CN105373180B - Low power consumption low dropout linear regulator - Google Patents
Low power consumption low dropout linear regulator Download PDFInfo
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- CN105373180B CN105373180B CN201510589007.6A CN201510589007A CN105373180B CN 105373180 B CN105373180 B CN 105373180B CN 201510589007 A CN201510589007 A CN 201510589007A CN 105373180 B CN105373180 B CN 105373180B
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Abstract
The invention discloses a low power consumption low dropout linear regulator, comprising an error amplifier whose anode is connected with a power supply. The output end of the error amplifier is connected with the grid electrode of a MOS. The drain electrode of the MOS is connected with a current-limiting device. The source electrode of the MOS is connected with a feedback resistor. The feedback resistor is connected with the cathode of the error amplifier. The low dropout linear regulator solves problems in the prior art that voltage drop of a low dropout linear regulator is high and power consumption is high, and improves working efficiency of the low dropout linear regulator.
Description
Technical field
The invention belongs to linear voltage regulator technical field is and in particular to a kind of low pressure difference linear voltage regulator of low-power consumption.
Background technology
Low pressure difference linear voltage regulator ldo has the outstanding advantages such as the simple, low noise of structure, has extensively in various products
Application.Although traditional ldo self-limiting output circuit structure solve output voltage overshoot, and overshoot after can lead to by
The problem puncturing.But self-limiting circuit can increase the pressure drop of ldo, the power consumption of voltage-stablizer is led to increase.
Content of the invention
It is an object of the invention to provide a kind of low pressure difference linear voltage regulator of low-power consumption, solve present in prior art
The problem that the pressure drop of low pressure difference linear voltage regulator is high, power consumption is high.
1. the technical solution adopted in the present invention is, a kind of low pressure difference linear voltage regulator of low-power consumption, connects including positive pole
The error amplifier of reference power source, the output end of error amplifier is connected with the grid of mos, and the drain electrode of mos is with current-limiting apparatus even
Connect, the source electrode of mos is connected with feedback resistance, feedback resistance is connected with the negative pole of error amplifier.Current-limiting apparatus include determining whether to fill
Put, decision maker is connected with the first current mirror, the first current mirror is connected with current sampling device, the first current mirror and current sample
It is also associated with feedback device between device, between current sampling device and feedback device, be connected with the second current mirror.First electric current
Mirror is connected with the drain electrode of mos.First current mirror includes a mos pipe and the first reference power supply stream, and a mos manages as saturation fortune
Row mode or triode operational mode.The source electrode of mos is also connected with output device.
The feature of the present invention also resides in,
Wherein saturation mode of operation, the source electrode of the specially the first mos pipe and the voltage difference of grid are more than the valve of a mos pipe
Threshold voltage, and the voltage difference of the source electrode of a mos pipe and drain electrode is more than the source electrode of a mos pipe and the voltage difference of grid.
Wherein triode operational mode, the source electrode of the specially the first mos pipe and the voltage difference of grid are more than a mos pipe
Threshold voltage, and the source electrode of a mos pipe and drain voltage difference are less than the source electrode of a mos pipe and the voltage difference of grid.
Wherein in triode operational mode, the maximum output current of the first current mirror 8 is the first electric current in saturation mode of operation
2-11 times of the maximum output current of mirror 8.
The invention has the beneficial effects as follows, connect the grid of mos using error amplifier, the drain electrode of mos connects current-limiting apparatus,
It is connected with output device between the source electrode of mos and the negative pole of error amplifier；Current-limiting apparatus include decision maker, decision maker
The output voltage of output device that can be obtained by current sampling device for decision circuit cmp, decision circuit cmp and current limliting dress
The voltage difference of the sampled voltage put, judge voltage-stablizer select mode of operation；And the source electrode of mos and the negative pole of error amplifier
Between be also associated with feedback resistance；The pressure drop of voltage-stablizer can be reduced, reduce the power consumption of linear voltage regulator, improve linear voltage stabilization
The operating efficiency of device.
Brief description
Fig. 1 is a kind of circuit structure diagram of the low pressure difference linear voltage regulator of low-power consumption of the present invention.
Fig. 2 is the circuit structure diagram of current-limiting apparatus in a kind of low pressure difference linear voltage regulator of low-power consumption of the present invention.
Fig. 3 be a kind of low-power consumption of the present invention low pressure difference linear voltage regulator embodiment in current-limiting apparatus circuit connection diagram.
In figure, 1. error amplifier, 2.mos, 3. current-limiting apparatus, 4. feedback resistance, 5. output device, 6. reference power source,
7. decision maker, 8. the first current mirror, 9. current sampling device, 10. feedback device, 11. second current mirrors.
In Fig. 3, cmp is decision maker；M1-m23 is mos；Current source on the basis of i1 and i2.
Fig. 4 is a kind of output current of the low pressure difference linear voltage regulator of low-power consumption of the present invention with supply voltage and output voltage
The waveform diagram of pressure reduction.
Fig. 5 is the output current of the existing low pressure difference linear voltage regulator of the present invention with supply voltage and output voltage pressure reduction
Waveform diagram.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and detailed description.
