CN105843318A - Low dropout regulator circuit - Google Patents
Low dropout regulator circuit Download PDFInfo
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- CN105843318A CN105843318A CN201610168088.7A CN201610168088A CN105843318A CN 105843318 A CN105843318 A CN 105843318A CN 201610168088 A CN201610168088 A CN 201610168088A CN 105843318 A CN105843318 A CN 105843318A
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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
- G05F1/565—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 sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
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- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
The invention relates to a low dropout regulator circuit comprising a first circuit unit, a second circuit unit and a feedback circuit unit; the first circuit unit is used for controlling output voltage of a power supply management system when electronic equipment is under normal work mode; the second circuit unit is used for controlling output voltage of the power supply management system when the electronic equipment is in the standby mode; the feedback circuit unit is used for returning the voltage signals of the output voltage of the power supply management system to the first and second circuit unit; the first and second circuit units can stabilize the output voltage of the power supply management system of the electronic equipment according to the voltage signals returned by the feedback circuit unit. The low dropout regulator circuit can distinguish the normal work mode and standby mode of the electronic equipment, can use an open loop control method to regulate the output voltage when the electronic equipment is under standby mode, thus reducing LDO standby static work current, reducing power supply management system standby power consumption, and prolonging battery standby time.
Description
Technical field
The present invention relates to field of power management, be specifically related to a kind of low pressure difference linear voltage regulator (LDO) circuit.
Background technology
In electric power system, stand-by power consumption directly determines the stand-by time of power supply unit, and stand-by power consumption is excessive, easily equipment long-time standby after cannot open because of battery over-discharge.The principal element affecting power-supply management system stand-by power consumption is the LDO in different electrical power territory.Reduce the static working current of LDO, stand-by power consumption can be significantly reduced, extend the stand-by time of power supply unit.
Fig. 1 is tradition LDO circuit Figure 100, including operational amplifier OP1, power tube Mp1 resistance R11, resistance R12 and electric capacity CL1.Tradition LDO circuit utilizes feedback method to realize not with input voltage and the regulated output voltage of load change.Specific works is as follows, after output voltage is by resistance R11 and resistance R12 dividing potential drop, is input to the positive input of operational amplifier, this voltage compares with voltage reference source, and when output voltage declines, the gate voltage of power tube Mp1 declines, the conducting resistance of power tube Mp1 reduces, and output voltage rises again.So circulation, finally realizes stable output voltage.
In tradition LDO circuit, for ensureing the stability of loop, it is generally required to the limit being made up of output capacitance and equivalent load is as dominant pole, and LDO circuit design is pursued output capacitance and is reduced always, to reduce volume, this cause inside secondary limit will toward higher frequency shifts, this mean operational amplifier speed faster, thus need to consume bigger electric current.But under system stand-by mode, because the electric current of demand be reduced to the 1% of normal demand even below, so the dominant pole of output is substantially reduced, but traditional scheme time limit is the most corresponding to be reduced, and causes in stand-by mode, and amplifier is also with higher speed operation, the operating current causing amplifier is bigger, thus make amplifier operating current account for the static working current of main body relatively greatly, cause battery standby time short, the application problem of battery over-discharge even occurs.
Summary of the invention
The technical problem to be solved in the present invention is, drawbacks described above for prior art, it is provided that the LDO circuit of a kind of low standby power loss, overcomes tradition LDO circuit in stand-by mode, excessive due to static working current and that cause battery standby time is short, the even defect of battery over-discharge.
The technical solution adopted for the present invention to solve the technical problems is:
There is provided a kind of low differential voltage linear voltage stabilizer circuit, by the first circuit unit, second circuit unit and feedback circuit unit.First circuit unit, for when described electronic equipment is in normal mode of operation, controls described power-supply management system output voltage；Second circuit unit, for when described electronic equipment is in standby mode, controls described power-supply management system output voltage；Feedback circuit unit for feeding back to described first circuit unit and second circuit unit by the voltage signal of described output voltage；The voltage signal that described first circuit unit and described second circuit unit are fed back according to described feedback circuit unit carries out voltage stabilizing process to the output voltage of the power-supply management system of described electronic equipment.
Present invention further optimization scheme is, the first circuit unit includes operational amplifier and power tube.Described operational amplifier is for processing the voltage signal that feedback circuit unit is fed back；Described power tube is used for regulating output voltage；Two inputs of wherein said operational amplifier connect voltage reference source and the outfan of described feedback circuit unit respectively, the enable of described operational amplifier controls end and connects normal mode of operation enable signal, and the outfan of described operational amplifier is connected with power tube.
