CN114489211A - Fuse fusing method and circuit of multiplexing switch - Google Patents
Fuse fusing method and circuit of multiplexing switch Download PDFInfo
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- CN114489211A CN114489211A CN202210066004.4A CN202210066004A CN114489211A CN 114489211 A CN114489211 A CN 114489211A CN 202210066004 A CN202210066004 A CN 202210066004A CN 114489211 A CN114489211 A CN 114489211A
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- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
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- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
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Abstract
The invention provides a fuse fusing method of a multiplexing switch and a circuit thereof. The method couples a switch between a reference power terminal and a supply voltage terminal for normally supplying an internal power to an internal circuit, and adjusts an on-resistance of the switch to supply a fusing current to the fuse by controlling a control terminal voltage of the switch when a fusing signal has an effective value. The invention can be used for meeting the requirement of fusing the fuse wire, improving the utilization efficiency of the circuit and reducing the chip area and the cost.
Description
Technical Field
The invention relates to the field of electronics, in particular but not exclusively to a fuse fusing method and a fuse fusing circuit of a multiplexing power supply switch.
Background
Fuse blowing (Fuse Trimming) is a method of changing the state of a circuit by applying a voltage to blow a connection (generally, a polysilicon Fuse) in the circuit when a large current passes through the connection. The circuit is widely applied to integrated circuits, and is often used for high circuit precision and changing parameter settings such as frequency, circuit function and the like before leaving a factory so as to achieve the purposes of changing circuit characteristics and improving production yield.
Fuse blowing circuits are typically low voltage (e.g., 5 volt) circuits, and blowing fuses typically requires tens or hundreds of milliamps for tens of microseconds. It is common practice to connect the fusing circuit and the input pin with a switch tube of a larger size to supply the fusing current to the fusing circuit. Generally, the input pin is a pin with a higher voltage, and a larger-sized switching tube is needed. This increases system cost and volume.
If this current is obtained from the internal power supply (usually low voltage) of the chip, it is required that this power supply has a current supply capability of at least several tens of milliamperes, which is not available in the internal power supply of a general power supply chip.
In view of the above, there is a need to provide a new structure or control method to solve at least some of the above problems.
Disclosure of Invention
At least in view of one or more of the problems in the background art, the present invention provides a fuse blowing method for a multiplexing switch and a corresponding circuit.
According to one aspect of the invention, a circuit for fuse blowing comprises: the switch is provided with a first end, a second end and a control end, wherein the first end of the switch is used for receiving input voltage, the second end of the switch is coupled with a power supply voltage end, and the power supply voltage end is coupled with an internal circuit and a fuse blowing circuit; the switch control circuit receives the fusing signal, controls the control end voltage of the switch to be a first voltage when the fusing signal is in a first state, and the switch has a first conduction state and is used for providing power supply voltage for the internal circuit; when the fusing signal is in a second state, the switch control circuit controls the control end voltage of the switch to be a second voltage, and the switch has a second conduction state and is used for providing fusing current for the fuse fusing circuit.
In one embodiment, the on-resistance of the switch in the first conducting state is greater than the on-resistance of the switch in the second conducting state. .
In one embodiment, the switch includes an N-type MOSFET, wherein a drain of the switch receives the input voltage and a source of the switch is coupled to the internal circuit and the fuse blow circuit.
In one embodiment, the first state is a low signal and the second state is a high signal.
In one embodiment, the first voltage is less than the second voltage, and the on-resistance of the switch under the control of the first voltage is higher than the on-resistance of the switch under the control of the second voltage.
