CN101299157B - Switch off control circuit of low-voltage difference linear voltage stabilizer - Google Patents
Switch off control circuit of low-voltage difference linear voltage stabilizer Download PDFInfo
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- CN101299157B CN101299157B CN2008100390558A CN200810039055A CN101299157B CN 101299157 B CN101299157 B CN 101299157B CN 2008100390558 A CN2008100390558 A CN 2008100390558A CN 200810039055 A CN200810039055 A CN 200810039055A CN 101299157 B CN101299157 B CN 101299157B
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Abstract
The present invention discloses a switching control circuit of the low dropout regulator LDO which is integrated in a circuit module that a main circuit is provided. The switching circuit comprises the following components: a trigger which outputs a low level triggering signal to the LDO when a reset low-level signal transmitted by a reset module is received, and outputs a high level triggering signal to the LDO when a jump edge of the signal outputted by the control module is received; the LDO which is actuated when the low-level triggering signal outputted by the trigger is received and provides a stabilizing voltage obtained by converting the power voltage to the control module, and is switched off when the high-level triggering signal outputted by the trigger is received; and a control module which outputs the signal when the stabilizing signal provided by the LDO is received, and jumps the output signal when the LDO needs to be switched off. When the invention is applied, the LDO can be simply switched off without adding a pin specialized for switching off the LDO to the processing chip when the LDO is provided at the inner part of the processing chip.
Description
Technical field
The present invention relates to turn-off control technology, particularly low pressure difference linear voltage regulator (LDO's) switches off control circuit.
Background technology
The circuit of finishing signal processing function in the portable electric appts is called the trunk circuit, the audio signal processing circuit of mobile call terminal for example, perhaps video processing circuit of video player or the like, this trunk circuit usually and control module be integrated in the circuit module, this circuit module is integrated in again in the process chip of portable electric appts usually.
Described control module has the control function that starts or turn-off the trunk circuit.Control starts trunk circuit execution signal Processing when carrying out signal Processing as needs, and at this moment power supply is a trunk circuit normal handling operation power; When need not to carry out signal Processing, the trunk circuit is turn-offed in control.This control module can realize by the control interface of portable electric appts usually, and the output terminal that above-mentioned control function can be possessed by self by control interface is to the realization that transmits control signal of trunk circuit.For example in mobile call terminal, above-mentioned control interface can be realized by Serial Peripheral Interface (SPI, Serial Peripheral Interface).
In the circuit module at above-mentioned trunk circuit place, also have reseting module usually, be used to provide the low level signal that resets.Can comprise power reset unit (connection power supply) and external reset signal unit (the external reset signal input pin on the process chip of connecting circuit module place) in this reseting module, wherein the power reset unit is the exportable low level signal that resets after the supply voltage input, and the external reset signal input block can receive the low level signal that resets by the input of the external reset signal input pin on the process chip at any time.
The power supply of the above-mentioned portable electric appts of mentioning, can be electric main or internal battery, but no matter be electric main behind overcommutation (or AC adapter) to the trunk circuit supply, still be to the trunk circuit supply by internal battery, in the process of work, supply voltage all will in very large range change.4.2 volts voltage for example can be provided during monomer lithium ion battery full charge, 2.3 volts of voltages only can be provided after having discharged, variation range is very big.And portable electric appts often requires to provide stable power voltage to the trunk circuit, and some miniature precision electronic equipments also require power supply very clean (ripple-free, noiseless).Therefore the way that adopts usually at present is the input end adding linear voltage regulator at power supply, because linear voltage regulator has the voltage of voltage regulation of setting, it at first becomes the practical power voltage transitions this setting voltage of voltage regulation, voltage of voltage regulation after will changing again offers the trunk circuit, so just guaranteed no matter how the supply voltage of portable electric appts changes, and the voltage that offers the trunk circuit by linear voltage regulator stablizes constant all the time.
At present the linear voltage regulator that often uses in portable electric appts is LDO, the annexation synoptic diagram when Fig. 1 shows LDO and trunk circuit and control module and is integrated in the circuit module, and frame of broken lines is wherein represented the circuit module at their places.As shown in Figure 1, LDO has a supply voltage input end 101, a voltage output end 103 and an earth terminal.
