CN104331112A - Low dropout linear regulator and soft starting circuit thereof - Google Patents
Low dropout linear regulator and soft starting circuit thereof Download PDFInfo
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- CN104331112A CN104331112A CN201310309159.7A CN201310309159A CN104331112A CN 104331112 A CN104331112 A CN 104331112A CN 201310309159 A CN201310309159 A CN 201310309159A CN 104331112 A CN104331112 A CN 104331112A
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Abstract
The invention belongs to the technical field of power source voltage stabilizing treatment, and provides a low dropout linear regulator and a soft starting circuit thereof. The low dropout linear regulator comprises the soft starting circuit which adopts a ramp voltage production module and a voltage selection module. The low dropout linear regulator has the advantages that the structure of the whole soft starting circuit is simple, and the implementation is easy; during circuit integration, the occupation area of a chip is smaller; the ramp voltage production module is used for gradually boosting the voltage from zero to output the ramp voltage, and the voltage selection module is used for selecting the smaller one from the fixed reference voltage and the ramp voltage as the reference voltage of the low dropout linear regulator, so the voltage outputted by the soft starting circuit is smoothly converted between the fixed reference voltage and the ramp voltage, the minimum voltage value is maintained, and the output of the low dropout linear regulator does not generate the overshoot voltage.
Description
Technical field
The invention belongs to power supply voltage stabilizing processing technology field, particularly relate to a kind of low pressure difference linear voltage regulator and soft starting circuit thereof.
Background technology
Low pressure difference linear voltage regulator (LDO, Low-dropout Regulator) is a very important power management module, and it is widely used in handheld device and portable type electronic product.To in the design of LDO, must be noted that when power supply electrifying, the power tube of LDO can produce very large surge current, much larger times of the maximum load current that this surge current exports under stable case than LDO, so just easily damage its relevant components and parts, even burn LDO chip.In order to head it off, LDO needs to realize the surge current that soft start produces to control power tube when powering on, thus guarantees that LDO chip and inner related device thereof do not suffer damage or burn.
In the prior art, the soft starting mode of LDO can be adopt current-limiting function to realize soft start roughly, so both overcurrent protection function can be realized, the surge current produced when soft start powers on control LDO can be realized again, but shortcoming is it can only be limited in set maximum current by the output current of LDO in a bit of time when just powering on, can not continue accurately to control its output current, and set maximum current is traditionally arranged to be LDO and normally works about 2 times of the maximum current that can export, this will cause needs export comparatively large load current time, set maximum current also can be relatively large, thus be unfavorable for realizing soft start.For this problem, prior art further provides another kind of LDO soft starting mode, it is zero according to the feedback voltage of LDO and initial voltage and the grid of the power tube of ramp voltage control LDO that slowly climbs of voltage, thus can control the output current of its LDO more accurately.Although to adopt designed by this soft starting mode soft starting circuit out can the output current of accurately control LDO, but all there is circuit structure complexity, need when circuit is integrated to take larger chip area, and at ramp voltage when rising to close to fixed reference potential, easily make the output terminal of LDO produce a very large overshoot voltage because voltage commutation circuit design is not good enough, LDO can be made so all to there is larger damage risk to self and load in actual applications.
In sum, there is circuit structure complexity in prior art, needs take larger chip area and increase cost when circuit is integrated, and easily make the output terminal of LDO produce the problem of overshoot voltage.
Summary of the invention
The object of the present invention is to provide a kind of soft starting circuit of low pressure difference linear voltage regulator, the circuit structure being intended to solve existing for prior art is complicated, need when circuit is integrated take larger chip area and increase cost, and easily make the output terminal of LDO produce the problem of overshoot voltage.
The present invention is achieved in that a kind of soft starting circuit of low pressure difference linear voltage regulator, and described soft starting circuit comprises:
First control end and the second control end access the first mutually anti-phase enable control signal and the second enable control signal respectively, power end access direct supply, termination equipotential ground, ground, and from voltage be zero progressively boosted voltage to export the ramp voltage generation module of ramp voltage;
First input end access fixed reference potential, second input end connects the output terminal of ramp voltage generation module, output terminal exports the reference voltage of described low pressure difference linear voltage regulator, to select in described fixed reference potential and described ramp voltage voltage reckling as the voltage selection module of described reference voltage.
