CN101847928A - Quick starting circuit and method of low-noise linear regulator - Google Patents
Quick starting circuit and method of low-noise linear regulator Download PDFInfo
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- CN101847928A CN101847928A CN 201010151555 CN201010151555A CN101847928A CN 101847928 A CN101847928 A CN 101847928A CN 201010151555 CN201010151555 CN 201010151555 CN 201010151555 A CN201010151555 A CN 201010151555A CN 101847928 A CN101847928 A CN 101847928A
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Abstract
The invention discloses quick starting circuit and method of a low-noise linear regulator. The circuit comprises a threshold voltage generation module, a voltage detection and control module and a quick charging module. The method comprises the following steps of: A. electrifying a circuit, controlling the quick charging module to start by using the output of the voltage detection and control module when the reference voltage V_ref is less than threshold voltage V_th and charging a reference voltage filter capacitor by using the quick charging module to enable the reference voltage V_ref to quickly rise; and B. controlling the quick charging module to shut off by using the output of the voltage detection and control module when the reference voltage V_ref is more than threshold voltage V_th and charging the reference voltage filter capacitor by using low current of a bandgap reference circuit. The invention can ensure that the linear regulator can quickly reach the normal work state after being electrified and adjust to a final output voltage value during work. The invention is used as the quick starting circuit and the method of the lower-noise linear regulator, which are applied to an electronic system.
Description
Technical field
The present invention relates to a kind of circuit and method that powers on and start fast, especially a kind of power on fast start circuit and method that is used for low noise low-voltage drop linear adjuster.
Background technology
Low-voltage drop linear adjuster (LDO:Low Drop-out Regulator) is a very important branch of power management chip, compare with Switching Power Supply, it has that cost is low, noise is little, simple in structure, advantage such as power consumption is little, and can not introduce the problem of electromagnetic interference, so, especially be widely used in the mobile phone at portable electronic system.
As shown in Figure 1, a basic low-voltage drop linear adjuster is made up of reference voltage generation module, PMOS output element, resistance pressure-dividing network and error amplifier.The reference voltage generation module has produced one hardly with band gap (Bandgap) reference voltage of change of external conditions such as supply voltage and temperature, and this reference voltage is received the negative input end of error amplifier; Resistance pressure-dividing network is sampled to output voltage V out and is delivered to the positive input terminal of error amplifier with dividing potential drop afterwards; The output of error amplifier is received on the grid of output pmos; Load resistance RL and load capacitance CL that the output Vout chip for driving of adjuster is outer.
By derive can adjusted device output voltage be:
When the variation of condition of work and when causing that Vout changes, resistance pressure-dividing network feeds back to the variation of Vout the input of error amplifier, the corresponding conducting degree of regulating the PMOS pipe that changes takes place in the output of error amplifier, thereby adjust output voltage V out, Vout is remained unchanged under various conditions of work substantially.Whole system forms a degenerative loop, and load capacitance is used for the zero limit of bucking-out system, makes system stability.
In being applied to the system that power supply noise is had relatively high expectations, as radio circuit and high performance audio system, the general noise that adds after bandgap voltage reference earlier that a low pass filter comes the filtering band-gap reference circuit to produce, again filtered reference voltage is delivered to the input of error amplifier, thereby reduced the noise of whole adjuster output Vout.The bandwidth of low pass filter is more little, and the noise filtering effect is good more, and the output noise of Vout is just low more.In actual design, this filter generally is made up of big resistance and the outer big electric capacity of chip, its bandwidth at several Hz between the hundreds of Hz.So, can introduce very big time constant to reference voltage after adding filter, cause during the LDO electrifying startup, reference voltage need spend the settling time of very long (being generally Millisecond), increase powering on the stand-by period of LDO greatly, caused time waste.
The technical scheme of existing electrifying startup time of accelerating mainly contains following two kinds:
The electric current of scheme 1, increase band gap (Bandgap) reference voltage generating circuit, thus the electric current that filter capacitor is charged increased, reduce the charging interval.
Scheme 2, during electrifying startup, the filter resistance short circuit is reduced filter time constant.
Adopt above-mentioned technical scheme 1, can increase the power consumption of LDO itself greatly.Adopt technical scheme 2, then need to produce other control signal, the complexity of increase system control, and final still obtain toggle speed faster by the electric current that increases band-gap reference circuit itself.
Summary of the invention
In order to solve above-mentioned technical problem, the purpose of this invention is to provide a kind of fast start circuit of low-noise linear regulator of simple in structure and good stability.
