Voltage stabilizer, power management chip, electric equipment and electric energy equipment

Abstract

The invention provides a voltage stabilizer, a power management chip, electric equipment and electric energy equipment. The voltage stabilizer comprises an external power supply module, a feedback module, a control module and an output module, the external power supply module is connected with the output module and is used for driving the output module through an external power supply when the reference voltage is not established, so that the output voltage of the output module linearly rises along with the voltage of the external power supply; the feedback module is used for switching to closed-loop feedback control after the reference voltage is stable, and adjusting the output voltage according to the reference voltage; and the control module is connected with the external power supply module, the feedback module and the output module, and is used for starting the external power supply module when the reference voltage is not established and switching to the feedback module after the reference voltage is stable. By controlling the driving of the output module in stages, the output module is directly driven by the external power supply module in a power-on reset stage when the reference voltage is not established, and closed-loop feedback control is switched after the reference voltage is stable, so that the sudden change of the output voltage is avoided.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to a voltage regulator, a power management chip, an electrical device, and an electrical energy device. Background Technology

[0002] In electronic systems that require rapid startup and stable power supply, low-dropout linear regulators respond quickly and output a stable voltage during the power-on reset phase, while avoiding voltage spikes or output lag caused by differences in the setup speed of high-voltage or low-voltage power supplies.

[0003] In the prior art, the voltage establishment of a low-dropout linear regulator during the power-on reset phase mainly depends on the stable output of a reference voltage. However, since the reference voltage generation circuit needs a certain amount of time to stabilize, in scenarios where a high-voltage power supply is needed to drive the gate voltage of a MOSFET, the establishment speed of the high-voltage power supply is usually slower than that of the low-voltage power supply. This results in the low-dropout linear regulator being unable to provide driving capability before the high-voltage power supply stabilizes, thus causing the output lag problem. Summary of the Invention

[0004] This application provides a voltage regulator, a power management chip, an electrical device, and a power supply device to achieve the effect of rapid response and output of a stable voltage during the power-on reset phase.

[0005] In a first aspect, embodiments of this application provide a voltage regulator, including: an external power supply module, a feedback module, a control module, and an output module; the external power supply module is connected to the output module and is used to drive the output module through an external power supply when a reference voltage is not established, so that the output voltage of the output module rises linearly with the voltage of the external power supply;

[0006] The feedback module is used to switch to closed-loop feedback control after the reference voltage stabilizes, and adjust the output voltage according to the reference voltage.

[0007] The control module, connected to the external power supply module, feedback module, and output module, is used to enable the external power supply module when the reference voltage is not established and switch to the feedback module after the reference voltage stabilizes.

[0008] In one embodiment, the external power supply module includes: a current mirror unit; a first end of the current mirror unit is connected to an external power supply, and a second end of the current mirror unit is connected to an output module;

[0009] The current mirror unit is used to drive the output module with an externally powered mirror current when the reference voltage is not established, so that the output voltage rises linearly according to the voltage of the external power supply.

[0010] In one embodiment, the current mirror unit includes: a first resistor, a second resistor, a first switch, a second switch, a third switch, and a fourth switch;

[0011] The first terminal of the first switching transistor is connected to an external power supply through a first resistor, the second terminal of the first switching transistor is connected to the third terminal of the second switching transistor, and the third terminal of the first switching transistor is connected to the second resistor.

[0012] The first terminal of the second switch is connected to the first terminal of the third switch and the first terminal of the fourth switch; the second terminal of the second switch is connected to the first power supply; the third terminal of the second switch is connected to the first terminal of the second switch.

[0013] The second terminal of the third switch is connected to an external power supply, and the third terminal of the third switch is connected to the feedback module.

[0014] The second terminal of the fourth switching transistor is connected to an external power supply, and the third terminal of the fourth switching transistor is connected to the output module and the control module.

[0015] In one embodiment, the feedback module includes: a fifth switch, a sixth switch, a seventh switch, an eighth switch, and a ninth switch;

[0016] The first terminal of the fifth switch is connected to the output module to receive the feedback voltage from the output module. The second terminal of the fifth switch is connected to the third terminal of the third switch, and the third terminal of the fifth switch is connected to the second terminal of the seventh switch.

