Power consumption control circuit, low dropout linear voltage regulator chip and electronic device

Abstract

The application discloses a power consumption control circuit, a low-dropout linear voltage stabilizing chip and electronic equipment. The power consumption control circuit comprises a voltage conversion module, a comparison module, a driving module, a power consumption limiting module and a control module. The voltage conversion module is used for receiving an input voltage and generating a current; the comparison module is used for obtaining a comparison result of the input voltage and an output voltage according to the sizes of the input voltage and a set output voltage; the driving module is used for outputting a first driving signal or a second driving signal according to the comparison result; the power consumption limiting module is used for limiting the power consumption of the power consumption control circuit according to the first driving signal; and the control module is used for outputting the set output voltage of the low-dropout linear voltage stabilizing chip according to the second driving signal. The power consumption limiting module is used for limiting the power consumption when the input voltage is smaller than the set output voltage, thereby solving the problem of large static power consumption of the low-dropout linear voltage stabilizing chip when the input voltage is smaller than the set output value.

Description

Technical Field

[0001] This application relates to the field of chip application technology, and in particular to a power consumption control circuit, a low dropout linear regulator chip, and an electronic device. Background Technology

[0002] In recent years, with the development of portable mobile devices such as smartphones, tablets, and smartwatches, low dropout regulators (LDOs) have also experienced rapid growth. LDOs can provide a stable voltage to a device that remains unchanged regardless of load and supply voltage. Because portable devices cannot carry large batteries, high power consumption is required for LDO chips. However, the issue of excessive static power consumption when the input voltage is lower than the set output value has received little attention and is a problem that urgently needs to be addressed. Summary of the Invention

[0003] In view of this, the present invention aims to at least partially solve one of the problems in the related art. Therefore, the object of this application is to provide a power consumption control circuit, a low-dropout linear regulator chip, and an electronic device.

[0004] This application provides a power consumption control circuit for a low-dropout linear regulator chip. The power consumption control circuit includes a voltage conversion module, a comparison module, a driving module, a power consumption limiting module, and a control module. The voltage conversion module is connected to the comparison module, the driving module is connected to a first terminal of the comparison module, the second terminal of the comparison module is connected to an output voltage, the power consumption limiting module is connected to the driving module, and the control module is connected to the power consumption limiting module. The voltage conversion module receives an input voltage and generates a current. The comparison module compares the input voltage with a set output voltage to obtain a comparison result between the input voltage and the output voltage. The driving module outputs a first driving signal or a second driving signal based on the comparison result. The power consumption limiting module limits the power consumption of the low-dropout linear regulator chip based on the first driving signal. The control module outputs a set output voltage of the low-dropout linear regulator chip based on the second driving signal.

[0005] Thus, the power consumption control circuit of this application limits power consumption when the input voltage is less than the set output voltage through the power consumption limiting module, thereby solving the problem of excessive static power consumption of low dropout linear regulator chips when the input voltage is less than the set output value.

[0006] In some embodiments, the voltage conversion module includes a first high-voltage transistor, a second high-voltage transistor, a third high-voltage transistor, and a first current source. The first terminals of both the first and second high-voltage transistors are connected to a voltage input terminal. The gate of the first high-voltage transistor is connected to the gate of the second high-voltage transistor. The second terminal of the first high-voltage transistor is connected to the first terminal of the third high-voltage transistor. The second terminal of the third high-voltage transistor is connected to the first terminal of the first current source. The second terminal of the first current source is grounded. The second terminal of the second high-voltage transistor outputs current.

[0007] Thus, when the input voltage is less than the set output voltage, the voltage conversion module in the power consumption control circuit of this application can only act as a current mirror to generate the current required by the power consumption control circuit; when the input voltage is higher than the set output voltage, the voltage conversion module can convert the input voltage to a low voltage, thereby protecting other low-voltage devices in the power consumption control circuit.

[0008] In some embodiments, the comparison module includes a fourth low-voltage transistor, a fifth low-voltage transistor, a second current source, and a third current source. The first terminal of the fourth low-voltage transistor is connected to the second terminal of the second high-voltage transistor, the second terminal of the fourth low-voltage transistor is connected to the first terminal of the second current source, the first terminal of the fifth low-voltage transistor is connected to a voltage output terminal, the second terminal of the fifth low-voltage transistor is connected to the first terminal of the third current source, the gate of the fourth low-voltage transistor is connected to the gate of the fifth low-voltage transistor, and the second terminals of the second and third current sources are grounded.