In one embodiment, a switch control circuit includes: the control end of the first control switch is controlled by the fusing signal, and the first end of the first control switch is grounded; the control end of the second control switch is controlled by the fusing signal, and the first end of the second control switch is coupled with the power supply voltage end; the anode of the voltage regulator tube is coupled with the second end of the first control switch and the second end of the second control switch, and the cathode of the voltage regulator tube is coupled with the control end of the switch and the output end of the current source; when the fusing signal is in a first state, the first control switch is switched on, the second control switch is switched off, the anode of the voltage-stabilizing tube is grounded, the voltage of the control end of the switch is clamped by the voltage of the voltage-stabilizing tube, and the switch is in a first conducting state; when the fusing signal is in a second state, the second control switch is switched on, the first control switch is switched off, the anode of the voltage-stabilizing tube is coupled with the power supply voltage end to lift the voltage of the control end of the switch, and the switch is in the second conducting state to reduce the on-resistance for providing fusing current for the fuse fusing circuit.
In one embodiment, the current source comprises: the input end of the charge pump is coupled with the input voltage; and the first end of the resistor is coupled with the output end of the charge pump, and the second end of the resistor is coupled with the cathode of the voltage regulator tube and the control end of the switch.
In one embodiment, when the switch is in a first conducting state, the voltage of the power supply voltage is controlled by the voltage of the voltage regulator tube, and the switch is provided with a first conducting resistor; when the switch is in a second conduction state, the voltage of the power supply voltage is controlled by the voltage of the charge pump or the input voltage, and the switch is provided with a second conduction resistor, wherein the first conduction resistor is larger than the second conduction resistor.
In one embodiment, when the switch is in the second on state, if the input voltage is greater than a first threshold (e.g., Vcp-Vth), the supply voltage terminal voltage VDD is controlled by the charge pump output voltage Vcp, VDD ═ Vcp-Vth, where Vth is the intrinsic threshold voltage of the switch, and if the input voltage is less than a second threshold, the supply voltage terminal voltage VDD is controlled by the input voltage Vin, VDD ═ Vin-Vds, where Vds is the on-state voltage drop of the switch, and where the first threshold is greater than or equal to the second threshold.
According to another aspect of the present invention, a fuse blowing method of a multiplexing switch includes: coupling a switch between a reference power supply terminal and a supply voltage terminal for forming a supply voltage for powering the internal circuit; and reducing the on-resistance of the switch by controlling the control terminal voltage of the switch for providing the blowing current for the fuse.
In one embodiment, the method in which the control terminal voltage of the control switch reduces the on-resistance of the switch comprises increasing the control terminal voltage of the switch by controlling the state of both control switches.
In one embodiment, the method of forming the supply voltage to supply the internal circuit includes providing a control terminal voltage of the switch with a first voltage, and generating the supply voltage to supply the internal circuit at the supply voltage terminal following the first voltage.
In one embodiment, the method further comprises: coupling the control end of the switch to the cathode of the voltage regulator tube and the output end of the charge pump; coupling a first control switch between ground and an anode of a voltage regulator tube; coupling a second control switch between a power supply voltage end and an anode of a voltage regulator tube; and switching between normal operation and supply of the fusing current by controlling the states of the second control switch and the first control switch.
The circuit for fusing the fuse wire and the fuse wire fusing method of the multiplexing switch can be used for meeting the requirement of fusing the fuse wire, improving the utilization efficiency of the circuit and reducing the chip area and the cost.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 illustrates a block diagram of a circuit for fuse blowing of a multiplexed internal power supply switch, in accordance with an embodiment of the invention;
FIG. 2 shows a schematic circuit diagram for fuse blowing according to an embodiment of the invention.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
The description in this section is for several exemplary embodiments only, and the present invention is not limited only to the scope of the embodiments described. Combinations of different embodiments, and substitutions of features from different embodiments, or similar prior art means may be substituted for or substituted for features of the embodiments shown and described.
The term "coupled" or "connected" in this specification includes both direct and indirect connections. An indirect connection is a connection made through an intermediate medium, such as a conductor, wherein the electrically conductive medium may contain parasitic inductance or parasitic capacitance, or through an intermediate circuit or component as described in the embodiments in the specification; indirect connections may also include connections through other active or passive devices that perform the same or similar function, such as connections through circuitry or components of inverters, switches, inverter signal amplification circuits, follower circuits, and so forth. "plurality" or "plurality" means two or more.
