Digital DC-to-DC voltage conversion device and electronic device using same

Abstract

A digital DC-to-DC voltage conversion device is used for converting an input voltage into an output voltage to a digital core circuit and generating an output current to the digital core circuit. According to the digital DC-to-DC voltage conversion device, a switching current unit is used for generating total current to a digital core circuit, and a direct charging path current supply unit is additionally configured. The direct charging path current supply unit comprises a direct charging switch and a direct charging path controller electrically connected with the direct charging switch, the control end of the direct charging switch receives a direct charging switch control signal, and the direct charging path controller generates the direct charging switch control signal to control the direct charging switch to generate direct charging path current to the digital core circuit. Therefore, the digital DC-to-DC voltage conversion device can quickly capture the operation current of the digital core circuit.

Description

Technical Field

[0001] The present invention relates to a digital DC-to-DC voltage conversion technology, and particularly to a digital DC-to-DC voltage conversion device that can more quickly catch up with the operating current of a digital core circuit and an electronic device using the same. Background Art

[0002] A digital DC-to-DC voltage conversion device is a component commonly used in an electronic device having a digital core circuit. It is used to convert an input voltage into an output voltage for the digital core circuit and generate an output current for the digital core circuit as its operating current during operation. Further, the digital DC-to-DC voltage conversion device receives a clock signal and is triggered when the clock signal transitions (e.g., from a low voltage to a high voltage, or from a high voltage to a low voltage), and adjusts the output current supplied to the digital core circuit according to the change in the output voltage, so as to catch up with the operating current of the digital core circuit thereby.

[0003] Please refer to Figure 1 , Figure 1 which is a circuit schematic diagram of a prior art digital DC-to-DC voltage conversion device. The digital DC-to-DC voltage conversion device 1 includes a digital comparator 10, a bidirectional shift register 11, a switched current unit 12, and an output capacitor 14. Among them, the digital comparator 10 is electrically connected to the bidirectional shift register 11, the bidirectional shift register 11 is electrically connected to the switched current unit 12, and the switched current unit 12 is electrically connected to the output capacitor 14. The digital DC-to-DC voltage conversion device 1 is electrically connected to the digital core circuit 13, and the digital core circuit 13 is equivalent to a current sink. The digital core circuit 13 receives the output voltage VOUT converted from the input voltage VIN by the digital DC-to-DC voltage conversion device 1 and receives the output current IOUT as its operating current ILOAD.

[0004] The digital comparator 10 is triggered when the clock signal CLK transitions and is used to compare the output voltage VOUT with the reference voltage VREF and generate a comparison signal CM. The comparison signal CM is received by the bidirectional shift register 11, and the bidirectional shift register 11 generates a plurality of switch control signals according to the comparison signal CM. The switched current unit 12 has a plurality of switches 121. For each switch 121, the control terminal of the switch 121 receives a switch control signal, and both ends of the switch 121 are respectively electrically connected to the input voltage VIN and electrically connected to the digital core circuit 13.

[0005] When the output current IOUT is not sufficient for the digital core circuit 13 to use (i.e., the operating current ILOAD is greater than the output current IOUT), the output voltage VOUT drops, resulting in the reference voltage VREF being greater than the output voltage VOUT. Therefore, the comparison signal CM will be at a low voltage. At this time, the bidirectional shift register 11 will turn on one of the switches 121 that has not been turned on yet, so as to increase the output current IOUT. When the operating current ILOAD is less than the output current IOUT, the output voltage VOUT rises, resulting in the reference voltage VREF being less than the output voltage VOUT. Therefore, the comparison signal CM will be at a high voltage. At this time, the bidirectional shift register 11 will turn off one of the switches 121 that has been turned on, so as to reduce the output current IOUT. The number of switches 121 that are turned on and the number of switches that are turned off will be continuously adjusted until the output voltage VOUT is equal to the reference voltage VREF.

