Patent Description:
With development of communication technologies, there are increasing requirements for a power supply circuit that supplies power to a communication apparatus. To implement power conversion with high efficiency, a printed circuit board (printed circuit board, PCB) of the power supply circuit includes a large quantity of electronic components. However, a use environment of the power supply circuit is increasingly severe. For example, the power supply circuit is required to occupy a smaller board area, but have stronger anti-corrosion and anti-radiation capabilities. To reduce the board area occupied by the power supply circuit, in other words, to reduce an area of the PCB, as shown in <FIG>, various electronic components <NUM> are generally packaged on a front and a back of a package substrate <NUM> separately, and then are mounted on the PCB (not shown in <FIG>). In <FIG>, electronic components located on the front of the package substrate <NUM> are already plastically packaged by a plastic packaging material <NUM>. However, such a packaging manner causes a height difference between different conductive connection pads (pads) on the back of the package substrate <NUM>. For example, a height difference exists between a conductive connection pad <NUM> on the package substrate <NUM> and a conductive connection pad <NUM> on the electronic component <NUM>.

To resolve a problem of the height difference between different conductive connection pads, as shown in <FIG>, a solder ball (solder ball) <NUM> is usually disposed on the conductive connection pad <NUM> of the package substrate <NUM>. However, because the solder ball <NUM> is in a liquid state during high-temperature reflow (reflow) soldering, a maximum height is low due to tension, and generally does not exceed <NUM>. As a result, the problem of the large height difference cannot be resolved.

United States patent application <CIT> describes a semiconductor package including a frame having first and second surfaces opposite to each other, having first and second through holes, and including a wiring structure connecting the first and second surfaces, a connection structure disposed on the first surface of the frame and having a redistribution layer connected to the wiring structure.

United States patent application <CIT> describes an integrated circuit chip carrier including one or more memory devices.

United States patent application <CIT> describes a conductive structure including a core portion, a plurality of electronic devices and a filling material, wherein the core portion defines a cavity, the electronic devices are disposed in the cavity of the core portion and the filling material is disposed between the electronic devices and a sidewall of the cavity of the core portion.

United States patent application <CIT> describes a semiconductor package including a first package with one or more dies and a redistribution layer coupled to the one or more dies at a first side of the first package with a first set of bonding joints.

United States patent application <CIT> describes a semiconductor package including a redistribution layer and a semiconductor chip provided on the redistribution layer having a first surface and a second surface opposite to the first surface.

This application provides a package structure and a preparation method thereof, a package module, and an electronic device, to resolve a problem of a height difference between different conductive connection pads on a package substrate.

According to a first aspect, this application provides a package structure. The package structure is mounted on a back of a package substrate, and is then mounted on a circuit board. The package structure includes a frame plate, a first electronic component, a filling material, and a plurality of conductive connection pads. The frame plate may be made of any dielectric material suitable for forming the frame plate. This is not limited herein. The frame plate has a first surface and a second surface that are opposite and parallel to each other, the frame plate includes a through hole, and the frame plate has a hollowed-out region. A quantity of the hollowed-out region and a quantity of the through hole are not limited in this application, and may be specifically designed based on an actual product. Both the filling material and the first electronic component are located in the hollowed-out region, and the first electronic component is fastened in the hollowed-out region by using the filling material. In other words, the first electronic component and the frame plate are packaged together by using the filling material. A quantity of the first electronic component in the hollowed-out region is not limited in this application, and may be specifically designed based on an actual product. The plurality of conductive connection pads may include: a first conductive connection pad located on the first surface and electrically connected to the through hole, a second conductive connection pad located on the second surface and electrically connected to the through hole, and a third conductive connection pad located on the first surface and electrically connected to the first electronic component, and a fourth conductive connection pad located on the second surface and electrically connected to the first electronic component. A quantity of the third conductive connection pad and a quantity of the fourth conductive connection pad are not limited in this application, and are specifically determined based on a structure of the first electronic component.

In this application, both the first conductive connection pad and the third conductive connection pad are located on the first surface, and both the second conductive connection pad and the fourth conductive connection pad are located on the second surface. In this way, on one side of the first surface, a surface of the third conductive connection pad and a surface of the first conductive connection pad may be caused to be in a same plane, so that a height of the conductive connection pad of the first electronic component, that is, the third conductive connection pad, is consistent with a height of the first conductive connection pad. On one side of the second surface, a surface of the fourth conductive connection pad and a surface of the second conductive connection pad may be in a same plane, so that a height of the conductive connection pad of the first electronic component, that is, the fourth conductive connection pad, is consistent with a height of the second conductive connection pad.

