WO2015098379A1 - 半導体装置およびその設計方法 - Google Patents
半導体装置およびその設計方法 Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/0203—Particular design considerations for integrated circuits
- H01L27/0207—Geometrical layout of the components, e.g. computer aided design; custom LSI, semi-custom LSI, standard cell technique
- H01L27/0211—Geometrical layout of the components, e.g. computer aided design; custom LSI, semi-custom LSI, standard cell technique adapted for requirements of temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/0203—Particular design considerations for integrated circuits
- H01L27/0248—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67242—Apparatus for monitoring, sorting or marking
- H01L21/67248—Temperature monitoring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/0203—Particular design considerations for integrated circuits
- H01L27/0214—Particular design considerations for integrated circuits for internal polarisation, e.g. I2L
- H01L27/0218—Particular design considerations for integrated circuits for internal polarisation, e.g. I2L of field effect structures
- H01L27/0222—Charge pumping, substrate bias generation structures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/0203—Particular design considerations for integrated circuits
- H01L27/0248—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection
- H01L27/0251—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection for MOS devices
- H01L27/0266—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection for MOS devices using field effect transistors as protective elements
- H01L27/0285—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection for MOS devices using field effect transistors as protective elements bias arrangements for gate electrode of field effect transistors, e.g. RC networks, voltage partitioning circuits
Definitions
- the present invention relates to a semiconductor device and a design method thereof, and particularly relates to a semiconductor device including a heat source element and a temperature sensitive element.
- a heat source element generally corresponds to, for example, a bipolar type or MIS type power transistor in which several hundred mA to several A flows.
- the temperature-sensitive element refers to a semiconductor element that detects the temperature of the semiconductor chip on which the power transistor is formed, particularly the junction temperature of the power transistor itself.
- an active element such as a transistor or a passive element such as a diode or a resistor is used.
- the heat source element and the temperature sensitive element are employed in, for example, a voltage regulator and a DC / DC converter.
- a large current flows between the collector and the emitter of the transistor
- a large current flows between the source and the drain. Consumes a lot of power. For example, when 200 mA flows between the source and drain of the MIS transistor and a voltage of 8 V is applied between both electrodes, the power consumption of the MIS transistor is 1.6 W.
- a temperature sensitive element is arranged in the semiconductor chip, particularly in the vicinity of the power transistor, detects the temperature of the semiconductor chip, and when the temperature reaches a predetermined temperature, The operation of the semiconductor element or the entire semiconductor device is interrupted to prevent deterioration or destruction of the semiconductor device due to overheating.
- Patent Document 1 discloses a method for manufacturing a semiconductor integrated circuit device and a semiconductor integrated circuit device.
- a temperature detection circuit unit that detects the temperature during operation of the power MIS transistor and stops the operation of the power MIS transistor when the temperature is equal to or higher than a predetermined value.
- a temperature detection circuit region is arranged in the center of the power MOSFET region. The temperature detection sensitivity can be improved by arranging the temperature detection circuit region in the center of the power MOSFET region where the temperature becomes highest during the operation of the power IC, and the protection operation of the power IC can be reliably performed at an appropriate time. I can do it.
- Patent Document 2 discloses a temperature detection circuit and an overheat protection circuit.
- a diode having temperature dependency is provided in the temperature detection circuit, and the output transistor is arranged so as to surround the diode.
- the diode having temperature dependency is desired to be provided in the vicinity of the output transistor in terms of efficiency and accuracy, and the diode is arranged at the center of the output transistor (see Patent Document 2 and FIG. 5).
- Patent Document 1 and Patent Document 2 are common in that they have a heat source element and a temperature sensitive element, and the temperature sensitive element is arranged in the vicinity of the heat source element.
- the reason for arranging both elements adjacent to each other is also the same. That is, this is to improve the temperature detection sensitivity of the heat source element (power transistor).
- the inventor accounts for the ratio of the heat source element to the semiconductor chip as compared with the past.
- the optimum arrangement of the heat source element and the temperature sensitive element disclosed in Patent Document 1 and Patent Document 2 was examined. I tried to.
- the present invention provides a semiconductor device capable of improving the temperature detection accuracy of the temperature sensing element and efficiently arranging the thermal protection circuit including the temperature sensing element on the semiconductor chip, and a design method thereof. is there.
- the semiconductor device includes a heat source element and a temperature sensitive element.
- the shape of the heat source element in plan view includes a first side (11) and a second side (12) extending in a direction away from the first side (11) by a first distance x3 on the same line as the first side (11).
- the third side (13) has the second distance y1 and the same length as the first distance x3 in the substantially vertical direction of the first side (11) and the second side (12).
- a fourth side (14) connecting one end of the first side (11) and one end of the third side (13), and a second side connecting the one end of the second side (12) and the other end of the third side (13).
- the fifth side (15) and the 6th side shown by length y0 which is the same as the direction where the other end of the 1st side (11) is connected and the 4th side (14) extends, and is longer than that (16) is connected to the other end of the second side (12), and one end thereof is the same as the direction in which the fifth side (15) extends, and the seventh side indicated by a longer length y0 ( 17) and an eighth side (18) connecting the other ends of the sixth side (16) and the seventh side (17).