[0006] The multiple switches 121 are implemented by power transistors, such as PMOS transistors, and the switching speed of the multiple switches 121 is limited by the delay of the digital comparator 10. Usually, the delay may be several nanoseconds, but the change in the operating current ILOAD of the digital core circuit 13 may occur within one nanosecond, that is, the change in the operating current ILOAD is as sudden and large as a pulse signal; in other words, the change in the operating current ILOAD of the digital core circuit 13 is much faster than the delay of the digital comparator 10. Thus, the digital DC-DC voltage conversion device 1 cannot quickly catch up with the operating current ILOAD of the digital core circuit 13, that is, the change speed of the output current IOUT cannot keep up with the change speed of the operating current ILOAD. Summary of the Invention

[0007] In view of the problems of the prior art, the present invention aims at a digital DC-DC voltage conversion device and an electronic device using the same that can quickly catch up with the operating current of the digital core circuit. In addition to using a switched-current unit to generate a total current for the digital core circuit, this digital DC-DC voltage conversion device is further configured with a direct-charge path current supply unit to generate a direct-charge path current for the digital core circuit, so as to avoid the drastic change in the operating current of the digital core circuit, resulting in the continuous change of the output voltage of the digital DC-DC voltage conversion device and the inability to quickly return to a stable state.

[0008] Based on at least one object of the present invention, the present invention provides a digital DC-to-DC voltage conversion device. This digital DC-to-DC voltage conversion device is used to convert an input voltage into an output voltage for a digital core circuit and generate an output current for the digital core circuit. This digital DC-to-DC voltage conversion device includes a digital comparator, a bidirectional shift register, a switching current unit, and a direct charging path current supply unit. The digital comparator is used to compare the output voltage with a reference voltage when triggered by a clock signal and output a comparison signal accordingly. The bidirectional shift register is electrically connected to the digital comparator and is used to output a plurality of switch control signals according to the comparison signal when triggered by the clock signal. The switching current unit is electrically connected to the bidirectional shift register and the digital core circuit and includes a plurality of switches. The plurality of first ends of the plurality of switches are electrically connected to the input voltage, the plurality of second ends of the plurality of switches are electrically connected to the digital core circuit, the plurality of control ends of the plurality of switches respectively receive the plurality of switch control signals, and the plurality of switches are used to generate a total current for the digital core circuit. The direct charging path current supply unit is electrically connected to the digital core circuit and the input voltage and includes a direct charging switch and a direct charging path controller electrically connected to the direct charging switch. The first end of the direct charging switch receives the input voltage, the second end of the direct charging switch is electrically connected to the digital core circuit, the control end of the direct charging switch receives a direct charging switch control signal, and the direct charging path controller generates a direct charging switch control signal to control the direct charging switch to generate a direct charging path current for the digital core circuit, where the output current is the sum of the total current and the direct charging path current.

[0009] Based on at least one object of the present invention, the present invention further provides a digital DC-to-DC voltage conversion device. This digital DC-to-DC voltage conversion device is used to convert an input voltage into an output voltage for a digital core circuit and generate an output current for the digital core circuit. This digital DC-to-DC voltage conversion device includes a digital comparator, a total current adjustment signal generator, a total current generation unit, and a direct charging path current supply unit. The digital comparator is used to compare the output voltage with a reference voltage when triggered by a clock signal and output a comparison signal accordingly. The total current adjustment signal generator is electrically connected to the digital comparator and is used to output a total current adjustment signal according to the comparison signal when triggered by the clock signal. The total current generation unit is electrically connected to the total current adjustment signal generator, the input voltage, and the digital core circuit and is used to generate a total current for the digital core circuit according to the total current adjustment signal. The direct charging path current supply unit is electrically connected to the digital core circuit and the input voltage and is used to generate a direct charging path current for the digital core circuit according to the clock signal, where the output current is the sum of the total current and the direct charging path current, and the specific time for the direct charging path current supply unit to supply the direct charging path current is programmable.

[0010] Based on at least one object of the present invention, the present invention further provides an electronic device, which includes any one of the above digital DC-to-DC voltage conversion devices and a digital core circuit.

