Electronic fuse, electronic fuse package, and method of controlling an electronic fuse switch

Abstract

According to some embodiments, electronic fuses, electronic fuse packages, and methods for controlling electronic fuse switches are provided. An electronic fuse includes a switch, an analog current sense leg configured to generate a first sensed load current of the switch, a digital current sense leg configured to generate a second sensed load current of the switch, a switch detector configured to select between the first sensed load current and the second sensed load current to generate a load monitor current of the switch based on an operating mode of the switch, and a controller configured to control the switch based on the load monitor current.

Description

Technical Field

[0001] This disclosure pertains to the field of protection circuits. Background Technology

[0002] Overcurrent protection can be provided to devices using fuses, such as analog fuses. An electronic fuse (e-fuse) is an electronic device that monitors the load current and interrupts the current when it exceeds an overcurrent threshold. Unlike analog fuses, electronic fuses do not fail in response to overcurrent. Summary of the Invention

[0003] The present invention is provided to introduce, in a simplified form, a series of concepts further described in the detailed embodiments below. The present invention is not intended to identify key elements or essential features of the claimed subject matter, nor is it intended to limit the scope of the claimed subject matter.

[0004] According to some embodiments, an electronic fuse includes: a switch; an analog current sensing branch configured to generate a first sensed load current of the switch; a digital current sensing branch configured to generate a second sensed load current of the switch; a switching detector configured to select between the first sensed load current and the second sensed load current based on the operating mode of the switch to generate a load monitoring current of the switch; and a controller configured to control the switch based on the load monitoring current.

[0005] According to some embodiments, an electronic fuse package includes: a switch die including a switch; a controller die including an analog current sensing branch configured to generate a first sensed load current of the switch, a digital current sensing branch configured to generate a second sensed load current of the switch, a switching detector configured to select between the first sensed load current and the second sensed load current based on the operating mode of the switch to generate a load monitoring current of the switch, and a controller configured to control the switch based on the load monitoring current; an interconnect between the switch die and the controller die; and a molding compound encapsulating the switch die, the controller die, and the interconnect.

[0006] According to some embodiments, a method includes: generating a first sensed load current of an electronic fuse switch in an analog current sensing branch; generating a second sensed load current of the electronic fuse switch in a digital current sensing branch; selecting between the first sensed load current and the second sensed load current based on an operating mode of the electronic fuse switch to generate a load monitoring current of the electronic fuse switch; and controlling the electronic fuse switch based on the load monitoring current.

[0007] According to some embodiments, a system includes: means for generating a first sensed load current of an electronic fuse switch in an analog current sensing branch; means for generating a second sensed load current of an electronic fuse switch in a digital current sensing branch; means for generating a load monitoring current of an electronic fuse switch by selecting between the first sensed load current and the second sensed load current based on the operating mode of the electronic fuse switch; and means for controlling the electronic fuse switch based on the load monitoring current.

[0008] To achieve the foregoing and related objectives, the following description and accompanying drawings illustrate certain illustrative aspects and implementations. These aspects and implementations indicate only a few of the various ways in which one or more aspects may be employed. Other aspects, advantages, and novel features of this disclosure will become apparent from the following detailed description when considered in conjunction with the accompanying drawings. Attached Figure Description

[0009] Figure 1 This is a diagram illustrating an electronic fuse according to some embodiments.

[0010] Figure 2 This is a diagram illustrating an electronic fuse according to some embodiments.

[0011] Figure 3 This is a diagram illustrating an electronic fuse package according to some embodiments.

[0012] Figure 4 This is a diagram illustrating current sensing selection based on drain-source voltage according to some implementations.

[0013] Figure 5 This is a diagram illustrating current sensing selection based on drain current according to some implementations. Detailed Implementation

[0014] The claimed subject matter will now be described with reference to the accompanying drawings, in which the same reference numerals are used throughout the drawings to refer to the same elements. In the following description, numerous specific details are set forth for purposes of explanation in order to provide a thorough understanding of the claimed subject matter. However, it will be apparent that the claimed subject matter can be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form to facilitate the description of the claimed subject matter.

