System with programming function
By introducing a second power supply unit to the system for power supply, the problems of increasing silicon area and reducing LDO transient response in the prior art due to increasing the area of the high-voltage output tube are solved, and the effect of significantly reducing silicon area and improving area utilization is achieved.
Patent Information
- Application Number
- CN202422094991.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-27
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-08-27
AI Technical Summary
The prior art requires increasing the area of the high voltage output tube when meeting the low on-resistance requirements required for power supply for fuse operation, resulting in a significant increase in the silicon area and potentially reducing the transient response of the LDO.
By using a second power supply unit for fuse power supply, instead of increasing the area of the output tube, it can meet the low on-resistance requirements required for power supply for fuse operation. The system includes a first power supply unit, a second power supply unit and a writing unit, which is used to shield the output voltage of the first power supply unit and power the writing unit.
The required silicon area is significantly reduced, area utilization is improved, and more flexibility is provided through power supply control signals to meet the low on-resistance requirements for fuse operations.
Smart Images
Figure CN223052760U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of integrated circuits, and particularly relates to a system with a programming function. Background Art
[0002] For systems such as DC-DC converters or system-on-chips (SOCs), a high input voltage and a low-output LDO (low dropout linear regulator) are usually used to provide a power supply rail for low-voltage circuits, and this power supply rail can also be connected to (but not limited to) analog / logical functions and even to a fuse operation block together with the required fine-tuning function.
[0003] Fuse operation usually requires a high current for a short time while maintaining a minimum supply voltage across the fuse to ensure reliable fusing of the fuse. Therefore, this imposes additional constraints on the internal power supply rail.
[0004] As Figure 1 shown, a possible method is to increase the size of the high-voltage output transistor M0 of the LDO or to operate in a differential mode under an external voltage source, which reduces the on-resistance of the output transistor M0 and reduces the voltage across the output transistor M0. In turn, this will maximize the supply voltage across the fuse during the fuse operation.
[0005] However, due to the use of area-intensive high-voltage output transistors M0, this increase will significantly increase the silicon area, especially when the input voltage reaches 80V, 100V or higher.
[0006] In addition, as the size of the high-voltage output transistor increases, its parasitic gate capacitance will also increase, which may reduce the transient response of the LDO and may require additional circuit adjustments.
[0007] The information disclosed in this background art section is only intended to enhance the overall understanding of the present utility model and should not be regarded as an admission or any form of implication that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Utility Model
[0008] The purpose of the present utility model is to provide a system with a programming function, which can meet the requirement of low on-resistance for power supply during fuse operation without increasing the size of the high-voltage output transistor.
[0009] To achieve the above purpose, a specific embodiment of the present utility model provides a system with a programming function, including: a first power supply unit, a second power supply unit, and a programming unit;
[0010] The first power supply unit includes an output transistor. The first end or the second end of the output transistor is the output end of the first power supply unit. The output end of the second power supply unit is connected to the output end of the first power supply unit and the programming unit. The second power supply unit is used to shield the output voltage of the first power supply unit and supply power to the programming unit.
[0011] In one or more embodiments of the present invention, the programming unit includes one or more programming modules. The programming module includes a first control module and a fuse. The first control module is connected to the output end of the first power supply unit, the output end of the second power supply unit, and the fuse. The first control module is used to control the on / off between the output end of the second power supply unit and the output end of the first power supply unit and the fuse based on a fusing control signal.
[0012] In one or more embodiments of the present invention, the first control module includes a first transistor. The first end of the first transistor is connected to the output end of the second power supply unit and the output end of the first power supply unit. The second end of the first transistor is connected to the first end of the fuse. The second end of the fuse is connected to a reference signal. The control end of the first transistor is used to receive the fusing control signal.
[0013] In one or more embodiments of the present invention, the first control module further includes a first inverter. The input end of the first inverter is used to receive the fusing control signal. The output end of the first inverter is connected to the control end of the first transistor.
[0014] In one or more embodiments of the present invention, the second power supply unit includes a second control module and a voltage source. The second control module is connected to the programming unit, the output end of the first power supply unit, and the voltage source. The second control module is used to control the on / off between the output end of the first power supply unit and the programming unit and the voltage source based on a power supply control signal.
[0015] In one or more embodiments of the present invention, the second control module includes a second transistor. The first end of the second transistor is connected to the output end of the first power supply unit and the programming unit. The second end of the second transistor is connected to the voltage source.