In actual application, generally, an electronic component is plastically packaged on a front of the package substrate, and a conductive connection pad of the electronic component on the front of the package substrate is led out through a conductive connection pad disposed on the back of the package substrate. When the package structure provided in this embodiment of this application is mounted on the back of the package substrate, the first electronic component in the package substrate may be packaged on the back of the package substrate, and the through hole in the package structure may also be used to lead out the conductive connection pad on the back of the package substrate, to resolve a problem of a height difference between the conductive connection pad on the back of the package substrate and the conductive connection pad of the first electronic component. In addition, because both the through hole and the first electronic component are packaged in the frame plate, that is, the package structure is a structure in which the through hole and the first electronic component are formed into a same module, the conductive connection pads electrically connected to the through hole and the conductive connection pads electrically connected to the first electronic component may be formed on a same surface. In this way, a height difference between the conductive connection pads located on the same surface may be controlled to be within <NUM>, to reduce a risk of mounting the package structure and the circuit board. In addition, in this application, both the through hole and the first electronic component are packaged in the frame plate, and a thickness of the frame plate may be designed based on a height of the first electronic component. Therefore, a problem of a large height difference between the conductive connection pad on the package substrate and the conductive connection pad on the electronic component can be resolved. In addition, in this application, a plurality of first electronic components may be packaged in the package structure and may be mounted on the back of the package substrate through one mounting process, so that a quantity of times of mounting can be reduced, to improve production efficiency and reduce product processing costs. In addition, the package structure provided in this embodiment of this application may be compatible with a conventional device and a conventional manufacturing process, the manufacturing process is simple, and a yield rate is high.

It should be noted that, in this embodiment of this application, the concept of "being in a same plane" does not mean being in a same plane in a strict sense. In a process of preparing the package structure, due to impact of a preparation process and a preparation device, there may be a case in which the surfaces are not strictly in a same plane. This case is caused by a specific preparation procedure, and it cannot be indicated that the case in which the surfaces are not strictly in the same plane goes beyond the protection scope of this application. In addition, a similar understanding is also provided for a location relationship of "parallel", and details are not described herein again.

During specific implementation, in this application, for surfaces that are of different conductive connection pads and that are in a same plane, a height difference within a range of <NUM> is allowed.

For example, the first electronic component may be a component such as an integrated chip, a switch element, a resistor, a capacitor, or a magnetic core. The integrated chip may be a voltage conversion chip, a transformer chip, or the like. This is not limited herein.

During specific implementation, the thickness of the frame plate may be designed based on the height of the first electronic component. In this application, heights of the first electronic components located in the hollowed-out region are basically the same.

For example, in the package structure provided in this application, the package structure provided in this application further includes a second electronic component. The plurality of conductive connection pads further include a fifth conductive connection pad located on the first surface and connected to the second electronic component. The second electronic component is fastened in the hollowed-out region by using the filling material. That is, a gap that exists after the first electronic component and the second electronic component are placed in the hollowed-out region is filled with the filling material. In this application, the first electronic component and the second electronic component are packaged in a same package structure. In this way, the first electronic component and the second electronic component may be mounted on the back of the package substrate through one mounting process, so that the quantity of times of mounting can be reduced, to improve the production efficiency and reduce the product processing costs.

For example, the second electronic component may be a component such as an integrated chip, a switch element, a resistor, a capacitor, or a magnetic core. The integrated chip may be a voltage conversion chip, a transformer chip, or the like. This is not limited herein.

It should be noted that, in this application, a main difference between the first electronic component and the second electronic component lies in that both sides of the first electronic component have a conductive connection pad, and only one side of the second electronic component has the conductive connection pad. For example, in actual application, the first electronic component needs to be electrically connected to both the package substrate and a PCB, and in actual application, the second electronic component only needs to be electrically connected to the package substrate or the PCB. During specific implementation, a height of the second electronic component is generally less than or equal to the height of the first electronic component. The conductive connection pad is disposed on one side that is of the second electronic component and that is close to the first surface, and on one side of the second surface, the filling material covers the second electronic component.

During specific implementation, to implement electrical connection between the conductive connection pads on both sides of the through hole, the through hole may be filled with the conductive material. However, when the thickness of the frame plate is thick, a process of fully filling the through hole with a conductive material is difficult. For example, the conductive material may be formed on a side wall of the through hole, and then a region defined by the conductive material is filled with a resin material.

For example, the conductive material may be a metal material, for example, gold, silver, aluminum, zinc, copper, chromium, nickel, or palladium. The resin material may be a material such as epoxy resin. This is not limited herein.