[0015] It should be understood that the following description of the embodiments should not be considered limiting. The scope of this disclosure is not intended to be limited by the embodiments or drawings described below, which are for illustrative purposes only. The drawings should be considered as schematic representations, and the elements shown in the drawings are not necessarily shown to scale. Rather, various elements are presented such that their function and overall use will become apparent to those skilled in the art.

[0016] All numerical values ​​in the detailed description herein and in the claims are modified to mean “about” or “approximately” and take into account experimental errors and variations that would be expected by one of ordinary skill in the art.

[0017] Reference Figure 1 A diagram of an electronic fuse 100 according to some embodiments is provided. The electronic fuse 100 includes a switch 102 and a controller 104, the controller 104 measuring the fuse current I passing through the switch 102. L To generate load monitoring current I MON The fuse current I passing through switch 102 can be reduced. L Provided to the load. A monitoring controller (not shown) associated with the load can utilize the current monitoring signal I. MON To control the load. In some implementations, if the load monitoring current I... MON If the tripping threshold is exceeded, controller 104 will disconnect switch 102.

[0018] In some implementations, switch 102 is a power field-effect transistor (FET). Controller 104 provides current sensing for all operating phases of switch 102, such as startup (e.g., charging a capacitive load), full load (high current in steady state), or light load (low current in steady state). During steady-state operation, switching detector 106 in controller 104 enables analog current sensing branch (ACSB) 108A to provide high accuracy. However, during light load operation, switching detector 106 enables digital current sensing branch (DCSB) 108D to avoid the leakage effects inherent in analog current sensing branch 108A, especially at high temperatures. Additionally, during startup, controller 104 enables digital current sensing branch 108D, thus eliminating the need for current sensing at the output voltage V of electronic fuse 100. OUT Rise and approach the input voltage V IN Previously, a power-consuming charge pump or negative power supply was used to power the analog current sensing branch 108A.

[0019] Figure 2 This is a simplified block diagram of an electronic fuse 100 according to some embodiments. Figure 2 In this diagram, rounded blocks represent signals, while rectangular blocks represent circuits. Fuse current I LA first current mirror 200A is provided to generate a scaled fuse current for the analog current sensing branch 108A, and a second current mirror 200B is provided to generate a scaled fuse current for the digital current sensing branch 108D. In some embodiments, current mirrors 200A and 200B have different scaling factors. If the same scaling factor is used, one of the current mirrors 200A and 200B can be omitted. The analog current sensing branch 108A generates the sensed load current I. SEN-A Furthermore, the digital current sensing branch 108D generates the sensing load current I. SEN-D The detector 106 is switched to determine the drain current I flowing through the switch 102. D Is it less than a predetermined threshold I representing a low load condition? D-MIN If I D D-MIN Then switch detector 106 to select I SEN-D As used to generate load monitoring current I MON The signal. If I D ≥I D-MIN Then switch detector 106 to select I SEN-A As used to generate load monitoring current I MON The signal. In some embodiments, the switching detector 106 receives a start overload signal SUO, which forces selection I during the start-up state. SEN-D To generate I MON In some implementations, the drain current I used by the switching detector 106 is... D It is generated based on the output of one of the current mirrors, 200A and 200B. Predetermined threshold I D-MIN This will depend on the scaling factor of current mirrors 200A and 200B.

[0020] Figure 3 This is a diagram of an electronic fuse package 300 according to some embodiments. In some embodiments, the electronic fuse package 300 includes a co-packaged switch die 302 and controller die 304. Interconnects provided by a lead frame or wire bonding can interconnect the switch die 302 and controller die 304. Molding compounds can be provided to encapsulate the switch die 302, controller die 304, and interconnects to provide the electronic fuse package 300. In some embodiments, the switch die 302 includes a switch 102, current mirrors 200A and 200B, and a temperature sensor 305. In some embodiments, the controller die 304 includes an analog current sensing branch 108A, a digital current sensing branch 108D, and a switching detector 106.

[0021] ​In some implementations, the analog current sensing branch 108A includes a current sensing amplifier 306—which references the output of switch 102 and amplifies the output of current mirror 200A to generate a sensed load current I. SEN-A The 108A analog current sensing branch provides high accuracy under medium to high load currents and requires no temperature compensation.