Further, the reverse input end of described operational amplifier connects voltage reference source, and the positive input of described operational amplifier connects the outfan of described feedback circuit unit.
Further, described power tube is P-channel enhancement type field effect transistor, the grid of described P-channel enhancement type field effect transistor is connected with the outfan of described operational amplifier, the source electrode of described P-channel enhancement type field effect transistor is connected with input power, and the drain electrode of described P-channel enhancement type field effect transistor is connected with described output voltage terminal.
Present invention further optimization scheme is, described second circuit unit includes hysteresis comparator, level translator and auxiliary power pipe.Described hysteresis comparator is for processing the voltage signal of feedback circuit unit feedback；Described level translator is for the output level of switching delays comparator；Described auxiliary power pipe is used for regulating output voltage；Two inputs of wherein said hysteresis comparator connect voltage reference source and the outfan of described bleeder circuit unit respectively, the enable of described hysteresis comparator controls end and connects standby mode enable signal, the outfan of described hysteresis comparator is connected with the input of level translator, and the outfan of described level translator is connected with described auxiliary power pipe.
Further, the reverse input end of described hysteresis comparator connects voltage reference source, and the positive input of described hysteresis comparator connects the outfan of described feedback circuit unit.
Further, described auxiliary power pipe is P-channel enhancement type field effect transistor, the grid of described P-channel enhancement type field effect transistor is connected with the outfan of described hysteresis comparator, the source electrode of described P-channel enhancement type field effect transistor is connected with input voltage, and the drain electrode of described P-channel enhancement type field effect transistor is connected with described output voltage terminal.
Present invention further optimization scheme is, described feedback circuit unit includes the first resistance and the second resistance.One end of described first resistance is connected with output voltage, and the other end of described first resistance is connected with one end of described second resistance, the other end ground connection of described second resistance.
The beneficial effects of the present invention is, by distinguishing normal mode of operation and the standby mode of electronic equipment, the standby mode LDO circuit that the normal mode LDO circuit being in by electronic equipment under normal mode of operation is under standby mode with electronic equipment combines, use the control method regulation output voltage of open loop, with reach reduce LDO standby time static working current, thus reduce power-supply management system stand-by power consumption, extend battery standby time effect.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is tradition LDO circuit figure；
Fig. 2 is the circuit block diagram of the LDO circuit of an embodiment of the present invention；
Fig. 3 is the physical circuit figure of the LDO circuit shown in Fig. 2 of the present invention；
Detailed description of the invention
In conjunction with accompanying drawing, presently preferred embodiments of the present invention is elaborated.
Fig. 2 is circuit block Figure 200 of the LDO circuit of an embodiment of the present invention, and in the present embodiment, LDO circuit includes the first circuit unit 202, second circuit unit 204 and feedback circuit unit 206.First circuit unit 202, for when electronic equipment is in normal mode of operation, controls the output voltage of the power-supply management system of electronic equipment；Second circuit unit 204, for when electronic equipment is in standby mode, controls the output voltage of the power-supply management system of electronic equipment；Feedback circuit unit 206 is for feeding back to the first circuit unit 202 and second circuit unit 204 by the voltage signal of the output voltage of the power-supply management system of electronic equipment.The output voltage of power-supply management system is connected to the input of feedback circuit unit 206, the outfan of feedback circuit unit 206 is respectively connecting to input and the input of second circuit unit 204 of the first circuit unit 202, the outfan of the first circuit unit 202 and the outfan of second circuit unit 204 and is connected to output voltage terminal.Wherein, output voltage is adjusted by the voltage signal that the first circuit unit 202 and second circuit unit 204 are fed back according to feedback circuit unit 206, carries out voltage stabilizing process with the output voltage of the power-supply management system to electronic equipment.
When electronic equipment is in normal mode of operation, the first circuit unit 202 is used to regulate output voltage, when electronic equipment is in standby mode, second circuit unit 204 works, use the control method regulation output voltage of open loop, and then reduce LDO standby time static working current, thus the power consumption under reducing standby mode, extend battery standby time.In the present embodiment, described electronic equipment refers to use in its power-supply management system the electronic equipment of LDO circuit, can be such as that mobile phone, flat board etc. make, in battery-powered electronic equipment, to use described LDO circuit, power-supply management system stand-by power consumption can be reduced, extend battery standby time；Can also be the electronic equipment using alternating current power supply to power, such as host computer, display etc., use described LDO circuit, power-supply management system stand-by power consumption can be reduced.
Fig. 3 is physical circuit Figure 30 0 of the LDO circuit shown in Fig. 2 of the present invention.