The frame plate includes at least two dielectric material plates disposed in a stacked manner. Each one of the dielectric material plates has vias, and one through hole may include one via in each dielectric material plate. A routing layer is further disposed between any two adjacent dielectric material plates, and vias in the any two adjacent dielectric material plates are electrically connected through the routing layer. That is, locations of vias belonging to a same through hole may be different, and different vias are electrically connected through the routing layer. In this way, the package structure may have a possibility of re-routing, so that locations of the first conductive connection pad and the second conductive connection pad may be flexibly set, to reduce a trace pressure of the package substrate.

The routing layer includes at least one conductive layer and an insulation medium layer, and a circuit trace is disposed on the conductive layer. When the routing layer includes two or more conductive layers, the insulation medium layer is provided with a medium through hole to connect circuit traces on different conductive layers.

Optionally, in the package structure, a metal trace may be disposed on a side wall of the hollowed-out region of the frame plate, and the metal trace may extend from one side of the first surface to one side of the second surface through the side wall of the hollowed-out region. The plurality of conductive connection pads may further include: a sixth conductive connection pad located on the first surface and electrically connected to the metal trace, and a seventh conductive connection pad located on the second surface and electrically connected to the metal trace. That is, the metal trace is used to replace the through hole, so that the quantity of the through hole in the package structure can be reduced.

A quantity of the metal trace is not limited in this application, and is specifically designed based on an actual product. When there are a plurality of metal traces, the metal traces may be disposed at intervals, to ensure that different metal traces are insulated from each other.

For example, the metal trace may be made of a material such as gold, silver, aluminum, zinc, copper, chromium, nickel, or palladium. This is not limited herein.

Optionally, in this application, the package structure may further include an interconnection line layer. The interconnection line layer is located on the second surface of the frame plate. Both the second conductive connection pad and the fourth conductive connection pad are located on the interconnection line layer. The second conductive connection pad is electrically connected to the through hole through the interconnection line layer, and the fourth conductive connection pad is electrically connected to the first electronic component through the interconnection line layer. In this way, the interconnection line layer is used, so that locations of the second conductive connection pad and the fourth conductive connection pad may be re-arranged.

According to a second aspect, this application further provides a package module, including a package substrate and a package structure according to the first aspect or the implementations of the first aspect that is mounted on the package substrate.

During specific implementation, the package substrate may be any structure on which a line is disposed, such as a re-routing layer, a substrate, or a silicon interposer. This is not limited herein.

For example, the package structure may be mounted on the package substrate by using technologies such as surface mounting.

In an embodiment, the package structure may be mounted on a back of the package substrate, an electronic component is generally disposed on a front of the package substrate, and a conductive connection pad of the electronic component on the front of the package substrate is led out through a conductive connection pad disposed on the back of the package substrate.

Certainly, during specific implementation, the package structure may alternatively be mounted on the front of the package substrate, or both sides of the package structure are provided with the package substrate. This is not limited herein, and may be designed according to an actual requirement.

Further, in this application, when the package structure is mounted on the package substrate, one side of a first surface of a frame plate in the package structure may be disposed facing the package substrate, or one side of a second surface of the frame plate in the package structure may be disposed facing the package substrate. This is not limited herein, and may be designed according to an actual requirement.

For example, in this application, when the package structure is mounted on the back of the package substrate, one side of the first surface of the frame plate in the package structure may be disposed facing the package substrate. In this way, the package structure may not only package a first electronic component on the back of the package substrate, but may also use a through hole in the package structure to lead out the conductive connection pad on the back of the package substrate, to resolve a problem of a height difference between the conductive connection pad on the back of the package substrate and a conductive connection pad of the first electronic component.

According to a third aspect, this application further provides an electronic device, including a housing, a circuit board located in the housing, and the package module according to the implementations of the second aspect. The package module is located on the circuit board, and the package module is electrically connected to the circuit board. For example, the circuit board is a PCB. A problem-resolving principle of the electronic device is similar to that of the foregoing package module. Therefore, for the implementation of the electronic device, refer to the implementation of the foregoing package module, and details are not described again.

According to a fourth aspect, this application further provides a preparation method of a package structure. The method includes the following steps: step S101: forming a first conductive connection pad on a first surface of a frame plate; step S102: forming a through hole in a region that is of the frame plate and that corresponds to the first conductive connection pad; step S103: forming a hollowed-out region in the frame plate; step S104: causing the first surface of the frame plate to face downward, placing a first electronic component in the hollowed-out region, where the first electronic component has a third conductive connection pad, and causing a surface of the third conductive connection pad and a surface of the first conductive connection pad to be in a same plane; step S105: filling a gap of the hollowed-out region with a filling material; step S106: grinding a second surface of the frame plate, where the second surface is opposite and parallel to the first surface; and step S107: forming, on the second surface, a fourth conductive connection pad electrically connected to the first electronic component, and a second conductive connection pad electrically connected to the through hole.