[0022] In some implementations, the digital current sensing branch 108D includes an analog-to-digital converter (ADC) 308, a digital controller 310, a digital-to-analog converter (DAC) 312 connected to the switch 102 and the current mirror 200B, and reads the output of the temperature sensor 305 (e.g., a temperature-sensitive voltage or current) to generate a temperature signal V. TEMP Temperature sensing unit 314. In some embodiments, ADC 316 receives various signals associated with electronic fuse 100, such as V IN V OUT I MON and V TEMP It is connected to the digital controller 310 to provide information for controlling the electronic fuse 100.

[0023] In some implementations, the current sensing resistor 317 generates a voltage proportional to the current generated by the current mirror 200B (i.e., the load current I). L (A scaled-down version). This voltage is provided to the ADC 308 and processed by the digital controller 310 to generate a digital sensed load current. The digital controller 310 sends the digital sensed load current to the DAC 312, and the DAC generates an analog signal to provide the sensed load current I. SEN-D Although the current sensing resistor 317 is illustrated as part of the controller die 304, it can be located within the electronic fuse package 300, outside the switch die 302 and the controller die 304, outside the electronic fuse package 300, on the printed circuit board on which the electronic fuse package 300 is mounted, or it can be omitted entirely. If the current sensing resistor 317 is omitted, the ADC 308 receives a current input that can be processed by the digital controller 310.

[0024] The load current I is generated by the current sensing resistor 317. L The output may be affected by temperature. In some implementations, the digital controller 310 is based on the temperature V read by the temperature sensor 305 and generated by the temperature sensing unit 314. TEMPTemperature compensation is performed. In some implementations, the digital controller 310 performs linear compensation for the digital current sensing branch 108D using a digital gain factor that depends on the analog output temperature V generated by the temperature sensing unit 314 and converted into a digital signal by the ADC 316. TEMP And the voltage generated by the current sensing resistor 317. The digital controller 310 can convert the digital compensation signal V... TEMPD As a bias applied to the current sensing amplifier 306, or by using the analog output temperature V from the temperature sensing unit 314 TEMP As a bias applied to the current sensing amplifier 306, it compensates for the current measurement results of the analog current sensing branch 108A. Although in Figure 3 The diagram shows both analog and digital offsets being applied to the current sensing amplifier 306, but only one of them is required.

[0025] In some embodiments, the temperature sensor 305 includes a metal resistor integrated on an interlayer dielectric above a silicon layer, with the switch 102 and current mirrors 200A and 200B formed in the silicon layer. The metal resistor is electrically insulated from but thermally coupled to the switch 102. The temperature sensing unit 314 can read the voltage across the metal resistor to generate V. TEMP In some embodiments, the temperature sensor 305 includes a silicon diode integrated within a silicon body region in which the switch 102 is formed, wherein the cathode of the diode is electrically connected to the drain of the switch 102. The temperature sensing unit 314 can read the current generated by the silicon diode to generate V. TEMP .

[0026] In some implementations, the digital controller 310 uses inputs provided by the ADC 316 to control the electronic fuse 100. This can be achieved via inputs from V... IN Subtract V OUT To determine the drain-source voltage V of the switch DS Drain-source voltage V DS This can be used to determine whether the electronic fuse 100 is in the activated state. The digital controller 310 enables the gate driver 315 to provide gate signals to the switch 102 and current mirrors 200A and 200B. If the load monitoring current I... MON If the tripping threshold is exceeded, the digital controller 310 removes the gate signal to trip the electronic fuse 100.

[0027] The switching detector 106 receives the sensed load current I from the analog current sensing branch 108A. SEN-A and the sensed load current I from the digital current sensing branch 108D SEN-DAnd by configuring the multiplexer (MUX) 319, it selects which signal to provide as the load sensing current I. MON A current sensing resistor 318 can be provided to generate the load-sensing current I. MON Proportional voltage.

[0028] Figure 4 This diagram illustrates current sensing selection based on drain-source voltage according to some embodiments. During startup, switching detector 106 receives a startup overload signal SUO from digital controller 310 to select the sensed load current I from digital current sensing branch 108D. SEN-D As the load monitoring current I MON Response to V DS Greater than or equal to threshold V DS-MIN The digital controller 310 enables the start overdrive signal SUO.