The present invention proposes a kind of low pressure difference linear voltage regulator of low-power consumption, as shown in figure 1, including error amplifier 1, by mistake
The positive pole of difference amplifier 1 connects reference power source 6, and the input voltage of reference power source 6 is at least 2v, the output end of error amplifier 1
It is connected with the grid of mos2, the source electrode of mos2 connects output device 5, output device 5 output voltage, and the source electrode of mos2 is also connected with instead
Feed resistance 4, feedback resistance 4 is connected with the negative pole of error amplifier 1；The drain electrode of mos2 is connected with current-limiting apparatus 3.
As shown in Fig. 2 current-limiting apparatus 3 include determining whether device 7, decision maker 7 is decision circuit cmp device, decision maker 7
Output end be connected with the first current mirror 8, the first current mirror 8 is connected with current sampling device 9, and the first current mirror 8 is adopted with electric current
It is connected with feedback device 10 between sampling device 9, between feedback device 10 and current sampling device 9, be connected with the second current mirror 11；
Wherein first current mirror 8 is connected with the drain electrode of mos2.
As shown in figure 3, the first current mirror 8 includes reference current source i1, mos pipe m1-m9, wherein mos pipe m9 is a mos
Pipe, reference current source i1 is the first reference current source；Current sampling device 9 includes mos pipe m11-m14；Feedback device 10 includes
Mos pipe m15, m16, m19, m20, m22；Second current mirror 11 includes reference current source i2, mos pipe m17, m18, m21, m23.
A kind of working method of the low pressure difference linear voltage regulator of low-power consumption of the present invention is that comparator circuit cmp passes through sampling
The pressure reduction of voltage and output voltage carrys out the mode of operation of decision circuit, and comparator circuit cmp controls m7, the break-make of m15.I.e. with
The increase of output current, when the pressure reduction of supply voltage and output voltage is more than 1v, power tube m9 enters from saturation operation mode
To triode region mode of operation.Now under identical pressure reduction, power output pipe exports more electric currents, but due to current limliting dress
Put, the maximum output current of power tube is limited in 900ma.Because the comparator in decision circuit has hysteresis voltage, from
Two mode of operations to the first working mode change voltage can be less than 1v.
When the pressure reduction of supply voltage and output voltage is less than 1v, the output seln of comparator circuit cmp is low level, m7
Disconnect with m15, reference current source i1 provides the electric current of zero-temperature coefficient, current source i1 passes through m1, m2 and m5, the electric current of m6 composition
Mirror, current amplification factor is 4, is mirrored to the drain electrode of m8.The current mirror that electric current forms further through m8 and m9 is mirrored to the drain electrode of m9,
Now m9 is operated in the first mode of operation, i.e. saturation region operation pattern, and maximum output current is ipmos=77ua*4*2295
=706ma；Now m15 turns off, and feedback circuit does not work, and the maximum current of power output pipe m10 is 706ma；
When the pressure reduction of output voltage is more than 1v, the output seln of comparator is high level, m7 and m15 turns on, current source
I1 passes through m1, m2 and m3, the current mirror of m4, m5, m6 composition, and current amplification factor is 24, is mirrored to the drain electrode of m8.Electric current leads to again
The current mirror crossing m8 and m9 composition is mirrored to the drain electrode of m9, and now m9 is operated in the first mode of operation, i.e. saturation region operation pattern,
Maximum output current is ipmos=77ua*2*12*2295=4.2a；Now m15 conducting, current-limiting circuit starts, m11 and m12
Sampled output current, and pass through m13, m14 and m16 is mirrored to m22, and m22 passes through current mirror m19, and the grid voltage of m9 is improved,
Make m9 be operated in the second mode of operation, i.e. triode region mode of operation, the maximum output current of m9 is limited in 900ma.Work
Under electric current 500ma, the vds of power tube m9 is in 190.6mv.Without ldo adjustment circuit, under 500ma, vds is about
683.6mv.This structure makes dropout voltage reduce 493mv.
When output current is less than 500ma, compensation circuit startup work, reference current source i2 passes through mos pipe m17 and m18
It is mirrored to the drain electrode of m23, electric current passes through the current mirror of m21, m23 composition again, offset the electric current that m22 drain electrode is passed through, that is, in work
When electric current is less than 500ma, feedback circuit does not cause the change of m9 grid voltage.
It is illustrated in figure 4 using a kind of output current of the low pressure difference linear voltage regulator of low-power consumption of the present invention with supply voltage
With the waveform diagram of output voltage pressure reduction, when electric current is for 500ma, output pressure reduction only has 190.6mv；Fig. 5 is existing low pressure
With the waveform diagram of supply voltage and output voltage pressure reduction, wherein pressure drop is 683.6mv to the output current of difference linear constant voltage regulator.
The voltage-stablizer of the present invention can make pressure drop reduce 493mv, and then effectively reduces the power consumption of voltage-stablizer, improves operating efficiency.