- the eighth side (18) has a length x0, and the temperature sensitive element is disposed in the vicinity of the third side (13).
- a semiconductor device includes a heat source element and a temperature sensitive element in a semiconductor chip, and the heat source element includes two opposing regions that sandwich the space portion and a connecting region that connects the two opposing regions.
- the temperature sensing element is arranged in a space near the connection area.
- a semiconductor device design method in which a concave heat source element having a space portion is divided into three regions, and the size and shape of the divided regions and space portions are determined.
- a step, a second step of executing a heat distribution simulation of the heat source element and the space determined in the first step, a third step of analyzing a simulation result executed in the second step, and a simulation obtained in the third step And a fourth step of determining the size of the three regions and the space based on the result.
- the concave heat source elements constituting the semiconductor device of the present invention are set to a predetermined shape size determined based on a heat distribution simulation.
- a space portion having a predetermined shape and size is defined, the temperature sensitive element can be efficiently arranged in the space portion, and the temperature detection sensitivity and detection accuracy can be increased.
- FIG. 1 is a schematic view of a semiconductor device according to the present invention.
- FIG. 2 is a layout view of a heat source element and a temperature sensitive element shown in FIG. 1.
- transformation figure of FIG. FIG. 3 is another modified view of FIG. 2.
- the temperature gradient figure of the heat distribution simulation shown in FIG. The temperature gradient figure of the heat distribution simulation shown in FIG.
- FIG. 1 is a schematic view of a semiconductor device according to the present invention.
- a heat source element HSE and a temperature sensitive element TE are formed on a semiconductor chip SCH having a silicon substrate.
- the heat source element HSE in the present invention includes output transistors used in voltage regulators, DC / DC converters, and the like, bipolar transistors serving as heat sources such as power transistors, MIS transistors, and the like.
- the temperature sensitive element TE includes a semiconductor element having a function of a so-called temperature sensor provided for monitoring the temperature of the heat source element HSE, in particular, a transistor, a diode, a resistor, and the like.
- the planar view shape of the heat source element HSE is formed in a concave shape.
- the heat source element HSE is configured by opposing regions hse1 and hse2 having a relatively large area and a connecting region hse3 having a relatively small area.
- the areas of the opposing region hse1 and the opposing region hse2 are substantially the same.
- the area of the opposing region hse1 is represented by a product of a length x1 and a length y0 extending in the direction X and the direction Y, respectively.
- the area of the opposing region hse2 is represented by a product of a length x2 and a length y0 extending in the direction X and the direction Y, respectively.
- the areas of the opposing region hse1 and the opposing region hse2 are the same.
- the area of both is set to be the same, but for the convenience of various semiconductor elements and bonding pads arranged around the heat source element HSE, wiring connecting the semiconductor elements, the areas of both are set. It is possible that the will be different.
- connection region hse3 The area of the connection region hse3 is represented by a product of a length x3 and a length y2 extending in the direction X and the direction Y, respectively.
- the connection region hse3 is located between the opposing region hse1 and the opposing region hse2, and connects the two opposing regions hse1 and hse2.
- the thermal protection circuit TSD is disposed in a space SP formed by providing the connection region hse3 between the opposing region hse1 and the opposing region hse2.
- the temperature sensitive element TE functioning as a temperature sensor is one of the thermal protection circuits TSD.
- the distance y3 from the center portion Tc of the temperature sensing element TE to one side of the connection region hse3 is set to be shorter than the shortest distances x31a and x31b from the center portion Tc of the temperature sensing element TE to the opposing regions hse1 and hse2. This is because heat is conducted from the three directions of the opposing region hse1, the opposing region hse2, and the coupling region hse3 to the entire temperature sensing element TE, but there is no heat source element HSE on the opposite side of the coupling region hse3. This is because the heat conduction in the direction Y is weaker than the heat conduction in the direction X.
- the distance between one side of the connection region hse3 and the center portion Tc of the temperature sensing element TE is shortened. More preferably, the distance from the center of the connection region hse3 to the center Tc of the temperature sensing element TE is shorter than the distance from the center of the opposing regions hse1 and hse2 to the center Tc of the temperature sensing element TE. It is to be.
- connection region hse3 and the opposing regions hse1 and hse2 is the highest, and the distance from the center portion of the connection region hse3 to the center portion Tc of the temperature sensing element TE is shortened. This is because heat conduction from the region hse3 to the temperature sensing element TE is increased and performed quickly.
- the length y0 in the direction Y of the heat source element HSE is constant, the area of the connection region hse3 and the space portion SP are in an inversely proportional relationship. That is, if the length y1 is increased, the length y2 is decreased. Conversely, if the length y2 is increased, the length y1 is decreased.
- the length y1 related to the space part SP is determined in preference to the length y2 related to the connection region hse3. This is because the size of the space SP is sufficiently secured in order to arrange the thermal protection circuit TSD. If the length y1 is determined giving priority to the size of the space SP, the area size of the connection region hse3 is affected. However, on the other hand, the size of the connection region hse3 requires a function of conducting heat to the temperature sensing element TE, and therefore requires a predetermined area or more, so that there is a limit in giving priority to the length y1.