[0009] In this way, the comparison module can obtain the magnitude of the input voltage and the output voltage based on the magnitude of the input voltage and the set output voltage, and output different level signals to control whether the subsequent power consumption limiting module works normally, so as to achieve the power consumption limiting effect when the input voltage is less than the set output voltage.

[0010] In some embodiments, the driving module includes a sixth low-voltage transistor, a seventh low-voltage transistor, a fourth current source, and a fifth current source. The gate of the sixth low-voltage transistor is connected to the second terminal of the fourth low-voltage transistor and the first terminal of the second current source; the first terminal of the sixth low-voltage transistor is connected to the first terminal of the fourth current source and the gate of the seventh low-voltage transistor; the second terminal of the sixth low-voltage transistor is grounded. The first terminal of the seventh low-voltage transistor is connected to the second terminal of the fourth current source; the second terminal of the seventh low-voltage transistor is connected to the first terminal of the fifth current source and outputs the first driving signal or the second driving signal; the second terminal of the fifth current source is grounded.

[0011] Thus, the driving module of this application can output a first driving signal or a second driving signal according to the low or high level output of the comparison module, thereby controlling whether the power consumption limiting module is working properly.

[0012] In some embodiments, the power limiting module includes an eighth low-voltage transistor and a sixth current source. The gate of the eighth low-voltage transistor is connected to the second terminal of the seventh low-voltage transistor to receive the first drive signal or the second drive signal; the first terminal of the eighth low-voltage transistor is connected to the first terminal of the sixth current source, the second terminal of the eighth low-voltage transistor and the second terminal of the sixth current source are grounded, and the second terminal of the sixth current source is connected to a voltage output terminal.

[0013] Thus, the power consumption limiting module of the power consumption control circuit of this application can limit power consumption when the input voltage is less than the set output voltage, thereby solving the problem of excessive static power consumption of low dropout linear regulator chips when the input voltage is less than the set output value.

[0014] In some embodiments, when the comparison result output by the comparison module is that the input voltage of the power consumption control circuit is equal to the output voltage, the driving module outputs a first driving signal, which is a low-level signal; when the comparison result output by the comparison module is that the input voltage is greater than the output voltage, the driving module outputs a second driving signal, which is a high-level signal.

[0015] Thus, the driving module of this application can output different driving signals according to different comparison results of the comparison module, thereby controlling whether the power consumption limiting module is working properly.

[0016] In some implementations, after the eighth low-voltage transistor receives the first drive signal, the eighth low-voltage transistor is in a turn-off state, and the power consumption limiting module limits the current of the power consumption control circuit according to the sixth current source, so as to limit the power consumption of the low dropout linear regulator chip.

[0017] Thus, the power consumption limiting module of this application can limit the current of the power consumption control circuit according to the sixth current source when the eighth low-voltage transistor is in the off state, so as to limit the power consumption of the low dropout linear regulator chip.

[0018] In some embodiments, the control module includes a fourth high-voltage transistor, a fifth high-voltage transistor, a sixth high-voltage transistor, an operational amplifier, a ninth low-voltage transistor, a first feedback resistor, and a second feedback resistor. The first terminal of the fourth high-voltage transistor and the first terminal of the fifth high-voltage transistor are both connected to a voltage input terminal. The second terminal of the fourth high-voltage transistor is connected to the first terminal of the sixth high-voltage transistor, and the gate of the fourth high-voltage transistor is connected to the gate of the fifth high-voltage transistor. The second terminal of the fifth high-voltage transistor is connected to the first feedback resistor and the second feedback resistor, which are connected in series. The second terminal of the fifth high-voltage transistor is connected to a voltage output terminal. The gate of the sixth high-voltage transistor and the power supply terminal of the operational amplifier are both connected to a power source. The second terminal of the sixth high-voltage transistor is connected to the first terminal of the ninth low-voltage transistor. The gate of the ninth low-voltage transistor is connected to the output terminal of the operational amplifier. The second terminal of the ninth low-voltage transistor is connected to the first terminal of the sixth current source and the first terminal of the eighth low-voltage transistor. The second terminal of the operational amplifier is grounded.

[0019] Thus, the power consumption control circuit of this application can output the final output voltage according to the control module.