[0016] In one or more embodiments of the present invention, the second control module further includes a second inverter. The input end of the second inverter is used to receive the power supply control signal. The output end of the second inverter is connected to the control end of the second transistor.
[0017] In one or more embodiments of the present invention, the second control module further includes a third transistor. The first end and the second end of the third transistor are respectively connected to the voltage source and the reference signal.
[0018] In one or more embodiments of the present utility model, the first power supply unit includes a low dropout linear regulator.
[0019] In one or more embodiments of the present utility model, the system with a programming function includes a chip. The first power supply unit, the programming unit, and the second control module are all disposed within the chip. The voltage source is disposed outside the chip. The chip has a pin, and the voltage source is connected to the second control module through the pin.
[0020] Compared with the prior art, in the system with a programming function of the present utility model, by using a second power supply unit for fusing power supply to replace the requirement of increasing the area of the output transistor to meet the low on-resistance required for fusing operation power supply, the silicon area required can be significantly reduced, and the area utilization rate can be improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0022] Figure 1 It is a circuit schematic diagram of a system with a programming function in an embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0023] In order to enable those skilled in the art of the present technology to better understand the technical solutions in the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0024] The terms "coupled", "connected", or "linked" in the specification include both direct connections and indirect connections. An indirect connection is a connection through an intermediate medium, such as a connection through an electrical conduction medium, which may have parasitic inductance or parasitic capacitance; an indirect connection may also include a connection through other active or passive devices on the basis of achieving the same or similar functional purposes, such as a connection through circuits or components such as switches, follower circuits, etc. Additionally, in the utility model, words such as "first", "second", etc. are mainly used to distinguish one technical feature from another technical feature, and do not necessarily require or imply that there is a certain actual relationship, quantity, or order between these technical features.
[0025] In the detailed description of the specification, reference is made to the accompanying drawings that form a part thereof, in which like reference numerals always refer to like components, and which are shown by way of exemplary embodiments that may be implemented. It should be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present disclosure. Accordingly, the following detailed description should not be construed in a limiting sense.
[0026] The various operations in the specification may be described sequentially as a number of discrete actions or operations in a manner most helpful in understanding the claimed subject matter. However, the order of description should not be construed as implying that these operations must be order-dependent. Specifically, these operations may not be performed in the order presented. The described operations may be performed in an order different from the described embodiments. Various additional operations may be performed in additional embodiments and / or the described operations may be omitted.
[0027] For the purposes of the present disclosure, the phrase "A and / or B" means (A), (B), or (A and B). For the purposes of the present disclosure, the phrase "A, B, and / or C" means (A), (B), (C), (A and B), (A and C), (B and C), or (A, B, and C).
[0028] Various components and devices may be referred to or shown herein in the singular form (e.g., "MOS transistor", "transistor", "switch", etc.), but this is merely for convenience of discussion, and any element referred to in the singular form may include a plurality of such elements in accordance with the teachings herein.
[0029] The specification describes the use of the phrases "in one embodiment", "in other embodiments", or "in some embodiments", which may each refer to one or more of the same or different embodiments. Additionally, the terms "comprising", "including", "having", etc. used with respect to the embodiments of the present disclosure are synonymous.
[0030] As Figure 1As shown, a system with a programming function in an embodiment of the present utility model includes: a first power supply unit 10, a second power supply unit 20, and a programming unit 30.
[0031] Among them, the first power supply unit 10 can be various power supply circuits, including but not limited to power converters such as low-dropout linear regulators and DC-DC converters. Hereinafter, an example in which the first power supply unit 10 is a low-dropout linear regulator will be described.
[0032] Specifically, the first power supply unit 10 includes an amplifier U1, an output transistor M0, a first resistor R1, a second resistor R2, and a capacitor C. The inverting input terminal of the amplifier U1 is connected to the first voltage source V1, the output terminal of the amplifier U1 is connected to the control terminal of the output transistor M0, the first terminal of the output transistor M0 is connected to the second power source V2, the second terminal of the output transistor M0 is the output terminal VOUT of the first power supply unit 10 and is connected to the first terminal of the first resistor R1 to generate an output voltage. The second terminal of the first resistor R1 is connected to the first terminal of the second resistor R2 and the non-inverting input terminal of the amplifier U1, and the second terminal of the second resistor R2 is connected to a reference signal. In one embodiment, the reference signal is a ground voltage signal.
[0033] The output terminal of the second power supply unit 20 is connected to the output terminal VOUT of the first power supply unit 10 and the programming unit 30. The second power supply unit 20 is used to shield the output voltage of the first power supply unit 10 and supply power to the programming unit 30. In other embodiments, the first power supply unit 10 can also be a low-dropout linear regulator with other structures.
