Linear voltage stabilizing circuit, chip and electronic equipment

Abstract

The embodiment of the invention provides a linear voltage stabilizing circuit, a chip and electronic equipment, the linear voltage stabilizing circuit comprises a first channel module, a second channel module and a channel selection module, through the first channel module and the second channel module, a first power supply voltage and a second power supply voltage of multi-channel input can be supported; the channel selection module controls the first channel module and the second channel module and can select the higher one of the first power supply voltage and the second power supply voltage as the target power supply voltage, so that the higher voltage is selectively output from the multi-channel high power supply voltage. Therefore, the application of a high-voltage PD (Power Delivery) fast charging chip, automobile industrial electronics and other multi-channel high-voltage environments can be realized.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to a linear voltage stabilization circuit, a chip and an electronic device. Background Art

[0002] As a commonly used power management circuit, linear regulators have been developed for a long time. However, in recent years, the service objects of power management circuits have shifted from portable electronic devices to automotive industry electronics and other fields, and the application conditions have also shifted from low voltage environments to high voltage environments.

[0003] However, most linear regulators use a single power supply voltage input channel, which cannot meet the application requirements of multiple channels with high power supply voltage channels. Summary of the invention

[0004] In view of the above problems, the embodiments of the present application provide a linear voltage regulator circuit, a chip and an electronic device to solve the technical problem of selecting a higher output voltage among multi-channel high power supply voltages.

[0005] In a first aspect, an embodiment of the present application provides a linear voltage regulator circuit, which includes a first channel module, a second channel module and a channel selection module, the first channel module is used to receive a first power supply voltage as a target power supply voltage; the second channel module is used to receive a second power supply voltage; the channel selection module is used to control the first channel module and the second channel module to use the higher voltage of the first power supply voltage and the second power supply voltage as the target power supply voltage.

[0006] In a second aspect, an embodiment of the present application further provides a chip, which includes the above-mentioned linear voltage stabilization circuit.

[0007] In a third aspect, an embodiment of the present application further provides an electronic device, which includes a device body and the above-mentioned linear voltage stabilization circuit or chip arranged in the device body.

[0008] The linear voltage stabilization circuit, chip and electronic device provided in the embodiments of the present application can support the first power supply voltage and the second power supply voltage of multi-channel input through the first channel module and the second channel module. The channel selection module controls the first channel module and the second channel module, and can select the higher voltage of the first power supply voltage and the second power supply voltage as the target power supply voltage, thereby realizing the selection of the output of the higher voltage in the multi-channel high power supply voltage, which is conducive to the application in multi-channel high voltage environments such as high-voltage PD (Power Delivery) fast charging chips and automotive industrial electronics.

[0009] These and other aspects of the present application will become more clearly understood in the description of the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0011] Figure 1 The circuit schematic diagram of a low voltage dropout linear regulator in the related art is shown.

[0012] Figure 2 A first principle block diagram of a linear voltage stabilization circuit provided in an embodiment of the present application is shown.

[0013] Figure 3 Shows the functional block diagram of the channel selection module.

[0014] Figure 4 A circuit schematic diagram of a first channel selection unit is shown.

[0015] Figure 5 A circuit diagram of the first switch is shown.

[0016] Figure 6 A circuit schematic diagram of a second channel selection unit is shown.

[0017] Figure 7 A circuit diagram of the second switch is shown.

[0018] Figure 8 A second principle block diagram of the linear voltage stabilization circuit provided in an embodiment of the present application is shown.

[0019] Fig. 9 A functional block diagram of a substrate switching module is shown.

[0020] Fig.10 A circuit schematic diagram of the first substrate switching unit is shown.

[0021] Fig.11 A circuit diagram of the third switch is shown.

[0022] Fig.12 A circuit schematic diagram of the second substrate switching unit is shown.

[0023] Fig.13 A circuit diagram of a fourth switch is shown.

[0024] Fig.14 A third principle block diagram of the linear voltage stabilization circuit provided in an embodiment of the present application is shown.

[0025] Fig.15Shows the functional block diagram of the logic control module.

[0026] Fig.16 A fourth principle block diagram of the linear voltage stabilization circuit provided in an embodiment of the present application is shown.

[0027] Fig.17 Shows the functional block diagram of the power management module.

[0028] Fig.18 A circuit schematic diagram of a linear voltage stabilization circuit provided in an embodiment of the present application is shown.

[0029] Fig.19 A schematic diagram of a chip provided in an embodiment of the present application is shown.

[0030] Fig. 20 A schematic diagram of an electronic device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0031] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0032] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0033] In the embodiments of the present application, it should be noted that, in this article, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0034] Moreover, the terms "comprises," "comprising," or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0035] In the description of the embodiments of the present application, words such as "example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "example" or "for example" in the embodiments of the present application is not to be interpreted as being more preferred or having more advantages than another embodiment or design. The use of words such as "example" or "for example" is intended to present relative concepts in a clear manner.

