Power supply module and SoC chip

Abstract

The utility model discloses a power supply module and an SoC chip, and belongs to the field of circuits. The power supply module provided by the utility model comprises a voltage stabilizing diode, a first RC circuit and a first power supply chip, the first power supply chip is provided with an input pin, an enabling pin and an output pin; an input pin of the first power supply chip is connected with the power supply end, an enabling pin of the first power supply chip is connected with the power supply end through the first RC circuit and the voltage stabilizing diode in sequence, and an output pin of the first power supply chip is coupled with the first voltage output end; wherein the positive electrode of the voltage stabilizing diode is connected with the first RC circuit, and the negative electrode of the voltage stabilizing diode is connected with the power supply end.

Description

Technical Field

[0001] This application belongs to the field of circuits, specifically relating to a power supply module and a SoC chip. Background Technology

[0002] Currently, SoC (System on Chip) systems typically require multiple power supplies, most of which include the SoC core voltage V_core (0.8V / 0.9V), I / O (input / output) voltages (1.8V / 3.3V), etc. To ensure the normal operation of the SoC system, there are certain timing requirements for power-on and power-off, and these specific timing requirements can be adjusted according to actual usage needs.

[0003] In related technologies, RC circuits and power supply chips are generally used to provide the required voltage according to a certain power-on and power-off sequence. For example, in actual circuit design, in most scenarios, RC circuits are used to control the voltage of the enable pin of the power supply chip to meet the power-on sequence of the system power supply. However, regarding the power-off sequence of the system power supply, since the difference between the turn-on voltage and the turn-off voltage of the enable pin of the power supply chip is usually large (usually close to 0.6V), the RC circuit, after controlling the power-on sequence of the system power supply, cannot take into account the power-off sequence of the system power supply. The power-off sequence of the system power supply can generally be accomplished by the inherent capabilities of the selected power supply chip (such as the undervoltage lockout threshold of the power supply chip).

[0004] However, in related technologies, relying solely on the power supply chip's own capabilities to achieve the power-down timing of the system suffers from poor reliability. For example, in high-temperature applications, relying solely on the power supply chip's own capabilities for power-down may result in significant errors, potentially leading to incorrect power-down timing. Utility Model Content

[0005] This application provides a power supply module and a SoC chip, which can solve the problem of poor reliability of the power-down timing of system power supply in related technologies.

[0006] In a first aspect, embodiments of this application provide a power supply module, including: a Zener diode, a first RC circuit, and a first power chip;

[0007] The first power chip has an input pin, an enable pin, and an output pin; the input pin of the first power chip is connected to the power supply terminal, the enable pin of the first power chip is connected to the power supply terminal in sequence via the first RC circuit and the Zener diode, and the output pin of the first power chip is coupled to the first voltage output terminal.

[0008] The positive terminal of the Zener diode is connected to the first RC circuit, and the negative terminal of the Zener diode is connected to the power supply terminal.

[0009] Secondly, embodiments of this application provide a SoC chip, including: the power supply module described in the first aspect.

[0010] In this embodiment, the power supply module includes a Zener diode, a first RC circuit, and a first power chip. The first power chip has an input pin, an enable pin, and an output pin. The input pin of the first power chip is connected to the power supply terminal, and the enable pin of the first power chip is connected to the power supply terminal via the first RC circuit and the Zener diode. The output pin of the first power chip is coupled to a first voltage output terminal. The anode of the Zener diode is connected to the first RC circuit, and the cathode of the Zener diode is connected to the power supply terminal. Thus, since there is a fixed voltage difference between the anode and cathode of the Zener diode when it operates in the reverse breakdown region, using the Zener diode in conjunction with the first RC circuit to control the power-on and power-off of the first voltage output terminal reduces the voltage range of the power supply terminal corresponding to the enable pin of the first power chip being turned on and off. Therefore, the Zener diode combined with the first RC circuit can simultaneously control the power-on and power-off timing of the system power supply, solving the problem of poor reliability of the power-off timing in related technologies. Attached Figure Description

[0011] Figure 1 A schematic structural diagram of a power supply module provided in an embodiment of this application;

[0012] Figure 2 A schematic structural diagram of another power supply module provided in the embodiments of this application;

[0013] Figure 3 A schematic structural diagram of another power supply module provided in the embodiments of this application;

[0014] Figure 4 A schematic structural diagram of another power supply module provided in the embodiments of this application;

[0015] Figure 5 A schematic structural diagram of the power supply module in a practical application provided in the embodiments of this application;

[0016] Figure 6 A power-on timing diagram of a power supply module provided in an embodiment of this application;

[0017] Figure 7 A power-down timing diagram of a power supply module provided in an embodiment of this application;

[0018] Figure 8 This is a schematic structural diagram of a SoC chip provided in an embodiment of this application.