[0011] In summary, the digital DC-to-DC voltage conversion device provided by the present invention and the electronic device using the same can quickly catch up with the operating current of the digital core circuit, quickly enable the decreasing output voltage to return to the reference voltage, thereby achieving the technical effect of providing a stable output voltage.

[0012] To further understand the technology, means and effects of the present invention, reference may be made to the following detailed description and drawings, so that the objects, features and concepts of the present invention can be thoroughly and specifically understood. However, the following detailed description and drawings are only for reference and illustration of the implementation manner of the present invention, and are not used to limit the present invention. Description of the Drawings

[0013] The provided drawings are used to enable those of ordinary skill in the art to which the present invention pertains to further understand the present invention, and are incorporated into and constitute a part of the specification of the present invention. The drawings show exemplary embodiments of the present invention and are used together with the specification of the present invention to explain the principles of the present invention.

[0014] Figure 1 It is a circuit schematic diagram of a digital DC-to-DC voltage conversion device in the prior art.

[0015] Figure 2 It is a circuit schematic diagram of a digital DC-to-DC voltage conversion device according to an embodiment of the present invention.

[0016] Figure 3 It is a schematic flowchart of a digital DC-to-DC voltage conversion method executed by a digital DC-to-DC voltage conversion device according to an embodiment of the present invention.

[0017] Figure 4 It is a schematic waveform diagram of a comparison signal, a clock signal and a direct charge switch control signal in a digital DC-to-DC voltage conversion device according to an embodiment of the present invention.

[0018] Figure 5 It is a circuit schematic diagram of a digital DC-to-DC voltage conversion device according to another embodiment of the present invention. Detailed Embodiments

[0019] Now, reference will be made in detail to the exemplary embodiments of the present invention, and the exemplary embodiments will be illustrated in the drawings. Wherever possible, the same reference numerals will be used in the drawings and the specification to refer to the same or similar parts. Additionally, the practices of the exemplary embodiments are only one of the implementation manners of the design concept of the present invention, and the following plurality of exemplifications are not used to limit the present invention.

[0020] In order to avoid the technical problems mentioned in the prior art, the present invention provides a digital DC-to-DC voltage conversion device for converting an input voltage into an output voltage for a digital core circuit and generating an output current for the digital core circuit. In addition to using a switched-current unit to generate a total current for the digital core circuit, the digital DC-to-DC voltage conversion device is further configured with a direct-charge path current supply unit. The direct-charge path current supply unit includes a direct-charge switch and a direct-charge path controller electrically connected to the direct-charge switch. The control terminal of the direct-charge switch receives a direct-charge switch control signal, and the direct-charge path controller generates the direct-charge switch control signal to control the direct-charge switch to generate a direct-charge path current for the digital core circuit. Thereby, the digital DC-to-DC voltage conversion device can quickly catch up with the operating current of the digital core circuit.

[0021] First, please refer to Figure 2 , Figure 2 FIG. is a circuit schematic diagram of the digital DC-to-DC voltage conversion device according to an embodiment of the present invention. The digital DC-to-DC voltage conversion device 2 is used to convert an input voltage VIN into an output voltage VOUT for the digital core circuit 23 and generate an output current IOUT for the digital core circuit 23. In this embodiment, the digital DC-to-DC voltage conversion device 2 is a digital low-dropout regulator, but the present invention is not limited thereto.

[0022] The digital core circuit 23 is equivalent to a current sink, and its operating current ILOAD comes from the output current IOUT corresponding to the output voltage VOUT. When the operating current ILOAD increases, if the output current IOUT fails to increase rapidly accordingly, the output voltage VOUT will decrease. The digital DC-to-DC voltage conversion device 2 solves the above technical problem through the setting of the direct-charge path current supply unit 25, and the direct-charge path current supply unit 25 can determine whether to generate a direct-charge path current for the digital core circuit 23 according to the comparison signal CM between the output voltage VOUT and the reference voltage VREF when the clock signal CLK transitions, so that the occurrence of overshooting can also be avoided.