LDO receives the input of supply voltages by supply voltage input end 101, this supply voltage is converted to voltage of voltage regulation after, offer trunk circuit and control module by voltage output end 103.Because the portable electric appts electric energy that can provide is very limited, even and under trunk circuit and the situation about being turned off being connected of power supply, LDO self still can consume a part of electric energy, so in time turn-off LDO to avoid its power consumption also extremely important.Based on circuit structure shown in Figure 1, the method of turn-offing the LDO use at present is, an input end 102 that uses LDO is as the cut-off signals receiving end, accordingly, on the process chip at circuit module place, increase a pin that turn-offs the LDO special use, pin by this increase sends outside cut-off signals to described cut-off signals receiving end 102, makes LDO turn-off.
For avoiding on the process chip of portable electric appts, increasing a pin that turn-offs the LDO special use, also have at present LDO is arranged on technical scheme outside the process chip of trunk circuit place circuit module, but this way has increased chip application merchant's cost, so application prospect and pessimistic.
As seen, when also not occurring at present being integrated in LDO and trunk circuit in the circuit module, both having need not increases the pin that turn-offs the LDO special use, the technical scheme of shutoff LDO that again can be easy into the process chip at this circuit module place.
Summary of the invention
In view of this, fundamental purpose of the present invention is to provide switching off control circuit of a kind of LDO, this switches off control circuit can be when LDO and trunk circuit be integrated in the circuit module, need not increases the pin that turn-offs the LDO special use for the process chip at this circuit module place, just shutoff LDO that can be easy.
Technical scheme of the present invention is achieved in that
Switching off control circuit of a kind of low pressure difference linear voltage regulator, this switches off control circuit and is integrated in the circuit module at trunk circuit place, comprising: trigger, low pressure difference linear voltage regulator LDO, control module and reseting module;
Described trigger, what receive that described reseting module sends resets during low level signal, to LDO output low level trigger pip; When receiving the hopping edge of described control module output signal, to LDO output high trigger signal;
Described LDO starts after receiving the low level trigger pip of trigger output, and the voltage of voltage regulation that will be converted to by supply voltage offers described control module; Turn-off after receiving the high trigger signal of trigger output;
Described control module, output signal when receiving the voltage of voltage regulation that LDO provides; When needs turn-off LDO, the described output signal of saltus step.
As seen, in the switching off control circuit of LDO of the present invention, LDO and control module, reseting module are integrated in the circuit module at trunk circuit place, and in this circuit module, have increased trigger.Wherein, when control module was turn-offed LDO at needs, saltus step outputed to the output signal of trigger, and trigger to LDO output high level signal, turn-offs LDO when receiving the hopping edge of control module output signal.Thereby avoided LDO to control and turn-offed operation, promptly avoided increasing the dedicated pin of turn-offing LDO for the process chip at foregoing circuit module place by the cut-off signals of outside input, easy again realization turn-off the purpose of LDO.
Description of drawings
The structural representation that Fig. 1 switches off control circuit for LDO in the prior art;
The structural representation that Fig. 2 switches off control circuit for LDO among the present invention;
Fig. 3 is the structural representation of a kind of embodiment that LDO switches off control circuit among the present invention;
Fig. 4 is based on structural priming shown in Figure 3 and turn-offs in the process of LDO the synoptic diagram that the LDO output current changes;
Fig. 5 is the structural representation of a kind of application example that LDO switches off control circuit among the present invention;
Fig. 6 is the structural representation of the another kind of application example that LDO switches off control circuit among the present invention.
Embodiment
For making objects and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with drawings and Examples, and these explanations are nonrestrictive.
Fig. 2 is the structural representation that switches off control circuit of LDO provided by the invention, and this switches off control circuit and is integrated in the circuit module at trunk circuit place, comprising: LDO, trigger, reseting module and control module.The foregoing circuit module is integrated in again in the process chip of portable electric appts.
Described trigger, what receive that reseting module sends resets during low level signal, to LDO output low level trigger pip; When receiving the hopping edge of control module output signal, to LDO output high trigger signal.
Described LDO starts after receiving the low level trigger pip of trigger output, and supply voltage is converted to the voltage of voltage regulation of setting, offers described control module; Turn-off after receiving the high trigger signal of trigger output.
Described control module, output signal when receiving the voltage of voltage regulation of LDO; When needs turn-off LDO, the described output signal of saltus step.
