CN207475520U - A kind of switching circuit being connected between input source voltage and output loading - Google Patents
A kind of switching circuit being connected between input source voltage and output loading Download PDFInfo
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- CN207475520U CN207475520U CN201721158683.9U CN201721158683U CN207475520U CN 207475520 U CN207475520 U CN 207475520U CN 201721158683 U CN201721158683 U CN 201721158683U CN 207475520 U CN207475520 U CN 207475520U
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Abstract
The utility model discloses a kind of switching circuits being connected between input source voltage and output loading, including NMOS load switches, control circuit, the NMOS load switches include load switch grid, load switch source electrode and load switch drain electrode, the output terminal of the control circuit and are electrically connected with the load switch grid；The NMOS load switches are transmitted to the surge current of the load switch source electrode by the control voltage on the load switch grid to control to drain from the load switch；The control circuit is used to the load switch grid voltage being pumped to more than VIN voltage.
Description
Technical field
The utility model is related to the switching devices of input selection power path, and input is connected in particular to one kind
Switching circuit between source voltage and output loading.
Background technology
As contemporary portable system becomes increasingly complex and encapsulate more and more intensive, circuit and device are needed in low electricity
It works under the voltage of source.The operating voltage of existing many processors and memory is all in 1V or 1V hereinafter, in order to protect this
A little systems, usually quote the on/off characteristics of load switch control load device, and the introducing of load switch causes user soft can to open
Dynamic system, and can be switched off so that it does not consume power when not in use.For earlier generations system, supply voltage is all super
2V is crossed, prevailing load switch technology is to use PMOS power transistors.When PMOS device is as load switch,
Grid is introduced in ground potential, to connect switch.In order to which PMOS device is made to provide the Low ESR road between source electrode and load
Diameter, source voltage must be at 2 times of threshold voltage of the grid；That is, for typical CMOS technology, PMOS device
Threshold voltage of the grid is about 0.8V, therefore for the abundant enhancing of PMOS device, and source voltage necessarily is greater than 1.6V.PMOS load
An advantage is hardly to consume power in the on-state possessed by switch, because grid voltage can be simple by one
Phase inverter be maintained at low potential.However, when system voltage is needed less than 2V, the conducting resistance of PMOS device is with grid electricity
The reduction of pressure and increase, for system of the supply voltage in the range of 1V, PMOS load switch be disabled.
Utility model content
The purpose of this utility model is to provide a kind of switch electricity being connected between input source voltage and output loading
Road is pressed in solving PMOS load switch power supply in the range of 1V, and PMOS load switchs not available problem.
In order to reach above-mentioned technical purpose, the technical scheme adopted by the utility model is that：One kind is connected in input source electrode
Switching circuit between voltage and output loading, including NMOS load switches, control circuit, the NMOS load switches include negative
Load switch grid, load switch source electrode and load switch drain electrode, the output terminal of the control circuit and the load switch grid
Electrical connection；
The switching circuit is drained by the control voltage on the load switch grid to control from the load switch
It is transmitted to the surge current of the load switch source electrode；
The control circuit is used to the load switch grid voltage being pumped to more than VIN voltage.
Further, the control circuit include charge pump circuit CP, the output terminal of the charge pump circuit CP with it is described
Load switch grid is electrically connected, for pumping up the load switch grid voltage.
Further, the control circuit further includes ring oscillator ROSC, backfeed loop, and the backfeed loop includes electricity
Hold divider, comparator COMP, the input terminal of the capacitive divider is electrically connected with the switching load grid, the capacitance point
The output terminal of depressor is electrically connected with the input terminal of the comparator COMP, the output terminal and ring oscillator of the comparator COMP
The input terminal electrical connection of ROSC, the output terminal of the ring oscillator ROSC are electrically connected with the input terminal of charge pump circuit CP；Institute
It states ring oscillator ROSC and provides clock input, the backfeed loop control for the charge pump into the charge pump circuit CP
The on off state of the ring oscillator ROSC, the capacitive divider control the voltage gain of the backfeed loop.
Further, the capacitive divider includes capacitance C4 and capacitance C5, one end and the load switch grid of capacitance C4
Pole is electrically connected, one end of other end connection capacitance C5 and the input terminal of comparator COMP, the other end ground connection of capacitance C5.
Further, the comparator COMP is Schmidt trigger or analog comparator COMP.
Further, the control circuit further includes opens described in the output terminal electrical connection of wave filter FL, the wave filter FL
Close load grid, the output terminal of input terminal connection charge pump circuit CP.