[0020] This application also provides a low-dropout linear regulator chip. The low-dropout linear regulator chip includes the power control circuit described in any of the above embodiments.

[0021] The low-dropout linear regulator chip of this application uses a power limiting module of a power control circuit to limit power consumption when the input voltage is less than the set output voltage, thereby solving the problem of excessive static power consumption of the low-dropout linear regulator chip when the input voltage is less than the set output value.

[0022] This application also provides an electronic device. The electronic device includes the low-dropout linear regulator chip described in the above embodiments.

[0023] The low-dropout linear regulator chip of this application uses a power consumption control circuit, which can limit power consumption when the input voltage is less than the set output voltage through a power consumption limiting module, thereby solving the problem of excessive static power consumption of the low-dropout linear regulator chip when the input voltage is less than the set output value.

[0024] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0026] Figure 1 This is a partial structural schematic diagram of the power consumption control circuit in some embodiments of this application;

[0027] Figure 2 This is a partial structural schematic diagram of the power consumption control circuit in some embodiments of this application;

[0028] Figure 3 These are current and voltage diagrams corresponding to the low-dropout linear regulator chip in the power control circuit of this application, which are not used in related technologies.

[0029] Figure 4 These are schematic diagrams of the current and voltage corresponding to the low-dropout linear regulator chip in the power consumption control circuit of this application. Detailed Implementation

[0030] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0031] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0033] The following disclosure provides many different implementations or examples for carrying out different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or reference letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0034] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0035] Please see Figure 1 and Figure 2 This application provides a power consumption control circuit 100 for a low-dropout linear regulator chip. The power consumption control circuit 100 includes a voltage conversion module 110, a comparator module 120, a driver module 130, a power consumption limiting module 140, and a control module 150. The voltage conversion module 110 is connected to the comparator module 120, the driver module 130 is connected to the comparator module 120, the power consumption limiting module 140 is connected to the driver module 130, and the control module 150 is connected to the power consumption limiting module 140.

[0036] The voltage conversion module 110 receives the input voltage Vin and generates a current I1. Understandably, when the input voltage Vin is less than the set output voltage Vout (normal), the voltage conversion module 110 does not perform a high-to-low voltage level conversion; it merely acts as a current mirror, generating the current I1 required by the power consumption control circuit 100. Furthermore, when the input voltage Vin is higher than the set output voltage Vout (normal), the voltage conversion module 110 can convert the input voltage Vin to a lower voltage, thereby protecting other low-voltage devices in the power consumption control circuit 100.

[0037] For the setting of the output voltage Vout(normal), for a low-dropout linear regulator chip that converts high voltage to low voltage, for example, if the input voltage is 24V, then the corresponding output voltage Vout(normal) is set to 5V.

[0038] The comparison module 120 is used to obtain a comparison result between the input voltage Vin and the set output voltage Vout(normal). Specifically, when the comparison module 120 finds that the input voltage Vin < the set output voltage Vout(normal), the comparison result of the comparison module 120 is that the input voltage Vin = the output voltage Vout, where Vin is the input voltage of the low-dropout linear regulator chip, Vout is the output voltage of the low-dropout linear regulator chip, and Vout(normal) is the set output voltage of the low-dropout linear regulator chip. When the input voltage Vin ≥ the set output voltage Vout(normal), Vout = Vout(normal), and the comparison result of the comparison module 120 is that the input voltage Vin > the output voltage Vout.

[0039] The drive module 130 is used to output a first drive signal or a second drive signal based on the comparison result. The first drive signal is a low-level signal, and the second drive signal is a high-level signal. When the comparison result is that the input voltage Vin equals the output voltage Vout, the drive module 130 outputs the first drive signal. When the comparison result is that the input voltage Vin is greater than the output voltage Vout, the drive module 130 outputs the second drive signal. Both the first and second drive signals can be represented as... Figure 1 or Figure 2 Driver signal.

[0040] The power consumption limiting module 140 is used to limit the power consumption of the low-dropout linear regulator chip according to the first drive signal. The power consumption limiting module 140 can reduce power consumption by limiting the current at the output voltage terminal, thereby limiting the power consumption of the low-dropout linear regulator chip.

