CN108459649A - A kind of low-dropout regulator and multiple-way supply device of high stability - Google Patents
A kind of low-dropout regulator and multiple-way supply device of high stability Download PDFInfo
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- CN108459649A CN108459649A CN201810203355.9A CN201810203355A CN108459649A CN 108459649 A CN108459649 A CN 108459649A CN 201810203355 A CN201810203355 A CN 201810203355A CN 108459649 A CN108459649 A CN 108459649A
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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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- Automation & Control Theory (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
The present invention relates to integrated chip technology field more particularly to the low-dropout regulators and multiple-way supply device of a kind of high stability, including initial adjustment circuit, Dolby circuit, error amplifier circuit and output-stage circuit；The multiple-way supply device includes preceding level power supply, switching circuit, main low-dropout regulator, secondary low-voltage difference voltage-stablizer, and load.The present invention is improved on the basis of conventional low difference linear constant voltage regulator, has preferable stability and anti-acoustic capability；Multiple-way supply device expands the application range of low-dropout regulator, and circuit is made to have different powering modes.
Description
Technical field
The present invention relates to the low-dropout regulator of integrated chip technology field more particularly to a kind of high stability and
Multiple-way supply device.
Background technology
Consumer electronics product has become a part indispensable in people's daily life, and power management chip exists
Important duty is responsible in electronic equipment, the quality of performance has direct influence to the energy consumption of entire circuit.And power management
The type of chip is relatively more, wherein linear voltage regulator, switching regulator（DC/DC）, driving chip and Power Management Unit account for
According to more than half rivers and mountains.And in these main species, linear voltage regulator occupies the maximum market share again.Low pressure difference linearity
Voltage-stablizer is due to its high conversion efficiency, small, low noise, outward element are few, low-cost feature, becomes application at present the most
Extensive power management chip.The noise of traditional low-dropout regulator output is big, and existing Dolby circuit is complicated, power consumption
Greatly, and stability is also not good enough.Based on this, the present invention provides a kind of improved low-dropout regulators and multiple-way supply to fill
It sets.
Invention content
Big, complicated, power consumption that the purpose of the present invention is to solve low-dropout regulator output noises in the prior art
Greatly, the problem of stability difference provides a kind of low-dropout regulator and multiple-way supply device of high stability.
The present invention provides a kind of low-dropout regulators of high stability, including initial adjustment circuit, Dolby circuit, error to amplify
Device circuit and output-stage circuit；The initial adjustment circuit includes amplifier OP1 and resistance R1, R2, the normal phase input end of amplifier OP1
The reference voltage V REF is connected, output end connects one end of resistance R1, the reverse phase of the other end connection amplifier OP1 of resistance R1
One end of input terminal and resistance R2, the other end ground connection of resistance R2；The Dolby circuit includes PMOS tube P1, P2, NMOS tube N1
With current source Ic；The source electrode of the output end and PMOS tube P1 of the source electrode connection amplifier OP1 of the PMOS tube P2, drain electrode and grid
The electric current of the grid and current source Ic that are connected and connect PMOS tube P1 flows into end, the electric current outflow end ground connection of current source Ic；
The drain electrode of the grid connection PMOS tube P1 of NMOS tube N1, source electrode are grounded with drain electrode；The error amplifier circuit includes amplification
Device OP2, normal phase input end connect the drain electrode of PMOS tube P1；The output-stage circuit includes PMOS tube P3, NMOS tube N2, power
Pipe MP and current source Io and external capacitor C1；The source electrode of PMOS tube P3 connects voltage VDD, and grid is connected and connect with drain electrode
The grid of the drain electrode and power tube MP of NMOS tube N2；The output end of the grid connection amplifier OP2 of NMOS tube N2, source electrode ground connection；
The source electrode of power tube MP connects voltage VDD, and the electric current of the inverting input current source Io of drain electrode connection amplifier OP2 flows into end,
The electric current outflow end of current source Io is grounded；One end of external capacitor C1 connects the drain electrode of power tube MP and as output voltage VO UT
Output end, the other end ground connection.
The present invention also provides a kind of multiple-way supply device including above-mentioned low-dropout regulator, the multiple-way supply devices
Including：Preceding level power supply, switching circuit, main low-dropout regulator, secondary low-voltage difference voltage-stablizer, and load；Preceding level power supply
Output end connects the input terminal of switching circuit and the input terminal of main low-dropout regulator and secondary low-voltage difference voltage-stablizer, switching
Circuit output end connection main low-dropout regulator and secondary low-voltage difference voltage-stablizer input terminal, main low-dropout regulator and
The input terminal of secondary low-voltage difference voltage-stablizer is all connected with load.
The low-dropout regulator and multiple-way supply device of a kind of high stability provided by the present invention, efficiently solve
The problem that low-dropout regulator noise is big, stability is poor in the prior art, on the basis of conventional low difference linear constant voltage regulator into
Row improves, and has preferable stability and anti-acoustic capability；Multiple-way supply device expands the application range of low-dropout regulator, makes
Circuit has different powering modes.