[0034] The programming unit 30 includes one or more programming modules. Among them, each programming module includes a first inverter IN1, a first control module, and a fuse Fuse. The first control module is connected to the output terminal VOUT of the first power supply unit 10, the output terminal of the second power supply unit 20, and the first terminal of the fuse Fuse. The second terminal of the fuse Fuse is connected to a reference signal. The first control module is used to control the on / off between the output terminal of the second power supply unit 20, the output terminal VOUT of the first power supply unit 10, and the fuse Fuse based on the fusing control signal Bit_x.
[0035] Such as Figure 1As shown, the first control module includes a first inverter IN1 and a first transistor M1. The first end of the first transistor M1 is connected to the output end of the second power supply unit 20 and the output end VOUT of the first power supply unit 10. The second end of the first transistor M1 is connected to the first end of the fuse Fuse. The second end of the fuse Fuse is connected to the reference signal. The control end of the first transistor M1 is connected to the output end of the first inverter IN1. The input end of the first inverter IN1 is used to receive the fusing control signal Bit_x. By setting the first inverter IN1, the first transistor M1 can be turned on when the fusing control signal Bit_x is at a high level. In other embodiments, the first inverter IN1 may not be provided. In this case, the first transistor M1 can be turned on when the fusing control signal Bit_x is at a low level.
[0036] In one embodiment, multiple programming modules share a first power supply unit 10 and a second power supply unit 20. Through the combination of high and low levels of a set of control signals Bit_x, each first control module corresponding to one or more fuses Fuse to be fused can be selectively turned on, so as to perform fusing through the voltage output by the second power supply unit 20.
[0037] As Figure 1 shown, the second power supply unit 20 includes a second control module and a voltage source V3. The second control module is connected to the programming unit 30, the output end VOUT of the first power supply unit 10, and the voltage source V3. The second control module is used to control the on / off between the output end VOUT of the first power supply unit 10 and the programming unit 30 and the voltage source V3 based on the power supply control signal Burn.
[0038] Among them, the second control module includes a second transistor M2, a third transistor M3, and a second inverter IN2. The first end of the second transistor M2 is connected to the output end VOUT of the first power supply unit 10 and the first end of the first transistor M1 of the programming unit 30. The second end of the second transistor M2 is connected to the first end of the voltage source V3 and the second end of the third transistor M3. The first end of the third transistor M3 and the second end of the voltage source V3 are connected to the reference signal. The control end of the third transistor M3 is floating. The input end of the second inverter IN2 is used to receive the power supply control signal Burn. The output end of the second inverter IN2 is connected to the control end of the second transistor M2. By setting the second inverter IN2, the second transistor M2 can be turned on when the power supply control signal Burn is at a high level. In other embodiments, the second inverter IN2 may not be provided. In this case, the second transistor M2 can be turned on when the power supply control signal Burn is at a low level.
[0039] In one embodiment, the output transistor M0, the first transistor M1, and the second transistor M2 are P-channel MOS transistors. The output transistor M0 is a high-voltage tolerant device, the second transistor M2 is a low-voltage device, the power supply control signal Burn is a low-voltage control signal, and the third transistor M3 is an n-channel MOS transistor. The first ends of the output transistor M0, the first transistor M1, the second transistor M2, and the third transistor M3 are the source electrodes. The second ends of the output transistor M0, the first transistor M1, the second transistor M2, and the third transistor M3 are the drain electrodes. The control ends of the output transistor M0, the first transistor M1, the second transistor M2, and the third transistor M3 are the gate electrodes.
[0040] In other embodiments, the output transistor M0, the first transistor M1, and the second transistor M2 may be n-channel MOS transistors, and the third transistor M3 may be a p-channel MOS transistor.
[0041] In one embodiment, as Figure 1 shown, the system with a programming function further includes a chip 100. Among them, the first power supply unit 10, the programming unit 30, and the second control module are all disposed inside the chip 100. The voltage source V3 is disposed outside the chip 100. The chip 100 has a pin P. The voltage source V3 is connected to the second end of the second transistor M2 of the second control module through the pin P. The voltage generated by the first power supply unit 10 is used to supply power to other analog circuits and / or digital circuits inside the chip 100.