- the size of the front end of the space SP that is, the size of the length x3, needs to be a predetermined size in order to arrange the thermal protection circuit TSD.
- the depth of the space SP that is, the size of the length y1
- the relationship between the length y0 and the length y1 is preferably 0.25 ⁇ y1 / y0 ⁇ 0.75.
- the other circuit OC is built in the semiconductor chip SCH.
- the other circuit OC includes a reference voltage source, a driver for driving an output transistor (heat source element HSE), various control circuits, and the like.
- FIG. 2 shows the arrangement of the heat source element HSE and the temperature sensitive element TE shown in FIG. 1, and is an enlarged view of the positional relationship of the overheat protection circuit TSD including the heat source element HSE and the temperature sensitive element TE.
- FIG. 2 will be described using reference numerals.
- the heat source element HSE has a concave shape.
- the heat source element HSE includes a first side 11, a second side 12, a third side 13, a fourth side 14, a fifth side 15, a sixth side 16, a seventh side 17, and It is composed of an eighth side 18.
- the first side 11 and the second side 12 are arranged on the same line and separated by a length x3, and the length x1 and the length x2 are substantially the same.
- the second side 12 extends in a direction away from the direction in which the first side 11 extends.
- the third side 13 is separated from the first side 11 and the second side 12 in the substantially vertical direction by a length y1, and the length is substantially equal to the length x3.
- the fourth side 14 extends from the end a to the end b, and its length is substantially equal to the length y1.
- the fifth side 15 extends from the end c to the end d, and its length is substantially equal to y1.
- the sixth side 16 is parallel to the fourth side 14, but the length is longer than that and extends from the end g to the end h, and the length is indicated by y0.
- the seventh side 17 is parallel to the fifth side 15 but is longer than that and extends from the end e to the end f, and the length is indicated by y0.
- the eighth side 18 is substantially parallel to the first side 11, the second side 12, and the third side 13 and extends from the end f to the end g, and the length thereof is indicated by x0. Length x0 is equal to the length plus x1, x2 and x3.
- the heat source element HSE is divided into three regions, the opposing regions hse1 and hse2, and the connecting region hse3 for convenience of explanation and for convenience of heat distribution simulation described later.
- the fourth side 14 and the fifth side 15 are extended and divided so that there are two opposing regions and one connecting region. You may make it extend in the direction X and divide
- the heat source element HSE is formed by two opposing regions sandwiching the space SP and one connection region connecting the two opposing regions.
- a point P1 indicating the central part of the opposing regions hse1 and hse2 is estimated to be the highest temperature portion in the heat source element HSE.
- the central portion of the connection region hse3 is indicated by a point P2, but it can be assumed that this point P2 is also placed at a temperature equivalent to the point P1 if the connection region hse3 is larger than a predetermined size.
- One side of the connection region hse3, that is, the center of the third side 13 is indicated by a point P3.
- the point P3 is a place closest to the center portion Tc of the temperature sensitive element in the heat source element HSE.
- the point P4 is the same as the center portion Tc of the temperature sensitive element TE.
- Point P4 The temperature detection value at the point P4 is extremely important for estimating the temperature of the heat source element HSE.
- Point P5 corresponds to the front of space part SP and is a place where the temperature can be estimated to be the lowest in space part SP. Therefore, detecting the temperature of the point P5 is extremely useful for grasping the heat distribution and the thermal gradient of the entire thermal protection circuit TSD.
- the size and shape of the space part SP are defined by the opposing regions hse1, hse2 and the connecting region hse3.
- the front of the space SP is indicated by a length x3, and the depth is indicated by a length y1.
- a thermal protection circuit TSD is disposed in the space SP.
- the shortest distance y3 between the central portion Tc of the temperature sensing element TE and the third side 13 is the shortest distance x31a between the central portion Tc (point P4) and the fourth side 14 and the shortest distance between the central portion Tc and the fifth side 15. It is set to be shorter than the distance x31b.
- the distance between the point P2 that is the central part of the connection region hse3 and the central part Tc (point P4) is shorter than the distance between the point P1 that is the central part of the opposing region hse1 and the central part Tc (point P4).
- the third side 13 is arranged on a line segment P1-P1 that connects the points P1 that are the central portions of the opposing region hse1 and the opposing region hse2, and the temperature sensing element TE is connected to the line segment P1.
- FIG. 3 shows one variation of FIG. 3 is different from FIG. 2 in that the depth of the space SP, that is, the ratio of the length y1 to the length y0 is increased.
- the ratio y1 / y0 is increased, the area of the space part SP is increased.
- the area of the connection region hse3 is reduced.
- the circuit scale of the thermal protection circuit TSD increases, the area of the space SP is increased.
- the connection region hse3 becomes smaller, the amount of heat conducted from the connection region hse3 to the temperature sensing element TE becomes weaker.