[0036] In addition, the "plurality" in the embodiments of the present application refers to two or more than two. In view of this, in the embodiments of the present application, "plurality" can also be understood as "at least two". "At least one" can be understood as one or more, for example, one, two or more. For example, including at least one means including one, two or more, and there is no limit on which ones are included. For example, including at least one of A, B and C, then A, B, C, A and B, A and C, B and C, or A, B and C can be included.

[0037] It should be noted that in the embodiments of the present application, "connection" can be understood as electrical connection, and the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components.

[0038] The first pole / first end of each transistor used in the embodiments of the present application is one of the source and the drain, and the second pole / second end of each transistor is the other of the source and the drain. Since the source and drain of the transistor can be symmetrical in structure, the source and drain thereof can be structurally indistinguishable, that is, the first pole / first end and the second pole / second end of the transistor in the embodiments of the present application can be structurally indistinguishable. Exemplarily, in the case where the transistor is a P-type transistor, the first pole / first end of the transistor is the source, and the second pole / second end is the drain; exemplarily, in the case where the transistor is an N-type transistor, the first pole / first end of the transistor is the drain, and the second pole / second end is the source.

[0039] Figure 1 The circuit schematic diagram of the low dropout linear regulator (LDO) shown is a typical circuit schematic diagram, which includes an error amplifier EA, a power tube MP, a first resistor R1, a second resistor R2, a third resistor RESR, a fourth resistor RL and a first capacitor CL, wherein VDD is a power supply voltage.

[0040] When the output voltage VOUT changes, the resistor feedback network composed of the first resistor R1 and the second resistor R2 samples the output voltage VOUT to obtain a feedback voltage VFB that is proportional to the output voltage. The feedback voltage VFB is compared with the reference voltage VREF generated by the bandgap reference voltage source. The error amplifier EA amplifies the difference and controls the gate voltage of the power tube MP, thereby stabilizing the output voltage VOUT.

[0041] Specifically, when the output voltage VOUT suddenly increases, after the resistor voltage is divided by the resistor feedback network, a feedback voltage VFB that is increased relative to the original voltage is obtained, while the reference voltage VREF of the bandgap reference voltage source remains unchanged, causing the gate voltage of the power tube MP to increase, thereby reducing the output voltage VOUT, forming a negative feedback loop, thereby obtaining a stable output voltage VOUT.

[0042] On the contrary, when the output voltage VOUT suddenly decreases, the gate voltage of the power tube MP decreases, thereby increasing the output voltage VOUT, forming a negative feedback loop, thereby obtaining a stable output voltage VOUT.

[0043] From the above analysis, it can be seen that most linear regulators use a single power supply voltage input channel, which cannot meet the application requirements of multi-channel high power supply voltage channels.

[0044] like Figure 2 As shown, an embodiment of the present application provides a linear voltage stabilizing circuit 100, which includes a first channel module 10, a second channel module 20 and a channel selection module 30. The first channel module 10 and the second channel module 20 can support a first power supply voltage VBUS1 and a second power supply voltage VBUS2 of a multi-channel input. The channel selection module 30 controls the first channel module 10 and the second channel module 20, and can select a higher voltage of the first power supply voltage VBUS1 and the second power supply voltage VBUS2 as the target power supply voltage, thereby realizing the selection of an output higher voltage in a multi-channel high power supply voltage, which is conducive to the application in a multi-channel high voltage environment such as a high-voltage PD (Power Delivery) fast charging chip and automotive industrial electronics.

[0045] The present application embodiment provides a linear voltage stabilization circuit 100. Figures 2 to 18 ,like Figure 2As shown, the linear voltage regulator circuit 100 includes a first channel module 10, a second channel module 20 and a channel selection module 30. The first channel module 10 is used to receive a first power supply voltage VBUS1; the second channel module 20 is used to receive a second power supply voltage VBUS2; the channel selection module 30 is used to control the first channel module 10 and the second channel module 20 to use the higher voltage of the first power supply voltage VBUS1 and the second power supply voltage VBUS2 as the target power supply voltage.

[0046] It can be understood that the linear voltage regulator circuit 100 provided in the embodiment of the present application can support the first power supply voltage VBUS1 and the second power supply voltage VBUS2 of multi-channel input through the first channel module 10 and the second channel module 20. The channel selection module 30 controls the first channel module 10 and the second channel module 20, and can select the higher voltage of the first power supply voltage VBUS1 and the second power supply voltage VBUS2 as the target power supply voltage, thereby realizing the selection of the output of a higher voltage in the multi-channel high power supply voltage, which is conducive to the application in multi-channel high voltage environments such as high-voltage PD (Power Delivery) fast charging chips and automotive industrial electronics.

[0047] Wherein, LDO_OUT is the output voltage of the linear voltage regulator circuit 100 .

[0048] Alternatively, if Figure 3 As shown, the channel selection module 30 includes a first channel selection unit 31 and a second channel selection unit 32 . The first channel selection unit 31 is used to control the first channel module 10 on and off; the second channel selection unit 32 is used to control the second channel module 20 on and off.