In the present embodiment, LDO circuit includes the first circuit unit 302, second circuit unit 304 and feedback circuit unit 306.
In one embodiment, the first circuit unit 302 can include operational amplifier and power tube.Two inputs of operational amplifier connect the outfan of voltage reference source and feedback circuit unit respectively, the enable of operational amplifier controls end and connects normal mode of operation enable signal, the outfan of operational amplifier is connected with power tube, operational amplifier is for processing the voltage signal that feedback circuit unit is fed back, and power tube is used for regulating output voltage.
In one embodiment, the reverse input end of operational amplifier connects voltage reference source, and the positive input of operational amplifier connects the outfan of feedback circuit unit.In other embodiments, the signal that can be connected according to the positive input of the type adjustment operational amplifier of LDO circuit principle and the power tube used and reverse input end.
In one embodiment, power tube can be P-channel enhancement type field effect transistor, the grid of P-channel enhancement type field effect transistor is connected with the outfan of operational amplifier, the source electrode of P-channel enhancement type field effect transistor is connected with input power, and the drain electrode of described P-channel enhancement type field effect transistor is connected with output voltage terminal.In other embodiments, power tube can be other kinds of field effect transistor or audion, according to different types of power tube, the connected mode of the signal of two inputs of operational amplifier is the most different, processes as long as the output voltage that can realize the power-supply management system to described electronic equipment carries out voltage stabilizing.
In one embodiment, second circuit unit 304 can include hysteresis comparator, level translator and auxiliary power pipe.Hysteresis comparator is for processing the voltage signal of feedback circuit unit feedback；Level translator is for the output level of switching delays comparator, to meet the voltage request of auxiliary power pipe；Auxiliary power pipe is used for regulating output voltage；Wherein two inputs of hysteresis comparator connect the outfan of voltage reference source and feedback circuit unit respectively, the enable of hysteresis comparator controls end and connects standby mode enable signal, the outfan of hysteresis comparator is connected with level translator, and the outfan of level translator is connected with auxiliary power pipe.
In other embodiments, hysteresis comparator can also use operational amplifier to replace, but the power consumption of the power dissipation ratio hysteresis comparator of operational amplifier is big, so using hysteresis comparator can preferably reduce stand-by power consumption.
In one embodiment, in the case of low input, can directly use input power is that hysteresis comparator is powered, and directly drives auxiliary power pipe, it is not necessary to use level translator.
In one embodiment, the reverse input end of hysteresis comparator connects voltage reference source, and the positive input of hysteresis comparator connects the outfan of feedback circuit unit.In other embodiments, the signal that can be connected according to the positive input of the type adjustment hysteresis comparator of LDO circuit principle and the auxiliary power used pipe and reverse input end.
In one embodiment, auxiliary power pipe is P-channel enhancement type field effect transistor, the grid of P-channel enhancement type field effect transistor is connected with the outfan of hysteresis comparator, and the source electrode of P-channel enhancement type field effect transistor is connected with input power, and the drain electrode of P-channel enhancement type field effect transistor is connected with output voltage terminal.In other embodiments, auxiliary power pipe can be other kinds of field effect transistor or audion, according to different types of auxiliary power pipe, the connected mode of the signal of two inputs of hysteresis comparator is the most different, processes as long as can realize that the input voltage of described electronic equipment is carried out voltage stabilizing.
In one embodiment, auxiliary power pipe can be incorporated to power tube in the normal mode of operation use, i.e. when normal mode of operation, first circuit unit can use power tube and auxiliary power pipe simultaneously, and when standby mode, only use auxiliary power pipe, so design can select the power tube of relatively small dimension, and then reduce production cost.Present embodiment is some difference on circuit connecting mode, but equally realizes the technique effect of the present invention.
In one embodiment, feedback circuit unit 306 can include the first resistance and the second resistance, one end of first resistance is connected with output voltage, the other end of the first resistance and one end of the second resistance are connected, the other end ground connection of the second resistance, its effect is that the voltage signal of output voltage feeds back to the first circuit unit and second circuit unit.In other embodiments, other can be selected to have the feedback circuit of phase same-action.