- the shortest distance y3 between the central portion Tc (point P4) of the temperature sensing element TE and the connection region hse3 is shorter than the shortest distances x31a and x31b between the central portion Tc and the opposing regions hse1 and hse2. To do. Further, the distance between the center portion Tc and the point P2 is made shorter than the distance between the center portion Tc and the point P1. Thereby, the relative heat conduction intensity between the connection region hse3 and the opposing regions hse1 and hse2 can be corrected.
- FIG. 4 shows another variation of FIG. 4 differs from FIGS. 2 and 3 in that the depth of the space SP, that is, the ratio of the length y1 to the length y0 is reduced.
- the ratio y1 / y0 is reduced, the area of the space part SP is reduced.
- the area of the connection region hse3 increases.
- the thermal protection circuit TSD becomes smaller, the area of the space part SP becomes smaller. However, if it is made smaller than necessary, the thermal protection circuit TSD cannot be sufficiently disposed in the space SP.
- the shortest distance y3 between the central portion Tc (point P4) of the temperature sensing element TE and the connection region hse3 is the shortest distance x31a between the central portion Tc and the opposing regions hse1 and hse2, regardless of the size of the space SP. , X31b. Further, the distance between the center portion Tc and the point P2 is made shorter than the distance between the center portion Tc and the point P1. This suppresses a decrease in the strength of heat conduction relative to the opposing regions hse1 and hse2 of the connection region hse3.
- FIG. 5 shows a heat distribution simulation result of the concave heat source element HSE and the space SP shown in FIGS.
- the concave heat source element HSE was divided into three parts. As shown in FIGS. 1 and 2, there are three division directions, ie, an opposing region hse10, hse20 and a connecting region hse30, along the direction X.
- the area Y may be divided into three areas, ie, two connected areas having a relatively small area and one opposing area having a relatively large area.
- the heat distribution simulation of the present invention is characterized in that the concave shape is divided into two opposing regions and one connecting region.
- CAE Computer Aided Engineering
- the semiconductor chip SCH is made of silicon, and the size thereof is, for example, in the range of 1.0 mm ⁇ 1.0 to 1.4 mm ⁇ 1.4 mm.
- the area of the heat source element HSE was 9% to 33% of the entire area of the semiconductor chip SCH.
- the lengths x10 and x20 of the opposing regions hse10 and hse20 are, for example, 250 ⁇ m, and the length y0 is 350 ⁇ m.
- the length x30 of the connection region hse30 is 110 ⁇ m, a distance of 15 ⁇ m in size (separation width) is taken between the connection region hse30 and the opposing regions hse10 and hse20, and the connection region hse30 and the connection region hse30.
- the opposing region hse20 are separated from each other, and the opposing regions hse10 and hse20 are also separated from each other.
- 5A to 5C are different in length y1 and length y2.
- the length y0 obtained by adding the length y1 and the length y2 is constant.
- the power consumption in the heat source element HSE was adjusted so that the maximum temperature of the semiconductor chip SCH was 250 ° C. Specifically, 30 W of power was applied to the heat source element HSE. Note that the maximum temperature of 250 ° C. is not allowed in this type of semiconductor device, but was performed as one of the simulations. Further, the power consumption of 30 W applied to the heat source element HSE also deviates from the normal use state. However, simulations performed under conditions greatly deviating from the normal use state are expected to predict an unexpected state and to be suitable for estimating a specific value of the actual heat distribution.
- FIG. 5A schematically shows a case where the length y1 and the length y2 are set to the same length.
- the area of the space part SP is substantially the same as that of the connection region hse30.
- the temperatures of the point P1 that is the center of the opposing regions hse10 and hse20 and the point P2 that is the center of the connecting region hse30 are both 250 ° C., and there is no difference between them.
- the temperature at a point P3 facing a temperature sensing element TE (not shown) in a part of the connection region hse30 is around 230 ° C.
- the temperature at a point P4 that is the center of the temperature sensing element TE is around 200 ° C. It was.
- the temperature at a point P5 corresponding to the end of the space SP the temperature was around 150 ° C. Therefore, the temperature difference between points P1, P2 and P5 having the highest temperature is about 100 ° C., and the temperature difference from end to end of the space SP is about 80 ° C. This means that when the thermal protection circuit TSD is disposed in the space SP, a temperature difference of approximately 80 ° C.
- the temperature difference of 80 ° C. is the magnitude when the temperature of the points P1 and P2 reaches 250 ° C. For example, if the allowable temperature of the points P1 and P2 is 150 ° C., the temperature difference of 80 ° C. is 50 Presumed to be around ° C.
- FIG. 5B schematically shows a case where the area of the space portion SP is made larger than that of FIG. 5A, and conversely, the area of the connection region hse30 is made smaller.
- the length y1 is 2/3 (67%) of the length y0
- the length y2 of the connection region hse30 is 1/3 (33%) of the length y0.
- the temperature distribution at the points P3 and P4 is not significantly different from that in FIG. 5A because the heat conduction from the opposing regions hse10 and hse20 and the connecting region hse30 is entangled with each other at these points. This is presumed to be because the dominating power of the opposing regions hse10 and hse20 is stronger than that of the connected region hse30.
- the temperature at the point P5 was around 140 ° C., and no significant difference was observed from that in FIG.