[0049] It should be noted that the input end of the first channel selection unit 31 is connected to the input end of the second channel selection unit 32 , the first channel selection unit 31 is connected to the control end of the first channel module 10 , and the output end of the second channel selection unit 32 is connected to the control end of the second channel module 20 .

[0050] In some other embodiments, the first channel selection unit 31 is used to control the first channel module 10 on and off according to the first control signal CMP_OUT and the second control signal CMP_OUTN; the second channel selection unit 32 is used to control the second channel module 20 on and off according to the first control signal CMP_OUT and the second control signal CMP_OUTN.

[0051] In some other embodiments, such as Figure 4As shown, the first channel selection unit 31 may include a first switch tube K1, and the first switch tube K1 may be exemplarily a first transistor M1 or a second transistor M2, which can reduce the number of transistors used in the first channel selection unit 31 and reduce the occupied area.

[0052] Alternatively, if Figure 5 As shown, the first switch tube K1 includes a first transistor M1 and a second transistor M2, the first electrode of the first transistor M1 is used to access the differential amplification signal, the second electrode of the first transistor M1 is connected to the control end of the first channel module 10, and the control electrode of the first transistor M1 is used to access the first control signal CMP_OUT; the first electrode of the second transistor M2 is connected to the second electrode of the first transistor M1, the second electrode of the second transistor M2 is connected to the first electrode of the first transistor M1, and the control electrode of the second transistor M2 is used to access the second control signal CMP_OUTN.

[0053] It should be noted that when the first power supply voltage VBUS1 is higher than the second power supply voltage VBUS2, the first control signal CMP_OUT is at a high potential, the second control signal CMP_OUTN is at a low potential, the first transistor M1 and the second transistor M2 are both turned on to control the first channel module 10 to turn on, and the output first power supply voltage VBUS1 is LDO_OUT.

[0054] In some other embodiments, such as Figure 6 As shown, the second channel selection unit 32 may include a second switch tube K2, and the second switch tube K2 may be a third transistor M3 or a fourth transistor M4, which can reduce the number of transistors used in the second channel selection unit 32 and reduce the occupied area.

[0055] It should be noted that, when the first switch tube K1 is the first transistor M1, the second switch tube K2 is the fourth transistor M4. Alternatively, when the first switch tube K1 is the second transistor M2, the second switch tube K2 may be the third transistor M3.

[0056] Alternatively, if Figure 7 As shown, the second switch tube K2 includes a third transistor M3 and a fourth transistor M4, the first electrode of the third transistor M3 is connected to the first electrode of the first transistor M1, the second electrode of the third transistor M3 is connected to the control end of the second channel module 20, and the control electrode of the third transistor M3 is connected to the control electrode of the second transistor M2; the first electrode of the fourth transistor M4 is connected to the second electrode of the third transistor M3, the second electrode of the fourth transistor M4 is connected to the first electrode of the third transistor M3, and the control electrode of the fourth transistor M4 is connected to the control electrode of the first transistor M1.

[0057] It should be noted that, when the first power supply voltage VBUS1 is higher than the second power supply voltage VBUS2, the first control signal CMP_OUT is at a high potential, the second control signal CMP_OUTN is at a low potential, the third transistor M3 and the fourth transistor M4 are both disconnected to control the second channel module 20 to be disconnected, so that the first power supply voltage VBUS1 can be output as LDO_OUT through the first channel module 10.

[0058] Alternatively, if Figure 8 As shown, the first channel module 10 includes a fifth transistor M5, a first electrode of the fifth transistor M5 is used to access the first power supply voltage VBUS1, and a control electrode of the fifth transistor M5 is connected to the second electrode of the first transistor M1 and the first electrode of the second transistor M2. The second channel module 20 includes a sixth transistor M6, a first electrode of the sixth transistor M6 is used to access the second power supply voltage VBUS2, a control electrode of the sixth transistor M6 is connected to the second electrode of the third transistor M3 and the first electrode of the fourth transistor M4, and a second electrode of the sixth transistor M6 is connected to the second electrode of the fifth transistor M5 and outputs an output voltage.

[0059] It should be noted that the channel type of the fifth transistor M5 is the same as the channel type of the sixth transistor M6, for example, both may be N-channel field effect transistors or bipolar junction transistors, specifically, both may be lateral diffused metal oxide semiconductor transistors (LDMOS).

[0060] In some embodiments, such as Figure 8 As shown, the linear voltage regulator circuit 100 also includes a voltage feedback module 40, a differential amplifier module 50 and a substrate switching module 60. The voltage feedback module 40 is used to output a corresponding feedback voltage according to LDO_OUT; the differential amplifier module 50 is used to output a differential amplification signal according to the differential amplification result of the reference voltage VREF and the feedback voltage; the substrate switching module 60 is used to switch the substrate voltage of the fifth transistor M5 and the substrate voltage of the sixth transistor M6 to prevent LDO_OUT from backflowing to the first power supply voltage VBUS1 or the second power supply voltage VBUS2.