[0029] Figure 5 This is a diagram illustrating current sensing selection based on drain current according to some implementations. In steady-state operation (e.g., Figure 4 During the ON state, the digital controller 310 invalidates the start overcurrent control signal SUO and switches the detector 106 based on the drain current I of the switch 102. D (Representing the load current) to control the multiplexer 319. In some embodiments, the drain current I generated by one of the current mirrors 200A and 200B is... D The scaled version is used as the drain current I. D The representation. If the drain current I D Less than the predetermined threshold I D-MIN This indicates a low load state, so the switching detector 106 selects the I signal from the digital current sensing branch 108D. SEN-D As used to generate load monitoring current I MON The signal. If I D ≥ I D-MIN This indicates a high load condition, so the switching detector 106 selects the I signal from the analog current sensing branch 108A. SEN-A As used to generate load monitoring current I MON The signal.

[0030] Based on the operating mode of the electronic fuse 100, selection is made between the digital current sensing branch 108D and the analog current sensing branch 108A to generate the load monitoring current I. MONThis allows for the selection of the most accurate sensing branches 108D and 108A. During startup, the digital current sensing branch 108D is used, avoiding the need for a power-consuming charge pump or negative power supply for the current sensing amplifier 306 in the analog current sensing branch 108A. For light-load conditions, the digital current sensing branch 108D is selected to avoid errors caused by the offset voltage on the current sensing amplifier 306 in the analog current sensing branch 108A. For high-load conditions (i.e., any current greater than or equal to that of the low-load condition), the analog current sensing branch 108A is selected to provide the highest accuracy.

[0031] According to some embodiments, an electronic fuse includes a switch, an analog current sensing branch configured to generate a first sensed load current of the switch, a digital current sensing branch configured to generate a second sensed load current of the switch, a switching detector configured to select between the first sensed load current and the second sensed load current based on the operating mode of the switch to generate a load monitoring current of the switch, and a controller configured to control the switch based on the load monitoring current.

[0032] According to some implementations, the analog current sensing branch includes a current mirror and a current sensing amplifier. The current mirror is configured to generate a scaled signal representing the load current through the switch. The current sensing amplifier is connected to the current mirror to receive the scaled signal and is connected to the switch, and is configured to generate a first sensed load current based on the scaled signal.

[0033] According to some implementations, the digital current sensing branch includes: a current mirror configured to generate a scaled signal representing a load current through a switch; an analog-to-digital converter connected to the current mirror to receive the scaled signal and connected to the switch; and a digital-to-analog converter, wherein a controller is connected to the analog-to-digital converter and configured to generate a digitally sensed load current based on the scaled signal, and the digital-to-analog converter is configured to generate a second sensed load current based on the digitally sensed load current.

[0034] According to some implementations, the digital current sensing branch includes a current sensing resistor connected to a current mirror and an analog-to-digital converter, and the controller is configured to generate a digitally sensed load current based on the voltage drop across the current sensing resistor caused by a scaling signal.

[0035] According to some embodiments, the electronic fuse includes a temperature sensor configured to determine the temperature of the switch, wherein the controller is configured to compensate for at least one of a digitally sensed load current or a first sensed load current based on the temperature.

[0036] According to some embodiments, the electronic fuse includes an analog-to-digital converter connected to a controller and configured to receive an input voltage and an output voltage of a switch, wherein the controller is configured to determine the voltage across the switch based on the input voltage and the output voltage and to generate an overload start signal based on the voltage across the switch, and a switching detector is configured to select a second sense load current to generate a load monitoring current for the switch in response to the overload start signal.

[0037] According to some implementations, the switching detector is configured to receive a load current signal and determine the operating mode based on the load current signal.

[0038] According to some implementations, the switching detector is configured to: select a second sensed load current to generate a load monitoring current in response to determining that the operating mode is a low current state based on a load current signal being less than a predetermined threshold, and select a first sensed load current to generate a load monitoring current in response to determining that the operating mode is a high current state based on a load current signal being greater than or equal to a predetermined threshold.

[0039] According to some embodiments, an electronic fuse package includes: a switch die including a switch; a controller die including an analog current sensing branch configured to generate a first sensed load current of the switch, a digital current sensing branch configured to generate a second sensed load current of the switch, a switching detector configured to select between the first sensed load current and the second sensed load current based on the operating mode of the switch to generate a load monitoring current of the switch, and a controller configured to control the switch based on the load monitoring current; an interconnect between the switch die and the controller die; and a molding compound encapsulating the switch die, the controller die, and the interconnect.