[0041] The control module 150 is used to output the set output voltage Vout(normal) of the low dropout linear regulator chip according to the second drive signal. That is to say, when the control module 150 is working, the power consumption limiting module 140 is out of working state, and the control module 150 can ensure that the low dropout linear regulator chip can output the set output voltage normally when the input voltage is higher than the set output voltage.

[0042] Thus, the power consumption control circuit 100 of this application limits power consumption when the input voltage is less than the set output voltage through the power consumption limiting module 140, thereby solving the problem of excessive static power consumption of the low dropout linear regulator chip when the input voltage is less than the set output value.

[0043] In some implementations, please refer to Figure 1The voltage conversion module 110 includes a first high-voltage transistor HM1, a second high-voltage transistor HM2, a third high-voltage transistor HM3, and a first current source E1. The first terminal 11 of the first high-voltage transistor HM1 and the first terminal 21 of the second high-voltage transistor HM2 are both connected to the voltage input terminal Vin. The gate of the first high-voltage transistor HM1 is connected to the gate of the second high-voltage transistor HM2. The second terminal 12 of the first high-voltage transistor HM1 is connected to the first terminal 31 of the third high-voltage transistor HM3. The second terminal 32 of the third high-voltage transistor HM3 is connected to the first terminal of the first current source E1. The second terminal of the first current source E1 is grounded. The second terminal 22 of the second high-voltage transistor HM2 outputs current. Figure 1 The first low-voltage transistor LM1 and the second low-voltage transistor LM2 in the chip are transistors that work together with other modules of the chip, and will not be described in detail here.

[0044] Specifically, the first high-voltage transistor HM1 can be a P-type transistor, the second high-voltage transistor HM2 can be a P-type transistor, and the third high-voltage transistor HM3 can be an n-type transistor. The first current source E1 can generate a current I1 and keep the current in the branch of the first high-voltage transistor HM1 constant.

[0045] The first high-voltage transistor HM1 and the second high-voltage transistor HM2 are equivalent to a current mirror. Therefore, the current in the branch of the second high-voltage transistor HM2 is equal to the current in the branch of the first high-voltage transistor HM1.

[0046] That is, as mentioned above, when the input voltage Vin is less than the set output voltage Vout (normal), the voltage conversion module 110 will not perform the high-voltage to low-voltage level conversion function, but will only act as a current mirror to generate the current I1 required by the power consumption control circuit 100.

[0047] Among them, the first high-voltage transistor HM1 and the second high-voltage transistor HM2 are capable of withstanding high voltage.

[0048] When the input voltage Vin is higher than the set output voltage Vout (normal), the voltage conversion module 110 can convert the input voltage Vin to a lower voltage, thereby protecting other low-voltage devices in the power consumption control circuit 100. Understandably, the gate of the third high-voltage transistor HM3 can be connected to a buck converter with a voltage of 5V. When the input voltage Vin is high, the buck converter can convert the input voltage Vin to a low voltage supplied internally by the power consumption control circuit 100, thereby reducing the power consumption of the power consumption control circuit 100. The buck converter may include a voltage regulator, which can subtract excess voltage from the input voltage Vin to generate a regulated output voltage Vout for transistors or field-effect transistors operating in the saturation region.

[0049] Thus, when the input voltage Vin is less than the set output voltage Vout (normal), the voltage conversion module 110 in the power consumption control circuit 100 of this application can only act as a current mirror to generate the current I1 required by the power consumption control circuit 100; when the input voltage Vin is higher than the set output voltage Vout (normal), the voltage conversion module 110 can convert the input voltage Vin to a low voltage, thereby protecting other low-voltage devices in the power consumption control circuit 100.

[0050] In some embodiments, the comparator module 120 includes a fourth low-voltage transistor LM4, a fifth low-voltage transistor LM5, a second current source E2, and a third current source E3. The first terminal 41 of the fourth low-voltage transistor LM4 is connected to the second terminal 51 of the second high-voltage transistor LM5, and the second terminal 42 of the fourth low-voltage transistor LM4 is connected to the first terminal of the second current source E2, such that the branch containing the fourth low-voltage transistor LM4 is connected to the input voltage Vin. The first terminal 51 of the fifth low-voltage transistor LM5 is connected to the voltage output terminal Vout, and the second terminal 52 of the fifth low-voltage transistor LM5 is connected to the first terminal of the third current source E3. The gate of the fourth low-voltage transistor LM4 is connected to the gate of the fifth low-voltage transistor LM5, and the second terminals of the second current source E2 and the third current source E3 are grounded.