Compared with prior art, the beneficial effects of the utility model are：
(1) NMOS transistor is introduced as load switch, as long as grid voltage is more than source voltage, NMOS transistor in this way
Just it connects, the grid voltage of NMOS load switches is adjusted by control circuit, charge pump circuit and ring oscillator can will be born
Load switch grid voltage is pumped up the threshold voltage (i.e. source voltage) set by backfeed loop, once reach threshold value electricity
Pressure turns off charge pump circuit and ring oscillator, so as to reduce consumption power by backfeed loop.
(2) since the grid of the first power NMOS switch is pure capacitance, thus the voltage on load switch grid can be with
It keeps stablizing a very long time, thus backfeed loop is turned off charge pump circuit and ring oscillator in a very long time,
When load switch electric leakage of the grid causes voltage level to decay to scheduled threshold value, backfeed loop just re-closes charge pump charge
And ring oscillator, to charge to load switch grid voltage, so as to reduce power consumption.
(3) it can reduce when load switch is connected, the surge current in output loading, reduce the damage of output loading in this way
Bad probability.
Description of the drawings
The attached drawing of the utility model is used for providing further understanding of the present application, the part of the application is formed, at this
The same or similar part is represented using identical reference label in a little attached drawings, in the accompanying drawings：
Fig. 1 is the general frame of switching circuit described in embodiment 1；
Fig. 2 is to scheme in the time sequential routine of control circuit described in embodiment 1；
Fig. 3 is the charge pump circuit figure described in embodiment 1 and embodiment 2；
Fig. 4 is the ring oscillator circuit figure described in embodiment 1 and embodiment 2；
Fig. 5 is the on and off row that can be used for controlling ring oscillator described in embodiment 1 and embodiment 2
For Schmidt trigger circuit diagram；
Fig. 6 is the general frame of the switching circuit described in embodiment 2.
Specific embodiment
Purpose, technical scheme and advantage to make the application are clearer, below in conjunction with drawings and the specific embodiments, to this
Application is described in further detail, and the illustrative embodiments and their description of the application are used to explain the application, composition pair
The improper restriction of the application.
Embodiment 1
Referring to Fig. 1 to Fig. 6, a kind of switching circuit being connected between input source voltage VIN and output loading, the switch
Circuit includes being connected to the NMOS load switches between VIN pins and VOUT pins and being electrically connected with the grid of NMOS load switches
Control circuit.Control circuit includes charge pump circuit CP, ring oscillator ROSC and backfeed loop, and backfeed loop includes capacitance
Divider, comparator COMP；
Specifically circuit connecting mode is：The source electrode of NMOS load switches is electrically connected with VIN pins, drain electrode and VOUT pins
Electrical connection, the output terminal of charge pump circuit CP is electrically connected with the grid of NMOS load switches, the input terminal of charge pump circuit CP and
The grid of the output terminal electrical connection of ring oscillator ROSC, the input terminal of capacitive divider and the first power NMOS power terminations switch
Pole is electrically connected, and the output terminal of capacitive divider is electrically connected with the input terminal of comparator COMP, the output terminal and ring of comparator COMP
The input terminal electrical connection of shape oscillator ROSC, the on off state of ring oscillator ROSC pass through EN input pins and backfeed loop control
System.
Wherein, charge pump circuit CP is CTS charge pumps, as shown in figure 3, the working method of charge pump circuit CP is as follows：When
When CLK is height and CLKB is low, the voltage on C1 becomes V2, V1+ Δs V=V2 from V1；In the next clock cycle, on C2
Voltage become V3, V2+ Δs V=V3 etc., until CL points on voltage reach VOUT level.To work normally switching circuit,
It needs to forward charge in each clock cycle, this requires that switch MS2 must be switched on by the voltage on C3.
The gate source voltage of MS2 is 2 Δ V, this has to be larger than the V of MS2T, i.e.,：V>VT；
The voltage gain of CTS charge pumps can be given by：
GV=GV2=V2-V1=V.
The present embodiment can also select other charge pump circuits CP outside CTS charge pumps, reaching the result is that identical
's.The uniqueness of this switching circuit is not dependent on certain types of charge pump circuit CP to realize final result.
Wherein, ring oscillator ROSC circuits as shown in figure 4, the operating voltage of the ring oscillator ROSC of the type in 1V
Or so, the ring oscillator ROSC in the present embodiment belongs to well known ring oscillator ROSC in industry, and in many about number
It is all had a detailed description in the teaching material of word circuit design.
Wherein, capacitive divider includes capacitance C4 and capacitance C5, and one end of capacitance C4 is electrically connected with load switch grid, separately
One end of one end connection capacitance C5 and the input terminal of comparator COMP, the other end ground connection of capacitance C5；Capacitor C4 and capacitance C5
Ratio determine the entire gain of backfeed loop, feedback voltage is made by ratio to be input to comparator COMP.