[0040] According to some embodiments, the switching die includes: a first current mirror connected to an analog current sensing branch and configured to generate a first scaled signal representing a load current through the switch, and a second current mirror connected to a digital current sensing branch and configured to generate a second scaled signal representing a load current through the switch.

[0041] According to some implementations, the analog current sensing branch includes a current mirror and a current sensing amplifier. The current mirror is configured to generate a scaled signal representing the load current through the switch. The current sensing amplifier is connected to the current mirror to receive the scaled signal and is connected to the switch, and is configured to generate a first sensed load current based on the scaled signal.

[0042] According to some implementations, the digital current sensing branch includes: a current mirror configured to generate a scaled signal representing a load current through a switch; an analog-to-digital converter connected to the current mirror to receive the scaled signal and connected to the switch; and a digital-to-analog converter, wherein a controller is connected to the analog-to-digital converter and configured to generate a digitally sensed load current based on the scaled signal, and the digital-to-analog converter is configured to generate a second sensed load current based on the digitally sensed load current.

[0043] According to some implementations, the digital current sensing branch includes a current sensing resistor connected to a current mirror and an analog-to-digital converter, and the controller is configured to generate a digitally sensed load current based on the voltage drop across the current sensing resistor caused by a scaling signal.

[0044] According to some embodiments, the switching die includes a temperature sensor configured to determine the temperature of the switch, wherein the controller is configured to compensate for at least one of a digitally sensed load current or a first sensed load current based on the temperature.

[0045] According to some embodiments, the controller die includes an analog-to-digital converter connected to the controller and configured to receive an input voltage and an output voltage of a switch, wherein the controller is configured to: determine the voltage across the switch based on the input voltage and the output voltage, and generate a start overcurrent signal based on the voltage across the switch, and a switching detector is configured to: select a second sense load current to generate a load monitoring current for the switch in response to the start overcurrent signal.

[0046] According to some implementations, the switching detector is configured to receive a load current signal and determine the operating mode based on the load current signal.

[0047] According to some implementations, the switching detector is configured to: select a second sensed load current to generate a load monitoring current in response to determining that the operating mode is a low current state based on a load current signal being less than a predetermined threshold, and select a first sensed load current to generate a load monitoring current in response to determining that the operating mode is a high current state based on a load current signal being greater than or equal to a predetermined threshold.

[0048] According to some embodiments, a method includes: generating a first sensed load current of an electronic fuse switch in an analog current sensing branch; generating a second sensed load current of the electronic fuse switch in a digital current sensing branch; selecting between the first sensed load current and the second sensed load current based on an operating mode of the electronic fuse switch to generate a load monitoring current of the electronic fuse switch; and controlling the electronic fuse switch based on the load monitoring current.

[0049] According to some implementations, the method includes: determining the voltage across the electronic fuse switch; generating a start-up control signal based on the voltage across the electronic fuse switch; and selecting a second sensed load current to generate a load monitoring current for the electronic fuse switch in response to the start-up control signal.

[0050] According to some implementations, the method includes: receiving a load current signal; determining an operating mode based on the load current signal; selecting a second sensed load current to generate a load monitoring current in response to determining that the operating mode is a low current state based on the load current signal being less than a predetermined threshold; and selecting a first sensed load current to generate a load monitoring current in response to determining that the operating mode is a high current state based on the load current signal being greater than or equal to a predetermined threshold.

[0051] This document provides various operations for each implementation. In one implementation, one or more of the described operations may constitute computer-readable instructions stored on one or more computer-readable media that, when executed by a computing device, will cause the computing device to perform the described operations. The order in which some or all of the operations are described should not be construed as implying that these operations are necessarily sequentially related. Alternative orderings will be understood by those skilled in the art who benefit from this specification. Furthermore, it should be understood that not all operations must exist in every implementation provided herein.

[0052] Any aspect or design described herein as an "example" is not necessarily to be construed as superior to other aspects or designs. Rather, the use of the word "example" is intended to illustrate one possible aspect and / or implementation that may relate to the technology presented herein. Such examples are not necessary for such technology or are not intended to be limiting. Various implementations of such technology may include such examples, alone or in combination with other features, and / or the examples shown may be modified and / or omitted.

