As shown in Figure 1; It comprises follower, the outer electric capacity Cload of sheet and RC series circuit; Wherein follower is arranged between the grid of output and PMOS adjustment pipe PT of error amplifier; This RC series circuit is located between the input of positive pole and follower of linear voltage regulator input end, and the linear voltage regulator output terminal is located in the outer electric capacity parallel connection of this sheet.Further, wherein error amplifier is collapsible cascade amplifier, and benefit is: gain is big, with regard to one-level, fewer zero limit is arranged, and stability is relatively good; The outer electric capacity of sheet can be ceramic condenser at least, make dominant pole very near initial point, frequency is very low.And this linear voltage regulator also is provided with current foldback circuit, is located between the collector of output and PMOS adjustment pipe PT of follower.This current foldback circuit is various informative, and the ultimate principle summary reaches and is described below for example.
Ultimate principle: when the output current change made sample rate current greater than setting value I0 greatly, output was limited on the electric current of this moment.Output load current continues to increase, and output voltage begins to descend, and by short circuit, the electric current of this moment is also constant up to output.PT is the adjustment pipe of LDO output, and P1 is the current sample pipe of overcurrent protection, and P2 is a switching tube.P3, P4, N1, N2 forms the image current source structure, is used for making sample rate current mirror image output current accurately.N3 mirror image sample rate current and reference current I0 do comparison.
As shown in Figure 2, be a kind of simple and easy and preferred current foldback circuit synoptic diagram.When load current was very little, electric current was less than I0 among the N3, and promptly the A point voltage is near VDD, and switching tube P2 turn-offs.So during operate as normal, P2 turn-offs, overcurrent protection there is not influence to operate as normal.When load current rises; Following process is arranged: electric current also rises among the N3; Marquis A point voltage can descend when it surpasses I0, reduces thereby the grid point position rising that makes P2 manage beginning conducting adjustment pipe PT forces output current to reduce sample rate current, and promptly the N3 electric current reduces.This is a negative feedback, and final sample rate current can be equilibrated at above the I0.
A kind of current foldback circuit synoptic diagram as shown in Figure 3.Wherein Mp is the adjustment pipe, and the last voltage of Rsns can increase along with the increase of electric current, judges whether overcurrent through comparer at the back, produces the Vcl signal, gives the switching tube of back, thereby the grid voltage of control Mp reaches the purpose of control output current.
Another kind of current foldback circuit synoptic diagram as shown in Figure 4.Wherein Mp is the adjustment pipe; The electric current of Ms mirror image output through on Rsns, producing a pressure drop Vsns-Vout, increases along with increasing in the shop of output; Judging whether overcurrent through comparator C LA then; Produce the Vcl signal, give the switching tube of back, thereby the grid voltage of control Mp reaches the purpose of control output current.
Under this linear voltage regulator duty, keep apart output of the high impedance of error amplifier and the big stray capacitance of adjustment pipe PT, make the limit of a low frequency be divided into the limit of two relative high frequency, help the stable of system with follower.Introduce with Cc, Rc series connection and offset time dominant pole a zero point, the adjustment parameter can move on to inferior dominant pole beyond the unity gain bandwidth GBW, makes system stability.
When load current becomes big; The impedance of output diminishes; Thereby dominant pole is moved to high frequency direction, but, make this limit be in very low frequency place because there is the outer electric capacity Cload of a very big sheet at the dominant pole place; And owing to make time dominant pole be in the very high place of frequency again the zero point that adds.So along with the change of load current is big, as long as export when also being in normal condition, stability can both guarantee.
The application of technical scheme of the present invention; Its remarkable advantage that compares to existing linear voltage regulator is presented as: because the circuit of linear voltage regulator improves the interpolation that realizes the circuit elements device based on PMOS technology; And the outer electric capacity of sheet can adopt the ceramic condenser of low cost, high appearance value, under low cost, has realized promoting the stability of linear voltage regulator operation.
Claims (4)
1. frequency compensated linear voltage regulator; The basic structure of said voltage stabilizer comprises band-gap reference circuit, error amplifier, PMOS adjustment pipe PT and feedback divider resistance R1, R2; It is characterized in that: said linear voltage regulator is provided with the frequency compensation assembly; Said frequency compensation assembly comprises follower, the outer electric capacity of sheet and RC series circuit; Wherein follower is arranged between the grid of output and PMOS adjustment pipe PT of error amplifier, and said RC series circuit is located between the input of positive pole and follower of linear voltage regulator input end, and the linear voltage regulator output terminal is located in said outer electric capacity parallel connection.