The operation principle of physical circuit Figure 30 0 of the LDO shown in Fig. 3 is as follows:
First circuit unit 302 includes operational amplifier OP3 and power tube Mp3 (P-channel enhancement type field effect transistor)；Second circuit unit 304 includes hysteresis comparator D3, level translator LS (level-shift) and auxiliary power pipe Maux3 (P-channel enhancement type field effect transistor)；Feedback circuit unit 306 includes the first resistance R31 and the second resistance R32.Input power Vin connects source electrode and the source electrode of auxiliary power pipe Maux3 of power tube Mp3 respectively；The reverse input end of voltage reference source concatenation operation amplifier OP3 respectively and the reverse input end of hysteresis comparator D3；The positive input of the outfan of feedback circuit unit concatenation operation amplifier OP3 respectively and the positive input of hysteresis comparator D3；The enable of normal mode of operation signal concatenation operation amplifier OP3 controls end, and standby mode signal connects the enable of hysteresis comparator D3 and controls end；The outfan of operational amplifier OP3 connects the grid of power tube Mp3, and the drain electrode of power tube Mp3 is connected to output end vo ut；The outfan of hysteresis comparator D3 connects the grid of auxiliary power pipe Maux3, and the drain electrode of auxiliary power pipe Maux3 connects output end vo ut.
When normal mode of operation signal is effective, first circuit unit 302 works, feedback method is utilized to realize not with input power Vin and the regulated output voltage of load change, when outfan Vout voltage declines, the gate voltage of power tube Mp3 declines, the conducting resistance of power tube Mp3 reduces, and the electric current of input Vin to output end vo ut increases, and outfan Vout voltage rises again.So circulation, finally realizes stable output voltage.Operation principle is similar to tradition LDO.
When standby mode signal is effective, second circuit unit 304 works, it is assumed that output target voltage is Vtrag, the amount of hysteresis of hysteresis comparator D3 is Vhys, when outfan Vout voltage drops to Vtrag-Vhys, hysteresis comparator D3 output low level, after level translator LS, the grid voltage of auxiliary power pipe Maux3 reduces rapidly, auxiliary power pipe Maux3 opens, and output end vo ut is charged by input voltage by auxiliary power pipe Maux3, when outfan Vout voltage rises to VtragHysteresis comparator D3 exports high level, after level translator LS, the grid voltage of auxiliary power pipe Maux3 raises rapidly, auxiliary power pipe Maux3 closes, outfan Vout voltage relies on the electric charge being stored in electric capacity CL3 to maintain, along with the connect load discharge of output end vo ut, when voltage drops to V againtrag-Vhys, repeat above-mentioned process.
By using above-mentioned LDO circuit, normal mode of operation and the standby mode of electronic equipment are distinguished, the standby mode LDO circuit that the normal mode LDO circuit being in by electronic equipment under normal mode of operation is under standby mode with electronic equipment combines, utilize the control method regulation output voltage of open loop, and then reduce LDO standby time static working current, thus reduce power-supply management system stand-by power consumption, extend battery standby time effect.
Should be understood that, above example only in order to technical scheme to be described, is not intended to limit, for a person skilled in the art, technical scheme described in above-described embodiment can be modified, or wherein portion of techniques feature is carried out equivalent；And all such modifications and replacement, all should belong to the protection domain of claims of the present invention.
Claims (8)
1. a low differential voltage linear voltage stabilizer circuit, the voltage stabilizing for the power-supply management system of electronic equipment processes,
It is characterized in that, including:
First circuit unit, for when described electronic equipment is in normal mode of operation, controls described power supply
The output voltage of management system；
Second circuit unit, for when described electronic equipment is in standby mode, controls described power management
The output voltage of system；
Feedback circuit unit, for feeding back to institute by the voltage signal of the output voltage of described power-supply management system
State the first circuit unit and second circuit unit；
Wherein, described first circuit unit and described second circuit unit are anti-according to described feedback circuit unit institute
The voltage signal of feedback carries out voltage stabilizing process to the output voltage of the power-supply management system of described electronic equipment.
2. low differential voltage linear voltage stabilizer circuit as claimed in claim 1, it is characterised in that described first circuit
Unit includes:
Operational amplifier, for processing the voltage signal that described feedback circuit unit is fed back；And
Power tube, is used for regulating described output voltage；
Wherein, two inputs of described operational amplifier connect voltage reference source and described feedback circuit respectively
The outfan of unit, the enable of described operational amplifier controls end and connects normal mode of operation enable signal,
The outfan of described operational amplifier is connected with described power tube.
3. low differential voltage linear voltage stabilizer circuit as claimed in claim 2, it is characterised in that described operation amplifier
The reverse input end of device connects voltage reference source, and the positive input of described operational amplifier connects described
The outfan of feedback circuit unit.
4. low differential voltage linear voltage stabilizer circuit as claimed in claim 3, it is characterised in that described power tube is
P-channel enhancement type field effect transistor, the grid of described P-channel enhancement type field effect transistor is put with described computing
The outfan of big device is connected, and the source electrode of described P-channel enhancement type field effect transistor is connected with input power,
The drain electrode of described P-channel enhancement type field effect transistor is connected with described output voltage terminal.