As seen, in the switching off control circuit of LDO of the present invention, LDO and control module, reseting module are integrated in the circuit module at trunk circuit place, and in this circuit module, have increased trigger.Wherein, when control module is turn-offed LDO at needs, the saltus step output signal, trigger to LDO output high level signal, turn-offs LDO when receiving the hopping edge of control module output signal.Thereby avoided LDO to control and turn-offed operation, promptly avoided increasing the dedicated pin of turn-offing LDO for the process chip at foregoing circuit module place by the cut-off signals of outside input, easy again realization turn-off the purpose of LDO.
Saltus step output signal when control module of the present invention is turn-offed LDO at needs, can be to the high level signal saltus step by low level signal, also can be by high level signal to the low level signal saltus step, be that example provides the embodiment that LDO of the present invention switches off control circuit with the former below.
The structure of Fig. 3 for switching off control circuit in the embodiment of the invention.Be control module in the frame of broken lines wherein, comprise: control interface 301 and electric pressure converter 302; Be reseting module in the dot-dash wire frame, comprise: power reset unit 305, external reset signal input block 306, Sheffer stroke gate 303 and reverser 304; Trigger is a d type flip flop.
In the present embodiment, LDO removes and comprises that a supply voltage input end, a voltage output end (use A
OUTExpression) and outside earth terminal, also comprises a trigger pip receiving end 601, be used to receive the trigger pip that d type flip flop is exported.When LDO receives the low level trigger pip of d type flip flop output by above-mentioned trigger pip receiving end 601, start and the voltage of voltage regulation that supply voltage is converted to setting is offered control interface; The above-mentioned low level trigger pip saltus step that receives d type flip flops output by above-mentioned trigger pip receiving end 601 as LDO is turn-offed during for high trigger signal.Identical with common situation, the voltage output end (A of above-mentioned LDO
OUT) return the voltage of voltage regulation after the trunk circuit provides conversion, so that the trunk circuit can be finished normal handling operation, among Fig. 3 and not shown this part.
In the present embodiment, control interface 301 is by the voltage output end (A of LDO
OUT) reception power supply voltage of voltage regulation, LDO connects electric pressure converter 302 by the control output end (PWR_down) of self, the output terminal that this control output end (PWR_down) all can have under normal conditions for the control interface of portable electric appts, the present invention has utilized the signal of this existing output terminal to electric pressure converter 302 outputs.Receive the voltage output end (A of LDO when control interface 301
OUT) during the power supply of the voltage of voltage regulation of output, the logic of control output end (PWR_down) is output as 0, promptly is output as low level signal.The control serial ports that all can have usually on the alignment processing chip of above-mentioned control output end (PWR_down), can import the outer number signal (putting several signals in this case) of deploying by this control serial ports for putting 1 signal, the logic output of control output end (PWR_down) can be put 1, be about to low level signal and be changed to high level signal.
The effect of electric pressure converter 302 is that the parameter in control interface 301 output signals is converted to the parameter that d type flip flop uses, and d type flip flop can correctly be received.For example the logic of control output end (PWR_down) actual output voltage that is output as 1 o'clock correspondence is about 1.2 volts, because for d type flip flop, when the virtual voltage that receives is 3 volts, high level signal is just thought in its corresponding logic input, therefore electric pressure converter 302 effect at this moment is exactly that the virtual voltage that control output end (PWR_down) exports is converted to 3 volts that d type flip flop is suitable for for 1.2 volts, make d type flip flop can correctly receive the hopping edge of control interface 301 output signals, its transfer principle identical with generally repeats no more here.
As can be seen, in the present embodiment, control interface 301 is not directly carried out the operation of turn-offing the trunk circuit, but by turn-offing LDO, cuts off the power supply of trunk circuit, is equivalent to realize shutoff to the trunk circuit simultaneously by shutoff LDO.
In the present embodiment, power reset unit 305 is powered by power supply, when powering on, just send the low level signal that resets, this part of functions with generally be identical, difference is that the low level signal that resets of power reset unit 305 transmissions exports to the reset terminal 307 of d type flip flop.The low level signal that resets of the reset signal pin input that external reset signal input block 306 reception place process chip generally all can have, this low level signal that resets is an external signal.The low level signal as long as one of them output of power reset unit 305 and reset signal input block 306 resets, Sheffer stroke gate 303 is all exported high level signal, is converted to low level signal through reverser 304 again, outputs to the reset terminal 307 of d type flip flop.