Another object of the present invention provides the quick start method of the low low-noise linear regulator of a kind of cost.
The technical solution adopted for the present invention to solve the technical problems is:
The fast start circuit of low-noise linear regulator comprises:
One threshold voltage generation module, it is used to produce a threshold voltage that powers on and set up fast;
One voltage detecting and control module, the threshold voltage that described threshold voltage generation module produces and the reference voltage of linear regulator are respectively as the input signal of described voltage detecting and control module, and described voltage detecting and control module produce control signal corresponding according to the magnitude relationship of threshold voltage and reference voltage;
One quick charge module, the output of described voltage detecting and control module link to each other with the input of quick charge module and control its unlatching and shutoff, and the output of described quick charge module is connected with the reference voltage filter capacitor of linear regulator.
Further, described quick charge module is in series by a PMOS switching tube and a current-limiting resistance.
Further, described quick charge module is a PMOS switching tube.
Further, described quick charge module is the vast scale current mirror, and described vast scale current mirror at first produces a constant little electric current, concerns that by vast scale current mirror amplifies N doubly with I then.
The quick start method of low-noise linear regulator may further comprise the steps:
A, circuit power on, and reference voltage V _ ref is less than threshold voltage V_th, and voltage detecting and control module output control quick charge module are opened, and the quick charge module is the charging of reference voltage filter capacitor, reference voltage V _ ref fast rise;
B, when reference voltage V _ ref greater than threshold voltage V_th, voltage detecting and control module output control quick charge module shuts down, the charging modes of reference voltage filter capacitor changes the little electric current of band-gap reference circuit itself into and finishes.
Further, the threshold voltage V_th of described threshold voltage generation module generation is more than or equal to the final value voltage of 0.96 times of reference voltage V _ ref.
The invention has the beneficial effects as follows: circuit of the present invention only is made up of threshold voltage generation module, voltage detecting and control module, quick charge module three parts, simple in structure, chip occupying area is little, because circuit major part of the present invention is digital circuit, so circuit of the present invention can not increase the power consumption of LDO itself in the operate as normal of LDO.
Another beneficial effect of the present invention is: the quick start method of low-noise linear regulator adopts the comparator with high-gain and lag function to make linear regulator can arrive the state of operate as normal rapidly after powering on, and adjust to final output voltage values at work, precise control, good stability, the low and superior performance of cost.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the structure chart of typical low noise low-voltage drop linear adjuster;
Fig. 2 is a start-up circuit structural representation of the present invention;
Fig. 3 is an example circuit diagram of the present invention;
Fig. 4 adopts the present invention's electrifying startup simulation waveform of low-voltage drop linear adjuster later on;
Fig. 5 is the schematic diagram that the quick charge module adopts the vast scale current mirror.
Embodiment
With reference to Fig. 2, the fast start circuit of low-noise linear regulator comprises:
One threshold voltage generation module, it is used to produce a threshold voltage that powers on and set up fast;
One voltage detecting and control module, the threshold voltage that described threshold voltage generation module produces and the reference voltage of linear regulator are respectively as the input signal of described voltage detecting and control module, and described voltage detecting and control module produce control signal corresponding according to the magnitude relationship of threshold voltage and reference voltage;
One quick charge module, the output of described voltage detecting and control module link to each other with the input of quick charge module and control its unlatching and shutoff, and the output of described quick charge module is connected with the reference voltage filter capacitor of linear regulator.
Further, described quick charge module is in series by a PMOS switching tube and a current-limiting resistance.
Further, described quick charge module is a PMOS switching tube.
In original quick charge module, remove current-limiting resistance, only realize with a PMOS pipe.Current-limiting resistance plays protective circuit, and controls the effect of start-up time.
Further, described quick charge module is the vast scale current mirror, and described vast scale current mirror at first produces a constant little electric current, concerns that by vast scale current mirror amplifies N doubly with I then.
As shown in Figure 5, the current mirror of employing vast scale is controlled the size of charging current.
Produce a little electric current I in circuit, the current mirror that concerns by vast scale amplifies N doubly with I, and when starting, the closure of control switch is charged to filter capacitor with this big electric current.By the ratio of Control current mirror, just can control the size of charging current, thus the time of control charging.
The quick start method of low-noise linear regulator may further comprise the steps:
A, circuit power on, and reference voltage V _ ref is less than threshold voltage V_th, and voltage detecting and control module output control quick charge module are opened, and the quick charge module is the charging of reference voltage filter capacitor, reference voltage V _ ref fast rise;
B, when reference voltage V _ ref greater than threshold voltage V_th, voltage detecting and control module output control quick charge module shuts down, the charging modes of reference voltage filter capacitor changes the little electric current of band-gap reference circuit itself into and finishes.