Present invention also offers a kind of low pressure difference linear voltage regulator comprising above-mentioned soft starting circuit.
The present invention by adopting the soft starting circuit comprising ramp voltage generation module and voltage selection module in low pressure difference linear voltage regulator, first control end of ramp voltage generation module and the second control end access two anti-phase enable control signals respectively, power end access direct supply, termination equipotential ground, ground, the first input end access fixed reference potential of voltage selection module, second input end connects the output terminal of ramp voltage generation module, output terminal exports the reference output voltage of low pressure difference linear voltage regulator, the structure of whole soft starting circuit is simple, be easy to realize, less chip area is taken when circuit is integrated, and by ramp voltage generation module from voltage be zero progressively boosted voltage to export ramp voltage, and to select in described fixed reference potential and described ramp voltage voltage reckling as the reference voltage of low pressure difference linear voltage regulator by voltage selection module, and then the voltage making soft starting circuit export smoothly is changed between the two in described fixed reference potential and described ramp voltage and keeps magnitude of voltage minimum, thus make the output of low pressure difference linear voltage regulator produce overshoot voltage.
Accompanying drawing explanation
Fig. 1 is the function structure chart of the soft starting circuit of the low pressure difference linear voltage regulator that the embodiment of the present invention provides;
Fig. 2 is the exemplary circuit structural drawing of the soft starting circuit of the low pressure difference linear voltage regulator that the embodiment of the present invention provides;
Fig. 3 be the low pressure difference linear voltage regulator that the embodiment of the present invention provides soft starting circuit involved by select the structural representation of module with error amplifier common voltage;
Fig. 4 be the low pressure difference linear voltage regulator that the embodiment of the present invention provides soft starting circuit involved by select the exemplary circuit structural drawing of module with error amplifier common voltage;
Fig. 5 is the signal waveform graph of a relation involved by soft starting circuit of the low pressure difference linear voltage regulator that the embodiment of the present invention provides.
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.
The present invention by adopting the soft starting circuit comprising ramp voltage generation module and voltage selection module in low pressure difference linear voltage regulator, first control end of ramp voltage generation module and the second control end access two anti-phase enable control signals respectively, power end access direct supply, termination equipotential ground, ground, the first input end access fixed reference potential of voltage selection module, second input end connects the output terminal of ramp voltage generation module, output terminal exports the reference output voltage of low pressure difference linear voltage regulator, the structure of whole soft starting circuit is simple, be easy to realize, less chip area is taken when circuit is integrated, and by ramp voltage generation module from voltage be zero progressively boosted voltage to export ramp voltage, and by voltage reckling in voltage selection module selection fixed reference potential and ramp voltage as the reference voltage of low pressure difference linear voltage regulator, and then the voltage making soft starting circuit export smoothly is changed between the two in fixed reference potential and ramp voltage and keeps magnitude of voltage minimum, thus make the output of low pressure difference linear voltage regulator produce overshoot voltage.
Fig. 1 shows the modular structure of the soft starting circuit of the low pressure difference linear voltage regulator that the embodiment of the present invention provides, and for convenience of explanation, illustrate only part related to the present invention, details are as follows:
The soft starting circuit of the low pressure difference linear voltage regulator that the embodiment of the present invention provides comprises:
First control end and the second control end access the first mutually anti-phase enable control signal EN and the second enable control signal EN_N respectively, power end access direct supply VDD, termination equipotential ground, ground, and from voltage be zero progressively boosted voltage to export the ramp voltage generation module 100 of ramp voltage VRMP;
First input end access fixed reference potential VREF, second input end connects the output terminal of ramp voltage generation module 100, output terminal exports the reference voltage VRO of low pressure difference linear voltage regulator, and in selection fixed reference potential VREF and ramp voltage VRMP, voltage reckling is as the voltage selection module 200 of the reference voltage VRO of low pressure difference linear voltage regulator.