[0023] The digital DC-DC voltage conversion device 2 includes a digital comparator 20, a bidirectional shift register 21, a switched current unit 22, an output capacitor 24, and a direct charging path current supply unit 25. The digital comparator 20 is used to compare the output voltage VOUT with the reference voltage VREF when triggered by a clock signal CLK (for example, edge-triggered, that is, triggered when the clock signal CLK changes from a high voltage to a low voltage or from a low voltage to a high voltage), and accordingly outputs a comparison signal CM. In an embodiment of the present invention, the digital comparator 20 may be a hysteresis digital comparator, but the present invention is not limited thereto. Additionally, in this embodiment, the negative input terminal and the positive input terminal of the digital comparator 20 receive the reference voltage VREF and the output voltage VOUT, respectively.

[0024] The bidirectional shift register 21 is electrically connected to the digital comparator 20 and is used to output a plurality of switch control signals according to the comparison signal CM when triggered by the clock signal CLK. The switched current unit 22 is electrically connected to the bidirectional shift register 21 and the digital core circuit 23, and includes a plurality of switches 221. In this embodiment, the plurality of switches 221 are a plurality of PMOS transistors. The plurality of first ends (source terminals of the PMOS transistors) of the plurality of switches 221 are electrically connected to the input voltage VIN, the plurality of second ends (drain terminals of the PMOS transistors) of the plurality of switches 221 are electrically connected to the digital core circuit 23, the plurality of control ends (gate terminals of the PMOS transistors) of the plurality of switches 221 respectively receive the plurality of switch control signals, and the plurality of switches 221 are controlled by the plurality of switch control signals and are turned on or off, thereby generating a total current to be supplied to the digital core circuit 23.

[0025] Further, the bidirectional shift register 21 outputs after shifting a plurality of bits temporarily stored therein according to the comparison signal CM, and these shifted bits are the above-mentioned plurality of switch control signals. For example, when the output voltage VOUT is less than the reference voltage VREF, the comparison signal CM is at a low voltage, causing the bidirectional shift register 21 to shift left, so as to increase the number of turned-on switches 221 in the switched current unit 22, usually increasing by one at a time, but the present invention is not limited thereto. When the output voltage VOUT is greater than the reference voltage VREF, the comparison signal CM is at a high voltage, causing the bidirectional shift register 21 to shift right, so as to increase the number of turned-off switches 221 in the switched current unit 22, usually increasing by one at a time, but the present invention is not limited thereto.

[0026] The direct charging path current supply unit 25 is electrically connected to the digital core circuit 23 and the input voltage VIN, and includes a direct charging switch 252 and a direct charging path controller 251 electrically connected to the direct charging switch 252. In this embodiment, the direct charging switch 252 is a PMOS transistor, but the present invention is not limited thereto. The first end (source end of the PMOS transistor) of the direct charging switch 252 receives the input voltage VIN, the second end (drain end of the PMOS transistor) of the direct charging switch 252 is electrically connected to the digital core circuit 23, and the control end (gate end of the PMOS transistor) of the direct charging switch 252 receives the direct charging switch control signal VP.

[0027] The direct charging path controller 251 is electrically connected to the digital comparator 20 and is triggered according to the clock signal CLK. When triggered, the direct charging path controller 251 generates a direct charging switch control signal VP according to the comparison signal CM to control the direct charging switch 252 to generate a direct charging path current for the digital core circuit 23, where the output current IOUT is the sum of the total current and the direct charging path current. In addition, the first end and the second end of the output capacitor 24 are electrically connected to the digital core circuit 23 and the ground voltage respectively.