[0019] Explanation of reference numerals in the attached figures:

[0020] 10 - Power supply module; 110 - Zener diode; 120 - First RC circuit; 130 - First power chip; 140 - First voltage divider module; 150 - First filter capacitor; 160 - Second filter capacitor; 210 - Second RC circuit; 310 - Third RC circuit; 220 - Second power chip; 320 - Third power chip; 230 - Second voltage divider module; 330 - Third voltage divider module; R9 - First resistor; R10 - Second resistor; R11 - Third resistor; R12 - Fourth resistor; C13 - First capacitor; L1 - First inductor; L2 - Second inductor; L3 - Third inductor; Vcc - Power supply terminal; Vcc1 - First voltage output terminal; Vcc2 - Second voltage output terminal; Vcc3 - Third voltage output terminal; IN - Input pin; EN - Enable pin; LX - Output pin; FB - Feedback pin; P - Positive; N - Negative. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0022] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0023] A problem exists in the reliability of the power-down timing of related technologies. For example, a typical SoC system may include three power supplies: V_core (0.8 / 0.9V), Vcc_1V8 (1.8V), and Vcc_3V3 (3.3V). In a specific example, the power-up timing requirement is V_core first, followed by Vcc_1V8, and finally Vcc_3V3; the power-down timing requirement is Vcc_3V3 first, followed by Vcc_1V8, and finally V_core. Furthermore, during the power-down process, Vcc_1V8 and V_core are only allowed to start powering down when Vcc_3V3 drops to 2.3V or below. Failure to meet the power-up and power-down timing requirements will lead to SoC system malfunctions or abnormalities.

[0024] In existing technologies, the power-on sequence of the system power supply can be achieved by controlling the enable pin of the power supply chip to reach the turn-on voltage (e.g., 1V) using an RC circuit. However, regarding the power-down sequence, the difference between the turn-off voltage (e.g., 0.4V) and the turn-on voltage (e.g., 1V) of the power supply chip (typically close to 0.6V) is significant, making it impossible for the RC circuit to simultaneously handle the power-down sequence. Therefore, generally, the power supply chip's own capabilities (e.g., its undervoltage lockout threshold) are required to complete the power-down sequence.

[0025] For example, regarding the power-down of Vcc_3V3, the undervoltage lockout threshold of the power supply chip is typically 3.4V. That is, when the 5V power supply at the power supply end drops to 3.4V, Vcc_3V3 will power down along with the 5V power supply. However, in abnormal temperature scenarios, when Vcc_3V3 has not yet dropped to 2.3V (for example, to 2.8V), Vcc_1V8 and V_core begin to power down, failing to meet the power-down timing requirements, leading to malfunctions or abnormalities in the SOC system.

[0026] To address the issue of poor reliability in the power-down timing of system power supplies in related technologies, the power supply module provided in this application embodiment can be improved by adding a Zener diode to the RC circuit. Since there is a fixed voltage difference between the positive and negative terminals of the Zener diode when it operates in the reverse breakdown region, using a Zener diode in conjunction with the RC circuit to control the power-on and power-down timing of the system power supply can reduce the voltage range of the power supply terminal corresponding to the enable pin of the power chip being turned on and off. Thus, the Zener diode combined with the first RC circuit can simultaneously control the power-on and power-down timing of the system power supply, solving the problem of poor reliability in the power-down timing of system power supplies in related technologies.

[0027] The power supply module and SoC chip provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0028] Figure 1 This is a schematic structural diagram of a power supply module provided in an embodiment of this application.