[0051] That is, both the fourth low-voltage transistor LM4 and the fifth low-voltage transistor LM5 are low-voltage devices, and both can be p-type transistors.

[0052] At this point, the fourth low-voltage transistor LM4 and the fifth low-voltage transistor LM5 in the comparator module 120 form a current mirror, meaning that the current generated by the third current source E3 is equal to I3, which is equal to the current generated by the second current source E2, I2. The comparator module 120 outputs current I2 to control the drive module 130 to issue a drive signal.

[0053] When the comparison module 120 finds that the input voltage Vin is less than the set output voltage Vout (normal), the comparison result of the comparison module 120 is that the input voltage Vin = the output voltage Vout. At this time, the current I2 output by the comparison module 120 is small, which makes the comparison module 120 output a low level, causing the drive module 130 to issue a first drive signal, i.e., a low level signal. For example, the first drive signal is driver=0, which can control the power consumption limiting module 140 to start working and achieve the effect of limiting power consumption.

[0054] When the input voltage Vin is greater than or equal to the set output voltage Vout(normal), the output voltage Vout = the set output voltage Vout(normal). In this case, the comparison result of the comparison module 120 is that the input voltage Vin > the output voltage Vout. At this time, the current output by the comparison module 120 is the same as the current I2 generated by the second current source E2, which is a copy of the current magnitude of I3. The module outputs a high level signal, causing the drive module 130 to issue a second drive signal, i.e., a high-level signal. This allows the power consumption limiting module 140 to remain inactive, and the output voltage Vout is the set output voltage Vout(normal).

[0055] Thus, the comparison module 120 can obtain the magnitudes of the input voltage Vin and the output voltage Vout based on the magnitudes of the input voltage and the set output voltage, and output different level signals to control whether the subsequent power consumption limiting module 140 is working properly, thereby achieving the power consumption limiting effect when the input voltage is less than the set output voltage.

[0056] In some embodiments, the drive module 130 includes a sixth low-voltage transistor LM6, a seventh low-voltage transistor LM7, a fourth current source E4, and a fifth current source E5. The gate of the sixth low-voltage transistor LM6 is connected to the second terminal 42 of the fourth low-voltage transistor LM4 and the first terminal of the second current source E2. The first terminal 61 of the sixth low-voltage transistor LM6 is connected to the first terminal of the fourth current source E4 and the gate of the seventh low-voltage transistor LM7. The second terminal 62 of the sixth low-voltage transistor LM6 is grounded. The first terminal 71 of the seventh low-voltage transistor LM7 is connected to the second terminal of the fourth current source E4. The second terminal 72 of the seventh low-voltage transistor LM7 is connected to the first terminal of the fifth current source E5 and outputs a first drive signal or a second drive signal. The second terminal of the fifth current source E5 is grounded. Both the sixth low-voltage transistor LM6 and the seventh low-voltage transistor LM7 are low-voltage devices; the sixth low-voltage transistor LM6 is an n-type transistor, and the seventh low-voltage transistor LM7 can be a p-type transistor.

[0057] Specifically, when the comparison module 120 finds that the input voltage Vin is less than the set output voltage Vout (normal), the comparison result of the comparison module 120 is that the input voltage Vin = the output voltage Vout. At this time, the comparison module 120 outputs a low level, causing the drive module 130 to issue the first drive signal, i.e., a low-level signal. More specifically, the drive module 130 outputs the first drive signal by having a current I2 or an equal current I3 flowing into the gate of the sixth low-voltage transistor LM6.

[0058] When the input voltage Vin is greater than or equal to the set output voltage Vout(normal), the output voltage Vout = the set output voltage Vout(normal). At this time, the comparison result of the comparison module 120 is that the input voltage Vin > the output voltage Vout. The current output by the comparison module 120 is the current I2 generated by the second current source E2, and it outputs a high level, causing the drive module 130 to issue a second drive signal, i.e., a high-level signal. Specifically, at this time, the gate current I2 flowing into the sixth low-voltage transistor LM6 in the drive module 130 causes the drive module 130 to start working and output the second drive signal.

[0059] Thus, the driving module 130 of this application can output a first driving signal or a second driving signal according to the low level or high level output of the comparison module 120, thereby controlling whether the power consumption limiting module 140 is working properly.