In the present embodiment, d type flip flop comprises forward output terminal Q end, inverse output terminal QN end, reset terminal 307, D end and CP end.Wherein the D termination is received the supply voltage input, and d type flip flop is in running order when the supply voltage input is arranged; Reset terminal 307 is connected with the output terminal of reverser 304, forward output terminal Q end is connected with the trigger pip receiving end 601 of LDO, and when reverser 304 output low level signals, above-mentioned forward output terminal Q end is output as 0, be the output low level trigger pip, make LDO start; The CP end is connected with the output terminal of electric pressure converter 302, when electric pressure converter 302 output low level signals, the output of forward output terminal Q end does not change, when the signal of electric pressure converter 302 outputs is high level signal by the low level signal saltus step, the forward output terminal Q end output high level signal of d type flip flop makes LDO turn-off.
Based on the structure that switches off control circuit shown in Figure 3, following process is followed in the startup of LDO and shutoff:
1) power on after, power reset unit 305 sends the low level signal that resets, this low level signal that resets is by after Sheffer stroke gate 303 and the reverser 304, output to the reset terminal 307 of d type flip flop with the form of low level signal, then the forward output terminal Q of d type flip flop end is output as low level signal, makes LDO start;
2) after LDO starts, by voltage output end (A
OUT) providing voltage of voltage regulation to control interface 301, the control output end of control interface 301 (PWR_down) is output as low level signal, so the output signal of control output end (PWR_down) is inoperative to d type flip flop this moment;
When 3) needing to turn-off LDO, send the outer number signal of deploying by existing control serial ports on the process chip of circuit module place, the output signal of the control output end (PWR_down) of control interface 301 is changed to high level signal, this moment, the signal that received of CP end of d type flip flop will be by low level signal to the high level signal saltus step, therefore the forward output terminal Q of d type flip flop end is exported high trigger signal, and LDO turn-offs;
4) if the above-mentioned the 3rd) think to start once more LDO afterwards, then can realize by the external reset low level signal of external reset signal input block 306 inputs, this low level signal that resets is by after Sheffer stroke gate 303 and the reverser 304, output to the reset terminal 307 of d type flip flop with the form of low level signal, then the forward output terminal Q of d type flip flop end is output as the low level trigger pip, and LDO restarts.
More than 1)-4) and described in process, along with startup and the shutoff of LDO, the output of the pairing electric current of the voltage of voltage regulation that LDO provides will change, as shown in Figure 4.Shown in Figure 4 401 sections is to start the current diagram of exporting behind the LDO first, 402 sections current diagram for exporting behind the shutoff LDO, and 403 sections for restarting the current diagram of exporting behind the LDO.As can be seen, after each LDO starts, with the amphibolia of one section electric current output of experience, it is the broken line part among Fig. 4, when LDO finishes when supply voltage is converted to the voltage of voltage regulation of setting, enter the stationary phase of electric current output immediately, i.e. straight line portion in 401 sections and 403 sections among Fig. 4, after turn-offing LDO, the output current of LDO is 0.
Above-mentioned d type flip flop is a kind of embodiment that the embodiment of the invention provides, in actual applications, can also use JK flip-flop to realize identical functions, this JK flip-flop has forward output terminal Q end, inverse output terminal QN end, reset terminal and CP end, is equivalent to forward output terminal Q end, inverse output terminal QN end, reset terminal 307 and the CP end of d type flip flop in the foregoing description successively.This JK flip-flop also has a J input end and a K input end, and these two input ends are coupled together, and receives the supply voltage input so that JK flip-flop is in running order, is equivalent to the D end in the d type flip flop.This JK flip-flop repeats no more here in identical with above-mentioned d type flip flop on the function and on the implementation.
Though during the saltus step output signal,, in fact, can also be when control module that described above is is turn-offed LDO at needs to the low level signal saltus step by high level signal by the situation of low level signal to the high level signal saltus step.D type flip flop and JK flip-flop with foregoing description are example, need in this case to adopt in conventional means such as the inner increase of trigger reversers, the principle of work of trigger changed into when the CP termination receive the control module output signal by high level during, forward output terminal output high trigger signal to the low level signal saltus step.Accordingly, control module is also needed to do some changes, promptly by setting in advance, make control module when receiving the voltage of voltage regulation of LDO output, control output end (PWR_down) output high level signal, when needs turn-off LDO, send the outer number signal (putting several signals in this case) of deploying by existing control serial ports on the process chip of circuit module place for putting 0 signal, the high level signal of this control output end (PWR_down) output is changed to low level signal, above-mentioned setting in advance also can be realized by conventional means, therefore repeats no more here.