[0042] When no fusing operation is required, the first power supply unit 10 operates normally. The voltage generated by the first power supply unit 10 can supply other circuits. The second transistor M2 is in an off state under the control of the power supply control signal Burn. The pin P is in a high-impedance state based on the third transistor M3. Forming a high-impedance state through the third transistor M3 can prevent the voltage of the voltage source V3 from affecting other circuits inside the chip 100.
[0043] When performing a fusing operation, the power supply control signal Burn is pulled high, and the second transistor M2 is turned on, so that the voltage generated by the voltage source V3 is introduced into the output terminal VOUT of the first power supply unit 10 through the pin P. Since the voltage generated by the voltage source V3 is greater than the voltage output by the output terminal VOUT of the first power supply unit 10, the voltage generated by the voltage source V3 will cause the amplifier U1 to output a high level and turn off the output transistor after voltage division and feedback by the first resistor R1 and the second resistor R2. At this time, the programming unit 30 is powered by the voltage source V3. The fusing control signal Bit_x corresponding to the fuse Fuse to be fused is set to a high level, and the first transistor M1 is turned on, thereby fusing the fuse Fuse.
[0044] In this embodiment, by using a low-voltage device (the second transistor M2) and a low-voltage control signal (the power supply control signal Burn), the design of the first power supply unit 10 can be simplified, and there is no need to adjust the high-voltage-resistant device (the output transistor M0) in the first power supply unit 10. The duration of the high-level power supply control signal Burn can also be adjusted accordingly according to system requirements (such as the time requirement for fusing the fuse).
[0045] Since the size of the low-voltage device can be adjusted accordingly according to the on-resistance requirement of the fusing operation, the low on-resistance requirement for the power supply of the fusing operation can be met. Therefore, compared with increasing the area of the densely arranged high-voltage-resistant devices (the output transistor M0) to meet the continuously increasing input voltage, using the low-voltage device significantly reduces the silicon area required for reliable fusing operation, significantly improves the area utilization rate, and provides more flexibility through the power supply control signal Burn.
[0046] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.
[0047] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A system with a programming function, characterized in that: include: A first power supply unit, a second power supply unit and a programming unit; The first power supply unit includes an output tube, the first end of the output tube or the second end of the output tube is the output end of the first power supply unit, the output end of the second power supply unit is connected to the output end of the first power supply unit and the burning unit, and the second power supply unit is used to shield the output voltage of the first power supply unit and supply power to the burning unit.
2. The system with programming function according to claim 1, characterized in that: The burning unit includes one or more burning modules, and the burning module includes a first control module and a fuse. The first control module is connected to the output end of the first power supply unit, the output end of the second power supply unit and the fuse. The first control module is used to control the connection and disconnection between the output end of the second power supply unit and the output end of the first power supply unit and the fuse based on a fuse control signal.
3. The system with programming function according to claim 2, characterized in that: The first control module includes a first transistor, a first end of the first transistor is connected to the output end of the second power supply unit and the output end of the first power supply unit, a second end of the first transistor is connected to the first end of the fuse, a second end of the fuse is connected to a reference signal, and a control end of the first transistor is used to receive a fuse control signal.
4. The system with programming function according to claim 3, characterized in that: The first control module further includes a first inverter, an input end of the first inverter is used to receive a fuse control signal, and an output end of the first inverter is connected to a control end of the first transistor.
5. The system with programming function according to claim 1, characterized in that: The second power supply unit includes a second control module and a voltage source. The second control module is connected to the burning unit, the output end of the first power supply unit and the voltage source. The second control module is used to control the output end of the first power supply unit and the on-off between the burning unit and the voltage source based on a power supply control signal.
6. The system with programming function according to claim 5, characterized in that: The second control module includes a second transistor, a first end of the second transistor is connected to the output end of the first power supply unit and the programming unit, and a second end of the second transistor is connected to a voltage source.
7. The system with programming function according to claim 6, characterized in that: The second control module further includes a second inverter, an input end of the second inverter is used to receive a power supply control signal, and an output end of the second inverter is connected to a control end of the second transistor.
8. The system with programming function according to claim 6, characterized in that: The second control module further includes a third transistor, wherein a first end of the third transistor and a second end of the third transistor are respectively connected to a voltage source and a reference signal.
9. The system with programming function according to claim 1, characterized in that: The first power supply unit includes a low voltage dropout linear regulator.
10. The system with programming function according to claim 5, characterized in that: The system with burning function includes a chip, the first power supply unit, the burning unit and the second control module are all arranged in the chip, the voltage source is arranged outside the chip, the chip has a pin, and the voltage source is connected to the second control module through the pin.