Further, the threshold voltage V_th of described threshold voltage generation module generation is more than or equal to the final value voltage of 0.96 times of reference voltage V _ ref.
Fast start circuit provided by the invention mainly is made up of threshold voltage generation module, voltage detecting and control module, quick charge module three parts.As shown in Figure 2.
In above-mentioned circuit, the threshold voltage generation module mainly produces a threshold voltage V_th who is slightly less than reference voltage V _ ref and sets up fast when powering on, as the input signal of voltage detecting and control module, voltage detecting and control module produce the control signal of control quick charge module opening and closing according to the V_ref of input and the magnitude of voltage magnitude relationship of V_th respectively for threshold voltage V_th and reference voltage V _ ref.The output of quick charge module is received on the V_ref (that is top crown of filter capacitor Cbp).
Owing to adopted above-mentioned technical solution, when LDO just powers on, V_ref rises slower because V_th rises very fast, so V_ref＜V_th, this moment, voltage detecting and control module produced control signal unlatching quick-charging circuit, quick-charging circuit provides big current path from power supply to the electric capacity top crown that filter capacitor Cbp is charged, and makes that the reference voltage after filtered rises to final magnitude of voltage when approaching to stablize soon.When V_ref rises to greater than V_th, voltage detecting and control module produce control signal and close the quick charge module, the charging process of big electric current finishes, and the electric current of benchmark generation module utilization itself continues charging to filter capacitor, makes V_ref arrive final stable voltage.So, having adopted after the method for the present invention, the power up of LDO can be divided into two stages, in the starting stage that powers on, adopts the charging path of big electric current to make the output voltage of LDO be climbed to and approaches end value; And adopt the current charges of benchmark generation module itself afterwards, make the output voltage of LDO reach final value.Improve the speed that powers on of LDO greatly, saved the stand-by period of system.And when LDO power on finish after, start-up circuit does not influence the operate as normal of LDO, and does not consume any power consumption.In addition, can adjust the power-on time of LDO easily by the size of adjusting fast charging current according to requirement of actual application in this invention.
Because industry is the electrifying startup time of definition LDO, generally calculate from 96% time that is spent that the 0V rising reaches end value, so can select V_th 〉=0.96 * V_ref with the output voltage V out of LDO
FinalMake to reach normal operating state when LDO powers on fast that slowly reach final magnitude of voltage in working order then, V_reffinal is the final value of V_ref here.
Fig. 3 is the example schematic according to the fast start circuit of low-noise linear regulator of the present invention.Comprised the band-gap reference circuit of a high Power Supply Rejection Ratio (PSRR:Power-Supply RejectionRatio) among the figure, the threshold voltage generation module is integrated in this band-gap reference circuit, and threshold voltage V_th obtains by the electric resistance partial pressure form of V_bandgap.Voltage detecting and control module are made of a comparator; here use hysteresis comparator to make that operation is more stable; M1～M6 forms the buffer of band enable signal; be used for the output signal of comparator is carried out further shaping and buffering; and the quick charge module is made of a PMOS switch M7 and a current-limiting resistance Rc; current-limiting resistance Rc not only is used for the destruction that the device of protective circuit is not subjected to big electric current, and can adjust the start-up time of linear regulator easily.
The concrete working method of this circuit is as described below, and at first, as the enabling signal PWR of LDO when being low level, LDO is in the mode of operation of shutoff, and V_ref and Vout are 0V.When system draws high the PWR signal and starts LDO, band-gap reference circuit is started working, V_ref and V_th are slowly begun to rise by 0V, V_ref rise slower owing to need drive the filter with very big RC time constant, so incipient the time, V_ref is less than V_th, this moment, hysteresis comparator was output as low level, PMOS switch M7 conducting, open quick-charging circuit, big electric current I _ large charges to filter capacitor Cbp by PMOS switch M7 and current-limiting resistance Rc, because this charging current is bigger, so the V_ref fast rise.When being charged to V_ref greater than V_th, the output of comparator is overturn, and turn-offs PMOS switch M7 and disconnects quick-charging circuit.Little electric current I _ the small that filter capacitor charging is changed into band-gap reference circuit itself finishes, and makes V_ref finally reach stable final value, thereby finishes the whole process that powers on.