[0060] In some embodiments, the power limiting module 140 includes an eighth low-voltage transistor LM8 and a sixth current source E6. The gate of the eighth low-voltage transistor LM8 is connected to the second terminal 72 of the seventh low-voltage transistor LM7 to receive a first drive signal or a second drive signal. The first terminal 81 of the eighth low-voltage transistor LM8 is connected to the first terminal of the sixth current source E6, and the second terminal 82 of the eighth low-voltage transistor LM8 and the second terminal of the sixth current source E6 are grounded. The second terminal of the sixth current source E6 is connected to a voltage output terminal. The eighth low-voltage transistor LM8 is a low-voltage device and can be an n-type transistor.

[0061] After receiving the first drive signal, i.e., the low-level signal, the eighth low-voltage transistor LM8 is in the off state. The power consumption limiting module 140 limits the current of the power consumption control circuit 100 according to the sixth current source E6, so as to limit the power consumption of the low dropout linear regulator chip.

[0062] In some embodiments, the control module 150 includes a fourth high-voltage transistor HM4, a fifth high-voltage transistor HM5, a sixth high-voltage transistor HM6, an operational amplifier I0, a ninth low-voltage transistor LM9, a first feedback resistor R1, and a second feedback resistor R2. The fourth high-voltage transistor HM4 and the fifth high-voltage transistor HM5 can be P-type transistors, and the sixth high-voltage transistor HM6 can be an n-type transistor.

[0063] The first terminal 1 of the fourth high-voltage transistor HM4 and the first terminal of the fifth high-voltage transistor HM5 are both connected to the voltage input terminal Vin. The second terminal 2 of the fourth high-voltage transistor HM4 is connected to the first terminal 5 of the sixth high-voltage transistor HM6. The gate of the fourth high-voltage transistor HM4 is connected to the gate of the fifth high-voltage transistor HM5.

[0064] The second terminal 3 of the fifth high-voltage transistor HM5 is connected to the first feedback resistor R1 and the second feedback resistor R2. The first feedback resistor R1 and the second feedback resistor R2 are connected in series, and the second terminal 4 of the fifth high-voltage transistor HM5 is connected to the voltage output terminal Vout.

[0065] The gate of the sixth high-voltage transistor HM6 and the power supply terminal of the operational amplifier I0 are both connected to power supply V2. The voltage of V2 can be 5V. Power supply V2 can provide voltage for the sixth high-voltage transistor HM6 and the operational amplifier I0.

[0066] The second terminal (6) of the sixth high-voltage transistor HM6 is connected to the first terminal (7) of the ninth low-voltage transistor LM9. The gate of the ninth low-voltage transistor LM9 is connected to the output terminal of operational amplifier I0. The second terminal (8) of the ninth low-voltage transistor LM9 is connected to the first terminal of the sixth current source E6 and the first terminal of the eighth low-voltage transistor LM8. The second terminal of operational amplifier I0 is grounded.

[0067] Among them, the fourth high-voltage transistor HM4, the fifth high-voltage transistor HM5, and the sixth high-voltage transistor HM6 are all high-voltage resistant devices, while the ninth low-voltage transistor LM9 is a low-voltage device. The fourth high-voltage transistor HM4 and the fifth high-voltage transistor HM5 can both be P-type transistors, while the sixth high-voltage transistor HM6 can be an n-type transistor.

[0068] An operational amplifier (I0) is a differential amplifier characterized by high input resistance, low output resistance, and high open gain, and it can amplify the voltage difference between the positive and negative input pins.

[0069] Specifically, such as Figure 2 As shown, for cases where the input voltage is less than the set output voltage, taking Vout(normal) = 5V and Vin = 4V as an example, the working principle of the power consumption control circuit 100 of this application is as follows: When the chip is powered on, the input voltage Vin = 4V, the main loop formed by the control module 150 in the power consumption control circuit 100 does not work, and the output voltage Vout = the input voltage Vin = 4V. At this time, the comparison module 120 starts to work, outputting a low-level signal driver = 0, controlling the eighth low-voltage transistor LM8 of the power consumption limiting module 140 to turn off, and the sixth current source E6 is connected to the circuit of the main loop formed by the control module 150, thereby limiting the static power consumption of the HM4 branch to the power consumption corresponding to the current I6 generated by the sixth current source E6, thereby limiting the power consumption of the fifth high-voltage transistor HM5.