FIG. 1 shows a block diagram of a circuit for fuse blowing that shares a switch with an internal power supply circuit according to an embodiment of the invention. The circuit for fusing the Fuse wire comprises a switch M1 and a switch control circuit 11, the switch control circuit 11 controls a switch M1 based on a fusing signal Fuse, so that the switch M1 is in a first conduction state when the fusing signal Fuse is in an invalid state, the switch M1 is controlled to work in a second conduction state when the fusing signal Fuse is in the valid state, the on-resistance of a switch M1 is reduced, a larger fusing current is provided for fusing the Fuse wire fusing circuit 13, and parameter trimming of the circuit is achieved. That is, the switch control circuit 11 regulates the voltage of the supply voltage terminal VDD for providing the blowing current by controlling the control terminal voltage of the switch M1. The switch M1 is coupled between the reference power source terminal Vin and the power supply voltage terminal VDD for forming a power supply voltage to provide a power supply for the internal circuit 12, and when the Fuse signal Fuse is in an active state, the on-resistance of the switch M1 is reduced by controlling the control terminal voltage Vgate of the switch M1, and a Fuse is provided with a Fuse current by using the input voltage Vin of the reference power source terminal Vin and the switch M1. The switch M1 has a first terminal c1, a second terminal c2 and a control terminal c 0. In one embodiment, the input voltage is received from the outside through a reference power terminal Vin, which forms an input voltage pin of the control chip. In another embodiment, the reference power source terminal Vin is a node inside the chip, and provides a reference voltage source. Preferably, the first terminal c1 of the switch M1 is used for receiving the input voltage Vin, and the second terminal c2 of the switch M2 is coupled to the supply voltage terminal VDD, wherein the supply voltage terminal VDD is coupled to the internal circuit power supply 12 and the fuse blowing circuit 13. The switch control circuit 11 receives the Fuse signal Fuse, when the Fuse signal Fuse is in a first state (an inactive state, such as a low level), the switch control circuit 11 controls the control terminal voltage of the switch M1 to be a first voltage, and the switch M1 operates in a first conduction state, such as a saturation state, so that the switch M1 has a higher conduction resistance, and the internal power supply VDD is determined by the switch control terminal voltage and is used for providing a power supply voltage for the internal circuit 12; when the Fuse signal Fuse is in the second state (active state, e.g. high level), the switch control circuit 11 controls the control terminal voltage of the switch M1 to be the second voltage, the switch M1 operates in the second conducting state, e.g. linear region, and the on-resistance of the switch decreases to provide sufficient Fuse blowing current for the Fuse blowing circuit 12. Preferably, the second voltage is higher than the first voltage. By multiplexing the switch of the internal power supply, the fuse fusing function is realized, the use of fusing a high-voltage switch tube is saved, and the system volume and the cost are reduced.
FIG. 2 shows a schematic circuit diagram for fuse blowing according to an embodiment of the invention. The circuit comprises a switch M1 and a switch control circuit 20, the switch control circuit 20 controlling the voltage of the supply voltage terminal VDD by controlling the voltage Vgate at the control terminal of the switch M1. In the illustrated embodiment, switch M1 includes an N-type MOSFET (metal oxide semiconductor field effect transistor), wherein the drain of switch M1 receives the input voltage Vin, the source of switch M1 is coupled to internal circuit 22 and fuse blow circuit 23 and forms the supply voltage terminal VDD, and the source of switch M1 provides an internal power supply for powering the internal circuit 22 and optionally also for providing a blow current to fuse blow circuit 23 to enable trimming of circuit parameters. In other embodiments, the switch M1 may also be implemented by other devices, such as a Junction Field Effect Transistor (JFET) or a triode, or by a P-type doped transistor, and the functions of the switch are controlled and switched by setting different control terminal voltages. Of course, other circuits or devices may be included between the reference power terminal Vin and the first terminal of the switch M1, or between the second terminal of the switch M1 and the supply voltage terminal VDD, for simple conversion or control of the input voltage or the supply voltage. In one embodiment, the fuse blowing circuit 23 includes a fuse, one end of the fuse is coupled to the supply voltage terminal VDD, the other end of the fuse is coupled to the ground GND, the fuse is further coupled to a resistor or a capacitor waiting for trimming device, when the on-resistance of the switch M1 decreases, the input voltage Vin can provide a larger current to the fuse blowing circuit 23 through the switch M1 for blowing the fuse, and changing the connection relationship of the device to be trimmed, so as to change the parameters of the internal circuit 22 or other circuits.