[0053] As used herein, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or". That is, unless otherwise stated or clearly indicated by the context, "X adopts A or B" is intended to indicate any natural inclusive arrangement. That is, if X adopts A; X adopts B; or X adopts both A and B, then "X adopts A or B" is satisfied in any of the foregoing cases. Additionally, unless otherwise stated or clearly indicated by the context, the articles "a" and "an" used herein and in the appended claims are generally to be interpreted as meaning "one or more". Furthermore, unless otherwise stated, "first", "second", etc., are not intended to imply temporal, spatial, or sequential aspects. Rather, these terms are used only as identifiers, names, etc., of features, elements, items, etc. For example, a first element and a second element generally correspond to element A and element B, or two different or two identical elements, or the same element.

[0054] Furthermore, although this disclosure has been shown and described with respect to one or more implementations, equivalent changes and modifications will occur to those skilled in the art upon reading and understanding of this specification and drawings. This disclosure includes all such modifications and changes and is limited only by the scope of the appended claims. In particular, with respect to the various functions performed by the aforementioned components (e.g., elements, resources, etc.), unless otherwise indicated, the terminology used to describe such components is intended to correspond to any component (e.g., a functionally equivalent component) that performs the specified function of the described component, even if that component is not structurally equivalent to the disclosed structure shown in the example implementations of this disclosure that performs that function. Additionally, while a particular feature of this disclosure may be disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations, such combinations may be desirable and advantageous for any given or particular application. Furthermore, with regard to the use of the terms “comprising,” “having,” “having,” “with,” or variations thereof in the detailed description or claims, these terms are intended to be inclusive in a manner similar to the term “comprising.”

Claims

1. An electronic fuse, comprising: switch; An analog current sensing branch is configured to generate a first sensing load current of the switch; A digital current sensing branch, configured to generate a second sensing load current of the switch; A switching detector is configured to select between a first sensed load current and a second sensed load current based on the operating mode of the switch to generate a load monitoring current for the switch. as well as A controller configured to control the switch based on the load monitoring current.

2. The electronic fuse according to claim 1, wherein: The analog current sensing branch includes: A current mirror, configured to generate a scaled signal representing the load current through the switch; and A current sensing amplifier, connected to the current mirror to receive the scaling signal and connected to the switch, is configured to generate the first sensed load current based on the scaling signal.

3. The electronic fuse according to claim 1, wherein: The digital current sensing branch includes: A current mirror, configured to generate a scaled signal representing the load current passing through the switch; An analog-to-digital converter, the analog-to-digital converter being connected to the current mirror to receive the scaled signal and connected to the switch; and Digital-to-analog converter, wherein: The controller is connected to the analog-to-digital converter and is configured to generate a digitally sensed load current based on the scaled signal; and The digital-to-analog converter is configured to generate the second sensed load current based on the digital sensed load current.

4. The electronic fuse according to claim 3, wherein: The digital current sensing branch includes: a current sensing resistor connected to the current mirror and the analog-to-digital converter; and The controller is configured to generate the digital sensed load current based on the voltage drop across the current sense resistor caused by the scaling signal.

5. The electronic fuse according to claim 3, comprising: A temperature sensor, configured to determine the temperature of the switch, wherein: The controller is configured to compensate for at least one of the digital sensing load current or the first sensing load current based on the temperature.

6. The electronic fuse according to claim 1, comprising: An analog-to-digital converter, connected to the controller and configured to receive the input voltage and the output voltage of the switch, wherein: The controller is configured to: The voltage across the switch is determined based on the input voltage and the output voltage; and A start-up control signal is generated based on the voltage across the switch; and The switching detector is configured to: In response to the start-up control signal, the second sensed load current is selected to generate the load monitoring current of the switch.

7. The electronic fuse according to claim 1, wherein: The switching detector is configured to: Receive load current signal; and The operating mode is determined based on the load current signal.

8. The electronic fuse according to claim 7, wherein: The switching detector is configured to: In response to determining that the operating mode is a low current state based on the load current signal being less than a predetermined threshold, the second sensed load current is selected to generate the load monitoring current; as well as In response to determining that the operating mode is a high current state based on the load current signal being greater than or equal to the predetermined threshold, the first sensed load current is selected to generate the load monitoring current.