[0070] The sixth current source, E6, can be completely turned off without affecting the static power consumption of the low-dropout linear regulator chip during normal operation. Furthermore, when the low-dropout linear regulator chip is in normal operating condition, the sixth current source, E6, can be completely turned off without affecting the chip's load-carrying capacity.

[0071] In addition, when the power consumption control circuit 100 of this application is applied to electronic devices with lithium batteries, if the battery is over-discharged when under load, and the input voltage that can be provided is less than the set output voltage, the power consumption control circuit 100 of this application can prevent the load from continuing to draw current from the battery through the current limiting function of the power consumption limiting module 140, thereby affecting the battery life and reliability.

[0072] Please see Figure 3 , Figure 3 This diagram illustrates how the power consumption of a low-dropout linear regulator chip is limited by the power limiting module 140. Figure 3 As shown, the power consumption limiting module 140 can limit the HM4 branch current to around tens of nA, thereby...

[0073] Please see Figure 4 , Figure 4 This diagram illustrates the power consumption limitation of a low-dropout linear regulator chip without the power limiting module 140. It can be understood that without the power limiting module 140, which consists of the eighth low-voltage transistor LM8 and the sixth current source E6, limiting power consumption, the power consumption of the low-dropout linear regulator chip would be as follows: Figure 4 As shown, it can achieve a current consumption of several hundred μA.

[0074] In addition, after the eighth low-voltage transistor LM8 receives the second drive signal, the eighth low-voltage transistor LM8 is in the conducting state, the power consumption limiting module 140 exits the working state, and the fifth high-voltage transistor HM5 outputs the set output voltage Vout(normal) of the low dropout linear regulator chip.

[0075] That is, when the input voltage Vin is greater than or equal to the set output voltage Vout (normal), the drive signal is the second drive signal, which can control the power consumption limiting module 140 to exit the working state and then output the set output voltage Vout (normal), ensuring the operation of the low dropout linear regulator chip circuit. In other words, the power consumption control circuit 100 of this application can be applied to the low dropout linear regulator chip circuit with high voltage input.

[0076] This application also provides a low-dropout linear regulator chip. The low-dropout linear regulator chip includes the power consumption control circuit 100 described in the above embodiments. The specific structure of the power consumption control circuit 100 is as described above and will not be repeated here.

[0077] The low dropout linear regulator chip of this application uses the power consumption limiting module 140 of the power consumption control circuit 100 to limit power consumption when the input voltage is less than the set output voltage, thereby solving the problem of excessive static power consumption of the low dropout linear regulator chip when the input voltage is less than the set output value.

[0078] This application also provides an electronic device. The electronic device includes the low-dropout linear regulator chip described in the above embodiments. The electronic devices of this application include devices such as mobile phones, tablet computers, and smartwatches.

[0079] The low-dropout linear regulator chip of this application uses a power consumption control circuit, which can limit power consumption when the input voltage is less than the set output voltage through a power consumption limiting module, thereby solving the problem of excessive static power consumption of the low-dropout linear regulator chip when the input voltage is less than the set output value.

[0080] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A power consumption control circuit for a low-dropout linear regulator chip, characterized in that, The power consumption control circuit includes a voltage conversion module, a comparison module, a drive module, a power consumption limiting module, and a control module; the voltage conversion module is connected to the comparison module, the drive module is connected to the first terminal of the comparison module, the second terminal of the comparison module is connected to the output voltage, the power consumption limiting module is connected to the drive module, and the control module is connected to the power consumption limiting module. The voltage conversion module is used to receive input voltage and generate current; The comparison module is used to obtain a comparison result between the input voltage and the output voltage based on the magnitude of the input voltage and the set output voltage. The driving module is used to output a first driving signal or a second driving signal according to the comparison result; The power consumption limiting module is used to limit the power consumption of the low dropout linear regulator chip according to the first drive signal. The control module is used to output the set output voltage of the low dropout linear regulator chip according to the second drive signal; When the comparison result output by the comparison module is that the input voltage of the power consumption control circuit is equal to the output voltage, the driving module outputs a first driving signal, which is a low-level signal. When the comparison result output by the comparison module is that the input voltage is greater than the output voltage, the driving module outputs a second driving signal, which is a high-level signal.