- FIG. 5C schematically shows a case where the area of the space SP is further increased than that of FIG. 5B, and conversely, the area of the connection region hse30 is reduced.
- the length y1 is 9/10 of the length y0
- the length y2 of the connection region hse30 is 1/10 of the length y0.
- the temperature of the central portion Tc of the thermosensitive element TE is different from the maximum temperature of 250 ° C. around 60 ° C., and it has been found that the temperature detection sensitivity is lower than that in FIGS. 5 (A) and 5 (B).
- the reason why the temperature detection sensitivity is lowered is that the area (volume) of the connection region hse30 is reduced and the thermal conductivity to the temperature sensing element TE is weakened, and the point P1 that is the center of the opposing regions hse10 and hse20 is felt. It is presumed that the distance to the temperature element TE is increasing.
- FIG. 6 shows the heat distribution simulation result of the concave heat source element HSE shown in FIGS. 1 to 4 as in FIG.
- the power applied to the entire heat source element HSE was viewed as 30 W, similar to that in FIG.
- the length x12 and the length x22 of the opposing regions hse12 and hse22 are both 330 ⁇ m, the length y0 is 350 ⁇ m, the length x32 of the connection region hse32 is 110 ⁇ m, and the connection region hse32 and A distance of 15 ⁇ m is provided between the opposing regions hse12 and hse22, the connecting region hse32 and the opposing region hse12 are separated from each other, the connecting region hse32 and the opposing region hse22 are separated from each other, and the opposing regions hse12 and hse22 are also separated from each other. It was configured as follows. Accordingly, in FIGS.
- the lengths x12 and x22 of the opposing regions hse12 and hse22 are three times the length x32 of the connection region hse32. This triple size is different from the almost double size shown in FIG.
- 6A to 6C have different lengths y1 and y2. 6A to 6C, as in FIG. 5, the length y0 obtained by adding the length y1 and the length y2 is constant.
- FIG. 6A shows a case where the area of the space SP is relatively small.
- the heat distribution simulation of the heat source element HSE and the space part SP was carried out under such a configuration, when the temperature at the point P1 was 250 ° C., the temperature at the point P2 was also 250 ° C. At this time, the point P3 was around 240 ° C., and the temperature of the point P4, which is the central portion Tc of the temperature sensitive element TE, was around 220 ° C. Further, the temperature of the point P5 is around 210 ° C., and there is a temperature difference of around 40 ° C. from the temperature of the point P1, and it has been found that there is a great difference from that of FIG.
- FIG. 6 (B) shows a case where the area of the space part SP is made larger than that of FIG. 6 (A).
- the temperature at the point P1 was 250 ° C.
- the temperature at the point P2 was also 250 ° C.
- the temperature at point P3 was around 240 ° C.
- that at point P4 was around 230 ° C. Therefore, the temperature at the point P4, which is the central portion Tc of the temperature sensitive element TE, is about 20 ° C. lower than the temperature at the point P1.
- the temperature of the point P5 was around 200 degreeC.
- the area of the space SP and the area of the connection region hse32 are set to be approximately equal.
- the distance from the point P1 to the point P4 that is, the distance from the center of the opposing regions hse12 and hse22 to the center of the temperature sensing element TE (point P4) is the shortest distance. This shortest distance is shorter than that shown in FIG. For this reason, since heat with the highest temperature is efficiently conducted to the temperature sensing element TE, it is estimated that a part of the space SP is kept at a high temperature.
- FIG. 6 (C) shows a case where the area of the space part SP is made larger than that of FIG. 6 (B).
- the temperature at the point P1 is 250 ° C.
- the temperature at the point P2 is around 240 ° C.
- the temperature of the point P3 and the point P4 was around 230 degreeC.
- the temperature difference at the point P4 which is the center portion Tc of the temperature sensitive element TE, was about 20 ° C. from the maximum temperature. Therefore, compared with FIG. 6B, the temperature difference between the maximum temperature of the heat source element HSE and the temperature detected by the temperature sensitive element TE is substantially the same.
- the structure of the heat source element HSE shown in FIG. 6 is obtained by dividing the concave shape into three parts, that is, two opposing regions and one connecting region, as shown in FIG.
- the third side 13 shown in FIG. 2 is extended until it contacts the sixth side 16 and the seventh side 17, so that three regions, that is, two opposing regions
- the simulation may be performed by dividing into one connected region. Even in such a configuration, the two opposing regions are arranged with the space SP interposed therebetween, and the connecting region is formed so as to connect these two opposing regions.
- FIG. 7 is a temperature gradient diagram showing the thermal distribution simulation result shown in FIG. 5 from another viewpoint.
- the horizontal axis in FIG. 7 indicates the points P1 to P5, and the vertical axis indicates the maximum temperature, that is, the temperature difference from the point P1.
- the point P1 indicates the center of the opposing areas hse10 and hse20.
- the point P1 was found to be around 250 ° C. regardless of the parameters.
- the point P3 corresponds to a part of one side of the connection area hse30. That is, it is a place where it can be estimated that the temperature becomes the highest in the space portion SP near the end of the depth of the space portion SP.