[0017] The first terminal of the sixth switch is used to receive the reference voltage. The second terminal of the sixth switch is connected to the third terminal of the third switch. The third terminal of the sixth switch is connected to the second terminal of the eighth switch and the first terminal of the ninth switch.

[0018] The first terminal of the seventh switch is connected to the first terminal of the eighth switch and the second terminal of the seventh switch.

[0019] The second terminal of the ninth switch is connected to the external power supply module, and the third terminal of the ninth switch is connected to the control module.

[0020] In one embodiment, the control module includes a signal detection unit, which includes a tenth switching transistor;

[0021] The first terminal of the tenth switch is used to detect the status of the reference voltage. The tenth switch is configured to: when the reference voltage is not established, the tenth switch is in the off state and the external power supply module is started; after the reference voltage stabilizes, the tenth switch is in the on state and switches to the feedback module.

[0022] In one embodiment, the external power supply module includes a switching unit; a first end of the switching unit is connected to a first power source, a second end of the switching unit is connected to a second power source, and a third end of the switching unit is connected to an output module.

[0023] The switching unit is configured to: drive the output module through the first power supply when the second power supply is less than the first power supply; and switch the power supply to the second power supply when the second power supply is greater than the first power supply.

[0024] In one embodiment, the voltage regulator further includes an integrated module, which includes a startup reset unit and a bandgap reference unit;

[0025] The startup reset unit is connected to the control module and is used to provide a startup signal; the startup signal is used to characterize the state of the reference voltage.

[0026] The bandgap reference unit is connected to the feedback module to provide a reference voltage.

[0027] In one embodiment, the output module includes an eleventh switch and a voltage detection unit;

[0028] The first terminal of the eleventh switch is connected to the control module, the second terminal of the eleventh switch is connected to the external power supply module, and the third terminal of the eleventh switch is connected to the first terminal of the voltage detection unit; the third terminal of the eleventh switch is used to generate the output voltage.

[0029] The second end of the voltage detection unit is connected to the feedback module to generate a feedback voltage based on the output voltage.

[0030] In one embodiment, the current mirror unit further includes a twelfth switching transistor;

[0031] The first terminal of the twelfth switch is connected to the output module to receive the output voltage. The second terminal of the twelfth switch is connected to the third terminal of the second switch, and the third terminal of the twelfth switch is used to receive the bias current.

[0032] Secondly, embodiments of this application provide a power management chip, including any of the aforementioned voltage regulators.

[0033] Thirdly, embodiments of this application provide an electrical device including the power management chip described above.

[0034] Fourthly, embodiments of this application provide an electrical power device, including the power management chip described above.

[0035] This application provides a voltage regulator, power management chip, electrical device, and power supply device. The voltage regulator includes an external power supply module, a feedback module, a control module, and an output module. The external power supply module is connected to the output module and is used to drive the output module through an external power supply when a reference voltage is not established, so that the output voltage of the output module rises linearly with the voltage of the external power supply. The feedback module is used to switch to closed-loop feedback control after the reference voltage stabilizes, and adjust the output voltage according to the reference voltage. The control module is connected to the external power supply module, the feedback module, and the output module, and is used to enable the external power supply module when the reference voltage is not established, and switch to the feedback module after the reference voltage stabilizes. By controlling the drive of the output module in stages, during the power-on reset stage when the reference voltage is not established, the external power supply module directly drives the output module, so that the output voltage rises linearly with the external power supply. After the reference voltage stabilizes, it switches to closed-loop feedback control, avoiding sudden changes in output voltage and ensuring the stability of output voltage during power-on and power-off processes, thus solving the problem of sudden voltage changes during the reset and power-on stage. Attached Figure Description

[0036] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0037] Figure 1 This is a schematic diagram of the structure of a voltage regulator provided in one embodiment of this application;

[0038] Figure 2 This is a schematic diagram of the structure of an integrated module provided in an embodiment of this application;

[0039] Figure 3 This is a schematic diagram of a voltage regulator provided in another embodiment of this application.