2. The power consumption control circuit according to claim 1, characterized in that, The voltage conversion module includes a first high-voltage transistor, a second high-voltage transistor, a third high-voltage transistor, and a first current source. The first terminals of the first and second high-voltage transistors are both connected to the voltage input terminal. The gate of the first high-voltage transistor is connected to the gate of the second high-voltage transistor. The second terminal of the first high-voltage transistor is connected to the first terminal of the third high-voltage transistor. The second terminal of the third high-voltage transistor is connected to the first terminal of the first current source. The second terminal of the first current source is grounded. The second terminal of the second high-voltage transistor outputs current.

3. The power consumption control circuit according to claim 2, characterized in that, The comparison module includes a fourth low-voltage transistor, a fifth low-voltage transistor, a second current source, and a third current source. The first terminal of the fourth low-voltage transistor is connected to the second terminal of the second high-voltage transistor, and the second terminal of the fourth low-voltage transistor is connected to the first terminal of the second current source. The first terminal of the fifth low-voltage transistor is connected to the voltage output terminal, and the second terminal of the fifth low-voltage transistor is connected to the first terminal of the third current source. The gate of the fourth low-voltage transistor is connected to the gate of the fifth low-voltage transistor. The second terminals of the second current source and the second terminals of the third current source are grounded.

4. The power consumption control circuit according to claim 3, characterized in that, The driving module includes a sixth low-voltage transistor, a seventh low-voltage transistor, a fourth current source, and a fifth current source. The gate of the sixth low-voltage transistor is connected to the second terminal of the fourth low-voltage transistor and the first terminal of the second current source. The first terminal of the sixth low-voltage transistor is connected to the first terminal of the fourth current source and the gate of the seventh low-voltage transistor. The second terminal of the sixth low-voltage transistor is grounded. The first terminal of the seventh low-voltage transistor is connected to the second terminal of the fourth current source. The second terminal of the seventh low-voltage transistor is connected to the first terminal of the fifth current source and outputs the first driving signal or the second driving signal. The second terminal of the fifth current source is grounded.

5. The power consumption control circuit according to claim 4, characterized in that, The power consumption limiting module includes an eighth low-voltage transistor and a sixth current source. The gate of the eighth low-voltage transistor is connected to the second terminal of the seventh low-voltage transistor to receive the first drive signal or the second drive signal. The first terminal of the eighth low-voltage transistor is connected to the first terminal of the sixth current source, the second terminal of the eighth low-voltage transistor and the second terminal of the sixth current source are grounded, and the second terminal of the sixth current source is connected to the voltage output terminal.

6. The power consumption control circuit according to claim 5, characterized in that, After receiving the first drive signal, the eighth low-voltage transistor is in a turned-off state. The power consumption limiting module limits the current of the power consumption control circuit according to the sixth current source, so as to limit the power consumption of the low dropout linear regulator chip.

7. The power consumption control circuit according to claim 5, characterized in that, The control module includes a fourth high-voltage transistor, a fifth high-voltage transistor, a sixth high-voltage transistor, an operational amplifier, a ninth low-voltage transistor, a first feedback resistor, and a second feedback resistor. The first terminal of the fourth high-voltage transistor and the first terminal of the fifth high-voltage transistor are both connected to the voltage input terminal. The second terminal of the fourth high-voltage transistor is connected to the first terminal of the sixth high-voltage transistor. The gate of the fourth high-voltage transistor is connected to the gate of the fifth high-voltage transistor. The second terminal of the fifth high-voltage transistor is connected to the first feedback resistor and the second feedback resistor, the first feedback resistor and the second feedback resistor are connected in series, and the second terminal of the fifth high-voltage transistor is connected to the voltage output terminal. The gate of the sixth high-voltage transistor and the power supply terminal of the operational amplifier are both connected to a power source, and the second terminal of the sixth high-voltage transistor is connected to the first terminal of the ninth low-voltage transistor. The gate of the ninth low-voltage transistor is connected to the output terminal of the operational amplifier, the second terminal of the ninth low-voltage transistor is connected to the first terminal of the sixth current source and the first terminal of the eighth low-voltage transistor, and the second terminal of the operational amplifier is grounded.

8. A low-dropout linear voltage regulator chip, characterized in that, Includes the power consumption control circuit as described in any one of claims 1 to 7.

9. An electronic device, characterized in that, Includes the low dropout linear regulator chip as described in claim 8.

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