[0061] It should be noted that the substrate voltage can be selected as the potential of the ground terminal GND or the source potential of the corresponding transistor to prevent leakage when the transistor is turned off.

[0062] Alternatively, if Fig. 9As shown, the voltage feedback module 40 includes a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected to the second electrode of the fifth transistor M5 and the second electrode of the sixth transistor M6; one end of the second resistor R2 is connected to the other end of the first resistor R1, and the other end of the second resistor R2 is connected to the ground terminal GND. The differential amplifier module 50 includes an error amplifier EA, a first input end of the error amplifier EA is connected to the feedback voltage, a second input end of the error amplifier EA is connected to the reference voltage VREF, and an output end of the error amplifier EA outputs a differential amplification signal.

[0063] In some embodiments, such as Fig. 9 As shown, the substrate switching module 60 includes a first substrate switching unit 61 and a second substrate switching unit 62. The first substrate switching unit 61 is used to prevent LDO_OUT from flowing back to the first electrode of the fifth transistor M5 when the fifth transistor M5 is disconnected; the second substrate switching unit 62 is used to prevent LDO_OUT from flowing back to the first electrode of the sixth transistor M6 when the sixth transistor M6 is disconnected.

[0064] It should be noted that the fifth transistor M5 and the sixth transistor M6 are turned on in time-sharing mode, i.e., they are turned on asynchronously. Therefore, due to the different switching states of the fifth transistor M5 and the sixth transistor M6, the changes in the substrate voltages of the two transistors are also correspondingly different, so as to prevent LDO_OUT from backflowing to the first electrode of the fifth transistor M5 or the first electrode of the sixth transistor M6 in time-sharing mode.

[0065] Alternatively, if Fig.10 As shown, the first substrate switching unit 61 includes a seventh transistor M7 and a third switch tube K3, the first electrode of the seventh transistor M7 is connected to the ground terminal GND, the second electrode of the seventh transistor M7 is connected to the substrate of the fifth transistor M5, and the control electrode of the seventh transistor M7 is used to access the second control signal CMP_OUTN; the first end of the third switch tube K3 is connected to the second electrode of the fifth transistor M5, and the second end of the third switch tube K3 is connected to the second electrode of the seventh transistor M7.

[0066] Alternatively, if Fig.11 As shown, the third switch tube K3 includes an eighth transistor M8 and a ninth transistor M9, the first electrode of the eighth transistor M8 is connected to the second electrode of the fifth transistor M5, the second electrode of the eighth transistor M8 is connected to the second electrode of the seventh transistor M7, and the control electrode of the eighth transistor M8 is used to access the first control signal CMP_OUT; the first electrode of the ninth transistor M9 is connected to the second electrode of the eighth transistor M8, the second electrode of the ninth transistor M9 is connected to the first electrode of the eighth transistor M8, and the control electrode of the ninth transistor M9 is used to access the second control signal CMP_OUTN.

[0067] It should be noted that the first control signal CMP_OUT is at a high potential, the second control signal CMP_OUTN is at a low potential, the fifth transistor M5 is in an on state, the seventh transistor M7 is in an off state, the eighth transistor M8 and the ninth transistor M9 are both in an on state, and at this time, the substrate of the fifth transistor M5 is connected to the second electrode, i.e., the source, of the fifth transistor M5.

[0068] The first control signal CMP_OUT is at a low potential, the second control signal CMP_OUTN is at a high potential, the fifth transistor M5 is in a disconnected state, the seventh transistor M7 is in a turned-on state, the eighth transistor M8 and the ninth transistor M9 are both in a disconnected state, and the substrate of the fifth transistor M5 is connected to the ground terminal GND.

[0069] In some other embodiments, the third switch tube K3 is used to replace the eighth transistor M8 and the ninth transistor M9, which can save area.

[0070] Alternatively, if Fig.12 As shown, the second substrate switching unit 62 includes a tenth transistor M10 and a fourth switch tube K4, the first electrode of the tenth transistor M10 is connected to the ground terminal GND, the second electrode of the tenth transistor M10 is connected to the substrate of the sixth transistor M6, and the control electrode of the tenth transistor M10 is used to access the first control signal CMP_OUT; the first end of the fourth switch tube K4 is connected to the second electrode of the sixth transistor M6, and the second end of the fourth switch tube K4 is connected to the second electrode of the tenth transistor M10.

[0071] Alternatively, if Fig.13 As shown, the fourth switch tube K4 includes an eleventh transistor M11 and a twelfth transistor M12, the first electrode of the eleventh transistor M11 is connected to the second electrode of the sixth transistor M6, the second electrode of the eleventh transistor M11 is connected to the second electrode of the tenth transistor M10, and the control electrode of the eleventh transistor M11 is used to access the second control signal CMP_OUTN; the first electrode of the twelfth transistor M12 is connected to the second electrode of the eleventh transistor M11, the second electrode of the twelfth transistor M12 is connected to the first electrode of the eleventh transistor M11, and the control electrode of the twelfth transistor M12 is used to access the first control signal CMP_OUT.