[0040] Figure label:

[0041] 110. External power supply module; 120. Feedback module; 130. Control module; 140. Output module; 111. Switching unit; M1. First switch transistor; M2. Second switch transistor; M3. Third switch transistor; M4. Fourth switch transistor; M5. Fifth switch transistor; M6. Sixth switch transistor; M7. Seventh switch transistor; M8. Eighth switch transistor; M9. Ninth switch transistor; M10. Tenth switch transistor; M11. Eleventh switch transistor; M12. Twelfth switch transistor; R1. First resistor; R2. Second resistor; R3. Third resistor; R4. Fourth resistor.

[0042] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0043] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0044] First, let me explain the terms used in this application:

[0045] POR phase: Power-On Reset, is the transition period from a power-off state to normal operation, ensuring that the equipment can start up safely and reliably.

[0046] The specific application scenario of this application is the voltage stabilization output technology of low dropout linear regulators (LDOs) during the power-on reset (POR) phase. It is mainly used in electronic systems requiring rapid startup and stable power supply. Examples include consumer electronics, industrial control, communication equipment, and automotive electronics. In these scenarios, the LDO, as a core power management module, needs to respond quickly and output a stable voltage during the power-on phase, while avoiding voltage spikes or output lag caused by differences in the establishment speed of high or low voltage power supplies.

[0047] Based on the above scenarios, it can be seen that in existing technologies, the voltage establishment of an LDO during the power-on phase mainly relies on the stable output of a reference voltage (or bandgap reference voltage VREF). However, since the reference voltage generation circuit requires a certain amount of time to stabilize, the LDO circuit suffers from high-voltage power-on delay and voltage surge risk during the POR phase.

[0048] This application provides a voltage regulator that controls the output module in stages. During the power-on reset phase when the reference voltage has not been established, the output module is directly driven by an external power supply module, causing the output voltage to rise linearly with the external power supply. After the reference voltage stabilizes, it switches to closed-loop feedback control to avoid sudden changes in the output voltage and ensure the stability of the output voltage during power-on and reset. This solves the problem of sudden voltage changes during the reset power-on phase.

[0049] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0050] like Figure 1 As shown, Figure 1 This is a schematic diagram of a voltage regulator provided in an embodiment of this application. The voltage regulator includes: an external power supply module 110, a feedback module 120, a control module 130, and an output module 140; the external power supply module 110 is connected to the output module 140 and is used to drive the output module 140 through an external power supply when the reference voltage is not established, so that the output voltage of the output module 140 rises linearly with the voltage of the external power supply; the feedback module 120 is used to switch to closed-loop feedback control after the reference voltage stabilizes, and adjust the output voltage according to the reference voltage; the control module 130 is connected to the external power supply module 110, the feedback module 120, and the output module 140, and is used to enable the external power supply module 110 when the reference voltage is not established, and switch to the feedback module 120 after the reference voltage stabilizes.

[0051] In one embodiment, the output module 140 includes an eleventh switch M11 and a voltage detection unit; the first terminal of the eleventh switch M11 is connected to the control module 130, the second terminal of the eleventh switch M11 is connected to the external power supply module 110, and the third terminal of the eleventh switch M11 is connected to the first terminal of the voltage detection unit; the third terminal of the eleventh switch M11 is used to generate an output voltage; the second terminal of the voltage detection unit is connected to the feedback module 120 and is used to generate a feedback voltage based on the output voltage.

[0052] In one embodiment, the voltage detection unit includes a third resistor R3 and a fourth resistor R4, generating a feedback voltage through resistor voltage division. The output voltage of the output module 140 is... VFB is the feedback voltage.

[0053] Specifically, the LDO drive voltage is divided into two types. The first type is to directly drive the gate of the eleventh switching transistor M11 using an external power supply before the reference voltage is established. The second type is to switch to closed-loop feedback key control after the reference voltage stabilizes, so as to achieve a smooth transition of the output voltage and avoid voltage sudden changes.

[0054] In one embodiment, such as Figure 2 As shown, Figure 2This is a schematic diagram of the structure of an integrated module provided in an embodiment of this application. The voltage regulator also includes an integrated module, which includes a startup reset unit and a bandgap reference unit; the startup reset unit is connected to the control module 130 and is used to provide a startup signal; the startup signal is used to characterize the state of the reference voltage; the bandgap reference unit is connected to the feedback module 120 and is used to provide a reference voltage.