[0029] like Figure 1 As shown, the power supply module 10 provided in this application embodiment may include: a Zener diode 110, a first RC circuit 120, and a first power chip 130;

[0030] The first power chip 130 has an input pin IN, an enable pin EN, and an output pin FX. The input pin IN of the first power chip 130 is connected to the power supply terminal Vcc. The enable pin EN of the first power chip 130 is connected to the power supply terminal Vcc in sequence through the first RC circuit 120 and the Zener diode 110. The output pin FX of the first power chip 130 is coupled to the first voltage output terminal Vcc1.

[0031] The Zener diode 110 has a positive terminal N and a negative terminal P. The positive terminal P of the Zener diode 110 is connected to the first RC circuit 120, and the negative terminal N of the Zener diode 110 is connected to the power supply terminal Vcc.

[0032] In this embodiment, a Zener diode 110 and a first RC circuit 120 can be used to control the voltage of the enable pin EN of the first power chip 130, thereby realizing the power-on and power-off timing control of the system power supply.

[0033] It should be noted that in related technologies, the voltage value of the power supply terminal when the enable pin of the first power chip is turned off is determined by the undervoltage lockout threshold (e.g., 3.4V). However, compared to related technologies, in this embodiment, since there is a fixed voltage difference (e.g., 3.3V) between the positive and negative terminals of the Zener diode 110 when it operates in the reverse breakdown region, the voltage value of the power supply terminal Vcc when the enable pin EN of the first power chip is turned off is larger (e.g., 3.74V, larger than 3.4V). This narrows the voltage range of the power supply terminal Vcc when the enable pin EN of the first power chip is turned on and off, allowing the Zener diode 110, combined with the first RC circuit, to simultaneously control the power-on and power-off timing of the system power supply.

[0034] Furthermore, by using a Zener diode 110 and an RC circuit to control the voltage of the enable pin of the first power chip, the Zener diode 110 combined with the first RC circuit can take into account the power-on and power-off timing control of the system power supply, thus solving the problem of poor reliability of the power-off timing of the system power supply in related technologies.

[0035] The power supply module provided according to the embodiments of this application includes a Zener diode, a first RC circuit, and a first power chip. The first power chip has an input pin, an enable pin, and an output pin. The input pin of the first power chip is connected to the power supply terminal, the enable pin of the first power chip is connected to the power supply terminal via the first RC circuit and the Zener diode, and the output pin of the first power chip is coupled to a first voltage output terminal. The anode of the Zener diode is connected to the first RC circuit, and the cathode of the Zener diode is connected to the power supply terminal. Thus, since there is a fixed voltage difference between the anode and cathode of the Zener diode when it operates in the reverse breakdown region, the power-on and power-off control of the first voltage output terminal is achieved by using a Zener diode combined with the first RC circuit. This reduces the voltage range of the power supply terminal corresponding to the enable pin of the first power chip being turned on and off. Consequently, the Zener diode combined with the first RC circuit can simultaneously control the power-on and power-off timing of the system power supply, solving the problem of poor reliability of the power-off timing in related technologies.

[0036] In one specific embodiment, regarding the power-down sequence of the system power supply, when the enable pin EN of the first power chip 130 reaches the shutdown voltage, the negative voltage of the Zener diode 110 is greater than the undervoltage lockout threshold of the first power chip 130.

[0037] For example, if the power supply Vcc is 5V, the enable pin EN of the first power chip 130 has a turn-on voltage of 1V and a turn-off voltage of 0.4V, and the undervoltage lockout threshold of the first power chip 130 is 3.4V. Regarding the power-on sequence of the system power supply, when the 5V power supply rises to 4.4V, the negative terminal voltage of the Zener diode 110 is 4.4V, and the positive terminal voltage is 1.1V. After the 1.1V passes through the first RC circuit 120, the enable pin EN of the first power chip 130 is pulled high to 1V, and the first voltage output terminal Vcc1 begins to power on.

[0038] Regarding the power-down sequence of the system power supply, taking the undervoltage lockout threshold of the first power chip 130 as 3.4V as an example, in related technologies, the first voltage output terminal Vcc1 only starts to power down when the 5V power supply at the power supply terminal Vcc drops to 3.4V. However, in this embodiment, a Zener diode 110 is connected in series with the first RC circuit 120. The Zener diode 110 has a Zener voltage of 3.3V. During the power-down process, when the 5V power supply at the power supply terminal Vcc drops to 3.74V, the negative terminal voltage of the Zener diode 110 is 3.74V, and the negative terminal voltage is 0.44V. After passing through the first RC circuit 120, the 0.44V is pulled low to 0.4V on the enable pin EN of the first power chip 130, and the first voltage output terminal Vcc1 starts to power down.