In this application, each electronic component is packaged in the hollowed-out region of the frame plate, and when the electronic component is placed in the hollowed-out region, a conductive connection pad that is of the electronic component and that is located on one side of the first surface and the first conductive connection pad connected to the through hole are in a same plane. In addition, after each electronic component is packaged in the hollowed-out region of the frame plate, the second surface of the frame plate is ground, so that the conductive connection pad connected to the electronic component and the second conductive connection pad connected to the through hole are formed on the same plane of the frame plate. Therefore, a height difference between the conductive connection pads that are of the package structure and that are in the same plane is controlled to be within <NUM>.

Optionally, before the placing a first electronic component in the hollowed-out region, the method may further include: placing the frame plate on which the first conductive connection pad and the through hole are formed on a peelable mask; and peeling off the peelable mask after the fourth conductive connection pad electrically connected to the first electronic component and the second conductive connection pad electrically connected to the through hole are formed on the second surface.

For example, a material of the peelable mask is an ultraviolet photoinduced peelable mask, and the peelable mask may be peeled off through exposure to ultraviolet light.

For example, the forming a through hole in a region that is of the frame plate and that corresponds to the first conductive connection pad may include: making a hole in the region that is of the frame plate and that corresponds to the first conductive connection pad; plating a side wall of the hole with a conductive material; and filling, with a resin material, the hole plated with the conductive material.

Optionally, the frame plate may include a first dielectric material plate, a second dielectric material plate, and a routing layer. The forming a first conductive connection pad on a first surface of a frame plate, and the forming a through hole in a region that is of the frame plate and that corresponds to the first conductive connection pad include: forming the first conductive connection pad on a surface of one side of the first dielectric material plate; forming a first via in a region that is of the first dielectric material plate and that corresponds to the first conductive connection pad; forming the routing layer on one side that is of the first dielectric material plate and that is away from the first conductive connection pad, where the routing layer is electrically connected to the first via of the first dielectric material plate; forming the second dielectric material plate on one side that is of the routing layer and that is away from the first dielectric material plate; and forming a second via in the second dielectric material plate, where the routing layer is electrically connected to the second via of the second dielectric material plate.

For example, after the forming a hollowed-out region in the frame plate, and before the filling a gap of the hollowed-out region with a filling material, the method further includes: placing a second electronic component in the hollowed-out region, where the second electronic component has a fifth conductive connection pad, and causing a surface of the fifth conductive connection pad of the second electronic component and a surface of the first conductive connection pad to be in a same plane.

Optionally, in this application, when the first conductive connection pad is formed on the first surface of the frame plate, the method may further include: forming a sixth conductive connection pad on the first surface of the frame plate; after the forming a hollowed-out region in the frame plate, and before the placing a first electronic component in the hollowed-out region, the method further includes: forming a metal trace on a side wall of the hollowed-out region, where the metal trace is electrically connected to the sixth conductive connection pad; and when the fourth conductive connection pad electrically connected to the first electronic component, and the second conductive connection pad electrically connected to the through hole are formed on the second surface, the method further includes: forming, on the second surface, a seventh conductive connection pad electrically connected to the metal trace. That is, the metal trace is used to replace the through hole, so that the quantity of the through hole in the package structure can be reduced. For example, the metal trace may be formed through electroplating. This is not limited herein.

For technical effect that can be achieved in the second aspect to the fourth aspect, refer to the descriptions of technical effect that can be achieved by any possible design in the foregoing first aspect.

To make objectives, technical solutions, and advantages of this application clearer, the following further describes this application in detail with reference to the accompanying drawings.

Terms used in the following embodiments are merely intended to describe specific embodiments, but are not intended to limit this application. As used in this specification and appended claims of this application, singular expressions "one", "a", "the ", "the foregoing", "this", and "the one" are intended to also include expressions such as "one or more", unless the contrary is clearly indicated in the context.

In descriptions of this application, it should be noted that an orientation or a location relationship indicated by the terms "middle", "above", "below", "left", "right", "vertical", "horizontal", "inner", "outer", and the like is an orientation or a location relationship based on the accompanying drawings, and is merely intended for ease of describing this application and simplifying descriptions, but does not indicate or imply that a specified apparatus or element needs to have a specific orientation or needs to be constructed and operated in a specific orientation. Therefore, such terms cannot be understood as a limitation on this application. Expressions of locations and directions described in this application are all described by using the accompanying drawings as an example. However, changes may also be made as required, and all the changes fall within the protection scope of the present invention. The accompanying drawings in this application are merely used to illustrate relative location relationships and do not represent an actual scale. In addition, terms "first" and "second" are merely used for a purpose of description, and cannot be understood as an indication or implication of relative importance.