[0072] It should be noted that the first control signal CMP_OUT is at a high potential, the second control signal CMP_OUTN is at a low potential, the sixth transistor M6 is in a disconnected state, the tenth transistor M10 is in a turned-on state, the eleventh transistor M11 and the twelfth transistor M12 are both in a disconnected state, and the substrate of the sixth transistor M6 is connected to the ground terminal GND.

[0073] The first control signal CMP_OUT is at a low potential, the second control signal CMP_OUTN is at a high potential, the sixth transistor M6 is in an on state, the tenth transistor M10 is in an off state, the eleventh transistor M11 and the twelfth transistor M12 are both in an on state, and at this time, the substrate of the sixth transistor M6 is connected to the second electrode, i.e., the source, of the sixth transistor M6.

[0074] In some other embodiments, the fourth switch tube K4 is used to replace the eleventh transistor M11 and the twelfth transistor M12, which can save area.

[0075] Alternatively, if Fig.14 As shown, the linear voltage regulator circuit 100 further includes a logic control module 70, and the logic control module 70 is used to generate a first control signal CMP_OUT and a second control signal CMP_OUTN based on a comparison result between the first power supply voltage VBUS1 and the second power supply voltage VBUS2.

[0076] It should be noted that the logic control module 70 is used to generate a first control signal CMP_OUT based on a comparison result between the first power voltage VBUS1 and the second power voltage VBUS2 , and then generate a corresponding second control signal CMP_OUTN based on the first control signal CMP_OUT.

[0077] Alternatively, if Fig.15 As shown, the logic control module 70 includes a comparator 71 and an inverter INV. The comparator 71 is used to generate a first control signal CMP_OUT according to a comparison result between the first power supply voltage VBUS1 and the second power supply voltage VBUS2; the inverter INV is used to generate a second control signal CMP_OUTN which is inverted from the first control signal CMP_OUT according to the first control signal CMP_OUT.

[0078] It should be noted that the output end of the comparator 71 is used to output the first control signal CMP_OUT. The output end of the inverter INV is used to output the second control signal CMP_OUTN. The output end of the comparator 71 is connected to the input end of the inverter INV to receive the first control signal CMP_OUT.

[0079] Alternatively, if Fig.16As shown, the linear voltage regulator circuit 100 also includes a soft start module 80 and a power management module 90. The soft start module 80 is used to generate a reference voltage VREF according to the bias voltage VBG with a delay to prevent a large instantaneous current from flowing through the first channel module 10 or the second channel module 20 when the circuit is instantly enabled. The power management module 90 is used to output a lower potential power supply after the first power supply voltage VBUS1 and the second power supply voltage VBUS2 are processed to power the soft start module 80, the comparator 71 and the error amplifier EA. Among them, the error amplifier EA also needs to be connected to the ground terminal GND (analog ground).

[0080] It should be noted that VCP_OUT is the supply voltage output by the power management module 90 .

[0081] Alternatively, if Fig.17 As shown, the power management module 90 includes a voltage selection unit 91, a low-dropout linear regulator 92 and a charge pump 93. The voltage selection unit 91 is used to select and output the higher voltage of the first power supply voltage VBUS1 and the second power supply voltage VBUS2; the low-dropout linear regulator 92 is used to stabilize the higher voltage of the first power supply voltage VBUS1 and the second power supply voltage VBUS2; the charge pump 93 is used to boost the higher voltage of the first power supply voltage VBUS1 and the second power supply voltage VBUS2 after voltage processing.

[0082] It should be noted that the voltage selection unit 91, the low-dropout linear regulator 92 and the charge pump 93 are connected in sequence to select the higher voltage from the first power supply voltage VBUS1 and the second power supply voltage VBUS2, and supply power after voltage stabilization and voltage doubling.

[0083] Alternatively, if Fig.18 As shown, the linear voltage regulator circuit 100 also includes a first Zener diode ZD1 and a second Zener diode ZD2, wherein the cathode of the first Zener diode ZD1 is connected to the control electrode of the fifth transistor M5, and the anode of the first Zener diode ZD1 is connected to the ground terminal GND to clamp the control electrode potential of the fifth transistor M5. The cathode of the second Zener diode ZD2 is connected to the control electrode of the sixth transistor M6, and the anode of the second Zener diode ZD2 is connected to the ground terminal GND to clamp the control electrode potential of the sixth transistor M6. In this way, the control electrode potential can be prevented from exceeding the withstand voltage requirement of the tube, and the fifth transistor M5 and the sixth transistor M6, which are power tubes, can be prevented from burning out.

[0084] The low voltage dropout linear regulator 92 can also be connected to the corresponding reference voltage VREF and reference current as needed. VAUX_3V is the output voltage of the low voltage dropout linear regulator 92, which can be 3V by way of example. IREF_cp is the current signal connected to the charge pump 93. Ibias is the bias current connected to the soft start module 80.