[0055] Specifically, the integrated module integrates a startup reset unit and a bandgap reference unit, using a low-voltage operating structure. The minimum operating voltage of the power supply is 1.2V + Vgs, with VCC and VSS being the positive and negative power supplies for the circuit, respectively. The bandgap reference unit includes resistors T1 and T2, along with associated resistors R5 and R6, forming a reference voltage VREF. The formula for calculating the reference voltage VREF is as follows: Where IPTAT is the current proportional to absolute temperature. POR, VRESET, and VREF are the output signals of the circuit, representing the start signal, reset signal, and reference voltage, respectively. In the start-up unit, Q21 and Q22 form the start-up circuit. After the power supply VCC is powered on, when VCC > 2VGS (assuming Q21 and Q22 have the same Vgs), the gate signal VRESET of Q28 is low, turning off Q28. The start-up circuit begins to work, and Q21, Q22, Q24, and Q27 are all turned on. Before VREF and VRESET stabilize, they generate a voltage division related to VCC based on the ratio of resistors R7 to R9. Q25, Q26, and Q35 are all turned on. At this time, POR is low, Q25 mirrors the current of Q24, and transistors T1 and T2 begin to work, generating VREF. When VCC > VREF + VGS - Q24, VREF is established. Q28 acts as a control element, its gate connected to the reset signal. When VREF and VRESET are established, a high VRESET voltage enables Q28, pulling the gate potential of Q27 to ground and disabling the startup circuit. Q34 and Q35 function as a current comparator, transmitting the VREF voltage establishment status to the gate of Q34 via T1, Q29, Q32, Q34, and Q35. Q34 and Q35 also transmit the current at time T1 during VREF operation as a reference current to the branch of Q35. When VREF is established, the pull-down current of Q34 increases, and the POR signal changes from logic low to logic high. T2, Q29, Q32, R7, R8, and R9 form a negative feedback circuit for the VREF voltage. When the VREF voltage increases (i.e., the base voltage of T2 increases), the collector voltage of T2 decreases. Q29 and Q32 act as source followers in this loop; as the VRESET voltage decreases, the VREF voltage also decreases. In other embodiments, the integrated module may also be other circuit structures, which are not limited herein.

[0056] This application integrates the startup reset unit and the bandgap reference unit to reduce the circuit size. The minimum operating voltage of VCC is VREF+Vgs_Q24≈2V, which is lower than the LDO output voltage of 3.3V. This ensures that the LDO output is generated by VREF negative feedback before VCC exceeds the LDO output voltage, thus ensuring the continuity of the LDO output voltage. Secondly, the LDO can provide output voltage before the power-on reset phase. The integrated module can be directly powered by the output voltage of the LDO in this application without the need for other internal power supplies, while avoiding external power supply noise.

[0057] In one embodiment, such as Figure 1 As shown, the external power supply module 110 includes: a current mirror unit; the first end of the current mirror unit is connected to an external power supply, and the second end of the current mirror unit is connected to the output module 140; the current mirror unit is used to drive the output module 140 through the mirror current of the external power supply when the reference voltage is not established, so that the output voltage rises linearly according to the voltage of the external power supply.

[0058] In one embodiment, please refer to Figure 1 The current mirror unit includes: a first resistor R1, a second resistor R2, a first switch M1, a second switch M2, a third switch M3, and a fourth switch M4. The first terminal of the first switch M1 is connected to an external power supply via the first resistor R1; the second terminal of the first switch M1 is connected to the third terminal of the second switch M2; and the third terminal of the first switch M1 is connected to the second resistor R2. The first terminal of the second switch M2 is connected to the first terminals of the third switch M3 and the fourth switch M4; the second terminal of the second switch M2 is connected to the first power supply; the third terminal of the second switch M2 is connected to the first terminal of the second switch M2; the second terminal of the third switch M3 is connected to an external power supply and to the feedback module 120; the second terminal of the fourth switch M4 is connected to an external power supply and to the output module 140 and the control module 130. The current mirror unit also includes a Zener diode D1, connected as follows: Figure 1 As shown.