The switch control circuit 20 receives the Fuse signal Fuse, when the Fuse signal Fuse is in a first state, such as a low level state or a floating state, the switch control circuit 20 controls the control end voltage of the switch M1 to be a first voltage, the switch M1 has a higher resistance, and the voltage of the power supply voltage end VDD is a first power supply voltage for providing the power supply voltage for the internal circuit 22; when the system needs to modify the circuit and the Fuse signal Fuse is in the second state, such as high level, the switch control circuit 20 controls the voltage at the control terminal of the switch M1 to be the second voltage, and the on-resistance of the switch M1 is decreased to provide the Fuse blowing circuit 23 with the blowing current. In one embodiment, the Fuse signal Fuse is at a low level and at an inactive state or a first state, and the Fuse signal Fuse is at a high level and at an active state or a second state. In one embodiment, the first voltage of the voltage Vgate at the control terminal of the switch M1 when the Fuse signal Fuse is in the inactive state is lower than the second voltage when the Fuse signal Fuse is in the active state, and the on-resistance of the switch M1 when the Fuse signal Fuse is in the inactive state is higher than the on-resistance of the switch M1 when the Fuse signal Fuse is in the active state, so that the conduction degree of the switch M1 is increased when the Fuse signal Fuse is in the active state, and the switch M1 can generate a larger current for blowing the Fuse in the Fuse blowing circuit 23 while maintaining the voltage at the supply voltage terminal VDD.
As shown in fig. 2, the switch control circuit 20 includes a first control switch K1 and a second control switch K2, wherein under the control of the fusing signal Fuse, the conducting states of the control switches K1 and K2 are reversed, and the switch M1 is used to switch the voltage level of the terminal voltage Vgate, and the conducting resistance of the switch M1 is selectively lowered to provide the fusing current. The switch control circuit 20 further includes a voltage regulator D1 and a current source in addition to the first control switch K1 and the second control switch K2. In the illustrated embodiment, the current source includes a charge pump 21 and a resistor R1, wherein an input terminal of the charge pump 21 is coupled to the input voltage Vin, a first terminal of the resistor R1 is coupled to an output terminal of the charge pump 21, and a second terminal of the resistor R1 is coupled to a cathode of the regulator D1 and a control terminal of the switch M1. The control terminals of the first control switch K1 and the second control switch K2 are both controlled by the fusing signal Fuse. In the illustrated embodiment, the switch control circuit 20 further includes an inverter INV, an input terminal of the inverter is coupled to the Fuse signal Fuse, and an output terminal of the inverter is coupled to the control terminal of the first control switch K1 and the control terminal of the second control switch K2. The first terminal of the first control switch K1 is grounded, and the second terminal of the first control switch K1 is coupled to the anode of the zener D1. A first terminal of the second control switch K2 is coupled to the supply voltage terminal VDD, and a second terminal of the second control switch K2 is coupled to the anode of the regulator D1. The cathode of the voltage regulator D1 is coupled to the control terminal of the switch M1 and the output terminal of the current source. In another embodiment, the switch control circuit 20 does not include the inverter INV, the effective value of the Fuse signal Fuse may adopt a low voltage, the ineffective value may adopt a high voltage, or the control switches K1 and K2 are interchanged and the Fuse signal Fuse is directly input to the control terminal of the control switch. The operation of the circuit will now be described with reference to fig. 2.