2. a kind of frequency compensated linear voltage regulator as claimed in claim 1 is characterized in that: said error amplifier is collapsible cascade amplifier.
3. a kind of frequency compensated linear voltage regulator as claimed in claim 1, it is characterized in that: said linear voltage regulator also is provided with current foldback circuit, and said current foldback circuit is located at the output and the PMOS adjustment of follower and is managed between the collector of PT.
4. a kind of frequency compensated linear voltage regulator as claimed in claim 1 is characterized in that: said outer electric capacity is at least ceramic condenser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103435862A CN102830744A (en) | 2012-09-17 | 2012-09-17 | Linear voltage regulator employing frequency compensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103435862A CN102830744A (en) | 2012-09-17 | 2012-09-17 | Linear voltage regulator employing frequency compensation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102830744A true CN102830744A (en) | 2012-12-19 |
Family
ID=47333915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012103435862A Pending CN102830744A (en) | 2012-09-17 | 2012-09-17 | Linear voltage regulator employing frequency compensation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102830744A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104238613A (en) * | 2014-09-01 | 2014-12-24 | 东南大学 | Digital circuit low drop-out linear voltage stabilizer |
| CN105138062A (en) * | 2014-05-29 | 2015-12-09 | 展讯通信（上海）有限公司 | System improving load regulation rate of low-pressure-difference linear voltage regulator |
| CN105229551A (en) * | 2013-05-28 | 2016-01-06 | 德克萨斯仪器股份有限公司 | Electronics current-limiting apparatus |
| CN105955387A (en) * | 2016-05-12 | 2016-09-21 | 西安电子科技大学 | Double-ring protection low drop out (LDO) linear voltage regulator |
| WO2016195606A1 (en) | 2015-06-03 | 2016-12-08 | Topçu Süleyman | Parallel and redundant voltage regulator system |
| CN108445959A (en) * | 2018-05-28 | 2018-08-24 | 佛山华芯微特科技有限公司 | A kind of low pressure difference linear voltage regulator of the outer capacitance of optional contact pin |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030128489A1 (en) * | 2001-12-13 | 2003-07-10 | Tomonari Katoh | Overcurrent limitation circuit |
| US20100141223A1 (en) * | 2008-12-09 | 2010-06-10 | Qualcomm Incorporated | Low drop-out voltage regulator with wide bandwidth power supply rejection ratio |
| US20100148735A1 (en) * | 2008-12-15 | 2010-06-17 | Stmicroelectronics Design And Apparatus S.R.O. | Enhanced efficiency low-dropout linear regulator and corresponding method |
| CN101847028A (en) * | 2010-04-14 | 2010-09-29 | 广州市广晟微电子有限公司 | Dynamic compensation circuit with ultra-low power consumption and linear regulator with the same |
| CN102073332A (en) * | 2010-12-28 | 2011-05-25 | 华东师范大学 | Low temperature coefficient complementary metal oxide semiconductor (CMOS) band-gap reference circuit of output belt low drop-out linear voltage regulator |
| CN102096434A (en) * | 2010-12-23 | 2011-06-15 | 东南大学 | High-slew-rate error amplifier-based high-accuracy and high-speed low dropout (LDO) regulator circuit |
| CN102200791A (en) * | 2011-03-15 | 2011-09-28 | 上海宏力半导体制造有限公司 | Low dropout linear regulator structure |
| CN202110462U (en) * | 2011-05-11 | 2012-01-11 | 电子科技大学 | LDO based on dynamic zero-pole tracking techniques |
| CN202887038U (en) * | 2012-09-17 | 2013-04-17 | 江苏国石半导体有限公司 | Linear voltage regulator for frequency compensation |
-
2012
- 2012-09-17 CN CN2012103435862A patent/CN102830744A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030128489A1 (en) * | 2001-12-13 | 2003-07-10 | Tomonari Katoh | Overcurrent limitation circuit |
| US20100141223A1 (en) * | 2008-12-09 | 2010-06-10 | Qualcomm Incorporated | Low drop-out voltage regulator with wide bandwidth power supply rejection ratio |
| US20100148735A1 (en) * | 2008-12-15 | 2010-06-17 | Stmicroelectronics Design And Apparatus S.R.O. | Enhanced efficiency low-dropout linear regulator and corresponding method |
| CN101847028A (en) * | 2010-04-14 | 2010-09-29 | 广州市广晟微电子有限公司 | Dynamic compensation circuit with ultra-low power consumption and linear regulator with the same |