[0059] In one embodiment, the feedback module 120 includes: a fifth switch M5, a sixth switch M6, a seventh switch M7, an eighth switch M8, and a ninth switch M9; the first terminal of the fifth switch M5 is connected to the output module for receiving the feedback voltage from the output module 140, the second terminal of the fifth switch M5 is connected to the third terminal of the third switch M3, and the third terminal of the fifth switch M5 is connected to the second terminal of the seventh switch M7; the first terminal of the sixth switch M6 is used to receive the reference voltage, the second terminal of the sixth switch M6 is connected to the third terminal of the third switch M3, the third terminal of the sixth switch M6 is connected to the second terminal of the eighth switch M8 and the first terminal of the ninth switch M9; the first terminal of the seventh switch M7 is connected to the first terminal of the eighth switch M8 and the second terminal of the seventh switch M7; the second terminal of the ninth switch M9 is connected to the external power supply module 110, and the third terminal of the ninth switch M9 is connected to the control module 130.

[0060] In one embodiment, the control module 130 includes a signal detection unit, which includes a tenth switch M10. The first terminal of the tenth switch M10 is used to detect the state of the reference voltage. The tenth switch M10 is configured to: when the reference voltage is not established, the tenth switch M10 is in the off state and the external power supply module 110 is started; after the reference voltage stabilizes, the tenth switch M10 is in the on state and switches to the feedback module 120.

[0061] Specifically, before the reference voltage is established, the start signal, i.e. Figure 1 The POR signal is the first signal; after the reference voltage stabilizes, the start signal is the second signal. In this example, the first signal is low and the second signal is high.

[0062] In one embodiment, the current mirror unit further includes a twelfth switch M12; the first terminal of the twelfth switch M12 is connected to the output module 140 for receiving the output voltage, the second terminal of the twelfth switch M12 is connected to the third terminal of the second switch M2, and the third terminal of the twelfth switch M12 is used to receive the bias current.

[0063] In one embodiment, the first switch M1, the seventh switch M7, the eighth switch M8, the ninth switch M9, the tenth switch M10, the eleventh switch M11, and the twelfth switch M12 are N-type MOS transistors.

[0064] In one embodiment, the second switch M2, the third switch M3, the fourth switch M4, the fifth switch M5, and the sixth switch M6 are P-type MOS transistors.

[0065] Specifically, the feedback module 120 is an operational amplifier (OPA), where the fifth switch M5 and the sixth switch M6 serve as the OPA input pair, the eleventh switch M11 is the driving MOS for the LDO, and IB is the current bias provided by the integrated module (…). Figure 2 The LDO provides a start signal, or POR signal, which is generated after the reference voltage stabilizes. The output voltage controls the on / off state of the twelfth switch M12; VFB is the feedback voltage, connected to the gate of the fifth switch M5, used to adjust the LDO output voltage. The second, third, and fourth switches M2, M3, and M4 are current mirrors, and their width-to-length ratios (W / L) are the same. For example, when the reference voltage VREF = 1.2V and the target LDO output voltage is 3.3V, R2 / R3 = 1.75. The LDO operates in two phases when powered on by an external power supply.

[0066] Phase 1, initial power-on phase, before the reference voltage VREF is established and the power-on reset is complete: external power supply module 110 starts up, first power supply VCC > VTH M1 The first switch M1 is turned on, I M2 =I M1 The fourth switch M4 is turned on and has pull-up capability. Since the reference voltage is not established, the bias current IB = 0, the start signal is low, and the ninth and tenth switches M9 and M10 have no current. At this time, the gate pull-up current of the eleventh switch M11 is... N represents the current mirror ratio. With the pull-down current at 0, the gate voltage is pulled up to near VCC. Therefore, at this time, the output voltage of the eleventh switch M11 = VCC - VGS. M11 .

[0067] In Phase Two, the first power supply VCC continues to increase, the reference voltage VREF stabilizes, and the POR signal goes high. When the VCC voltage is sufficient to stabilize the reference voltage VREF, the POR signal changes from low to high. At this time, the tenth switch M10 turns on, and current flows through the ninth switch M9 and the tenth switch M10. The output voltage VOUT rises with VCC. After VOUT rises to a level that can turn on the bias current switch, the bias current IB is generated to provide the operating current. The feedback module 120 begins to adjust the output voltage according to the reference voltage VREF. When the adjustment is stable, VFB = VREF. .

[0068] This application automatically switches the drive source of the eleventh switching transistor M11 according to the power-on status of the first power supply VCC, so that the output voltage can follow the power-on of VCC in the initial stage of power-on, and automatically switch to the control of the feedback module 120 after POR is completed, so as to provide a continuous output voltage; at the same time, the LDO can supply power to the internal circuit in the initial stage of power-on.