- the point P4 corresponds to the center portion Tc of the temperature sensing element TE.
- the point P4 is 30 ⁇ m to 60 ⁇ m away from the point P3, but is about 20 ° C. lower than the temperature of the point P3.
- the temperature difference at the point P4 was reduced compared to the point P3.
- the point P5 is the so-called frontage of the space SP, and it can be estimated that the temperature is the lowest in the space.
- y1 / y0 is in the range of 0.5 to 0.9 and the maximum temperature is around 110 ° C. There was a difference.
- the temperature difference at point P5 was reduced as compared with point P2.
- what can be said from the characteristics shown in FIG. 7 is that there was no significant difference in temperature at each point in the range of y1 / y0 in the range of 0.67 to 0.5.
- FIG. 8 is a temperature gradient diagram showing the thermal distribution simulation result shown in FIG. 6 from another viewpoint.
- the horizontal axis in FIG. 8 indicates points P1 to P5, and the vertical axis indicates the maximum temperature, that is, the temperature difference from the point P1.
- the depth of the space portion SP that is, the ratio y1 / y0 is shown.
- the point P1 indicates the center of the opposing areas hse12 and hse22.
- Point P1 had a temperature of about 250 ° C. regardless of the parameters.
- the characteristic shown in FIG. 8 has a smaller temperature difference than that shown in FIG. 7, and a favorable result was obtained.
- FIG. 8 shows that the temperature difference at each point is reduced as compared with FIG. 7, and the absolute value thereof is reduced to almost 1 ⁇ 2.
- the point P2 is the central part of the connection region hse32, but the temperature of the point P2 is almost the same regardless of the size of the ratio y1 / y0, and is almost the same as the maximum temperature of 250 ° C.
- the point P3 corresponds to a part of one side of the connection area hse32. That is, it is a place where it can be estimated that the temperature becomes the highest in the space portion SP near the end of the depth of the space portion SP.
- the temperature difference at the point P3 was almost the same regardless of the depth of the space SP, and was around 240 ° C.
- the point P4 corresponds to the center portion Tc of the temperature sensing element TE.
- the point P4 is 30 ⁇ m to 60 ⁇ m away from the point P3, but is about 10 ° C. lower than the temperature of the point P3.
- Point P5 hits the front of space SP, and it can be estimated that the temperature is the lowest in the space, but in the simulation results, it is about 50 ° C. lower than the maximum temperature in the range of 0.25 ⁇ y1 / y0 ⁇ 0.75. It was. However, the temperature difference at the point P5 is almost 1 ⁇ 2 compared to FIG. 7, and the temperature difference from the point P1 is greatly reduced.
- Fig. 8 The summary of Fig. 8 is as follows. That is, by making the area (volume) of the opposing regions hse12 and hse22 larger than that of the connection region hse32, the temperature gradient in the space SP is reduced, which is preferable for arranging the temperature sensitive element TE. It is.
- FIG. 9 is a temperature gradient diagram in which the temperature difference at point P4 shown in FIGS. 7 to 8, particularly the maximum temperature of 250 ° C., is plotted.
- the point P4 corresponds to the central portion Tc of the temperature sensing element TE and is a particularly important part for monitoring the temperature of the heat source element HSE. That is, the temperature detection sensitivity can be increased as the temperature at the point P4 is closer to the temperature at the point P1.
- Fig. 9 is plotted with two parameters.
- it is a comparison of the temperature detection sensitivity when the width of the opposing region is twice that of the connected region and three times that of the connected region.
- FIG. 9 shows a case where the widths of the opposing regions hse10, hse20, hse12, and hse22 are twice or three times as large as the connected regions hse30 and hse32.
- the same effect can be obtained even if the width of the opposing region and the width of the connecting region are the same, not only twice or three times.
- the heat conduction to the space SP is far from the center (point P1) of the opposing regions hse10 and hse20. It is not enough because it is far away.
- connection region hse30 increases as the area of the connection region hse30 increases and increases to some extent as shown in FIG.
- Such a state means that the connection region hse30 is dominant in the heat conduction to the space SP when the view is changed.
- the width of the connection region hse30 is 1 ⁇ 2 of the opposing regions hse10 and hse20. Accordingly, it can be understood that the same effect can be obtained even if the widths of the opposing regions hse10 and hse20 are the same as those of the connection region hse30.
- the heat source element HSE when the heat source element HSE is formed in a concave shape and the space portion SP having a predetermined size is provided, the heat source element HSE is divided into two opposed regions and one connected region and is divided into three regions. To do. Thereafter, predetermined power consumption is applied to the heat source element HSE, and the maximum temperature is monitored and managed to simulate the heat distribution and the thermal gradient of the heat source element HSE and the space SP. The simulation results are then analyzed. The analysis examines the maximum temperature of the heat source element HSE, the temperature distribution of the temperature sensitive element TE, the heat distribution of the space SP and the thermal gradient.
- the semiconductor device 10 suitable for exhibiting the area required for the heat source element HSE and the function of the thermal protection circuit TSD may be designed.