[0085] In summary, the specific working principle of the above-mentioned linear voltage regulator circuit 100 is: the first power supply voltage VBUS1 and the second power supply voltage VBUS2, which are two high-voltage inputs, are compared, and the higher voltage output is selected as VBUS, and used as the input power supply of the low-voltage difference linear regulator 92 (auxiliary LDO). VBUS converts the input high-voltage power supply to a lower voltage output as VAUX_3V through the auxiliary LDO, and VAUX_3V is then pumped to about 2VAUX_3V through the charge pump 93 to provide power to the soft start module 80, the error amplifier EA, and the comparator 71. In this way, the use of high-voltage LDMOS tubes is greatly reduced, and the chip area is reduced.

[0086] It is worth noting that when the power is initially turned on, the external capacitor ( Figure 1 The charge on CL in is 0. If the reference voltage VREF has been established at this time, the error amplifier EA is equivalent to a comparator, which causes the gate voltage of the fifth transistor M5 or the sixth transistor M6 to be pulled up, and a large current flows through the fifth transistor M5 or the sixth transistor M6 instantly. The addition of the soft start circuit effectively improves this phenomenon.

[0087] Among them, the magnitudes of the first power supply voltage VBUS1, the second power supply voltage VBUS2, and VAUX_3V can be determined according to the specific project and its working scenario.

[0088] The input first power supply voltage VBUS1 and the second power supply voltage VBUS2 have multiple states in practical applications, as follows:

[0089] (1) The first power supply voltage VBUS1 is powered, and the second power supply voltage VBUS2 is not powered (floating).

[0090] (2) The first power supply voltage VBUS1 is not powered (floating), and the second power supply voltage VBUS2 is powered.

[0091] (3) The first power voltage VBUS1 is higher than the second power voltage VBUS2.

[0092] (4) The first power supply voltage VBUS1 is lower than the second power supply voltage VBUS2.

[0093] (5) The first power supply voltage VBUS1 is equal to the second power supply voltage VBUS2.

[0094] (6) The first power supply voltage VBUS1 is powered, and the second power supply voltage VBUS2 is grounded.

[0095] (7) The first power supply voltage VBUS1 is grounded, and the second power supply voltage VBUS2 is powered.

[0096] For the above-mentioned various power supply states, the correct channel needs to be selected in the design. When the voltage input range of the first power supply voltage VBUS1 / the second power supply voltage VBUS2 is relatively large, a simple high-voltage Schottky diode solution is used to select the maximum voltage. Since the diode itself has a certain voltage drop, the overall circuit cannot achieve correct operation at a lower input voltage. Therefore, the present invention adopts a comparator 71 with a relatively high-precision rail-to-rail input to achieve the selection of two channels.

[0097] Therefore, the working status is as follows:

[0098] (1) The first power supply voltage VBUS1 is powered, and the second power supply voltage VBUS2 is not powered (suspended), the first channel module 10 is turned on, and the second channel module 20 is turned off.

[0099] (2) The first power supply voltage VBUS1 is powered off (floating), and the second power supply voltage VBUS2 is powered on. The first channel module 10 is disconnected, and the second channel module 20 is turned on.

[0100] (3) The first power supply voltage VBUS1 is higher than the second power supply voltage VBUS2 , the first channel module 10 is turned on, and the second channel module 20 is turned off.

[0101] (4) The first power supply voltage VBUS1 is lower than the second power supply voltage VBUS2, the first channel module 10 is disconnected, and the second channel module 20 is turned on.

[0102] (5) The first power supply voltage VBUS1 is equal to the second power supply voltage VBUS2, which is determined by the internal hysteresis of the comparator 71. Either the first channel module 10 or the second channel module 20 can be turned on.

[0103] (6) The first power supply voltage VBUS1 is powered, the second power supply voltage VBUS2 is grounded, the first channel module 10 is turned on, and the second channel module 20 is turned off.

[0104] (7) The first power supply voltage VBUS1 is grounded, the second power supply voltage VBUS2 is powered, the first channel module 10 is disconnected, and the second channel module 20 is turned on.

[0105] In principle, the channel module with the higher power supply voltage is turned on to operate, and the selection of the specific channel module is realized by the output control of the comparator 71 .

[0106] Furthermore, since the outputs of the two channel modules are connected together, when one channel module is turned on and the other channel module is turned off, in order to prevent the power tube of the closed channel module from backflowing, the present invention designs a power tube substrate selection module. The output of the comparator 71 is still used for control. When the channel module is in the open state, the substrate of the power tube of the corresponding channel module is connected to the source (without substrate bias); when the channel module is in the closed state, the substrate of the power tube of the corresponding channel module is grounded, which effectively avoids the leakage backflow phenomenon.

[0107] The present application also provides a chip 200, such as Fig.19 As shown, the chip 200 includes the above-mentioned linear voltage regulator circuit 100. The chip 200 is also called an integrated circuit (IC), and the chip 200 can be, but is not limited to, a SOC (System on Chip) chip or a SIP (system in package) chip.