[0028] Further, when the output voltage VOUT is less than the reference voltage VREF, the direct charging switch control signal VP generated by the direct charging path controller 251 changes from a high voltage to a low voltage to turn on the direct charging switch 252, where the specific time when the direct charging switch control signal VP is at a low voltage is programmable. For example, for different manufacturing processes or different usage environments, the user can set the above specific time by himself; the direct charging switch control signal VP is usually a low voltage pulse. In this way, the time when the direct charging switch 252 is turned on is relatively short, and the direct charging path current is a pulse signal, so that the output current IOUT can quickly catch up with the operating current ILOAD. When the output voltage VOUT is not less than the reference voltage VREF, the direct charging switch control signal VP generated by the direct charging path controller 251 maintains a high voltage to turn off the direct charging switch 252 accordingly.

[0029] Briefly speaking, if only the switching current unit 22 is configured, there will be a technical problem that the digital DC-DC voltage conversion device 2 in the prior art cannot quickly catch up with the operating current ILOAD of the digital core circuit 23. Therefore, the key point of this case is that a direct charging path current supply unit 25 is configured, which can provide a direct charging path current when the output voltage VREF becomes smaller, so that the output current IOUT can quickly catch up with the operating current ILOAD, that is, the digital DC-DC voltage conversion device 2 can quickly catch up with the operating current ILOAD of the digital core circuit 23.

[0030] On the other hand, since the durations of the direct charging path current required for different manufacturing processes or different usage environments are different, if the duration of the direct charging path current is insufficient, the digital DC-to-DC voltage conversion device 2 can quickly catch up with the operating current ILOAD of the digital core circuit 23. In order to make the technical solution of this case applicable to different manufacturing processes or different usage environments, in the present invention, the specific time when the direct charging switch control signal VP is at a low voltage is designed to be programmable.

[0031] Incidentally, in order to accelerate the time required for the output current IOUT to catch up with the operating current ILOAD, the direct charging path controller 251 further adjusts the specific time when the direct charging switch control signal VP is at a low voltage according to the comparison signal CM and the previous comparison signal. For example, if in the previous trigger, the output voltage VOUT is less than the reference voltage VREF (the previous comparison signal is at a low voltage), and in this trigger, the output voltage VOUT is also less than the reference voltage VREF (the comparison signal CM is at a low voltage), then the specific time when the direct charging switch control signal VP is at a low voltage can be increased to accelerate the time required for the output current IOUT to catch up with the operating current ILOAD.

[0032] Please refer to Figures 2 to 4 , Figure 3 which is a schematic flowchart of the digital DC-to-DC voltage conversion method executed by the digital DC-to-DC voltage conversion device according to an embodiment of the present invention, and Figure 4 which is a schematic waveform diagram of the comparison signal, clock signal, and direct charging switch control signal in the digital DC-to-DC voltage conversion device according to an embodiment of the present invention. First, in step S30, the digital DC-to-DC voltage conversion device 2 is started. Then, in step S31, the clock signal CLK transitions from a low voltage to a high voltage. In step S32, the direct charging path controller 251 determines whether the comparison signal CM is at a high voltage or a low voltage, that is, determines whether the output voltage VOUT is less than the reference voltage VREF.

[0033] If the output voltage VOUT is less than the reference voltage VREF (i.e., the comparison signal CM is at a low voltage), then step S34 is executed. If the output voltage VOUT is greater than the reference voltage VREF (i.e., the comparison signal CM is at a high voltage), then step S33 is executed. In step S33, the direct charging path controller 251 causes the generated direct charging switch control signal VP to change from a high voltage to a low voltage and maintain a specific time DT before changing to a high voltage, where the specific time DT is programmable. In step S34, the direct charging path controller 251 causes the generated direct charging switch control signal VP to remain at a high voltage. After steps S33 and S34 are completed, it returns to step S31.

[0034] In conjunction with Figure 3 the flowchart of Figure 4As shown, during the first three transitions of the clock signal CLK, the comparison signal CM is at a low voltage. Therefore, the direct charge switch control signal VP changes from a high voltage to a low voltage (to turn on the direct charge switch 252), and after maintaining for a specific time DT, it changes to a high voltage (to turn off the direct charge switch 252). During the fourth transition of the clock signal CLK, the comparison signal CM is at a high voltage, so the direct charge switch control signal VP remains at a high voltage.