Further, as shown in Figure 2, ramp voltage generation module 100 comprises:
PMOS power tube Mp8, PMOS power tube Mp9, PMOS power tube Mp10, PMOS power tube Mp11, current source IB, NMOS power tube Mn5 and electric capacity C1;
The grid of PMOS power tube Mp8 is the first control end of ramp voltage generation module 100, the common contact of the source electrode of the source electrode of PMOS power tube Mp8 and the source electrode of PMOS power tube Mp9 and PMOS power tube Mp10 is the power end of ramp voltage generation module 100, the drain electrode of PMOS power tube Mp8 and the grid of PMOS power tube Mp10, the grid of PMOS power tube Mp9 and drain electrode are connected to the source electrode of PMOS power tube Mp11 altogether, the common contact of the grid of PMOS power tube Mp11 and the grid of NMOS power tube Mn5 is the second control end of ramp voltage generation module 100, the input end of current source IB connects the drain electrode of PMOS power tube Mp11, the common contact of the drain electrode of the drain electrode of NMOS power tube Mn5 and the first end of electric capacity C1 and PMOS power tube Mp10 is the output terminal of ramp voltage generation module 100, the output terminal of current source IB and the common contact of the source electrode of NMOS power tube Mn5 and second end of electric capacity C1 are the ground end of ramp voltage generation module 100.
In order to make the structure of low pressure difference linear voltage regulator more simple and be convenient to realize, as shown in Figure 3, the error amplifier common voltage in above-mentioned soft starting circuit and low pressure difference linear voltage regulator selects module 200, and error amplifier comprises:
Current source I1, PMOS power tube Mp3, PMOS power tube Mp4, PMOS power tube Mp5, PMOS power tube Mp6, PMOS power tube Mp7, NMOS power tube Mn1, NMOS power tube Mn2, NMOS power tube Mn3, NMOS power tube Mn4 and voltage selection module 200;
The input end of current source I1 and the drain and gate of PMOS power tube Mp5 are connected to the grid of PMOS power tube Mp4 altogether, the source electrode of PMOS power tube Mp4 and the source electrode of PMOS power tube Mp5, the source electrode of PMOS power tube Mp6 and the source electrode of PMOS power tube Mp7 are connected to direct supply VDD altogether, the drain electrode of PMOS power tube Mp4 and the power end of voltage selection module 200 are connected to the source electrode of PMOS power tube Mp3 altogether, the grid access dividing potential drop feedback voltage V FB(of PMOS power tube Mp3 its be that the output voltage of sampling resistor to low pressure difference linear voltage regulator is sampled obtained), grid and the drain electrode of PMOS power tube Mp6 are connected to the drain electrode of NMOS power tube Mn1 altogether with the grid of PMOS power tube Mp7, the drain electrode of PMOS power tube Mp7 and the drain electrode of NMOS power tube Mn2 meet the output terminal VEA_OUT as error amplifier altogether, the grid of NMOS power tube Mn1 and the grid of NMOS power tube Mn2 connect altogether and access the second control signal VBN2, the source electrode of NMOS power tube Mn1 and the drain electrode of PMOS power tube Mp3 are connected to the drain electrode of NMOS power tube Mn3 altogether, the source electrode of NMOS power tube Mn2 and the output terminal of voltage selection module 200 are connected to the drain electrode of NMOS power tube Mn4 altogether, the grid of NMOS power tube Mn3 and the grid of NMOS power tube Mn4 connect altogether and access the first control signal VBN1, the source electrode of the output terminal of current source I1 and the source electrode of NMOS power tube Mn3 and NMOS power tube Mn4 is connected to equipotential ground altogether.