[0108] It can be understood that since the chip 200 provided in the embodiment of the present application includes the above-mentioned linear voltage regulator circuit 100, it can also support the first power supply voltage VBUS1 and the second power supply voltage VBUS2 of multi-channel input through the first channel module 10 and the second channel module 20. The channel selection module 30 controls the first channel module 10 and the second channel module 20, and can select the higher voltage of the first power supply voltage VBUS1 and the second power supply voltage VBUS2 as the target power supply voltage, thereby achieving the output purpose from multi-channel high power supply voltage to LDO_OUT that can stably carry a load, which is conducive to the application in multi-channel high voltage environments such as high-voltage PD (Power Delivery) fast charging chips and automotive industrial electronics.

[0109] The present application also provides an electronic device, such as Fig. 20As shown, the electronic device 300 includes a device body and the above-mentioned linear voltage regulator circuit 100 or chip 200 arranged in the device body. The electronic device 300 can be, but is not limited to, a weight scale, a body fat scale, a nutrition scale, an infrared electronic thermometer, a pulse oximeter, a human body composition analyzer, a mobile power supply, a wireless charger, a fast charger, a car charger, an adapter, a display, a USB (Universal Serial Bus) docking station, a stylus, a true wireless headset, a car central control screen, a car, a smart wearable device, a mobile terminal, and a smart home device. Smart wearable devices include, but are not limited to, smart watches, smart bracelets, and cervical massagers. Mobile terminals include, but are not limited to, smart phones, laptops, tablet computers, and POS (point of sales terminal). Smart home devices include, but are not limited to, smart sockets, smart rice cookers, smart sweepers, and smart lights.

[0110] It can be understood that since the electronic device 300 provided in the embodiment of the present application includes the above-mentioned linear voltage regulator circuit 100 or chip 200, it can also support the first power supply voltage VBUS1 and the second power supply voltage VBUS2 of multi-channel input through the first channel module 10 and the second channel module 20. The channel selection module 30 controls the first channel module 10 and the second channel module 20, and can output the higher voltage of the first power supply voltage VBUS1 and the second power supply voltage VBUS2 as the target power supply voltage, thereby achieving the output purpose from multi-channel high power supply voltage to LDO_OUT that can stably carry a load, which is conducive to the application in multi-channel high voltage environments such as high-voltage PD (Power Delivery) fast charging chips and automotive industrial electronics.

[0111] The above are only preferred embodiments of the present application, and are not intended to limit the present application in any form. Although the present application has been disclosed as a preferred embodiment as above, it is not intended to limit the present application. Any technical personnel in this field can use the technical contents disclosed above to make some changes or modify them into equivalent embodiments with equivalent changes without departing from the scope of the technical solution of the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A linear voltage stabilizing circuit, characterized in that: The linear voltage stabilization circuit comprises: A first channel module, the first channel module is used to receive a first power supply voltage; A second channel module, the second channel module is used to receive a second power supply voltage; A channel selection module is used to control the first channel module and the second channel module to use the higher voltage of the first power supply voltage and the second power supply voltage as a target power supply voltage.

2. The linear voltage regulator circuit according to claim 1, characterized in that: The channel selection module comprises: A first channel selection unit, the first channel selection unit is used to control the first channel module on and off; The second channel selection unit is used for controlling the second channel module on and off.

3. The linear voltage stabilizing circuit according to claim 2, characterized in that: The first channel selection unit is used to control the first channel module on and off according to the first control signal and the second control signal; The second channel selection unit is used to control the second channel module on and off according to the first control signal and the second control signal.

4. The linear voltage stabilizing circuit according to claim 3, characterized in that: The first channel selection unit comprises: a first transistor, wherein a first electrode of the first transistor is used to access a differential amplification signal, a second electrode of the first transistor is connected to a control end of the first channel module, and a control electrode of the first transistor is used to access the first control signal; A second transistor, wherein a first electrode of the second transistor is connected to a second electrode of the first transistor, a second electrode of the second transistor is connected to a first electrode of the first transistor, and a control electrode of the second transistor is used to access the second control signal.

5. The linear voltage stabilizing circuit according to claim 4, characterized in that: The second channel selection unit includes: a third transistor, wherein a first electrode of the third transistor is connected to the first electrode of the first transistor, a second electrode of the third transistor is connected to the control end of the second channel module, and a control electrode of the third transistor is connected to the control electrode of the second transistor; A fourth transistor, wherein a first electrode of the fourth transistor is connected to a second electrode of the third transistor, a second electrode of the fourth transistor is connected to a first electrode of the third transistor, and a control electrode of the fourth transistor is connected to a control electrode of the first transistor.