Description of the drawings
Fig. 1 is a kind of low-dropout regulator and multiple-way supply device circuit structure of high stability provided by the invention
Figure.
Fig. 2 is a kind of simulation result diagram of the low-dropout regulator output stability of high stability provided by the invention.
Fig. 3 is a kind of electrical block diagram of multiple-way supply device provided by the invention.
Specific implementation mode
The present invention provides a kind of low-dropout regulator of high stability and multiple-way supply devices, to make the mesh of the present invention
, technical solution and advantage it is clearer, clear, the present invention is described in more detail for the embodiment that develops simultaneously referring to the drawings.
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
Figure of description 1 is a kind of low-dropout regulator circuit structure diagram of high stability provided by the invention.Such as 1 figure institute
Show（Since reference voltage generating circuit, electric current source generating circuit, amplifier circuit are not the key points of the present invention, and this
Field technology personnel can obtain from the prior art, therefore not do emphasis elaboration in the present embodiment）, a kind of high stability it is low
Pressure difference voltage-stablizer, including initial adjustment circuit, Dolby circuit, error amplifier circuit and output-stage circuit；The initial adjustment circuit includes
The normal phase input end of amplifier OP1 and resistance R1, R2, amplifier OP1 connect the reference voltage V REF, and output end connects resistance
One end of R1, one end of the inverting input and resistance R2 of the other end connection amplifier OP1 of resistance R1, the other end of resistance R2
Ground connection；The Dolby circuit includes PMOS tube P1, P2, and NMOS tube N1 and current source Ic, the breadth length ratio of PMOS tube P1, P2 are
100:1；The source electrode of the output end and PMOS tube P1 of the source electrode connection amplifier OP1 of the PMOS tube P2, drain electrode are connected with grid
And the electric current for the grid and current source Ic for connecting PMOS tube P1 flows into end, the electric current outflow end ground connection of current source Ic, current source
Size those skilled in the art of Ic can be adjusted according to actual needs, for example, may be configured as 1nA；The grid of NMOS tube N1
Pole connects the drain electrode of PMOS tube P1, and source electrode is grounded with drain electrode；The error amplifier circuit includes amplifier OP2, positive
Input terminal connects the drain electrode of PMOS tube P1；The output-stage circuit includes PMOS tube P3, NMOS tube N2, power tube MP and current source
Io and external capacitor C1；The source electrode of PMOS tube P3 connects voltage VDD, and grid is connected with drain electrode and connect the drain electrode of NMOS tube N2
With the grid of power tube MP；The output end of the grid connection amplifier OP2 of NMOS tube N2, source electrode ground connection；The source electrode of power tube MP
Voltage VDD is connected, the electric current of the inverting input current source Io of drain electrode connection amplifier OP2 flows into end, the electric current of current source Io
Outflow end is grounded；One end of external capacitor C1 connects the drain electrode of power tube MP and as the output end of output voltage VO UT, another
End ground connection.
Foregoing circuit is compared with the low-dropout regulator of traditional structure, by setting initial adjustment circuit and Dolby circuit, and
Two metal-oxide-semiconductors being connected are additionally arranged between error amplifier and power tube, to allow the grid voltage of power tube with electricity
It presses the variation of VDD and changes, effectively reduce output noise, and there is preferable stability, the simulation result of stability is such as
Shown in Fig. 2.
The present invention also provides a kind of multiple-way supply devices including above-mentioned low-dropout regulator, as shown in figure 3, described more
Road includes for electric installation：Preceding level power supply, switching circuit, main low-dropout regulator, secondary low-voltage difference voltage-stablizer, and load；
The input terminal of the output end connection switching circuit of preceding level power supply and main low-dropout regulator and secondary low-voltage difference voltage-stablizer
Input terminal, and provide power supply, the output of switching circuit for switching circuit, main low-dropout regulator and secondary low-voltage difference voltage-stablizer
The input terminal of end connection main low-dropout regulator and secondary low-voltage difference voltage-stablizer, and main low voltage difference is controlled according to control signal
Voltage-stablizer and secondary low-voltage difference voltage-stablizer power on order, to expand the application range of low-dropout regulator, main low pressure
The input terminal of poor voltage-stablizer and secondary low-voltage difference voltage-stablizer is all connected with load.
It should be understood that the application of the present invention is not limited to the above for those of ordinary skills can
With improvement or transformation based on the above description, all these modifications and variations should all belong to the guarantor of appended claims of the present invention
Protect range.