Simulation waveform when Fig. 4 is this circuit working, when the PWR signal when low level is drawn high, just begun circuit working in 1 stage, band-gap reference circuit is started working, V_ref and V_th slowly rise, and slower but V_ref rises, comparator is output as high level.Then be the stage 2, when V_th rose to greater than V_ref, comparator output became low level, and quick-charging circuit is opened, V_ref and Vout fast rise.Stage 3, when V_ref rises to greater than V_th, the comparator output switching activity, the quick charge process finishes, and V_ref and Vout become slow rising by fast rise, reach stable final magnitude of voltage at last, whole electrifying startup process is approximately the time of 30us, has saved the time greatly.
Module Division is not necessarily identical with the present invention in the replacement scheme, but perhaps it can produce threshold voltage by diverse ways, and accelerates reference voltage settling time according to threshold voltage and reference voltage size.The method that produces threshold voltage can obtain by different forms such as electric resistance partial pressure, diode voltage, metal-oxide-semiconductor dividing potential drops.
More than be that preferable enforcement of the present invention is specified, but the invention is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent variations or replacement under the prerequisite of spirit of the present invention, modification that these are equal to or replacement all are included in the application's claim institute restricted portion.
Claims (6)
1. the fast start circuit of low-noise linear regulator is characterized in that: comprising:
One threshold voltage generation module, it is used to produce a threshold voltage that powers on and set up fast;
One voltage detecting and control module, the threshold voltage that described threshold voltage generation module produces and the reference voltage of linear regulator are respectively as the input signal of described voltage detecting and control module, and described voltage detecting and control module produce control signal corresponding according to the magnitude relationship of threshold voltage and reference voltage;
One quick charge module, the output of described voltage detecting and control module link to each other with the input of quick charge module and control its unlatching and shutoff, and the output of described quick charge module is connected with the reference voltage filter capacitor of linear regulator.
2. the fast start circuit of low-noise linear regulator according to claim 1, it is characterized in that: described quick charge module is in series by a PMOS switching tube and a current-limiting resistance.
3. the fast start circuit of low-noise linear regulator according to claim 1, it is characterized in that: described quick charge module is a PMOS switching tube.
4. the fast start circuit of low-noise linear regulator according to claim 1, it is characterized in that: described quick charge module is the vast scale current mirror, described vast scale current mirror at first produces a constant little electric current, concerns that by vast scale current mirror amplifies N doubly with I then.
5. the quick start method of low-noise linear regulator is characterized in that: may further comprise the steps:
A, circuit power on, and reference voltage V _ ref is less than threshold voltage V_th, and voltage detecting and control module output control quick charge module are opened, and the quick charge module is the charging of reference voltage filter capacitor, reference voltage V _ ref fast rise;
B, when reference voltage V _ ref greater than threshold voltage V_th, voltage detecting and control module output control quick charge module shuts down, the charging modes of reference voltage filter capacitor changes the little electric current of band-gap reference circuit itself into and finishes.
6. the quick start method of low-noise linear regulator according to claim 5 is characterized in that: the threshold voltage V_th that described threshold voltage generation module produces is more than or equal to the final value voltage of 0.96 times of reference voltage V _ ref.
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| CN 201010151555 CN101847928A (en) | 2010-04-14 | 2010-04-14 | Quick starting circuit and method of low-noise linear regulator |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104393760A (en) * | 2014-11-27 | 2015-03-04 | 中国兵器工业集团第二一四研究所苏州研发中心 | Positive-negative output low dropout adjusting circuit with short-circuit protection function |