[0035] Please refer to Figure 5 , Figure 5 which is a circuit schematic diagram of a digital DC-to-DC voltage conversion device according to another embodiment of the present invention. Different from Figure 2 the embodiment, the direct charge switch 252' of the direct charge path current supply unit 25' of the digital DC-to-DC voltage conversion device 2' is an NMOS transistor. The direct charge path controller 251' makes the direct charge switch control signal VP' generated by the clock signal CLK change from a low voltage to a high voltage, and after maintaining for a period of time DT, it changes to a low voltage. The direct charge path controller 251' does not receive the comparison signal CM. Since the direct charge switch 252' will automatically turn off when the output voltage VOUT rises to the high voltage of the direct charge switch control signal VP', this embodiment can avoid the technical problem of overshoot even if the direct charge path controller 251' does not receive the comparison signal CM.

[0036] On the other hand, in the above two embodiments, a bidirectional shift register and a switched current unit are used to supply the sum current as at least a part of the output current, but the present invention is not limited thereto. In the present invention, the bidirectional shift register and the switched current unit can be replaced by a sum current adjustment signal generator and a sum current generation unit respectively. In addition, the present invention also provides an electronic device, which includes any one of the above digital DC-to-DC voltage conversion devices and a digital core processing circuit, and the type of the digital core processing circuit is not limited thereto.

[0037] In the above embodiment, the direct charge path current supply unit 25 generates the direct charge switch control signal according to the clock signal CLK, but the present invention is not limited thereto. For example, the direct charge path current supply unit 25 can generate the direct charge switch control signal regularly (different from the frequency of the clock signal CLK), or generate the direct charge switch control signal only according to the comparison signal CM.

[0038] In summary, the digital DC-to-DC voltage conversion device provided by the present invention and the electronic device using the same utilize the direct charging path current supply unit to supply the direct charging path current to the digital core circuit. Therefore, it can quickly catch up with the operating current of the digital core circuit and quickly make the decreasing output voltage return to the reference voltage, thereby achieving the technical effect of providing a stable output voltage. In addition, the specific time for the direct charging path current supply unit to supply the direct charging path current is programmable, providing higher adaptability, so that the technical solution of the present invention can be used for digital DC-to-DC voltage conversion devices with different manufacturing processes, temperatures or usage ages. Or, by dynamically adjusting the specific time, the decreasing output voltage can return to the reference voltage more quickly. In addition, in the two embodiments mentioned in the present invention, the technical problem of overshoot is avoided through specific design methods. In one embodiment, the direct charging path current is generated according to the comparison signal when the clock signal transitions, and the direct charging switch uses a PMOS transistor. In the other embodiment, the direct charging path current is generated when the clock signal transitions, and the direct charging switch uses an NMOS transistor.

[0039] It should be understood that the examples and embodiments described herein are for illustrative purposes only, and various modifications or changes thereof will be suggested to those skilled in the art and will be included within the spirit and scope of this application and the scope of the appended claims.

[0040]

Symbol Description

[0041] 1, 2, 2'... digital DC-to-DC voltage conversion device; 10, 20... digital comparator; 11, 21... bidirectional shift register; 12, 22... switch current unit; 121, 221... switch; 13, 23... digital core circuit; 14, 24... output capacitor; 25, 25'... direct charging path current supply unit; 251, 251'... direct charging path controller; 252, 252'... direct charging switch; CLK... clock signal; CM... comparison signal; DT... specific time; ILOAD... operating current; IOUT... output current; S30~S33... step; VIN... input voltage; VOUT... output voltage; VP, VP'... direct charging switch control signal; VREF... reference voltage.