Claims (2)
1. a kind of low-dropout regulator of high stability, which is characterized in that including initial adjustment circuit, Dolby circuit, error amplifier
Circuit and output-stage circuit；The initial adjustment circuit includes amplifier OP1 and resistance R1, R2, and the normal phase input end of amplifier OP1 connects
The reference voltage V REF is met, output end connects one end of resistance R1, and the reverse phase of the other end connection amplifier OP1 of resistance R1 is defeated
Enter the one end at end and resistance R2, the other end ground connection of resistance R2；The Dolby circuit includes PMOS tube P1, P2, NMOS tube N1 and
Current source Ic；The source electrode of the output end and PMOS tube P1 of the source electrode connection amplifier OP1 of the PMOS tube P2, drain electrode and grid phase
The electric current of the grid and current source Ic that connect and connect PMOS tube P1 flows into end, the electric current outflow end ground connection of current source Ic；NMOS
The drain electrode of the grid connection PMOS tube P1 of pipe N1, source electrode are grounded with drain electrode；The error amplifier circuit includes amplifier
OP2, normal phase input end connect the drain electrode of PMOS tube P1；The output-stage circuit includes PMOS tube P3, NMOS tube N2, power tube
MP and current source Io and external capacitor C1；The source electrode of PMOS tube P3 connects voltage VDD, and grid is connected with drain electrode and connect NMOS
The grid of the drain electrode and power tube MP of pipe N2；The output end of the grid connection amplifier OP2 of NMOS tube N2, source electrode ground connection；Power
The source electrode of pipe MP connects voltage VDD, and the electric current of the inverting input current source Io of drain electrode connection amplifier OP2 flows into end, electric current
The electric current outflow end of source Io is grounded；One end of external capacitor C1 connects the drain electrode of power tube MP and as the defeated of output voltage VO UT
Outlet, other end ground connection.
2. a kind of multiple-way supply device including low-dropout regulator described in claim 1, which is characterized in that the multichannel supplies
Electric installation includes：Preceding level power supply, switching circuit, main low-dropout regulator, secondary low-voltage difference voltage-stablizer, and load；Prime
The input of the input terminal and main low-dropout regulator and secondary low-voltage difference voltage-stablizer of the output end connection switching circuit of power supply
End, the input terminal of output end connection the main low-dropout regulator and secondary low-voltage difference voltage-stablizer of switching circuit, main low voltage difference
The input terminal of voltage-stablizer and secondary low-voltage difference voltage-stablizer is all connected with load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810203355.9A CN108459649A (en) | 2018-03-13 | 2018-03-13 | A kind of low-dropout regulator and multiple-way supply device of high stability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810203355.9A CN108459649A (en) | 2018-03-13 | 2018-03-13 | A kind of low-dropout regulator and multiple-way supply device of high stability |
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| Publication Number | Publication Date |
|---|---|
| CN108459649A true CN108459649A (en) | 2018-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810203355.9A Pending CN108459649A (en) | 2018-03-13 | 2018-03-13 | A kind of low-dropout regulator and multiple-way supply device of high stability |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6522114B1 (en) * | 2001-12-10 | 2003-02-18 | Koninklijke Philips Electronics N.V. | Noise reduction architecture for low dropout voltage regulators |
| US7397226B1 (en) * | 2005-01-13 | 2008-07-08 | National Semiconductor Corporation | Low noise, low power, fast startup, and low drop-out voltage regulator |
| CN103309389A (en) * | 2012-03-12 | 2013-09-18 | 精工电子有限公司 | Low pass filter circuit and voltage regulator |
| CN103885518A (en) * | 2014-03-26 | 2014-06-25 | 常州矽能电子科技有限公司 | Small-area and ultralow-noise LDO |
| CN106444949A (en) * | 2016-12-16 | 2017-02-22 | 电子科技大学 | Low-noise quick-start low-dropout linear regulator |
| CN107272797A (en) * | 2016-04-07 | 2017-10-20 | 中芯国际集成电路制造(上海)有限公司 | LDO power-on and power-off time sequence control circuit and electric supply installation |
-
2018
- 2018-03-13 CN CN201810203355.9A patent/CN108459649A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6522114B1 (en) * | 2001-12-10 | 2003-02-18 | Koninklijke Philips Electronics N.V. | Noise reduction architecture for low dropout voltage regulators |
| US7397226B1 (en) * | 2005-01-13 | 2008-07-08 | National Semiconductor Corporation | Low noise, low power, fast startup, and low drop-out voltage regulator |
| CN103309389A (en) * | 2012-03-12 | 2013-09-18 | 精工电子有限公司 | Low pass filter circuit and voltage regulator |
| CN103885518A (en) * | 2014-03-26 | 2014-06-25 | 常州矽能电子科技有限公司 | Small-area and ultralow-noise LDO |
| CN107272797A (en) * | 2016-04-07 | 2017-10-20 | 中芯国际集成电路制造(上海)有限公司 | LDO power-on and power-off time sequence control circuit and electric supply installation |
| CN106444949A (en) * | 2016-12-16 | 2017-02-22 | 电子科技大学 | Low-noise quick-start low-dropout linear regulator |
Non-Patent Citations (1)
| Title |
|---|
| 任兵兵 等: ""用于RFID阅读器的低噪声高电源抑制比LDO"", 《微电子学》 * |
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Application publication date: 20180828 |