In descriptions of this application, it should be noted that unless otherwise expressly specified and limited, terms "mount", "connected", and "connection" should be understood in a broad sense. For example, such terms may indicate a fixed connection, a detachable connection, or an integrated connection; may indicate a mechanical connection or an electrical connection; or may indicate a direct connection, an indirect connection through an intermediate medium, or an internal connection between two elements. A person of ordinary skill in the art may understand specific meanings of the foregoing terms in this application based on specific cases.

For ease of understanding a package structure provided in embodiments of this application, an application scenario of the package structure is described first. The package structure provided in embodiments of this application may be used in various electronic devices, for example, may be used in a power supply circuit, a microprocessor (micro controller unit, MCU), a central processing unit (central processing unit, CPU), a graphics processing unit (graphics processing unit, GPU), a baseband (baseband) chip, or a system on chip (system on chip, SoC). It should be noted that the package structure provided in embodiments of this application is intended to include but not limited to application to these electronic devices and any other electronic device of a proper type. For example, a power supply circuit is used as an example. As shown in <FIG>, an electronic device includes a housing <NUM> and a circuit board <NUM> disposed in the housing <NUM>. A package module <NUM> is disposed on the circuit board <NUM>. The package module <NUM> includes a package substrate <NUM> and electronic components (not shown in the figure) located on both sides of the package substrate <NUM>. To reduce a risk of mounting the package module <NUM> on the board, an electronic component located between the package substrate and the circuit board may be first packaged on the package structure <NUM> and then mounted on the package substrate <NUM>. The following further describes in detail this application with reference to the accompanying drawings.

<FIG> is an example of a schematic diagram of a cross-sectional structure of a package structure <NUM> according to an embodiment of this application. Refer to <FIG>. The package structure <NUM> includes a frame plate <NUM>, a first electronic component <NUM>, a filling material <NUM>, and a plurality of conductive connection pads. The frame plate <NUM> may be made of any dielectric material suitable for forming the frame plate. This is not limited herein. The frame plate <NUM> has a first surface 110a and a second surface 110b that are opposite and parallel to each other, the frame plate <NUM> includes a through hole V1, and the frame plate <NUM> has a hollowed-out region V2. A quantity of the hollowed-out region and a quantity of the through hole are not limited in this application, and may be specifically designed based on an actual product. In <FIG>, one hollowed-out region and four through holes are used as an example for illustration.

Still refer to <FIG>. Both the filling material <NUM> and the first electronic component <NUM> are located in the hollowed-out region V2. The first electronic component <NUM> is fastened in the hollowed-out region V2 by using the filling material <NUM>. In other words, the first electronic component <NUM> and the frame plate <NUM> are packaged together by using the filling material <NUM>. A quantity of the first electronic component <NUM> in the hollowed-out region V2 is not limited in this application, and may be specifically designed based on an actual product. In <FIG>, an example in which one first electronic component <NUM> is disposed in the hollowed-out region is used for illustration.

Still refer to <FIG>. The plurality of conductive connection pads include: a first conductive connection pad <NUM> located on the first surface 110a and electrically connected to the through hole V1, a second conductive connection pad <NUM> located on the second surface 110b and electrically connected to the through hole V1, a third conductive connection pad <NUM> located on the first surface 110a and electrically connected to the first electronic component <NUM>, and a fourth conductive connection pad <NUM> located on the second surface 110b and electrically connected to the first electronic component <NUM>. The first electronic component <NUM> may be electrically connected to the outside through the third conductive connection pad <NUM>; or the first electronic component <NUM> may be electrically connected to the outside through the fourth conductive connection pad <NUM>; or the first electronic component <NUM> may be electrically connected to the outside through the third conductive connection pad <NUM> and the fourth conductive connection pad <NUM>. A quantity of the third conductive connection pad <NUM> and a quantity of the fourth conductive connection pad <NUM> are not limited in this application, and are specifically determined based on a structure of the first electronic component <NUM>.