Claims (4)
1. a kind of low pressure difference linear voltage regulator of low-power consumption is it is characterised in that the error including positive pole connection reference power source (6) is put
Big device (1), the output end of error amplifier (1) is connected with the grid of mos (2), and the drain electrode of mos (2) is with current-limiting apparatus (3) even
Connect, the source electrode of mos (2) is connected with feedback resistance (4), feedback resistance (4) is connected with the negative pole of error amplifier (1), current limliting fills
Put (3) and include determining whether device (7), decision maker (7) is connected with the first current mirror (8), the first current mirror (8) is filled with current sample
Put (9) to connect, between the first current mirror (8) and current sampling device (9), be also associated with feedback device (10), current sampling device
(9) it is connected with the second current mirror (11) and feedback device (10) between, the first current mirror (8) is connected with the drain electrode of mos (2), the
One current mirror (8) includes a mos pipe and the first reference power supply stream, and a mos manages as saturation mode of operation or triode fortune
Row mode, the source electrode of mos (2) is also connected with output device (5).
2. a kind of low pressure difference linear voltage regulator of low-power consumption according to claim 1 is it is characterised in that described saturation operation
Pattern, the source electrode of the specially the first mos pipe and the voltage difference of grid are more than the threshold voltage of a mos pipe, and a mos pipe
The voltage difference of source electrode and drain electrode is more than the source electrode of a mos pipe and the voltage difference of grid.
3. a kind of low pressure difference linear voltage regulator of low-power consumption according to claim 1 is it is characterised in that described triode is transported
Row mode, the source electrode of the specially the first mos pipe and the voltage difference of grid are more than the threshold voltage of a mos pipe, and mos pipe
Source electrode and drain voltage difference be less than the source electrode of a mos pipe and the voltage difference of grid.
4. the low pressure difference linear voltage regulator of any one low-power consumption according to claim 1-3 is it is characterised in that triode
In operational mode, the maximum output current of the first current mirror (8) is the maximum output of the first current mirror (8) in saturation mode of operation
2-11 times of electric current.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510589007.6A CN105373180B (en) | 2015-09-16 | 2015-09-16 | Low power consumption low dropout linear regulator |
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| CN201510589007.6A CN105373180B (en) | 2015-09-16 | 2015-09-16 | Low power consumption low dropout linear regulator |
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| CN105373180A CN105373180A (en) | 2016-03-02 |
| CN105373180B true CN105373180B (en) | 2017-01-25 |
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| CN105657915B (en) * | 2016-04-05 | 2017-12-05 | 易美芯光（北京）科技有限公司 | A kind of segmented LED drive circuit based on low pressure close pattern |
| CN107179797B (en) * | 2017-05-27 | 2018-08-21 | 上海华虹宏力半导体制造有限公司 | Linear voltage regulator |
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| CN101256421A (en) * | 2007-12-27 | 2008-09-03 | 北京中星微电子有限公司 | Current limitation circuit as well as voltage regulator and DC-DC converter including the same |
| TW201229709A (en) * | 2011-01-04 | 2012-07-16 | Faraday Tech Corp | Voltage regulator |
| CN102629147A (en) * | 2011-02-01 | 2012-08-08 | 精工电子有限公司 | Voltage regulator |
| CN202817742U (en) * | 2012-10-25 | 2013-03-20 | 佛山市顺德区瑞德电子实业有限公司 | Overcurrent protection circuit |
| CN204009654U (en) * | 2014-06-25 | 2014-12-10 | 万源市海铝科技有限公司 | For the current foldback circuit of linear voltage regulator |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6522111B2 (en) * | 2001-01-26 | 2003-02-18 | Linfinity Microelectronics | Linear voltage regulator using adaptive biasing |
| KR100608112B1 (en) * | 2004-08-27 | 2006-08-02 | 삼성전자주식회사 | Power regulator having over-current protection circuit and method of over-current protection thereof |
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- 2015-09-16 CN CN201510589007.6A patent/CN105373180B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101256421A (en) * | 2007-12-27 | 2008-09-03 | 北京中星微电子有限公司 | Current limitation circuit as well as voltage regulator and DC-DC converter including the same |
| TW201229709A (en) * | 2011-01-04 | 2012-07-16 | Faraday Tech Corp | Voltage regulator |
| CN102629147A (en) * | 2011-02-01 | 2012-08-08 | 精工电子有限公司 | Voltage regulator |
| CN202817742U (en) * | 2012-10-25 | 2013-03-20 | 佛山市顺德区瑞德电子实业有限公司 | Overcurrent protection circuit |
| CN204009654U (en) * | 2014-06-25 | 2014-12-10 | 万源市海铝科技有限公司 | For the current foldback circuit of linear voltage regulator |
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Address after: B201, zero one square, Xi'an Software Park, 72 Keji 2nd Road, high tech Zone, Xi'an City, Shaanxi Province, 710000 Patentee after: Tuoer Microelectronics Co.,Ltd. Address before: 710075 406 / 408, taibaige, Xi'an Software Park, No. 72, Keji Second Road, high tech Zone, Xi'an, Shaanxi Province Patentee before: XI'AN TUOER MICROELECTRONICS Co.,Ltd. |