Still be example with the structure that switches off control circuit in embodiment illustrated in fig. 3 below, enumerate a concrete application example.Be example with the mobile call terminal below, enumerate the application example that a kind of LDO shown in Figure 3 switches off control circuit, Fig. 5 shows should be with the concrete structure that switches off control circuit in the example.
Should use in the example, part shown in the frame of broken lines 51 is the particular circuit configurations of LDO inside, mainly comprise voltage conversion circuit 511, executive circuit 512 and grounding circuit 513, the case of external supply voltage is 3 volts, and the voltage of voltage regulation value of setting is 1.2 volts; Vdd 3V represents that supply voltage is input as 3 volts, and vss 3V represents ground connection; Control interface is the SPI in the mobile call terminal; D type flip flop 501, reverser 502, Sheffer stroke gate 504, power reset unit 505, electric pressure converter 503 and external reset signal input block 507.Below only to being elaborated with the internal circuit of LDO in the example.
Comprise NMOS pipe in the grounding circuit 513, its grid is connected with the output terminal of reverser 506, drain with voltage conversion circuit 511 in last divider resistance be connected source ground.As can be seen from Figure 5, if after turn-offing LDO according to mode provided by the invention, if the pipe of the NMOS in the grounding circuit 513 still keeps conducting state, then the divider resistance in the voltage conversion circuit 511 still can consume a part of electric energy, therefore when turn-offing LDO, also need to make above-mentioned NMOS pipe to end.
For realizing this purpose, also increased above-mentioned reverser 506 in the LDO breaking circuit of the present invention, when the forward output terminal Q of d type flip flop end output high level signal, this high level signal becomes the grid of low level signal input NMOS pipe after oppositely through reverser 506, the NMOS pipe is ended, promptly when turn-offing LDO, avoided because the power consumption that grounding circuit 513 causes.
Using the NMOS pipe in certain above-mentioned grounding circuit 513 is a kind of concrete giving an example, and reality also can adopt the PMOS pipe to realize that circuit structure in this case as shown in Figure 6.In this case, the forward output terminal Q of the grid of PMOS pipe and d type flip flop end is connected, and the input end of first divider resistance in drain electrode and the voltage conversion circuit 511 is connected source electrode connection power supply.Therefore under the situation of using the PMOS pipe, during switching off control circuit, LDO of the present invention just do not need to increase reverser 506, this is because the forward output terminal Q of d type flip flop holds when exporting high level signal, this high level signal just can make the PMOS pipe end, and therefore directly the forward output terminal Q end of d type flip flop is exported the grid that is connected to the PMOS pipe and just can realize identical purpose.
In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. switching off control circuit of a low pressure difference linear voltage regulator is characterized in that, this switches off control circuit and is integrated in the circuit module at trunk circuit place, comprising: trigger, low pressure difference linear voltage regulator LDO, control module and reseting module;
Described trigger, what receive that described reseting module sends resets during low level signal, to LDO output low level trigger pip; When receiving the hopping edge of described control module output signal, to LDO output high trigger signal;
Described LDO starts after receiving the low level trigger pip of trigger output, and the voltage of voltage regulation that will be converted to by supply voltage offers described control module; Turn-off after receiving the high trigger signal of trigger output;
Described control module, output signal when receiving the voltage of voltage regulation that LDO provides; When needs turn-off LDO, the described output signal of saltus step.
2. as claimed in claim 1ly switch off control circuit, it is characterized in that described trigger comprises forward output terminal, supply voltage input end, CP input end and reset terminal;
Described supply voltage input end receives input supply voltage, makes trigger in running order;
The low level signal that resets that described reseting module sends sends to described reset terminal;
Described low level trigger pip and high trigger signal to LDO output are by described forward output terminal output;
The hopping edge of described control module output signal outputs to described CP input end.
3. as claimed in claim 2ly switch off control circuit, it is characterized in that described control module comprises:
Control interface receives behind the voltage of voltage regulation that LDO provides to the electric pressure converter output signal; When needs turn-off LDO, saltus step output signal, the output signal behind the electric pressure converter output hopping;
Electric pressure converter is exported after the parameter in the output signal of control interface is converted to the parameter that described trigger is suitable for.
4. as claimed in claim 3ly switch off control circuit, it is characterized in that, described saltus step output signal is to be realized by receiving the several signals of putting of described circuit module outside by described control interface.