[0039] It should be noted that in related technologies, the voltage value of the power supply terminal corresponding to the off state of the enable pin of the first power chip is determined by the undervoltage lockout threshold (e.g., 3.4V). However, compared to related technologies, in this embodiment, since there is a fixed voltage difference (e.g., 3.3V) between the positive and negative terminals of the Zener diode 110 when it operates in the reverse breakdown region, the voltage value of the power supply terminal Vcc corresponding to the off state of the enable pin EN of the first power chip 130 is larger (e.g., 3.74V, larger than 3.4V), thus narrowing the voltage range of the power supply terminal Vcc corresponding to the on and off states of the enable pin EN of the first power chip 130.

[0040] Thus, when the enable pin of the first power chip reaches the shutdown voltage (e.g., 0.4V) (corresponding to the power-down timing of the first voltage output terminal), the negative voltage of the Zener diode 110 (e.g., 3.74V) is greater than the undervoltage lockout threshold (e.g., 3.4V) of the first power chip. Compared with the related technology that relies solely on the undervoltage lockout threshold of the power chip to achieve the power-down timing of the system, since the negative voltage of the Zener diode 110 is greater than the undervoltage lockout threshold of the first power chip, the power-down control of the first voltage output terminal Vcc1 can be achieved earlier. This narrows the voltage range of the power supply terminal Vcc corresponding to the enable pin EN of the first power chip 130 being turned on and off, and expands the application range of the power supply module 10.

[0041] In one specific embodiment, in order to control the power-on timing of the first voltage output terminal Vcc1, the first RC circuit 120 may include at least one resistor to perform voltage division and adjust the power-on timing of the first voltage output terminal Vcc1.

[0042] For example, such as Figure 2 As shown, in the power supply module provided in this application embodiment, the first RC circuit 120 may include a first resistor R9 and a second resistor R10, with the first resistor R9 and the second resistor R10 connected in series.

[0043] In this circuit, one end of the first resistor R9 is connected to the positive terminal of the Zener diode 110, and the other end of the first resistor R9 is connected to the enable pin EN of the first power chip 130. One end of the second resistor R10 is connected to the enable pin EN of the first power chip 130, and the other end of the second resistor R10 is grounded.

[0044] For example, if the Zener diode 110 has a Zener voltage of V T The negative terminal voltage of Zener diode 110 is Vcc, and the positive terminal voltage of Zener diode 110 is Vcc-V. T After voltage division by the first resistor R9 and the second resistor R10, the voltage at the enable pin EN of the first power supply chip 130 is (Vcc - V).T )*[R10 / (R9+R10)].

[0045] As the supply voltage Vcc at the power supply terminal continues to rise, the voltage of the enable pin EN of the first power chip 130 (Vcc - V) becomes... T When )*[R10 / (R9+R10)] reaches the turn-on voltage (e.g., 1 volt), the first voltage output terminal Vcc1 starts to power on.

[0046] In this application, no specific restrictions are placed on the specific output voltage value of the first voltage output terminal Vcc1.

[0047] Thus, since the first RC circuit 120 includes a first resistor R9 and a second resistor R10, the voltage of the enable pin EN of the first power chip 130 is controlled to reach the turn-on voltage through the voltage division effect of the first resistor R9 and the second resistor R10, thereby realizing the power-on of the first voltage output terminal Vcc1.

[0048] In order to precisely control the power-on time of the first voltage output terminal Vcc1, the first RC circuit 120 may also include at least one capacitor. By combining the resistor and the capacitor, the charging time of the enable pin EN of the first power chip 130 is adjusted, thereby adjusting the power-on time of the first voltage output terminal Vcc1.

[0049] For example, such as Figure 2 As shown, in the power supply module provided in the embodiments of this application, the first RC circuit 120 may further include a first capacitor C13, which is connected in parallel with the second resistor R10.