Further, as shown in Figure 4, voltage selection module 200 comprises PMOS power tube Mp1 and PMOS power tube Mp2, the grid of PMOS power tube Mp1 and the grid of PMOS power tube Mp2 are respectively first input end and second input end of voltage selection module 200, the common contact of the source electrode of PMOS power tube Mp1 and the source electrode of PMOS power tube Mp2 is the power end of voltage selection module 200, and the common contact of the drain electrode of PMOS power tube Mp1 and the drain electrode of PMOS power tube Mp2 is the output terminal of voltage selection module 200.
Below in conjunction with principle of work, above-mentioned soft starting circuit is described further:
In ramp voltage generation module 100, the break-make of the first enable control signal EN and the second enable control signal EN_N control PMOS power tube Mp8 and NMOS power tube Mn5 respectively, by NMOS power tube Mn5 discharging to guarantee that the original state of ramp voltage VRMP is by no-voltage to electric capacity C1 before powering at every turn, PMOS power tube Mp9 and PMOS power tube Mp10 forms current mirror to start when the first enable control signal EN becomes 1 to charge to produce ramp voltage VRMP to electric capacity C1.In order to make the process long enough of generation ramp voltage VRMP, and the electric capacity C1 that employing electric capacity is less is with saving chip area as far as possible, then need to arrange very little by the charging current of electric capacity C1, so the ratio (as N:1) of PMOS power tube Mp9 and PMOS power tube Mp10 suitably will be designed.For voltage selection module 200, it compares from once powering on fixed reference potential VREF and ramp voltage VRMP, and both selecting, middle voltage reckling (fixed reference potential VREF or ramp voltage VRMP) exports as the reference voltage VRO of low pressure difference linear voltage regulator.
According to above-mentioned principle of work, Fig. 5 shows the first enable control signal EN, fixed reference potential VREF, the waveform relationship of ramp voltage VRMP and reference voltage VRO, when the first enable control signal EN becomes 1 from 0, PMOS power tube Mp9 in ramp voltage generation module 100 and PMOS power tube current mirror that Mp10 forms start to charge to electric capacity C1, and then a generation original state is the ramp voltage VRMP that zero beginning is progressively boosted, then compared by voltage selection module 200 couples of fixed reference potential VREF and ramp voltage VRMP and the ramp voltage VRMP selecting voltage less as the reference voltage VRO of LDO, be increased to fixed reference potential VREF makes both waveforms intersect (some P as shown in Figure 5) from ramp voltage VRMP, voltage selection module 200 will select fixed reference potential VREF as the reference voltage VRO of LDO, thus achieve and smoothly change output voltage, would not make like this to produce overshoot voltage in the output voltage of LDO.
Soft starting circuit and error amplifier common voltage are selected to the part of module 200, as shown in Figure 4, error amplifier comprises PMOS power tube Mp1 and PMOS power tube Mp2, relative to the typical error amplifier of tradition, above-mentioned error amplifier is in fact just many PMOS power tube Mp2, the error amplifier function being similar to three end inputs can either be realized like this in LDO, PMOS power tube Mp1 and PMOS power tube Mp2 can be formed voltage selection module 200 to realize the selection of minimum voltage again, thus the structure of LDO can be simplified further, and be easy to realize.And in the error amplifier shown in Fig. 4, PMOS power tube Mp4 and PMOS power tube Mp5 form current mirror for error amplifier provides tail current, and the grid of the grid of PMOS power tube Mp1, the grid of PMOS power tube Mp2 and PMOS power tube Mp3 is as three input ends of error amplifier.
Present invention also offers a kind of low pressure difference linear voltage regulator comprising above-mentioned soft starting circuit.
The present invention by adopting the soft starting circuit comprising ramp voltage generation module and voltage selection module in low pressure difference linear voltage regulator, first control end of ramp voltage generation module and the second control end access two anti-phase enable control signals respectively, power end access direct supply, termination equipotential ground, ground, the first input end access fixed reference potential of voltage selection module, second input end connects the output terminal of ramp voltage generation module, output terminal exports the reference output voltage of low pressure difference linear voltage regulator, the structure of whole soft starting circuit is simple, be easy to realize, less chip area is taken when circuit is integrated, and by ramp voltage generation module from voltage be zero progressively boosted voltage to export ramp voltage, and by voltage reckling in voltage selection module selection fixed reference potential and ramp voltage as the reference voltage of low pressure difference linear voltage regulator, and then the voltage making soft starting circuit export smoothly is changed between the two in fixed reference potential and ramp voltage and keeps magnitude of voltage minimum, thus make the output of low pressure difference linear voltage regulator produce overshoot voltage.