| CN105099159A (en) * | 2015-08-21 | 2015-11-25 | 电子科技大学 | Quick starting circuit for DC-DC converter |
| CN105337499A (en) * | 2015-11-24 | 2016-02-17 | 中国电子科技集团公司第五十五研究所 | Underloading current compensation circuit of cuk type switching convertor |
| CN107294379A (en) * | 2017-08-12 | 2017-10-24 | 厦门奇力微电子有限公司 | The linear voltage-stabilizing circuit and method of High Pressure Difference exchange input |
| CN107742981A (en) * | 2017-08-02 | 2018-02-27 | 宁德时代新能源科技股份有限公司 | Low-voltage power supply circuit, battery sampling unit and vehicle power supply battery |
| CN107994763A (en) * | 2018-01-09 | 2018-05-04 | 深圳市海鸿微电子科技有限公司 | A kind of Switching Power Supply and its control circuit, the activation system of controller |
| CN108874010A (en) * | 2018-09-06 | 2018-11-23 | 深圳市中微半导体有限公司 | A kind of strong anti-interference LDO module and anti-interference touch detection circuit |
| CN109976432A (en) * | 2017-11-15 | 2019-07-05 | 英飞凌科技股份有限公司 | Feed circuit for regulating loop |
| CN111313674A (en) * | 2019-11-06 | 2020-06-19 | 北京比特大陆科技有限公司 | Power-on control circuit and electronic equipment with same |
| CN111698809A (en) * | 2019-03-13 | 2020-09-22 | 益力半导体股份有限公司 | Low-dimming fast driving system, method and controller |
| WO2021068103A1 (en) * | 2019-10-08 | 2021-04-15 | Alibaba Group Holding Limited | System and method for efficient power delivery |
| CN112684841A (en) * | 2019-10-18 | 2021-04-20 | 圣邦微电子（北京）股份有限公司 | Low dropout regulator with high power supply rejection ratio |
| CN115113670A (en) * | 2021-03-23 | 2022-09-27 | 圣邦微电子（北京）股份有限公司 | Low Dropout Linear Regulators |
| CN115469708A (en) * | 2022-11-15 | 2022-12-13 | 英彼森半导体(珠海)有限公司 | Band gap reference starting circuit |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104393760A (en) * | 2014-11-27 | 2015-03-04 | 中国兵器工业集团第二一四研究所苏州研发中心 | Positive-negative output low dropout adjusting circuit with short-circuit protection function |
| CN105099159A (en) * | 2015-08-21 | 2015-11-25 | 电子科技大学 | Quick starting circuit for DC-DC converter |
| CN105099159B (en) * | 2015-08-21 | 2017-08-29 | 电子科技大学 | A kind of fast start circuit for DC DC converters |
| CN105337499A (en) * | 2015-11-24 | 2016-02-17 | 中国电子科技集团公司第五十五研究所 | Underloading current compensation circuit of cuk type switching convertor |
| CN105337499B (en) * | 2015-11-24 | 2018-01-16 | 中国电子科技集团公司第五十五研究所 | A kind of underloading current compensation circuit of cuk types switch converters |
| CN107742981A (en) * | 2017-08-02 | 2018-02-27 | 宁德时代新能源科技股份有限公司 | Low-voltage power supply circuit, battery sampling unit and vehicle power supply battery |
| CN107294379A (en) * | 2017-08-12 | 2017-10-24 | 厦门奇力微电子有限公司 | The linear voltage-stabilizing circuit and method of High Pressure Difference exchange input |
| CN107294379B (en) * | 2017-08-12 | 2023-07-28 | 厦门奇力微电子有限公司 | Linear voltage stabilizing circuit and method for high-voltage difference alternating current input |
| CN109976432B (en) * | 2017-11-15 | 2022-05-03 | 英飞凌科技股份有限公司 | Feedback circuit for regulation loop |
| CN109976432A (en) * | 2017-11-15 | 2019-07-05 | 英飞凌科技股份有限公司 | Feed circuit for regulating loop |
| CN107994763A (en) * | 2018-01-09 | 2018-05-04 | 深圳市海鸿微电子科技有限公司 | A kind of Switching Power Supply and its control circuit, the activation system of controller |
| CN108874010A (en) * | 2018-09-06 | 2018-11-23 | 深圳市中微半导体有限公司 | A kind of strong anti-interference LDO module and anti-interference touch detection circuit |
| CN111698809A (en) * | 2019-03-13 | 2020-09-22 | 益力半导体股份有限公司 | Low-dimming fast driving system, method and controller |
| WO2021068103A1 (en) * | 2019-10-08 | 2021-04-15 | Alibaba Group Holding Limited | System and method for efficient power delivery |
| CN114503049A (en) * | 2019-10-08 | 2022-05-13 | 阿里巴巴集团控股有限公司 | System and method for efficient power supply |
| CN112684841A (en) * | 2019-10-18 | 2021-04-20 | 圣邦微电子（北京）股份有限公司 | Low dropout regulator with high power supply rejection ratio |
| CN111313674A (en) * | 2019-11-06 | 2020-06-19 | 北京比特大陆科技有限公司 | Power-on control circuit and electronic equipment with same |
| CN115113670A (en) * | 2021-03-23 | 2022-09-27 | 圣邦微电子（北京）股份有限公司 | Low Dropout Linear Regulators |
| CN115469708A (en) * | 2022-11-15 | 2022-12-13 | 英彼森半导体(珠海)有限公司 | Band gap reference starting circuit |
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Application publication date: 20100929 |