[0069] In one embodiment, such as Figure 3 As shown, Figure 3 This is a schematic diagram of a voltage regulator provided in another embodiment of this application. The external power supply module 110 includes a switching unit 111; the first end of the switching unit 111 is connected to a first power supply, the second end of the switching unit 111 is connected to a second power supply, and the third end of the switching unit 111 is connected to an output module 140; the switching unit 111 is configured to: drive the output module 140 through the first power supply when the second power supply is less than the first power supply; and switch the power supply to the second power supply when the second power supply is greater than the first power supply.

[0070] Specifically, in Figure 1 Based on the previous embodiment, in addition to achieving the output voltage following the external power supply, a power switching function is added. This also avoids the problem of asynchronous internal voltage output caused by different power supply boosting speeds during high-voltage power supply, reducing power-on delay.

[0071] In one embodiment, M2 and M3, M41 and M42, M13 and M14 are current mirror structures, and their MOS has the same width-to-length ratio (W / L).

[0072] In one embodiment, M41, M42, M13, and M14 are P-type MOS transistors, and M43 and M40 are N-type MOS transistors.

[0073] Bias current IB is Figure 2 The integrated module provides the power. The first power supply VCC is a low-voltage power supply, and the second power supply VCH is a high-voltage power supply. With a reference voltage VREF = 1.2V and a target output voltage of 3.3V for the regulator, R3 / R4 = 1.75. When starting the external power supply module, the power switching is divided into two operating stages.

[0074] In Phase 1, when the reference voltage VREF is not established and the start signal is low, the second power supply VCH < the first power supply VCC: the second power supply is a high-voltage power supply, the voltage rises slowly, the bias current IB = 0, the feedback module does not work, and I... M3 =0A. When the second power supply VCH < the first power supply VCC, the fifth switch M5 cannot be turned on. At that time, M8 and M9 are turned on, I M9 =I M8 The gate voltage of the eleventh switching transistor M11 is provided by the first power supply VCC, VG M11 =VCC-2VGS.

[0075] In Phase Two, VCC continues to boost, the reference voltage VREF stabilizes, and the POR signal goes high; the second power supply VCH < the first power supply VCC: when the LDO output voltage is sufficient to start the integrated module and stabilize the reference voltage VREF, the POR signal changes from low to high. At this time, the tenth switch M10 turns on, and the pull-down current provided by the feedback module and the pull-up current provided by VCC jointly control the VG of the eleventh switch M11. M11 The feedback module begins adjusting the output voltage based on the reference voltage feedback, VFB=VREF. .

[0076] Phase 3: Startup and stable output of the bandgap reference circuit, second power supply VCH > first power supply VCC: As the second power supply VCH rises above the first power supply VCC, when VCH - VCC > Vth... M43 Afterwards, M43 is turned off, and the VG pull-up current of the eleventh switch M11 is provided by the second power supply VCH.

[0077] This application achieves pull-up capability by switching the power supply voltage. Before the second power supply VCH is established, the first power supply VCC can provide pull-up capability. After the second power supply VCH is established, the second power supply VCH provides pull-up capability. This ensures that the LDO can output the target voltage in the initial stage of startup. At the same time, after VCH is established, VCH provides pull-up capability to ensure LDO output and improve the gate swing of the driving MOS, thereby increasing the load capacity.

[0078] This application provides a power management chip, including any of the above-described voltage regulators.

[0079] This application provides an electrical device including the power management chip described above.

[0080] This application provides an electrical device including the power management chip described above.

[0081] The division of units is merely a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0082] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0083] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0084] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0085] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0086] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A voltage regulator, characterized in that, include: External power supply module, feedback module, control module, and output module; The external power supply module is connected to the output module and is used to drive the output module through an external power supply when the reference voltage is not established, so that the output voltage of the output module rises linearly with the voltage of the external power supply. The feedback module is used to switch to closed-loop feedback control after the reference voltage stabilizes, and adjust the output voltage according to the reference voltage. The control module is connected to the external power supply module, the feedback module, and the output module, and is used to enable the external power supply module when the reference voltage is not established, and switch to the feedback module after the reference voltage stabilizes.