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 (5)
1. a soft starting circuit for low pressure difference linear voltage regulator, is characterized in that, described soft starting circuit comprises:
First control end and the second control end access the first mutually anti-phase enable control signal and the second enable control signal respectively, power end access direct supply, termination equipotential ground, ground, and from voltage be zero progressively boosted voltage to export the ramp voltage generation module of ramp voltage;
First input end access fixed reference potential, second input end connects the output terminal of ramp voltage generation module, output terminal exports the reference voltage of described low pressure difference linear voltage regulator, to select in described fixed reference potential and described ramp voltage voltage reckling as the voltage selection module of described reference voltage.
2. soft starting circuit as claimed in claim 1, it is characterized in that, described ramp voltage generation module comprises:
PMOS power tube Mp8, PMOS power tube Mp9, PMOS power tube Mp10, PMOS power tube Mp11, current source IB, NMOS power tube Mn5 and electric capacity C1;
The grid of described PMOS power tube Mp8 is the first control end of described ramp voltage generation module, the common contact of the source electrode of the source electrode of described PMOS power tube Mp8 and the source electrode of described PMOS power tube Mp9 and described PMOS power tube Mp10 is the power end of described ramp voltage generation module, the drain electrode of described PMOS power tube Mp8 and the grid of described PMOS power tube Mp10, the grid of described PMOS power tube Mp9 and drain electrode are connected to the source electrode of described PMOS power tube Mp11 altogether, the common contact of the grid of described PMOS power tube Mp11 and the grid of described NMOS power tube Mn5 is the second control end of described ramp voltage generation module, the input end of described current source IB connects the drain electrode of described PMOS power tube Mp11, the common contact of the drain electrode of the drain electrode of described NMOS power tube Mn5 and the first end of described electric capacity C1 and described PMOS power tube Mp10 is the output terminal of described ramp voltage generation module, the output terminal of described current source IB and the common contact of the source electrode of described NMOS power tube Mn5 and second end of described electric capacity C1 are the ground end of described ramp voltage generation module.
3. soft starting circuit as claimed in claim 1, is characterized in that, the error amplifier in described soft starting circuit and described low pressure difference linear voltage regulator shares described voltage selection module;
Described error amplifier comprises:
Current source I1, PMOS power tube Mp3, PMOS power tube Mp4, PMOS power tube Mp5, PMOS power tube Mp6, PMOS power tube Mp7, NMOS power tube Mn1, NMOS power tube Mn2, NMOS power tube Mn3, NMOS power tube Mn4 and described voltage selection module;
The input end of described current source I1 and the drain and gate of described PMOS power tube Mp5 are connected to the grid of described PMOS power tube Mp4 altogether, the source electrode of described PMOS power tube Mp4 and the source electrode of described PMOS power tube Mp5, the source electrode of described PMOS power tube Mp6 and the source electrode of described PMOS power tube Mp7 are connected to direct supply altogether, the described drain electrode of PMOS power tube Mp4 and the power end of described voltage selection module are connected to the source electrode of described PMOS power tube Mp3 altogether, the grid access dividing potential drop feedback voltage of described PMOS power tube Mp3, grid and the drain electrode of described PMOS power tube Mp6 are connected to the drain electrode of described NMOS power tube Mn1 altogether with the grid of described PMOS power tube Mp7, the drain electrode of described PMOS power tube Mp7 and the drain electrode of described NMOS power tube Mn2 connect the output terminal as described error amplifier altogether, the grid of described NMOS power tube Mn1 and the grid of described NMOS power tube Mn2 connect altogether and access the second control signal, the source electrode of described NMOS power tube Mn1 and the drain electrode of described PMOS power tube Mp3 are connected to the drain electrode of described NMOS power tube Mn3 altogether, the described source electrode of NMOS power tube Mn2 and the output terminal of described voltage selection module are connected to the drain electrode of described NMOS power tube Mn4 altogether, the grid of described NMOS power tube Mn3 and the grid of described NMOS power tube Mn4 connect altogether and access the first control signal, the source electrode of the output terminal of described current source I1 and the source electrode of described NMOS power tube Mn3 and described NMOS power tube Mn4 is connected to equipotential ground altogether.