[0050] In the first RC circuit 120, attention can be paid to the time constant t of the first RC circuit 120 and the actual charging voltage Vt of the enable pin EN of the first power chip 130. Choosing an appropriate RC combination can avoid timing errors. For example, during power-on, the charging time t = RC for the enable pin EN of the first power chip 130, where R is determined by the first resistor R9 and the second resistor R10, and C is determined by the first capacitor C13. For example, when t = RC, Vt = 0.63Ven, and when t = 3RC, Vt = 0.95Ven, where Ven represents the charging voltage of the enable pin EN of the first power chip 130, and Vt represents the actual voltage of the enable pin EN of the first power chip 130. In practical applications, 3RC is generally used as the charging time t.

[0051] Thus, since the first RC circuit 120 includes a first resistor R9, a second resistor R10, and a first capacitor C13, the combination of resistors and capacitors controls the charging time of the enable pin EN of the first power chip 130 during the power-on process, thereby precisely controlling the power-on time of the first voltage output terminal Vcc1.

[0052] In another specific embodiment, in order to rectify the output voltage of the first voltage output terminal Vcc1, such as Figure 3 As shown, the power supply module 10 may also include a first inductor L1, and the output pin LX of the first power chip 130 is connected to the first voltage output terminal Vcc1 via the first inductor L1.

[0053] Thus, since the output pin LX of the first power chip 130 is connected to the first voltage output terminal Vcc1 via the first inductor L1, the first inductor L1 can smooth the output voltage of the first voltage output terminal Vcc1, reduce current fluctuations, filter noise, and improve the quality of the output voltage of the first voltage output terminal Vcc1.

[0054] In addition, in order to precisely adjust the output voltage value of the first voltage output terminal Vcc1, in a specific embodiment, such as Figure 3 As shown, the power supply module 10 may also include a first voltage divider module 140, and the first power chip 130 may also have a feedback pin FB. The feedback pin FB of the first power chip 130 is connected to the first voltage output terminal Vcc1 via the first voltage divider module 140.

[0055] The first voltage divider module 140 includes a third resistor R11 and a fourth resistor R12, which are connected in series. One end of the third resistor R11 is connected to the first voltage output terminal Vcc1, and the other end of the third resistor R11 is connected to the feedback pin FB of the first power chip 130. One end of the fourth resistor R12 is connected to the feedback pin FB of the first power chip 130, and the other end of the fourth resistor R12 is grounded.

[0056] Among them, the third resistor R11 and the fourth resistor R12 are feedback resistors.

[0057] In this way, this application can precisely adjust the output voltage value of the first voltage output terminal Vcc1 based on the voltage value of the feedback pin FB of the first power chip 130, the resistance value of the third resistor R11 and the resistance value of the fourth resistor R12.

[0058] In one specific embodiment, to further filter out noise in the output voltage of the power supply module, a filter capacitor may also be provided in this embodiment. For example, such as Figure 3 As shown, the power supply module 10 provided in this application embodiment may further include: a first filter capacitor 150 and a second filter capacitor 160. One end of the first filter capacitor 150 is connected to the power supply terminal Vcc, and the other end of the first filter capacitor 150 is grounded. One end of the second filter capacitor 160 is connected to the first voltage output terminal Vcc1, and the other end of the second filter capacitor 160 is grounded.

[0059] Among them, Figure 3 As shown, the first filter capacitor 150 may include at least one capacitor. For example, the first filter capacitor 150 may include two capacitors: capacitor C11 and capacitor C12.

[0060] Among them, Figure 3 As shown, the second filter capacitor 160 may include at least one capacitor, for example, the second filter capacitor 160 may include two capacitors: capacitor C14 and capacitor C15.

[0061] In this way, the present application can filter out noise in the power supply voltage of the power supply terminal through the first filter capacitor 150 and filter out noise in the output voltage of the first voltage output terminal Vcc1 through the second filter capacitor 160.

[0062] In addition, the power supply module can include multiple parallel power supply circuits. Taking a three-way power supply circuit as an example, the power supply module can output different voltage values ​​at the first voltage output terminal, the first voltage output terminal and the first voltage output terminal respectively, and each power supply circuit can be configured to have or not have a Zener diode on the RC circuit.