9. An electronic fuse package, comprising: A switching die, wherein the switching die includes a switch; Controller die, the controller die comprising: An analog current sensing branch is configured to generate a first sensing load current of the switch; A digital current sensing branch, configured to generate a second sensing load current of the switch; A switching detector, configured to: select between a first sensed load current and a second sensed load current based on the operating mode of the switch to generate a load monitoring current for the switch; and A controller configured to control the switch based on the load monitoring current; The interconnect between the switch die and the controller die; and A molding compound that encapsulates the switch die, the controller die, and the interconnect.

10. The electronic fuse package according to claim 9, wherein: The switching chip includes: A first current mirror, connected to the analog current sensing branch and configured to generate a first scaled signal representing the load current through the switch; and A second current mirror is connected to the digital current sensing branch and configured to generate a second scaled signal representing the load current through the switch.

11. The electronic fuse package according to claim 9, wherein: The analog current sensing branch includes: A current mirror, configured to generate a scaled signal representing the load current through the switch; and A current sensing amplifier, connected to the current mirror to receive the scaling signal and connected to the switch, is configured to generate the first sensed load current based on the scaling signal.

12. The electronic fuse package according to claim 9, wherein: The digital current sensing branch includes: A current mirror, configured to generate a scaled signal representing the load current passing through the switch; An analog-to-digital converter, the analog-to-digital converter being connected to the current mirror to receive the scaled signal and connected to the switch; and Digital-to-analog converter, wherein: The controller is connected to the analog-to-digital converter and is configured to generate a digitally sensed load current based on the scaled signal; and The digital-to-analog converter is configured to generate the second sensed load current based on the digital sensed load current.

13. The electronic fuse package according to claim 12, wherein: The digital current sensing branch includes: a current sensing resistor connected to the current mirror and the analog-to-digital converter; and The controller is configured to generate the digital sensed load current based on the voltage drop across the current sense resistor caused by the scaling signal.

14. The electronic fuse package according to claim 12, wherein: The switching chip includes: A temperature sensor, configured to determine the temperature of the switch, wherein: The controller is configured to compensate for at least one of the digital sensing load current or the first sensing load current based on the temperature.

15. The electronic fuse package according to claim 9, wherein: The controller chip includes: An analog-to-digital converter, connected to the controller and configured to receive the input voltage and the output voltage of the switch, wherein: The controller is configured to: The voltage across the switch is determined based on the input voltage and the output voltage; and A start-up control signal is generated based on the voltage across the switch; and The switching detector is configured to: In response to the start-up control signal, the second sensed load current is selected to generate the load monitoring current of the switch.

16. The electronic fuse package according to claim 9, wherein: The switching detector is configured to: Receive load current signal; and The operating mode is determined based on the load current signal.

17. The electronic fuse package according to claim 16, wherein: The switching detector is configured to: In response to determining that the operating mode is a low current state based on the load current signal being less than a predetermined threshold, the second sensed load current is selected to generate the load monitoring current; as well as In response to determining that the operating mode is a high current state based on the load current signal being greater than or equal to the predetermined threshold, the first sensed load current is selected to generate the load monitoring current.

18. A method for controlling an electronic fuse switch, comprising: A first sensing load current is generated in the analog current sensing branch of the electronic fuse switch; A second sensing load current is generated in the digital current sensing branch of the electronic fuse switch; Based on the operating mode of the electronic fuse switch, a selection is made between the first sensed load current and the second sensed load current to generate the load monitoring current of the electronic fuse switch. as well as The electronic fuse switch is controlled based on the load monitoring current.

19. The method of claim 18, comprising: Determine the voltage across the electronic fuse switch; A start-up control signal is generated based on the voltage across the electronic fuse switch; as well as In response to the start-up control signal, the second sensed load current is selected to generate the load monitoring current of the electronic fuse switch.

20. The method of claim 18, comprising: Receive load current signal; The operating mode is determined based on the load current signal; In response to determining that the operating mode is a low current state based on the load current signal being less than a predetermined threshold, the second sensed load current is selected to generate the load monitoring current; as well as In response to determining that the operating mode is a high current state based on the load current signal being greater than or equal to the predetermined threshold, the first sensed load current is selected to generate the load monitoring current.

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