2. The voltage regulator according to claim 1, characterized in that, The external power supply module includes: a current mirror unit; the first end of the current mirror unit is connected to an external power supply, and the second end of the current mirror unit is connected to the output module; The current mirror unit is used to drive the output module with a mirror current supplied by an external power source when the reference voltage is not established, so that the output voltage rises linearly according to the voltage of the external power source.

3. The voltage regulator according to claim 2, characterized in that, The current mirror unit includes: a first resistor, a second resistor, a first switch, a second switch, a third switch, and a fourth switch; The first terminal of the first switching transistor is connected to the external power supply through the first resistor, the second terminal of the first switching transistor is connected to the third terminal of the second switching transistor, and the third terminal of the first switching transistor is connected to the second resistor. The first end of the second switch is connected to the first end of the third switch and the first end of the fourth switch; the second end of the second switch is connected to the first power supply; the third end of the second switch is connected to the first end of the second switch. The second terminal of the third switch is connected to the external power supply, and the third terminal of the third switch is connected to the feedback module. The second terminal of the fourth switching transistor is connected to the external power supply, and the third terminal of the fourth switching transistor is connected to the output module and the control module.

4. The voltage regulator according to claim 3, characterized in that, The feedback module includes: a fifth switch, a sixth switch, a seventh switch, an eighth switch, and a ninth switch; The first terminal of the fifth switch is connected to the output module to receive the feedback voltage from the output module. The second terminal of the fifth switch is connected to the third terminal of the third switch, and the third terminal of the fifth switch is connected to the second terminal of the seventh switch. The first terminal of the sixth switch is used to receive the reference voltage, the second terminal of the sixth switch is connected to the third terminal of the third switch, and the third terminal of the sixth switch is connected to the second terminal of the eighth switch and the first terminal of the ninth switch. The first end of the seventh switch is connected to the first end of the eighth switch and the second end of the seventh switch; The second terminal of the ninth switch is connected to the external power supply module, and the third terminal of the ninth switch is connected to the control module.

5. The voltage regulator according to claim 1, characterized in that, The control module includes a signal detection unit, and the signal detection unit includes a tenth switching transistor; The first terminal of the tenth switch is used to detect the state of the reference voltage. The tenth switch is configured to: when the reference voltage is not established, the tenth switch is in the off state and the external power supply module is started; after the reference voltage stabilizes, the tenth switch is in the on state and switches to the feedback module.

6. The voltage regulator according to claim 1, characterized in that, The external power supply module includes a switching unit; the first end of the switching unit is connected to a first power source, the second end of the switching unit is connected to a second power source, and the third end of the switching unit is connected to the output module. The switching unit is configured to: drive the output module through the first power supply when the second power supply is less than the first power supply; and switch the power supply to the second power supply when the second power supply is greater than the first power supply.

7. The voltage regulator according to claim 1, characterized in that, The voltage regulator also includes an integrated module, which includes a startup reset unit and a bandgap reference unit; The startup reset unit is connected to the control module and is used to provide a startup signal; the startup signal is used to characterize the state of the reference voltage. The bandgap reference unit is connected to the feedback module and is used to provide the reference voltage.

8. The voltage regulator according to claim 1, characterized in that, The output module includes an eleventh switching transistor and a voltage detection unit; The first terminal of the eleventh switch is connected to the control module, the second terminal of the eleventh switch is connected to the external power supply module, and the third terminal of the eleventh switch is connected to the first terminal of the voltage detection unit; the third terminal of the eleventh switch is used to generate the output voltage. The second end of the voltage detection unit is connected to the feedback module and is used to generate a feedback voltage based on the output voltage.

9. The voltage regulator according to claim 3, characterized in that, The current mirror unit also includes a twelfth switching transistor; The first terminal of the twelfth switch is connected to the output module to receive the output voltage. The second terminal of the twelfth switch is connected to the third terminal of the second switch, and the third terminal of the twelfth switch is used to receive the bias current.

10. A power management chip, characterized in that, Includes the voltage regulator described in any one of claims 1-9 above.

11. An electrical appliance, characterized in that, Includes the power management chip as described in claim 10.

12. An electrical energy device, characterized in that, Includes the power management chip as described in claim 10.

Images