Claims

1. A digital DC-DC voltage conversion device for converting an input voltage into an output voltage for a digital core circuit and generating an output current for the digital core circuit. Characterized in that, A digital comparator for comparing the output voltage with a reference voltage to output a comparison signal when triggered by a clock signal; A bidirectional shift register electrically connected to the digital comparator for outputting a plurality of switch control signals according to the comparison signal when triggered by the clock signal; A switched-current unit electrically connected to the bidirectional shift register and the digital core circuit, including a plurality of switches, wherein a plurality of first ends of the plurality of switches are electrically connected to the input voltage, a plurality of second ends of the plurality of switches are electrically connected to the digital core circuit, a plurality of control ends of the plurality of switches respectively receive the plurality of switch control signals, and the plurality of switches are used to generate a total current for the digital core circuit; And A direct charging path current supply unit electrically connected to the digital core circuit and the input voltage, including a direct charging switch and a direct charging path controller electrically connected to the direct charging switch, wherein a first end of the direct charging switch receives the input voltage, a second end of the direct charging switch is electrically connected to the digital core circuit, a control end of the direct charging switch receives a direct charging switch control signal, and the direct charging path controller generates the direct charging switch control signal to control the direct charging switch to generate a direct charging path current for the digital core circuit, wherein the output current is the sum of the total current and the direct charging path current.

2. The digital DC-DC voltage conversion device according to claim 1, Characterized in that: When the direct charging switch control signal is a first voltage, the direct charging switch is turned off, and when the direct charging switch control signal is a second voltage, the direct charging switch is turned on, and a specific time when the direct charging switch control signal is the second voltage is programmable.

3. The digital DC-DC voltage conversion device according to claim 1, Characterized in that: When the reference voltage is greater than the output voltage, the plurality of switch control signals output by the bidirectional shift register increase the number of turned-on switches of the switched-current unit, and when the reference voltage is less than the output voltage, the plurality of switch control signals output by the bidirectional shift register increase the number of turned-off switches of the switched-current unit.

4. The digital DC-DC voltage conversion device according to claim 1, Characterized in that: The direct charging switch is a PMOS transistor, and the direct charging path current supply unit is further electrically connected to the digital comparator. When the direct charging path controller is triggered by the clock signal and the output voltage is less than the reference voltage, the direct charging switch control signal generated by the direct charging path controller changes from a first voltage to a second voltage to turn on the PMOS transistor for a specific time.

5. The digital DC-DC voltage conversion device according to claim 1, Characterized in that: The direct charging switch is an NMOS transistor. When the direct charging path controller is triggered by the clock signal, the direct charging switch control signal generated by the direct charging path controller changes from a first voltage to a second voltage, so as to turn on the NMOS transistor for a specific time.

6. The digital DC-DC voltage conversion device according to claim 1, characterized in that, further comprising an output capacitor, and a first end and a second end of the output capacitor are electrically connected to the digital core circuit and a ground voltage respectively.

7. The digital DC-DC voltage conversion device according to claim 1, characterized in that: the digital DC-DC voltage conversion device is a digital low-dropout regulator.

8. The digital DC-DC voltage conversion device according to claim 2, characterized in that: the direct charging path controller further adjusts the specific time according to the comparison signal and a previous comparison signal.

9. A digital DC-DC voltage conversion device for converting an input voltage into an output voltage for a digital core circuit and generating an output current for the digital core circuit, characterized in that, comprising: a digital comparator for comparing the output voltage with a reference voltage and outputting a comparison signal accordingly when triggered by a clock signal; a total current adjustment signal generator electrically connected to the digital comparator for outputting a total current adjustment signal according to the comparison signal when triggered by the clock signal; a total current generating unit electrically connected to the total current adjustment signal generator, the input voltage and the digital core circuit for generating a total current for the digital core circuit according to the total current adjustment signal; and a direct charging path current supply unit electrically connected to the digital core circuit and the input voltage for generating a direct charging path current for the digital core circuit, wherein the output current is the sum of the total current and the direct charging path current, and the specific time for which the direct charging path current supply unit supplies the direct charging path current is programmable.

10. An electronic device, characterized in that, the digital DC-DC voltage conversion device according to any one of claims 1 to 9; and the digital core circuit.

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