[0063] For example, in a specific embodiment, such as Figure 4 As shown, the power supply module 10 may also include a second RC circuit 210, a third RC circuit 310, a second power chip 220, a third power chip 320, a second inductor L2, a third inductor L3, a second voltage divider module 230, and a third voltage divider module 330.

[0064] The second power chip 220 has an input pin IN, an enable pin EN, an output pin LX, and a feedback pin FB. The input pin IN of the second power chip 220 is connected to the power supply terminal Vcc. The enable pin EN of the second power chip 220 is connected to the power supply terminal Vcc via the second RC circuit 210. The output pin FX of the second power chip 220 is connected to the second voltage output terminal Vcc2 via the second inductor L2. The feedback pin FB of the second power chip 220 is connected to the second voltage output terminal Vcc2 via the second voltage divider module 230.

[0065] The third power chip 320 has an input pin IN, an enable pin EN, an output pin LX, and a feedback pin FB. The input pin IN of the third power chip 320 is connected to the power supply terminal Vcc. The enable pin EN of the third power chip 320 is connected to the power supply terminal Vcc via the third RC circuit 310. The output pin LX of the third power chip 320 is connected to the third voltage output terminal Vcc3 via the third inductor L3. The feedback pin FB of the third power chip 320 is connected to the third voltage output terminal Vcc3 via the third voltage divider module 330.

[0066] The output voltages of the first voltage output terminal Vcc1, the second voltage output terminal Vcc2, and the third voltage output terminal Vcc3 are all different.

[0067] During the power-on process, the first voltage output terminal Vcc1 is powered on by the first RC circuit 120, the second voltage output terminal Vcc2 is powered on by the second RC circuit 210, and the third voltage output terminal Vcc3 is powered on by the third RC circuit 310.

[0068] It should be noted that the RC parameters of the first RC circuit 120, the second RC circuit 210 and the third RC circuit 310 can all be different, and they can sequentially meet the specific power-on timing requirements of the first voltage output terminal Vcc1, the second voltage output terminal Vcc2 and the third voltage output terminal Vcc3.

[0069] During the power-down process, the power-down timing of the first voltage output terminal Vcc1 can be achieved by the Zener diode 110 combined with the first RC circuit 120, the power-down timing of the second voltage output terminal Vcc2 can be achieved by the capability of the second power chip 220, and the power-down timing of the third voltage output terminal Vcc3 can be achieved by the capability of the third power chip 320.

[0070] In this way, this application can take into account both the power-on and power-off timing of the first voltage output terminal Vcc1 by using the Zener diode 110 in combination with the first RC circuit 120, realize the power-on timing of the second voltage output terminal Vcc2 by using the second RC circuit 210, realize the power-off timing of the second voltage output terminal Vcc2 by using the capability of the second power chip 220, realize the power-on timing of the third voltage output terminal Vcc3 by using the third RC circuit 310, and realize the power-off timing of the third voltage output terminal Vcc3 by using the capability of the third power chip 320.

[0071] For example, with a 5V power supply and a Zener diode 110 providing a 3.3V voltage, the first voltage output terminal outputs 3.3V, the second voltage output terminal outputs 1.8V, and the third voltage output terminal outputs 0.8V or 0.9V. Thus, the power supply module can output 3.3V, 1.8V, and 0.8 / 0.9V respectively from the first voltage output terminals Vcc1, Vcc2, and Vcc3 according to a specific power-on / off sequence to power the SoC system for normal operation.

[0072] In practical applications, such as Figure 5As shown, the power supply module provided in this embodiment includes three parallel circuits to provide power through the following three voltages: V_core (0.8 / 0.9V), Vcc_1V8 (1.8V), and Vcc_3V3 (3.3V). C1, C2, C4, C5, C6, C7, C9, C10, C11, C12, C14, and C15 are decoupling capacitors; R3, R4, R7, R8, R11, and R12 are feedback resistors; and L1, L2, and L3 are inductors, which can be selected according to the actual circuit design.

[0073] Regarding the V_core section, according to the specific timing requirements, since V_core is the earliest to power on and the latest to power off, R2 and C3 can be left unused (using them indicates that the component is being used, while leaving them unused indicates that the component is not being used), and R1 can be fitted with a 10k resistor for current limiting.