In this application, both the first conductive connection pad <NUM> and the third conductive connection pad <NUM> are located on the first surface 110a, and both the second conductive connection pad <NUM> and the fourth conductive connection pad <NUM> are located on the second surface 110b. In this way, on one side of the first surface 110a, a surface of the third conductive connection pad <NUM> and a surface of the first conductive connection pad <NUM> may be in a same plane, so that a height of the conductive connection pad of the first electronic component <NUM>, namely, the third conductive connection pad <NUM>, is consistent with a height of the first conductive connection pad <NUM>. On one side of the second surface 110b, a surface of the fourth conductive connection pad <NUM> and a surface of the second conductive connection pad <NUM> may be in a same plane, so that a height of the conductive connection pad of the first electronic component <NUM>, namely, the fourth conductive connection pad <NUM>, is consistent with a height of the second conductive connection pad <NUM>.

<FIG> is a schematic diagram of a structure of an application scenario of a package structure according to an embodiment of this application. As shown in <FIG>, a package structure <NUM> provided in an embodiment of this application is mounted on a back of a package substrate <NUM>, and then is mounted on a circuit board <NUM>. In actual application, generally, an electronic component <NUM> is plastically packaged on a front of the package substrate <NUM>, and a conductive connection pad (not shown in the figure) of the electronic component <NUM> on the front of the package substrate <NUM> is led out through a conductive connection pad <NUM> disposed on the back of the package substrate <NUM>. When the package structure <NUM> provided in this embodiment of this application is mounted on the back of the package substrate <NUM>, the first electronic component <NUM> in the package substrate <NUM> may be packaged on the back of the package substrate <NUM>, and a through hole in the package structure <NUM> may also be used to lead out the conductive connection pad on the back of the package substrate <NUM>, to resolve a problem of a height difference between the conductive connection pad on the back of the package substrate <NUM> and the conductive connection pad of the first electronic component <NUM>. In addition, because both the through hole and the first electronic component <NUM> are packaged in a frame plate <NUM>, in other words, the package structure <NUM> is a structure in which the through hole and the first electronic component <NUM> are formed into a same module, the conductive connection pad electrically connected to the through hole and the conductive connection pad electrically connected to the first electronic component <NUM> may be formed on a same surface. In this way, a height difference between the conductive connection pads located on the same surface may be controlled to be within <NUM>, to reduce a risk of mounting the package structure <NUM> and the circuit board <NUM>. In addition, in this application, both the through hole and the first electronic component are packaged in the frame plate, and a thickness of the frame plate may be designed based on a height of the first electronic component. Therefore, a problem of a large height difference between the conductive connection pad on the package substrate and the conductive connection pad on the electronic component can be resolved. In addition, in this application, a plurality of first electronic components <NUM> may be packaged in the package structure <NUM> and may be mounted on the back of the package substrate <NUM> through one mounting process, so that a quantity of times of mounting can be reduced, to improve production efficiency and reduce product processing costs. In addition, the package structure <NUM> provided in this embodiment of this application may be compatible with a conventional device and a conventional manufacturing process, the manufacturing process is simple, and a yield rate is high.

For example, the first electronic component <NUM> may be a component such as an integrated chip, a switch element, a resistor, a capacitor, or a magnetic core. The integrated chip may be a voltage conversion chip, a transformer chip, or the like. This is not limited herein.

During specific implementation, a thickness L1 of the frame plate <NUM> may be designed based on the height H1 of the first electronic component <NUM>. In this application, heights of first electronic components <NUM> located in the hollowed-out region are basically the same.

For example, <FIG> is a schematic diagram of a cross-sectional structure of another package structure according to an embodiment of this application. As shown in <FIG>, a package structure <NUM> provided in this application further includes a second electronic component <NUM>. A plurality of conductive connection pads further include a fifth conductive connection pad <NUM> located on a first surface 110a and connected to the second electronic component <NUM>. The second electronic component <NUM> is fastened in a hollowed-out region V2 by using a filling material <NUM>. In other words, a gap that exists after a first electronic component <NUM> and the second electronic component <NUM> are placed in the hollowed-out region is filled with the filling material <NUM>. In this application, the first electronic component <NUM> and the second electronic component <NUM> are packaged in a same package structure <NUM>. In this way, the first electronic component <NUM> and the second electronic component <NUM> may be mounted on a back of the package substrate <NUM> through one mounting process, so that a quantity of times of mounting can be reduced, to improve production efficiency and reduce product processing costs.

For example, the second electronic component <NUM> may be a component such as an integrated chip, a switch element, a resistor, a capacitor, or a magnetic core. The integrated chip may be a voltage conversion chip, a transformer chip, or the like. This is not limited herein.