Wherein, comparator COMP is Schmidt trigger, can be with as shown in figure 5, Schmidt trigger is pseudo- digital circuit
It is worked with low-down supply voltage, the load switch grid voltage to be come by measuring capacitive divider conveying divides
Carry out on or off loop oscillator, the opening time of ring oscillator ROSC and charge pump is adjusted, so as to fulfill lower work(
Rate is lost.And Schmitt trigger circuit has built-in lag, and its level can simply be designed.Crystal can be passed through
The W/L ratios of pipe M1 and M3 set the ascending threshold of the incoming level of Schmidt trigger, while can be by adjusting crystal
The W/L ratios of pipe M5 and M6 adjust the falling-threshold value of incoming level.
In the present embodiment, analog comparator COMP also may be selected in comparator COMP, as shown in fig. 6, analog comparator
When COMP is directed to higher input voltage, comparing in precision and control to load switch grid voltage in voltage has higher spirit
Activity.
In the present embodiment, switching circuit further includes enabled buffer ENAB, pull-down load switch NMOS, enables enabled slow
The input terminal for rushing device ENAB is electrically connected with enabled pin EN, and output terminal is electrically connected with the input terminal of ring oscillator ROSC, drop-down
The grid of load switch NMOS is electrically connected with the output terminal of enabled buffer ENAB, and pull-down load switchs the grounded drain of NMOS,
The source electrode of pull-down load switch NMOS is electrically connected with the source electrode of NMOS load switches；The effect of enabled buffer ENAB is to make EN
Enable signal unlatching ring oscillator ROSC after enabled buffer ENAB bufferings, low electricity is inputted when giving enabled buffer ENAB
Usually, high level is exported to the grid for the NMOS that pulls down switch through enabling the phase inverter inside buffer ENAB, opens pull-down load
NMOS conductings are closed, in this way, VOUT discharges into ground through pull down resistor.
Fig. 2 gives the time sequential routine figure of the control circuit of this switching circuit：When EN input pins reach high level, i.e. T0
When, ring oscillator ROSC and charge pump circuit CP is connected, and charge pump circuit CP pumps up load switch grid voltage
VGATE, ring oscillator ROSC provide clock input to charge pump；When load switch grid voltage reaches threshold voltage,
That is T1 moment, comparator COMP turn off ring oscillator ROSC and charge pump circuit CP, and load switch grid voltage VGATE starts
Decline；When load switch grid voltage VGATE drops to scheduled threshold value, i.e., T2 moment, comparator COMP are again switched on ring
Shape oscillator ROSC and charge pump circuit CP, charge pump circuit CP pump load switch grid voltage VGATE again up；Until
Load switch grid voltage VGATE is pumped back threshold voltage, i.e. T3 moment, and comparator COMP turns off ring oscillator again
ROSC and charge pump circuit CP, load switch grid voltage VGATE begin to decline, so move in circles again, until VOUT voltages
Equal to the voltage on VIN pins.Using this technology, switching circuit is only in ring oscillator ROSC operations and charge pump circuit CP
Power is just consumed when pumping up grid voltage VGATE, in other times, power consumption is close to zero.
Embodiment 2
Referring to Fig. 2 to Fig. 6, Fig. 6 shows the general frame of the switching circuit of the present embodiment, except control circuit further includes filter
Outside wave device FL, remaining is same as Example 1, the output terminal electrical connection switching load grid of wave filter FL, the input of wave filter FL
The output terminal of end electrical connection charge pump circuit CP, wave filter FL are used for when switching circuit starts, and NMOS load switches are being led
The conversion rate of load switch grid voltage is controlled during the logical time, in order to limit the wave of the upper load capacitance from VIN to VOUT
Electric current is gushed, so as to which output loading be avoided to be damaged caused by surge current.
In the present embodiment, the grid of pull-down load switch NMOS is electrically connected with the output terminal of ring oscillator ROSC, is pulled down
The grounded drain of load switch NMOS, the source electrode of pull-down load switch NMOS are electrically connected with the source electrode of NMOS load switches, in this way,
Pull-down load switch NMOS effect be；During enabled buffer ENAB input low levels, by the height of internal inverters output
Level is input to the grid of pull-down load switch NMOS through ring oscillator circuit ROSC, makes pull-down load switch NMOS conductings,
VOUT discharges into ground through pull down resistor in this way.
Above example describes more specific and detailed, also gives some advantageous measures of embodiment, still, the reality
It applies example and advantageous measure when those skilled in the art sees the program, can not be made as the limitation to the utility model
Other deformation and equivalent arrangements replacement, should be covered by the scope of the present utility model within.