[0074] Regarding Vcc_1V8, according to specific timing requirements, Vcc_1V8 should be in the middle during both power-on and power-off. R5 can be a 3k resistor, R6 can be a 1k resistor, and C8 can be left unused.

[0075] Regarding Vcc_3V3, according to the specific timing requirements, Vcc_3V3 should be powered on last, and its power-off time should be earlier than Vcc_1V8 and V_core. For the Zener diode TD1, a 3.3V Zener diode can be selected. For R9, a 1kΩ resistor can be selected. For R10, a 10kΩ resistor can be selected. C13 can be left unused.

[0076] Taking the enable pin EN of three power chips as an example, with an on-state voltage of 1V and an off-state voltage of 0.4V.

[0077] like Figure 6 The following is the power-on sequence for the system power supply:

[0078] When the 5V power supply at the power supply end rises to 2.5V, V_core starts to power on following the 5V power supply input start voltage;

[0079] When the 5V power supply at the power supply end rises to 4V, according to the voltage division of resistors R5 and R6, the enable pin EN of the second power chip corresponding to Vcc_1V8 is pulled high to 1V, and Vcc_1V8 starts to power on.

[0080] When the 5V power supply rises to 4.4V, the negative voltage of the Zener diode is 4.4V and the positive voltage is 1.1V. According to the voltage division of resistors R9 and R10, the enable pin EN of the third power supply chip corresponding to Vcc_3V3 is pulled high to 1V, and Vcc_3V3 starts to power on.

[0081] like Figure 7 As shown, the power-down sequence for the system power supply is as follows:

[0082] When the 5V power supply drops to 3.74V, the negative terminal voltage of the Zener diode is 3.74V, and the positive terminal voltage is 0.44V. Based on the voltage division of resistors R9 and R10, the enable pin EN of the first power supply chip corresponding to Vcc_3V3 is pulled low to 0.4V, initiating power-down.

[0083] Since the undervoltage lockout threshold of the second power supply chip is 3V, when the 5V power supply drops to 3V, Vcc_1V8 will power down along with the 5V power supply.

[0084] Since the undervoltage lockout threshold of the third power supply chip is 2.1V, when the 5V power supply drops to 2.1V, Vcc_core will power down along with the 5V power supply.

[0085] In practical applications, for example, during power-on, the power-on time difference T1 between V_core and Vcc_1V8 is approximately 300µs, and the power-on time difference T2 between V_1V8 and Vcc_3V3 is approximately 350µs. During power-off, the power-off time difference T3 between Vcc_3V3 dropping to 2.3V and Vcc_1V8 is approximately 500µs, and the power-off time difference T4 between Vcc_3V3 dropping to 2.3V and V_core is approximately 600µs.

[0086] The specific circuit parameters of the first, third, and fourth RC circuits can be adjusted according to the actual power-on and power-off requirements (e.g., T1, T2, T3, and T4 are all greater than 0). Various power-on and power-off sequences can be achieved by adjusting the circuit parameters of the RC circuits and the voltage regulation value of the Zener diode. When using RC circuits, attention should be paid to the time constant and the actual charging voltage; choosing an appropriate combination can avoid timing errors. During power-on, the voltage charging time t of the power chip's enable pin EN is RC. For example, when t = RC, Vt = 0.63Ven; when t = 3RC, Vt = 0.95Ven, where Ven represents the charging voltage of the power chip's enable pin EN, and Vt represents the actual voltage of the power chip's enable pin EN. In practical applications, 3RC is generally used as the charging time t.

[0087] In this way, by connecting a Zener diode in series with the RC circuit, the power-on and power-off timing of the system power supply is realized by using the Zener diode in combination with the RC circuit. This narrows the voltage range of the power supply terminal when the enable pin of the power chip is turned on and off. As a result, the Zener diode combined with the RC circuit can take into account the power-on and power-off timing of the system power supply, solving the problem of poor reliability of the power-off timing of the system power supply in related technologies. It realizes that V_core, Vcc_1V8, and Vcc_3V3 are powered on sequentially; Vcc_3V3, Vcc_1V8, and V_core are powered off sequentially, and Vcc_1V8 and V_core start to power off when Vcc_3V3 drops to 2.3V or below during the power-off process.

[0088] Based on the same technical concept as the power supply module provided in the above embodiments, this application also provides a SoC chip, including the power supply module provided in any of the above embodiments.