It should be noted that, in this application, a main difference between the first electronic component <NUM> and the second electronic component <NUM> lies in that sides of the first electronic component <NUM> each have a conductive connection pad, and only one side of the second electronic component <NUM> has a conductive connection pad. For example, in actual application, the first electronic component <NUM> needs to be electrically connected to both the package substrate and a PCB; and in actual application, the second electronic component <NUM> only needs to be electrically connected to the package substrate or the PCB. During specific implementation, as shown in <FIG>, a height H2 of the second electronic component <NUM> is generally less than or equal to a height H1 of the first electronic component <NUM>. The conductive connection pad is disposed on one side that is of the second electronic component <NUM> and that is close to the first surface 110a, and on one side of a second surface 110b, the filling material <NUM> covers the second electronic component <NUM>.

During specific implementation, to implement electrical connection between the conductive connection pads on both sides of the through hole, the through hole may be filled with the conductive material. However, when a thickness of a frame plate <NUM> is thick, a process of fully filling the through hole with the conductive material <NUM> is difficult. For example, as shown in <FIG>, the conductive material <NUM> may be formed on a side wall of the through hole V1, and then a region defined by the conductive material <NUM> is filled with a resin material <NUM>.

For example, the conductive material <NUM> may be a metal material, for example, gold, silver, aluminum, zinc, copper, chromium, nickel, or palladium. The resin material <NUM> may be a material such as epoxy resin. This is not limited herein.

For example, <FIG> is a schematic diagram of a cross-sectional structure of another package structure according to an embodiment of this application. In this application, a frame plate <NUM> may include at least two dielectric material plates disposed in a stacked manner. In the figure, the two dielectric material plates <NUM> and <NUM> are used as an example for illustration. Each one of dielectric material plates <NUM> and <NUM> has vias, and one through hole may include one via in each dielectric material plate. A routing layer <NUM> is further disposed between any two adjacent dielectric material plates <NUM> and <NUM>, and vias in the any two adjacent dielectric material plates <NUM> and <NUM> are electrically connected through the routing layer <NUM>. That is, locations of vias belonging to a same through hole may be different, and different vias are electrically connected through the routing layer <NUM>. In this way, the package structure <NUM> may have a possibility of re-routing, so that locations of a first conductive connection pad <NUM> and a second conductive connection pad <NUM> may be flexibly set, to reduce a trace pressure of a package substrate <NUM>.

For example, still refer to <FIG>. The routing layer <NUM> may include at least one conductive layer <NUM> and an insulation medium layer <NUM>, and a circuit trace is disposed on the conductive layer <NUM>. When the routing layer <NUM> includes two or more conductive layers <NUM>, the insulation medium layer <NUM> is provided with a medium through hole to connect circuit traces on different conductive layers <NUM>.

Optionally, <FIG> is a schematic diagram of a cross-sectional structure of another package structure according to an embodiment of this application. In a package structure <NUM>, a metal trace <NUM> may be disposed on a side wall of a hollowed-out region V2 of a frame plate <NUM>, and the metal trace <NUM> may extend from one side of a first surface 110a to one side of a second surface 110b through the side wall of the hollowed-out region V2. A plurality of conductive connection pads may further include: a sixth conductive connection pad <NUM> located on the first surface 110a and electrically connected to the metal trace <NUM>, and a seventh conductive connection pad <NUM> located on the second surface 110b and electrically connected to the metal trace <NUM>. That is, the metal trace <NUM> is used to replace the through hole, so that a quantity of the through hole V1 in the package structure <NUM> can be reduced.

Optionally, <FIG> is a schematic diagram of a cross-sectional structure of another package structure according to an embodiment of this application. In this application, the package structure <NUM> may further include an interconnection line layer <NUM>. The interconnection line layer <NUM> is located on a second surface 110b of a frame plate <NUM>. Both a second conductive connection pad <NUM> and a fourth conductive connection pad <NUM> are located on the interconnection line layer <NUM>. The second conductive connection pad <NUM> is electrically connected to a through hole through the interconnection line layer <NUM>, and the fourth conductive connection pad <NUM> is electrically connected to a first electronic component <NUM> through the interconnection line layer <NUM>. In this way, the interconnection line layer <NUM> is used, so that locations of the second conductive connection pad <NUM> and the fourth conductive connection pad <NUM> may be re-arranged.

During specific implementation, the interconnection line layer <NUM> may include an insulation medium layer <NUM> and at least two conductive layers <NUM>. A circuit trace is disposed on each conductive layer <NUM>, and the insulation medium layer <NUM> is provided with a medium through hole to connect circuit traces on different conductive layers <NUM>.

<FIG> shows a preparation method of a package structure according to an embodiment of this application. The preparation method may include the following steps.

Step S101: Form a first conductive connection pad on a first surface of a frame plate.