Claims (9)
1. a kind of switching circuit being connected between input source voltage and output loading, it is characterised in that：It is loaded including NMOS
Switch, control circuit, the NMOS load switches include load switch grid, load switch source electrode and load switch drain electrode, institute
The output terminal for stating control circuit is electrically connected with the load switch grid；
The NMOS load switches are drained by the control voltage on the load switch grid to control from the load switch
It is transmitted to the surge current of the load switch source electrode；
The control circuit is used to the load switch grid voltage being pumped to more than VIN voltage.
2. a kind of switching circuit being connected between input source voltage and output loading according to claim 1, special
Sign is：The control circuit includes charge pump circuit CP, the output terminal of the charge pump circuit CP and the load switch grid
Pole is electrically connected, for pumping up the load switch grid voltage.
3. a kind of switching circuit being connected between input source voltage and output loading according to claim 2, special
Sign is：The control circuit further includes ring oscillator ROSC, backfeed loop, the backfeed loop include capacitive divider,
Comparator COMP, the input terminal of the capacitive divider are electrically connected with the switching load grid, the capacitive divider it is defeated
Outlet is electrically connected with the input terminal of the comparator COMP, and the output terminal of the comparator COMP is defeated with ring oscillator ROSC's
Enter end electrical connection, the output terminal of the ring oscillator ROSC is electrically connected with the input terminal of charge pump circuit CP；The annular is shaken
It swings device ROSC and provides clock input for the charge pump into the charge pump circuit CP, the backfeed loop controls the annular
The on off state of oscillator ROSC, the capacitive divider control the voltage gain of the backfeed loop.
4. a kind of switching circuit being connected between input source voltage and output loading according to claim 3, special
Sign is：The capacitive divider includes capacitance C4 and capacitance C5, and one end of capacitance C4 is electrically connected with load switch grid, another
One end of end connection capacitance C5 and the input terminal of comparator COMP, the other end ground connection of capacitance C5.
5. a kind of switching circuit being connected between input source voltage and output loading according to claim 3, special
Sign is：The comparator COMP is Schmidt trigger or analog comparator.
6. a kind of switching circuit being connected between input source voltage and output loading according to claim 3, special
Sign is：The switching circuit further includes enabled buffer ENAB, and the input terminal of the enabled buffer ENAB is with enabling
Pin EN is electrically connected, and output terminal is electrically connected with the input terminal of the ring oscillator ROSC.
7. a kind of switching circuit being connected between input source voltage and output loading according to claim 6, special
Sign is：The output terminal that the control circuit further includes wave filter FL, the wave filter FL is electrically connected the switching load grid,
The output terminal of the input terminal connection charge pump circuit CP of wave filter FL.
8. a kind of switching circuit being connected between input source voltage and output loading according to claim 6, special
Sign is：The switching circuit further includes pull-down load switch NMOS, and the grid of the pull-down load switch NMOS makes with described
The output terminal electrical connection of energy buffer ENAB, the grounded drain of the pull-down load switch NMOS, the pull-down load switch
The source electrode of NMOS is electrically connected with the source electrode of the NMOS load switches.
9. a kind of switching circuit being connected between input source voltage and output loading according to claim 7, special
Sign is：The switching circuit further includes the grid and the ring of pull-down load switch NMOS, the pull-down load switch NMOS
The output terminal electrical connection of shape oscillator ROSC, the grounded drain of the pull-down load switch NMOS, the pull-down load switch
The source electrode of NMOS is electrically connected with the source electrode of the NMOS load switches.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721158683.9U CN207475520U (en) | 2017-09-11 | 2017-09-11 | A kind of switching circuit being connected between input source voltage and output loading |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721158683.9U CN207475520U (en) | 2017-09-11 | 2017-09-11 | A kind of switching circuit being connected between input source voltage and output loading |
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| CN207475520U true CN207475520U (en) | 2018-06-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109495094A (en) * | 2017-09-11 | 2019-03-19 | 杰夫微电子（四川）有限公司 | A kind of switching circuit being connected between input source voltage and output loading |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109495094A (en) * | 2017-09-11 | 2019-03-19 | 杰夫微电子（四川）有限公司 | A kind of switching circuit being connected between input source voltage and output loading |
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Denomination of utility model: A switching circuit connected between input source voltage and output load Effective date of registration: 20221108 Granted publication date: 20180608 Pledgee: Industrial Bank Limited by Share Ltd. Chengdu branch Pledgor: GLF MICROELECTRONICS (SICHUAN) CO.,LTD. Registration number: Y2022510000303 |