5. as claimed in claim 2ly switch off control circuit, it is characterized in that described reseting module comprises:
The power reset unit, after the input of reception supply voltage, the low level signal that will reset outputs to Sheffer stroke gate;
The external reset signal input block receives the low level signal that resets of the outside input of described circuit module, and outputs to Sheffer stroke gate;
Sheffer stroke gate, the low level signal that resets that reset low level signal or the described external reset signal input block of described power reset unit output received carries out outputing to first reverser after the NOT-AND operation;
First reverser, the output signal of described Sheffer stroke gate carried out reverse operating after, export to the reset terminal of described trigger.
6. as claimed in claim 2ly switch off control circuit, it is characterized in that described LDO comprises: voltage conversion circuit, executive circuit and the grounding circuit that constitutes by the NMOS pipe; Also comprise second reverser during this switches off control circuit, the high trigger signal of the forward output terminal of described trigger output is carried out reverse operating after, export to the grid of described NMOS pipe;
Described voltage conversion circuit is made of two above divider resistance series connection, the drain electrode that the end connection power supply after the series connection, the other end connect NMOS pipe in the described grounding circuit; Described voltage conversion circuit is according to the maximum output valve of supply voltage and the value of divider resistance, at the dividing potential drop output point identical with setting the voltage of voltage regulation value to the executive circuit output voltage;
Described executive circuit starts after the low level trigger pip of the forward output terminal output of reception trigger, and the voltage of voltage regulation of voltage transitions for setting with voltage conversion circuit output offers described control module; Turn-off after receiving the high trigger signal of forward output terminal output of described trigger;
The described grounding circuit that is made of the NMOS pipe, the grid of NMOS pipe is connected source ground with the output terminal of second reverser.
7. as claimed in claim 2ly switch off control circuit, it is characterized in that described LDO comprises: voltage conversion circuit, executive circuit and the grounding circuit that constitutes by the PMOS pipe;
Described voltage conversion circuit is made of two above resistance series connection, and the end after the series connection connects drain electrode, the other end ground connection of PMOS pipe in the described grounding circuit; Described voltage conversion circuit is according to the maximum output valve of supply voltage and the value of divider resistance, at the dividing potential drop output point identical with setting the voltage of voltage regulation value to the executive circuit output voltage;
Described executive circuit starts after the low level trigger pip of the forward output terminal output of reception trigger, and the voltage of voltage regulation of voltage transitions for setting with voltage conversion circuit output offers described control module; Turn-off after receiving the high trigger signal of forward output terminal output of described trigger;
The described grounding circuit that constitutes by the PMOS pipe, the grid of PMOS pipe is connected with the forward output terminal of described trigger, and source electrode connects power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100390558A CN101299157B (en) | 2008-06-16 | 2008-06-16 | Switch off control circuit of low-voltage difference linear voltage stabilizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100390558A CN101299157B (en) | 2008-06-16 | 2008-06-16 | Switch off control circuit of low-voltage difference linear voltage stabilizer |
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| Publication Number | Publication Date |
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| CN101299157A CN101299157A (en) | 2008-11-05 |
| CN101299157B true CN101299157B (en) | 2010-06-30 |
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| CN2008100390558A Expired - Fee Related CN101299157B (en) | 2008-06-16 | 2008-06-16 | Switch off control circuit of low-voltage difference linear voltage stabilizer |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103138723B (en) * | 2013-01-25 | 2015-10-07 | 无锡中科龙泽信息科技有限公司 | The circuit of a kind of pair of level triggers reset and method |
| CN103178827B (en) * | 2013-02-26 | 2017-06-16 | 上海华虹宏力半导体制造有限公司 | Deadlock-free circuit |
| CN107196352B (en) * | 2016-03-15 | 2022-05-06 | 法雷奥汽车内部控制（深圳）有限公司 | Battery cell control circuit |
| CN113472341B (en) * | 2020-03-31 | 2024-04-02 | 上海钛方科技有限公司 | Control circuit |
| CN113093853B (en) * | 2021-04-15 | 2022-08-23 | 东北大学 | Improved LDO circuit for realizing low input/output voltage difference in low-voltage starting process |
| CN114245522A (en) * | 2021-12-23 | 2022-03-25 | 芜湖雄狮汽车科技有限公司 | Multifunctional microcontroller and vehicle |
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