[0089] Figure 8 This is a schematic diagram of a SoC chip provided in an embodiment of this application.

[0090] like Figure 8 As shown, the SoC chip 800 provided in this application embodiment includes the power supply module 10 provided in any of the above embodiments.

[0091] It should be noted that the SoC chip provided in this application embodiment includes the power supply module provided in any of the above embodiments, and can realize all the functions of the power supply module provided in any of the above embodiments. To avoid repetition, it will not be described again here.

[0092] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0093] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A power supply module, characterized in that, include: Zener diode, first RC circuit and first power supply chip; The first power chip has an input pin, an enable pin, and an output pin; the input pin of the first power chip is connected to the power supply terminal, the enable pin of the first power chip is connected to the power supply terminal in sequence via the first RC circuit and the Zener diode, and the output pin of the first power chip is coupled to the first voltage output terminal. The positive terminal of the Zener diode is connected to the first RC circuit, and the negative terminal of the Zener diode is connected to the power supply terminal.

2. The power supply module according to claim 1, characterized in that, When the enable pin of the first power chip reaches the shutdown voltage, the negative voltage of the Zener diode is greater than the undervoltage lockout threshold of the first power chip.

3. The power supply module according to claim 1, characterized in that, The first RC circuit includes a first resistor and a second resistor, wherein the first resistor and the second resistor are connected in series. In this configuration, one end of the first resistor is connected to the positive terminal of the Zener diode, the other end of the first resistor is connected to the enable pin of the first power chip, one end of the second resistor is connected to the enable pin of the first power chip, and the other end of the second resistor is grounded.

4. The power supply module according to claim 3, characterized in that, The first RC circuit also includes a first capacitor, which is connected in parallel with the second resistor.

5. The power supply module according to claim 1, characterized in that, The power supply module further includes a first inductor, and the output pin of the first power chip is connected to the first voltage output terminal via the first inductor.

6. The power supply module according to claim 1, characterized in that, The power supply module further includes a first voltage divider module, and the first power chip also has a feedback pin, which is connected to the first voltage output terminal via the first voltage divider module. The first voltage divider module includes a third resistor and a fourth resistor, which are connected in series. One end of the third resistor is connected to the first voltage output terminal, and the other end of the third resistor is connected to the feedback pin of the first power chip. One end of the fourth resistor is connected to the feedback pin of the first power chip, and the other end of the fourth resistor is grounded.

7. The power supply module according to claim 1, characterized in that, The power supply module further includes a first filter capacitor and a second filter capacitor. One end of the first filter capacitor is connected to the power supply terminal, and the other end of the first filter capacitor is grounded. One end of the second filter capacitor is connected to the first voltage output terminal, and the other end of the second filter capacitor is grounded.

8. The power supply module according to any one of claims 1-7, characterized in that, The power supply module also includes a second RC circuit, a third RC circuit, a second power chip, a third power chip, a second inductor, a third inductor, a second voltage divider module, and a third voltage divider module; The second power chip has an input pin, an enable pin, an output pin, and a feedback pin; the input pin of the second power chip is connected to the power supply terminal, the enable pin of the second power chip is connected to the power supply terminal via the second RC circuit, the output pin of the second power chip is connected to the second voltage output terminal via the second inductor, and the feedback pin of the second power chip is connected to the second voltage output terminal via the second voltage divider module. The third power chip has an input pin, an enable pin, an output pin, and a feedback pin; the input pin of the third power chip is connected to the power supply terminal, the enable pin of the third power chip is connected to the power supply terminal via the third RC circuit, the output pin of the third power chip is connected to the third voltage output terminal via the third inductor, and the feedback pin of the third power chip is connected to the third voltage output terminal via the third voltage divider module. The output voltages of the first voltage output terminal, the second voltage output terminal, and the third voltage output terminal are all different.

9. The power supply module according to claim 8, characterized in that, The Zener diode has a Zener voltage of 3.3 volts, the first voltage output terminal has an output voltage of 3.3 volts, the second voltage output terminal has an output voltage of 1.8 volts, and the third voltage output terminal has an output voltage of 0.8 or 0.9 volts.

10. A SoC chip, characterized in that, include: The power supply module according to any one of claims 1-9.

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