| CN102096434A (en) * | 2010-12-23 | 2011-06-15 | 东南大学 | High-slew-rate error amplifier-based high-accuracy and high-speed low dropout (LDO) regulator circuit |
| CN102073332A (en) * | 2010-12-28 | 2011-05-25 | 华东师范大学 | Low temperature coefficient complementary metal oxide semiconductor (CMOS) band-gap reference circuit of output belt low drop-out linear voltage regulator |
| CN102200791A (en) * | 2011-03-15 | 2011-09-28 | 上海宏力半导体制造有限公司 | Low dropout linear regulator structure |
| CN202110462U (en) * | 2011-05-11 | 2012-01-11 | 电子科技大学 | LDO based on dynamic zero-pole tracking techniques |
| CN202887038U (en) * | 2012-09-17 | 2013-04-17 | 江苏国石半导体有限公司 | Linear voltage regulator for frequency compensation |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105229551A (en) * | 2013-05-28 | 2016-01-06 | 德克萨斯仪器股份有限公司 | Electronics current-limiting apparatus |
| US9793707B2 (en) | 2013-05-28 | 2017-10-17 | Texas Instruments Incorporated | Fast transient precision power regulation apparatus |
| CN105138062A (en) * | 2014-05-29 | 2015-12-09 | 展讯通信（上海）有限公司 | System improving load regulation rate of low-pressure-difference linear voltage regulator |
| CN104238613A (en) * | 2014-09-01 | 2014-12-24 | 东南大学 | Digital circuit low drop-out linear voltage stabilizer |
| CN104238613B (en) * | 2014-09-01 | 2015-10-28 | 东南大学 | A kind of digital circuit low pressure difference linear voltage regulator |
| WO2016195606A1 (en) | 2015-06-03 | 2016-12-08 | Topçu Süleyman | Parallel and redundant voltage regulator system |
| CN105955387A (en) * | 2016-05-12 | 2016-09-21 | 西安电子科技大学 | Double-ring protection low drop out (LDO) linear voltage regulator |
| CN105955387B (en) * | 2016-05-12 | 2018-07-13 | 西安电子科技大学 | A kind of bicyclic protection low voltage difference LDO linear voltage regulators |
| CN108445959A (en) * | 2018-05-28 | 2018-08-24 | 佛山华芯微特科技有限公司 | A kind of low pressure difference linear voltage regulator of the outer capacitance of optional contact pin |
| CN108445959B (en) * | 2018-05-28 | 2024-05-17 | 广东华芯微特集成电路有限公司 | Low-dropout linear voltage regulator with selectable tab external capacitance |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102830744A (en) | Linear voltage regulator employing frequency compensation | |
| CN101714817B (en) | Voltage converter with line loss compensation | |
| JP5169498B2 (en) | Current detection circuit and switching regulator including the current detection circuit | |
| CN202486643U (en) | High-bandwidth low-voltage difference linear voltage-stabilizing source, system and chip | |
| CN102789257B (en) | Low dropout regulator | |
| CN102830742B (en) | Linear stabilizer with low pressure difference | |
| CN105138062B (en) | Improve the system of low pressure difference linear voltage regulator load regulation | |
| CN102289243B (en) | Complementary metal oxide semiconductor (CMOS) band gap reference source | |
| CN109164861A (en) | A kind of low pressure difference linear voltage regulator of fast transient response | |
| CN207488871U (en) | A kind of CMOS low pressure difference linear voltage regulators using novel buffer | |
| CN102495656A (en) | Low dropout linear regulator | |
| CN202887038U (en) | Linear voltage regulator for frequency compensation | |
| CN108508958B (en) | Pseudo-digital low dropout linear regulator and power management chip | |
| CN1980027B (en) | Switching regulator | |
| CN107102680A (en) | A kind of low noise low pressure difference linear voltage regulator | |
| CN106155172A (en) | A kind of have the start-up circuit without overshoot characteristics and band-gap reference circuit | |
| CN202067171U (en) | Low dropout linear regulator | |
| CN202362691U (en) | Low dropout linear regulator | |
| CN100508370C (en) | Source follower and its stable current feedback circuit | |
| CN108566165B (en) | Control circuit, power amplification circuit and control method | |
| CN103176494A (en) | Voltage-controlled zero compensating circuit | |
| CN104360707B (en) | A kind of temperature independent non-linear ramp compensating circuit | |
| CN202817742U (en) | Overcurrent protection circuit | |
| CN103713679A (en) | LDO (Low Dropout Regulator)circuit based on discrete components | |
| CN105807831A (en) | Linear voltage regulator and linear voltage stabilizing system preventing overshoot |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121219 |