- FIG. 10 is a simulation diagram showing the relationship between power consumption and temperature detection sensitivity in the heat source element HSE. That is, a heat distribution simulation result showing a temperature difference between the point P1 and the point P4, that is, the center portion Tc of the temperature sensitive element TE when the power consumption in the heat source element HSE is changed is shown.
- the horizontal widths x10 and x20 of the opposing regions hse10 and hse20 are twice the horizontal width x30 of the connecting region 30, and the horizontal widths of the opposing regions hse12 and hse22 as shown in FIG.
- FIGS. 5 to 9 described so far are cases where the power consumption of the heat source element HSE is 30 W.
- FIG. FIG. 10 is a characteristic diagram obtained from the heat distribution simulation result when the power consumption is 30 W and the power consumption is 60 W.
- the horizontal axis indicates the power consumption and the vertical axis indicates the temperature difference.
- the heat distribution simulation result shown in FIG. 10 is extremely useful in designing and manufacturing this type of semiconductor device and semiconductor integrated circuit device. This is because the temperature detection sensitivity of the temperature sensing element TE for a wide range of power consumption consumed by the heat source element HSE can be analogized.
- the temperature detection sensitivity of the temperature sensing element TE when the power consumption of the heat source element HSE is 5 W can be estimated. It can be seen that the temperature difference is about 8 ° C. when the width of the opposing region is twice that of the connected region, and is about 4 ° C. when the width ratio is three times. Therefore, it can be seen that when the power consumption of the heat source element HSE is 5 W, the detection sensitivity of the temperature sensitive element TE is 10 ° C. or less. Moreover, when power consumption is 10 W, it turns out that it is around 16 degreeC and around 8 degreeC, respectively.
- the characteristic diagram shown in FIG. 10 shows the thermal conductivity [W / m ⁇ ° C.] and density [kg / m 3 ] of so-called constituent materials such as lead frames, die bonding materials, wires, and resins on which the semiconductor device 10 is mounted.
- constituent materials such as lead frames, die bonding materials, wires, and resins on which the semiconductor device 10 is mounted.
- J / kg ⁇ ° C.] etc. if several combinations are prepared in advance, the design period of the semiconductor device 10 can be shortened and the product quality can be improved.
- FIG. 11 shows an area ratio between the area of the heat source element HSE and that of the space SP.
- FIG. 3 is a diagram obtained by using the size of the frontage (length x3) and depth (length y1) and the widths (lengths x1 and x2) of the opposing areas hse1 and hse2 described in FIG. 2 as parameters.
- FIG. 5A applies to this case.
- FIG. 6B applies to this case.
- the area of the space SP is 1/3 of the area of the heat source element HSE.
- the area ratio is 33.3%.
- the ratio of the area of the space SP to the heat source element HSE is often in the range of 3.7% to 33.3% shown in FIG. That is, assuming that the areas of the heat source element HSE and the space SP in the plan view are S1 and S2, respectively, S2 is approximately in the range of 0.037 ⁇ S1 to 0.333 ⁇ S1.
- FIG. 12 shows an example of a specific circuit configuration of the thermal protection circuit TSD arranged in the space SP.
- the thermal protection circuit TSD is well known in the past.
- the thermal protection circuit TSD includes, for example, constant current sources CC1 and CC2, resistors R1 and R2, a transistor Q, a comparator COM, and an inverter INV in addition to the temperature sensing element TE.
- the temperature sensing element TE for example, a diode-connected transistor is used.
- the temperature sensing element TE is, for example, a diode
- the forward voltage of the diode has a temperature coefficient of, for example, ⁇ 2 mV with respect to the temperature change.
- the temperature of the heat source element HSE can be detected.
- the thermal protection circuit TSD is turned on / off by the TSD on / off signal output from the comparator COM.
- a semiconductor diffusion resistance, a polysilicon resistance, or the like can be used as the temperature sensing element TE.
- the thermal protection circuit TSD shown in FIG. 12 is an example, and the circuit configuration may be further complicated and the degree of integration may be increased, or the circuit configuration may be further simplified.
- the size of the opening and the depth of the space SP may be set according to the circuit configuration and the number of circuit elements.
- the semiconductor device and the design method thereof according to the present invention can detect a temperature close to the temperature of the heat source element based on the heat distribution simulation with the temperature sensitive element, the semiconductor device using the power transistor, the thermal monitoring of the semiconductor integrated circuit device, Since it is extremely suitable for thermal management, its industrial applicability is very high.