When the circuit normally works, the fusing signal Fuse is in an invalid state, namely a low-level state of 0, the output signal of the inverter is in a high-level state of 1, the control switch K1 is switched on, the control switch K2 is switched off, the voltage of the anode end of the voltage regulator tube D1 is grounded, the first voltage Vgate generated by the resistor R1 and the voltage regulator tube D1 on the control end of the switch M1 is the Zener breakdown voltage of the voltage regulator tube D1, and the first voltage Vgate is clamped by the voltage of the voltage regulator tube D1, for example, 6V (volt). When the switch M1 is in a first conducting state, such as operating in a saturation region, the voltage of the supply voltage terminal VDD generated by the source of the switch M1 is about Vgate-Vth, such as 5V, which follows the control terminal Vgate of the switch M1 as the internal power supply VDD to supply power to the internal circuit 22, where Vth is the inherent threshold voltage of the MOSFET M1, and the power supply terminal of the internal circuit 22 is coupled to the supply voltage terminal VDD and normally operates. If the supply current required by the internal circuit is small, such as a few milliamperes, a relatively accurate voltage value can be obtained at the supply voltage terminal VDD. If a greater current increase is desired, the size of switch M1 may be increased to increase the current supply capability of switch M1.
When the circuit needs to Fuse the Fuse wire, the Fuse signal Fuse is in a high level state "1", the output of the inverter INV is in a low level state "0", the first control switch K1 is turned off, the second control switch K2 is turned on, and the anode of the voltage regulator tube is coupled to the potential of the power supply voltage end VDD by the second control switch K2. At this time, the voltage Vgate at the control terminal of the switch M1 is increased to the second voltage, such as from the original first voltage 6V to the second voltage VDD + 6V. The switch M1 switches to the second conductive state and the on-resistance of the switch M1 decreases. At this time, if the input voltage Vin is a high voltage source and is higher than a first threshold, such as Vin > Vcp-Vth, where Vcp is the voltage output by the charge pump 21, the voltage at the supply voltage terminal VDD will follow the rising until the rising reaches Vcp-Vth, which is clamped. Through the structure, the on-resistance of the switch M1 can be reduced to provide a larger blowing current for the fuse blowing circuit 23, and the output voltage Vcp of the charge pump can be set to control the voltage of the power supply voltage end VDD not to excessively rise to the level of the high voltage source Vin, so that the safe operation of the internal circuit 22 is ensured. The input voltage Vin for the Fuse blowing trimming (the blowing signal Fuse is in the high state "1") may be set to be lower than the voltage at normal operation, for example, 6V. If the input voltage Vin is lower than a second threshold, such as Vin < Vcp-Vth, the switch M1 is in the linear region, the on-resistance of the switch M1 is very low, the voltage at the supply voltage terminal VDD approaches the input voltage Vin, the current-carrying capacity of the switch M1 is significantly increased, and a sufficient blowing current can be provided for the fuse blowing circuit 23.
The circuit provides a fuse blowing method of a multiplexing switch, a switch M1 is coupled to a reference power supply terminal Vin and a power supply voltage terminal VDD to form a power supply voltage for supplying power to an internal circuit, and the on-resistance of a control terminal voltage adjusting switch M1 of a control switch M1 is used for providing a blowing current for a fuse, so as to adjust the parameters of the circuit. Preferably, the fuse is provided with a blowing current by lowering the on-resistance of the switch by raising the voltage at the control terminal of the switch. The control terminal voltage Vgate of the switch M1 can be adjusted by controlling the states of the two control switches K1 and K2. The method in which the control terminal voltage of the control switch reduces the on-resistance of the switch may include controlling the states of the two control switches to increase the control terminal voltage of the switch. The method for forming the power supply voltage to supply the internal circuit can comprise the steps of enabling the control end voltage of the switch to have a first voltage, and generating the power supply voltage which follows the first voltage at the power supply voltage end to supply the internal circuit. Specifically, the method may further include coupling a control terminal of the switch M1 to the cathode of the regulator D1 and the output terminal of the charge pump 21, coupling a first control switch K1 between ground GND and the anode of the regulator D1, coupling a second control switch K2 between the supply voltage terminal VDD and the anode of the regulator D1, and controlling the circuit to switch between normal operation and providing the blowing current by controlling the states of the first control switch K1 and the second control switch K2. Through the design and the configuration, the fuse fusing circuit and the switch of the internal power supply are multiplexed, the additional increase of a high-voltage switch tube is avoided, meanwhile, the power supply capacity of the power supply is greatly improved, the requirement of fuse fusing is met, the utilization efficiency of the circuit is improved, and the chip area and the cost are reduced.