6. The linear voltage stabilizing circuit according to claim 5, characterized in that: The first channel module includes a fifth transistor, a first electrode of the fifth transistor is used to access the first power supply voltage, and a control electrode of the fifth transistor is connected to a second electrode of the first transistor and a first electrode of the second transistor; The second channel module includes a sixth transistor, a first electrode of the sixth transistor is used to access the second power supply voltage, a control electrode of the sixth transistor is connected to the second electrode of the third transistor and the first electrode of the fourth transistor, and a second electrode of the sixth transistor is connected to the second electrode of the fifth transistor and outputs the output voltage of the linear voltage regulator circuit; The linear voltage stabilization circuit also includes: A voltage feedback module, the voltage feedback module is used to output a corresponding feedback voltage according to the output voltage; A differential amplification module, the differential amplification module is used to output the differential amplification signal according to the differential amplification result of the reference voltage and the feedback voltage; A substrate switching module, wherein the substrate switching module is used to switch the substrate voltage of the fifth transistor and the substrate voltage of the sixth transistor to prevent the output voltage from flowing back to the first power supply voltage or the second power supply voltage.

7. The linear voltage stabilizing circuit according to claim 6, characterized in that: The voltage feedback module includes a first resistor and a second resistor, one end of the first resistor is connected to the second electrode of the fifth transistor and the second electrode of the sixth transistor; one end of the second resistor is connected to the other end of the first resistor, and the other end of the second resistor is connected to the ground end; The differential amplifier module comprises an error amplifier, a first input terminal of the error amplifier is connected to the feedback voltage, a second input terminal of the error amplifier is connected to the reference voltage, and an output terminal of the error amplifier outputs the differential amplified signal; The substrate switching module comprises: a first substrate switching unit, wherein the first substrate switching unit is used to prevent the output voltage from flowing back to the first electrode of the fifth transistor when the fifth transistor is disconnected; The second substrate switching unit is used for preventing the output voltage from flowing back to the first electrode of the sixth transistor when the sixth transistor is disconnected.

8. The linear voltage regulator circuit according to claim 7, characterized in that: The first substrate switching unit comprises: a seventh transistor, wherein a first electrode of the seventh transistor is connected to the ground terminal, a second electrode of the seventh transistor is connected to the substrate of the fifth transistor, and a control electrode of the seventh transistor is used to access the second control signal; an eighth transistor, wherein a first electrode of the eighth transistor is connected to a second electrode of the fifth transistor, a second electrode of the eighth transistor is connected to a second electrode of the seventh transistor, and a control electrode of the eighth transistor is used to access the first control signal; A ninth transistor, wherein a first electrode of the ninth transistor is connected to a second electrode of the eighth transistor, a second electrode of the ninth transistor is connected to a first electrode of the eighth transistor, and a control electrode of the ninth transistor is used to access the second control signal.

9. The linear voltage stabilizing circuit according to claim 7, characterized in that: The second substrate switching unit comprises: a tenth transistor, wherein a first electrode of the tenth transistor is connected to the ground terminal, a second electrode of the tenth transistor is connected to the substrate of the sixth transistor, and a control electrode of the tenth transistor is used to access the first control signal; an eleventh transistor, a first electrode of the eleventh transistor being connected to the second electrode of the sixth transistor, a second electrode of the eleventh transistor being connected to the second electrode of the tenth transistor, and a control electrode of the eleventh transistor being used for receiving the second control signal; A twelfth transistor, wherein a first electrode of the twelfth transistor is connected to a second electrode of the eleventh transistor, a second electrode of the twelfth transistor is connected to a first electrode of the eleventh transistor, and a control electrode of the twelfth transistor is used to access the first control signal.

10. The linear voltage stabilizing circuit according to any one of claims 1 to 9, characterized in that: The linear voltage regulator circuit further includes a logic control module, and the logic control module is used to generate the first control signal and the second control signal based on a comparison result between the first power supply voltage and the second power supply voltage.

11. The linear voltage stabilizing circuit according to claim 10, characterized in that: The logic control module comprises: a comparator, configured to generate the first control signal according to a comparison result between the first power supply voltage and the second power supply voltage; An inverter is used to generate a second control signal which is inverted from the first control signal according to the first control signal.

12. The linear voltage stabilizing circuit according to claim 11, characterized in that: The linear voltage stabilization circuit also includes: A soft start module, the soft start module is used to generate a reference voltage according to a bias voltage delay to prevent a large instantaneous current from flowing through the first channel module or the second channel module; A power management module is used to output a higher voltage of the first power supply voltage and the second power supply voltage to power the soft start module, the comparator and the error amplifier.

13. The linear voltage stabilizing circuit according to claim 12, characterized in that: The power management module comprises: a voltage selection unit, the voltage selection unit being used to select and output a higher voltage of the first power supply voltage and the second power supply voltage; A low-dropout linear regulator, the low-dropout linear regulator being used to stabilize the higher voltage of the first power supply voltage and the second power supply voltage; A charge pump is used to boost the higher voltage of the first power supply voltage and the second power supply voltage after voltage processing.

14. A chip, characterized in that: The chip includes the linear voltage stabilization circuit according to any one of claims 1 to 13.

15. An electronic device, characterized in that: The electronic device comprises a device body and the chip according to claim 14 disposed in the device body.

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