4. soft starting circuit as claimed in claim 3, it is characterized in that, described voltage selection module comprises PMOS power tube Mp1 and PMOS power tube Mp2, the grid of described PMOS power tube Mp1 and the grid of described PMOS power tube Mp2 are respectively first input end and second input end of described voltage selection module, the common contact of the source electrode of described PMOS power tube Mp1 and the source electrode of described PMOS power tube Mp2 is the power end of described voltage selection module, the common contact of the drain electrode of described PMOS power tube Mp1 and the drain electrode of described PMOS power tube Mp2 is the output terminal of described voltage selection module.
5. a low pressure difference linear voltage regulator, is characterized in that, described low pressure difference linear voltage regulator comprises the soft starting circuit as described in any one of Claims 1-4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310309159.7A CN104331112A (en) | 2013-07-22 | 2013-07-22 | Low dropout linear regulator and soft starting circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310309159.7A CN104331112A (en) | 2013-07-22 | 2013-07-22 | Low dropout linear regulator and soft starting circuit thereof |
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| CN201310309159.7A Pending CN104331112A (en) | 2013-07-22 | 2013-07-22 | Low dropout linear regulator and soft starting circuit thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109491430A (en) * | 2017-09-12 | 2019-03-19 | 恩智浦有限公司 | Voltage modulator circuit and its method |
| CN111949060A (en) * | 2020-08-14 | 2020-11-17 | 电子科技大学 | Slow starting circuit |
| CN112363561A (en) * | 2020-11-05 | 2021-02-12 | 上海艾为电子技术股份有限公司 | Linear voltage regulator and soft start method thereof |
| CN113359931A (en) * | 2021-07-23 | 2021-09-07 | 上海艾为电子技术股份有限公司 | Linear voltage regulator and soft start method |
| CN115079762A (en) * | 2022-07-07 | 2022-09-20 | 圣邦微电子（北京）股份有限公司 | Low dropout linear regulator circuit |
| CN117075664A (en) * | 2023-07-12 | 2023-11-17 | 北京航芯微电子科技有限公司 | 1.4V-6.5V input high power supply rejection ratio ultra-low noise voltage stabilizing device and system |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWM302193U (en) * | 2006-03-16 | 2006-12-01 | Leadtrend Tech Corp | Voltage ergulator capable of avoiding input voltage drop |
| US20070030709A1 (en) * | 2005-08-05 | 2007-02-08 | Rohm Co., Ltd. | Soft start circuit, power supply unit and electric equipment |
| CN101119069A (en) * | 2006-08-01 | 2008-02-06 | 联发科技股份有限公司 | Soft-start circuit of linear voltage regulator and method thereof |
| US20090115379A1 (en) * | 2006-11-14 | 2009-05-07 | Al-Shyoukh Mohammad A | Soft-Start Circuit for Power Regulators |
| US7573252B1 (en) * | 2004-06-07 | 2009-08-11 | National Semiconductor Corporation | Soft-start reference ramp and filter circuit |
| CN101795068A (en) * | 2009-05-26 | 2010-08-04 | 杭州矽力杰半导体技术有限公司 | Switch type regulator and control method thereof |
| CN102419608A (en) * | 2011-12-07 | 2012-04-18 | 西安启芯微电子有限公司 | Soft start circuit based on feedback voltage clamping soft start signal |
| US8242760B2 (en) * | 2008-08-29 | 2012-08-14 | Ricoh Company, Ltd. | Constant-voltage circuit device |