In the illustrated embodiment, the control switches K1 and K2 are N-type MOSFETs and P-type MOSFETs, respectively, whose control terminals receive the same signal, so that the on states of K1 and K2 are opposite. In other embodiments, the control switches K1 and K2 may be other types of switches, or switches of the same type and having control terminals coupled to the input terminal and the output terminal of the inverter INV, respectively. The regulator D1 may be replaced by another type of device, so that when the switches K1 and K2 are switched, the voltage output by the device (the control terminal voltage Vgate of the switch M1) has a first reference V1 and a second reference V2, respectively, where the second reference V2 is higher than the first reference V1, and is used to reduce the on-resistance of the switch M1, for example, so that V2 is equal to V1+ VDD. The switch control circuit is only an example, and the switch control circuit may also adopt other circuits and methods to change the control terminal voltage of the internal power switch M1 and further change the conducting state of the switch M1, so as to improve the current output capability of the circuit to blow the fuse.
Those skilled in the art will appreciate that the logic controls "high" and "low" in the logic controls referred to in the specification or the drawings may be interchanged or changed, and the subsequent logic controls may be adjusted to achieve the same functions or purposes as those of the above-described embodiments.
The description and applications of the invention herein are illustrative and are not intended to limit the scope of the invention to the embodiments described above. The descriptions related to the effects or advantages in the specification may not be reflected in practical experimental examples due to uncertainty of specific condition parameters or influence of other factors, and the descriptions related to the effects or advantages are not used for limiting the scope of the invention. Variations and modifications of the embodiments disclosed herein are possible, and alternative and equivalent various components of the embodiments will be apparent to those skilled in the art. It will be clear to those skilled in the art that the present invention may be embodied in other forms, structures, arrangements, proportions, and with other components, materials, and parts, without departing from the spirit or essential characteristics thereof. Other variations and modifications of the embodiments disclosed herein may be made without departing from the scope and spirit of the invention.
Claims (12)
1. A circuit for fuse blowing, comprising:
the switch is provided with a first end, a second end and a control end, wherein the first end of the switch is used for receiving input voltage, the second end of the switch is coupled with a power supply voltage end, and the power supply voltage end is coupled with an internal circuit and a fuse blowing circuit;
the switch control circuit receives the fusing signal, controls the control end voltage of the switch to be a first voltage when the fusing signal is in a first state, and the switch has a first conduction state and is used for providing a power supply for the internal circuit; when the fusing signal is in a second state, the switch control circuit controls the control end voltage of the switch to be a second voltage, and the switch has a second conduction state and is used for providing fusing current for the fuse fusing circuit.
2. The circuit of claim 1, wherein the switch comprises an N-type MOSFET (metal oxide semiconductor field effect transistor), a drain of the switch receives the input voltage, and a source of the switch is coupled to the internal circuit and the fuse blow circuit.
3. The circuit of claim 1, wherein the first state is a low signal and the second state is a high signal.
4. The circuit of claim 1, wherein the first voltage is less than the second voltage, and the on-resistance of the switch under the control of the first voltage is higher than the on-resistance of the switch under the control of the second voltage.