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Abstract
Description
11 第1辺
12 第2辺
13 第3辺
14 第4辺
15 第5辺
16 第6辺
17 第7辺
18 第8辺
CC1,CC2 定電流源
COM コンパレータ
HSE 熱源素子
hse1,hse2,hse10,hse12,hse20,hse22 対向領域
hse3,hse30,hse32 連結領域
OC その他回路
P1~P5 ポイント
Q トランジスタ
SCH 半導体チップ
SP 空間部
TE 感温素子
TSD 熱保護回路
Claims (11)
- 熱源素子と感温素子を備えた半導体装置であって、前記熱源素子の平面視形状は、第1の距離x1を有する第1辺と、前記第1辺と同一線上に第2の距離x3離れ前記第1辺から遠ざかる方向に第3の距離x2延びる第2辺と、前記第1辺および前記第2辺の垂直方向に第4の距離y1離れ前記第2の距離x3と同じ長さを有する第3辺と、前記第1辺の一端と前記第3辺の一端を結ぶ第4辺と、前記第2辺の一端と前記第3辺の他端を結ぶ第5辺と、前記第1辺の他端にその一端が接続され前記第4辺が延びる方向と同じであってかつそれよりも長さが長く長さy0で示される第6辺と、前記第2辺の他端に接続されその一端が前記第5辺が延びる方向と同じであってかつそれよりも長い長さy0で示される第7辺と、前記第6辺および前記第7辺の他端同士を結ぶ第8辺を備えており、前記第8辺は長さx0を有しており、前記感温素子は前記第3辺の近傍に配置されていることを特徴する半導体装置。
- 前記感温素子の中心部は前記第4辺および第5辺よりも前記第3辺の近傍に配置されていることを特徴とする請求項1に記載の半導体装置。
- 前記第4の距離y1と前記長さy0との間は、0.25≦y1/y0≦0.75であることを特徴とする請求項1または2に記載の半導体装置。
- 前記第4の距離y1はほぼ、y1/y0=0.5であることを特徴とする請求項3に記載の半導体装置。
- 前記第1の距離x1と前記第3の距離x2はほぼ、x3≦x1=x2≦3×x3であることを特徴とする請求項3に記載の半導体装置。
- 前記熱源素子および前記感温素子は、前記第1辺,第2辺,第3辺,第4辺および前記第5辺で画定された空間部に配置され、前記熱源素子の平面視上の面積をS1とし、前記空間部の面積をS2としたときに、0.037×S1≦S2≦0.333×S1であることを特徴する請求項1~5のいずれか1項に記載の半導体装置。
- 前記感温素子は熱保護回路の一部を成し、前記熱保護回路は前記感温素子および基準電圧回路に定電流を供給する定電流源と前記基準電圧回路の基準電圧と前記感温素子に生じた電圧を比較するコンパレータを有し、前記熱保護回路は前記空間部に配置されていることを特徴とする請求項6に記載の半導体装置。
- 半導体チップ内に熱源素子と感温素子を有する半導体装置であって、前記熱源素子は空間部を挟む2つの対向領域と、前記2つの対向領域をつなぐ連結領域を備えて凹字状を成し、前記感温素子は前記連結領域の近傍の前記空間部に配置されていることを特徴とする半導体装置。
- 前記感温素子の中心部と前記連結領域の中心部との間の距離は、前記感温素子の中心部と前記対向領域の1つの領域の中心部との間の距離よりも短いことを特徴とする請求項8に記載の半導体装置。
- 請求項8~9のいずれか1項に記載の半導体装置を設計するにあたり、前記凹字状の熱源素子を3つの領域に分割すると共にそれら分割した領域および前記空間部の大きさ、形状を決定する第1ステップと、前記第1ステップで決定した前記熱源素子および前記空間部の熱分布シミュレーションを実行する第2ステップと、前記第2ステップで実行したシミュレーション結果を分析する第3ステップと、前記第3ステップで得られたシミュレーション結果に基づき前記3つの領域と前記空間部の大きさを決定する第4ステップを有することを特徴とする半導体装置の設計方法。
- 前記3つの領域の2つは前記対向領域であり、前記3つの領域の1つは前記連結領域であることを特徴とする請求項10に記載の半導体装置の設計方法。
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KR1020167016963A KR20160089497A (ko) | 2013-12-26 | 2014-11-20 | 반도체 장치 및 그 설계 방법 |
EP14873664.8A EP3089206B1 (en) | 2013-12-26 | 2014-11-20 | Semiconductor device, and design method for same |
US15/107,989 US20160329315A1 (en) | 2013-12-26 | 2014-11-20 | Semiconductor device and method for designing it |
KR1020187004288A KR20180018860A (ko) | 2013-12-26 | 2014-11-20 | 반도체 장치 및 그 설계 방법 |
CN201480070363.0A CN105849889B (zh) | 2013-12-26 | 2014-11-20 | 半导体装置及其设计方法 |
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- 2014-11-20 WO PCT/JP2014/080706 patent/WO2015098379A1/ja active Application Filing
- 2014-11-20 KR KR1020167016963A patent/KR20160089497A/ko active Application Filing
- 2014-11-20 KR KR1020187004288A patent/KR20180018860A/ko not_active Application Discontinuation
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CN105849889A (zh) | 2016-08-10 |
KR20160089497A (ko) | 2016-07-27 |
EP3089206A1 (en) | 2016-11-02 |
KR20180018860A (ko) | 2018-02-21 |
US20160329315A1 (en) | 2016-11-10 |
EP3089206A4 (en) | 2017-08-23 |
JP6345930B2 (ja) | 2018-06-20 |
EP3089206B1 (en) | 2019-04-17 |
CN105849889B (zh) | 2019-03-01 |
JP2015126113A (ja) | 2015-07-06 |
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