| KR20120136449A (en) * | 2011-06-09 | 2012-12-20 | 삼성전자주식회사 | Method for operating soft start circuit and devices using the method |
| CN203422692U (en) * | 2013-07-22 | 2014-02-05 | 安凯(广州)微电子技术有限公司 | Low dropout regulator and soft start circuit of low dropout regulator |
-
2013
- 2013-07-22 CN CN201310309159.7A patent/CN104331112A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7573252B1 (en) * | 2004-06-07 | 2009-08-11 | National Semiconductor Corporation | Soft-start reference ramp and filter circuit |
| US20070030709A1 (en) * | 2005-08-05 | 2007-02-08 | Rohm Co., Ltd. | Soft start circuit, power supply unit and electric equipment |
| TWM302193U (en) * | 2006-03-16 | 2006-12-01 | Leadtrend Tech Corp | Voltage ergulator capable of avoiding input voltage drop |
| CN101119069A (en) * | 2006-08-01 | 2008-02-06 | 联发科技股份有限公司 | Soft-start circuit of linear voltage regulator and method thereof |
| US20090115379A1 (en) * | 2006-11-14 | 2009-05-07 | Al-Shyoukh Mohammad A | Soft-Start Circuit for Power Regulators |
| US8242760B2 (en) * | 2008-08-29 | 2012-08-14 | Ricoh Company, Ltd. | Constant-voltage circuit device |
| CN101795068A (en) * | 2009-05-26 | 2010-08-04 | 杭州矽力杰半导体技术有限公司 | Switch type regulator and control method thereof |
| KR20120136449A (en) * | 2011-06-09 | 2012-12-20 | 삼성전자주식회사 | Method for operating soft start circuit and devices using the method |
| CN102419608A (en) * | 2011-12-07 | 2012-04-18 | 西安启芯微电子有限公司 | Soft start circuit based on feedback voltage clamping soft start signal |
| CN203422692U (en) * | 2013-07-22 | 2014-02-05 | 安凯(广州)微电子技术有限公司 | Low dropout regulator and soft start circuit of low dropout regulator |
Non-Patent Citations (1)
| Title |
|---|
| 陈东坡 等: "带有温度补偿的高稳定性低压差线性稳压器", 《浙江大学学报》, vol. 41, no. 6, 30 June 2007 (2007-06-30) * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109491430A (en) * | 2017-09-12 | 2019-03-19 | 恩智浦有限公司 | Voltage modulator circuit and its method |
| CN109491430B (en) * | 2017-09-12 | 2022-05-06 | 恩智浦有限公司 | Voltage regulator circuit and method therefor |
| CN111949060A (en) * | 2020-08-14 | 2020-11-17 | 电子科技大学 | Slow starting circuit |
| CN112363561A (en) * | 2020-11-05 | 2021-02-12 | 上海艾为电子技术股份有限公司 | Linear voltage regulator and soft start method thereof |
| CN113359931A (en) * | 2021-07-23 | 2021-09-07 | 上海艾为电子技术股份有限公司 | Linear voltage regulator and soft start method |
| CN113359931B (en) * | 2021-07-23 | 2022-12-27 | 上海艾为电子技术股份有限公司 | Linear voltage regulator and soft start method |
| CN115079762A (en) * | 2022-07-07 | 2022-09-20 | 圣邦微电子（北京）股份有限公司 | Low dropout linear regulator circuit |
| CN115079762B (en) * | 2022-07-07 | 2024-02-06 | 圣邦微电子（北京）股份有限公司 | Low dropout linear voltage regulator circuit |
| CN117075664A (en) * | 2023-07-12 | 2023-11-17 | 北京航芯微电子科技有限公司 | 1.4V-6.5V input high power supply rejection ratio ultra-low noise voltage stabilizing device and system |
| CN117075664B (en) * | 2023-07-12 | 2024-02-20 | 北京航芯微电子科技有限公司 | 1.4V-6.5V input high power supply rejection ratio ultra-low noise voltage stabilizing device and system |
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Application publication date: 20150204 |
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