5. low differential voltage linear voltage stabilizer circuit as claimed in claim 1, it is characterised in that described second circuit
Unit includes:
Hysteresis comparator, for processing the voltage signal that described feedback circuit unit is fed back；
Level translator, for the output level of switching delays comparator；And
Auxiliary power pipe, is used for regulating output voltage；
Two inputs of wherein said hysteresis comparator connect voltage reference source and described feedback circuit list respectively
The outfan of unit, the enable of described hysteresis comparator controls end and connects standby mode enable signal, described
The outfan of hysteresis comparator is connected with level translator, and the outfan of described level translator is with described
Auxiliary power pipe is connected.
6. low differential voltage linear voltage stabilizer circuit as claimed in claim 5, it is characterised in that described sluggishness compares
The reverse input end of device connects voltage reference source, and the positive input of described hysteresis comparator connects described
The outfan of feedback circuit unit.
7. low differential voltage linear voltage stabilizer circuit as claimed in claim 6, it is characterised in that described auxiliary power
Pipe is P-channel enhancement type field effect transistor, the grid of described P-channel enhancement type field effect transistor with described late
The outfan of stagnant comparator is connected, the source electrode of described P-channel enhancement type field effect transistor and input power phase
Even, the drain electrode of described P-channel enhancement type field effect transistor is connected with described output voltage terminal.
8. low differential voltage linear voltage stabilizer circuit as claimed in claim 1, it is characterised in that described feedback circuit
Unit includes that the first resistance and the second resistance, one end of described first resistance are connected with described output voltage,
The other end of described first resistance is connected with one end of described second resistance, another of described second resistance
End ground connection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610168088.7A CN105843318B (en) | 2016-03-23 | 2016-03-23 | Low differential voltage linear voltage stabilizer circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610168088.7A CN105843318B (en) | 2016-03-23 | 2016-03-23 | Low differential voltage linear voltage stabilizer circuit |
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| CN105843318A true CN105843318A (en) | 2016-08-10 |
| CN105843318B CN105843318B (en) | 2018-01-26 |
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| CN201610168088.7A Active CN105843318B (en) | 2016-03-23 | 2016-03-23 | Low differential voltage linear voltage stabilizer circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106160419A (en) * | 2016-08-23 | 2016-11-23 | 黄继颇 | Low voltage difference voltage-stabilized power supply circuit structure |
| CN111781980A (en) * | 2020-06-15 | 2020-10-16 | 上海华虹宏力半导体制造有限公司 | Voltage control circuit and control method thereof |
| WO2021068103A1 (en) * | 2019-10-08 | 2021-04-15 | Alibaba Group Holding Limited | System and method for efficient power delivery |
| CN112947662A (en) * | 2021-03-25 | 2021-06-11 | 深圳前海维晟智能技术有限公司 | Low-power consumption LDO circuit based on comparator |
| CN113131918A (en) * | 2019-12-31 | 2021-07-16 | 格科微电子（上海）有限公司 | Low-dropout voltage converter circuit and standby circuit system thereof |
| CN114217660A (en) * | 2021-12-15 | 2022-03-22 | 芯河半导体科技(无锡)有限公司 | LDO (low dropout regulator) circuit system without external output capacitor |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106160419A (en) * | 2016-08-23 | 2016-11-23 | 黄继颇 | Low voltage difference voltage-stabilized power supply circuit structure |
| CN106160419B (en) * | 2016-08-23 | 2018-09-14 | 黄继颇 | Low voltage difference voltage-stabilized power supply circuit structure |
| WO2021068103A1 (en) * | 2019-10-08 | 2021-04-15 | Alibaba Group Holding Limited | System and method for efficient power delivery |
| CN113131918A (en) * | 2019-12-31 | 2021-07-16 | 格科微电子（上海）有限公司 | Low-dropout voltage converter circuit and standby circuit system thereof |
| CN111781980A (en) * | 2020-06-15 | 2020-10-16 | 上海华虹宏力半导体制造有限公司 | Voltage control circuit and control method thereof |
| CN112947662A (en) * | 2021-03-25 | 2021-06-11 | 深圳前海维晟智能技术有限公司 | Low-power consumption LDO circuit based on comparator |
| CN114217660A (en) * | 2021-12-15 | 2022-03-22 | 芯河半导体科技(无锡)有限公司 | LDO (low dropout regulator) circuit system without external output capacitor |
| CN114217660B (en) * | 2021-12-15 | 2023-11-10 | 芯河半导体科技(无锡)有限公司 | LDO circuit system without external output capacitor |
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