5. The circuit of any of claims 1-4, wherein the switch control circuit comprises:
the control end of the first control switch is controlled by the fusing signal, and the first end of the first control switch is grounded;
the control end of the second control switch is controlled by the fusing signal, and the first end of the second control switch is coupled with the power supply voltage end;
the anode of the voltage regulator tube is coupled with the second end of the first control switch and the second end of the second control switch, and the cathode of the voltage regulator tube is coupled with the control end of the switch and the output end of the current source;
when the fusing signal is in a first state, the first control switch is switched on, the second control switch is switched off, the anode of the voltage-stabilizing tube is grounded, the voltage of the control end of the switch is clamped by the voltage of the voltage-stabilizing tube, and the switch is in a first conducting state; when the fusing signal is in a second state, the second control switch is switched on, the first control switch is switched off, the anode of the voltage-stabilizing tube is coupled with the power supply voltage end and used for lifting the voltage of the control end of the switch, and the switch is in the second state of switching on to reduce the on-resistance and provide fusing current for the fuse fusing circuit.
6. The circuit of claim 5, wherein the current source comprises:
the input end of the charge pump receives input voltage; and
and the first end of the resistor is coupled with the output end of the charge pump, and the second end of the resistor is coupled with the cathode of the voltage regulator tube and the control end of the switch.
7. The circuit of claim 6, wherein when the switch is in the first on state, the supply voltage terminal voltage is controlled by the voltage of the regulator, the switch having a first on resistance; when the switch is in a second conduction state, the voltage of the power supply voltage end is controlled by the output voltage or the input voltage of the charge pump, and the switch is provided with a second conduction resistance, wherein the first conduction resistance is larger than the second conduction resistance.
8. The circuit of claim 6, wherein when the switch is in the second conducting state, the supply voltage terminal voltage VDD is controlled by the charge pump output voltage Vcp if the input voltage is greater than a first threshold, VDD ═ Vcp-Vth where Vth is the intrinsic threshold voltage of the switch, and is controlled by the input voltage Vin if the input voltage is less than a second threshold, VDD ═ Vin-Vds where Vds is the on-voltage drop of the switch, where the first threshold is greater than or equal to the second threshold.
9. A method of fuse blowing for a multiplexing switch, comprising:
coupling a switch between a reference power supply terminal and a supply voltage terminal for forming a supply voltage for supplying power to the internal circuit; and
the control terminal voltage of the switch is controlled to reduce the on-resistance of the switch so as to provide the fusing current for the fuse.
10. The method of claim 9, wherein controlling the control terminal voltage of the switch to reduce the on-resistance of the switch comprises controlling the states of two control switches to increase the control terminal voltage of the switch.
11. The method of claim 9, wherein forming the supply voltage to power the internal circuitry comprises causing the control terminal voltage of the switch to have a first voltage and generating the supply voltage to power the internal circuitry at the supply voltage terminal that follows the first voltage.
12. The method of claim 9, further comprising:
coupling the control end of the switch to the cathode of the voltage regulator tube and the output end of the charge pump;
coupling a first control switch between ground and an anode of a voltage regulator tube;
coupling a second control switch between a power supply voltage end and an anode of a voltage regulator tube; and
the second control switch and the first control switch are controlled by controlling the states to switch between normal operation and supplying the fusing current.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210066004.4A CN114489211A (en) | 2022-01-20 | 2022-01-20 | Fuse fusing method and circuit of multiplexing switch |
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| CN202210066004.4A CN114489211A (en) | 2022-01-20 | 2022-01-20 | Fuse fusing method and circuit of multiplexing switch |
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| CN110676241A (en) * | 2018-07-03 | 2020-01-10 | 华润矽威科技（上海）有限公司 | Electrical trimming structure for multiplexing lead PAD and multiplexing method thereof |
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| CN208520962U (en) * | 2018-05-30 | 2019-02-19 | 东莞赛微微电子有限公司 | A kind of fuse state detection device |
| CN110676241A (en) * | 2018-07-03 | 2020-01-10 | 华润矽威科技（上海）有限公司 | Electrical trimming structure for multiplexing lead PAD and multiplexing method thereof |
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