During specific implementation, as shown in <FIG>, a frame plate <NUM> may be made of a dielectric material, and the frame plate <NUM> has a first surface 110a and a second surface 110b that are opposite and parallel to each other.

During specific implementation, a thickness of the frame plate may be designed based on a height of a first electronic component.

For example, as shown in <FIG>, the first surface 110a of the frame plate <NUM> may be first electroplated with a copper layer, and then the copper layer is etched to form a first conductive connection pad <NUM>.

Step S102: Form a through hole in a region that is of the frame plate <NUM> and that corresponds to the first conductive connection pad <NUM>.

For example, as shown in <FIG>, a hole is made, in a mechanical drilling manner, in the region that is of the frame plate <NUM> and that corresponds to the first conductive connection pad <NUM>.

For example, as shown in <FIG>, a side wall of the hole may be first plated with a conductive material <NUM>; and then, as shown in <FIG>, the hole plated with the conductive material <NUM> is filled with a resin material <NUM>, to form a through hole V1.

Optionally, in this application, the frame plate <NUM> may alternatively be formed by a plurality of dielectric material plates. Herein, an example in which the frame plate <NUM> is formed by two dielectric material plates is used. The forming a first conductive connection pad on a first surface of a frame plate in step S101 and the forming a through hole in a region that is of the frame plate and that corresponds to the first conductive connection pad in step S102 may include the following.

As shown in <FIG>, the first conductive connection pad <NUM> is formed on a surface of one side of a first dielectric material plate <NUM>.

As shown in <FIG>, a first via is formed in a region that is of the first dielectric material plate <NUM> and that corresponds to the first conductive connection pad <NUM>.

For example, mechanical drilling may be performed on the region that is of the first dielectric material plate <NUM> and that corresponds to the first conductive connection pad <NUM>, to form the first via. Then, a side wall of the first via is plated with the conductive material <NUM>, and the first via plated with the conductive material <NUM> is filled with the resin material <NUM>.

As shown in <FIG>, a routing layer <NUM> is formed on one side that is of the first dielectric material plate <NUM> and that is away from the first conductive connection pad <NUM>, and the routing layer <NUM> is electrically connected to the first via of the first dielectric material plate <NUM>.

For example, the routing layer <NUM> may include at least one conductive layer <NUM> and an insulation medium layer <NUM>, and a circuit trace is disposed on the conductive layer <NUM>. When the routing layer <NUM> includes two or more conductive layers <NUM>, the insulation medium layer <NUM> is provided with a medium through hole to connect circuit traces on different conductive layers <NUM>.

As shown in <FIG>, a second dielectric material plate <NUM> is formed on one side that is of the routing layer <NUM> and that is away from the first dielectric material plate <NUM>.

As shown in <FIG>, a second via is formed in the second dielectric material plate <NUM>, and the routing layer <NUM> is electrically connected to the second via of the second dielectric material plate <NUM>. A surface, of the first dielectric material plate <NUM>, on which the first conductive connection pad <NUM> is disposed is the first surface 110a of the frame plate <NUM>, and a surface that is of the second dielectric material plate <NUM> and that is away from the first conductive connection pad <NUM> is the second surface 110b of the frame plate <NUM>.

For example, mechanical drilling may be performed on a region that is of the second dielectric material plate <NUM> and that corresponds to a to-be-formed second conductive connection pad <NUM>, to form the second via. Then, a side wall of the second via is plated with the conductive material <NUM>, and the second via plated with the conductive material <NUM> is filled with the resin material <NUM>.

Step S103: As shown in <FIG>, form a hollowed-out region V2 in the frame plate <NUM>.

For example, a milling cutter may be used to form the hollowed-out region in the frame plate.

Step S104: Cause the first surface of the frame plate to face downward; place the first electronic component in the hollowed-out region, where the first electronic component has a third conductive connection pad; and cause a surface of the third conductive connection pad and a surface of the first conductive connection pad to be in a same plane.

Optionally, as shown in <FIG>, before the placing the first electronic component <NUM> in the hollowed-out region, the first surface 110a of the frame plate <NUM> is caused to face downward, and the frame plate <NUM> on which the first conductive connection pad <NUM>, the through hole V1, and the conductive material <NUM> are formed is placed on a peelable mask <NUM>, to fasten the first electronic component <NUM> by using stickiness of the peelable mask <NUM>.

For example, a material of the peelable mask may be an ultraviolet photoinduced peelable mask, and the ultraviolet photoinduced peelable mask may lose stickiness after being exposed to ultraviolet light.

As shown in <FIG>, the first electronic component <NUM> is placed in the hollowed-out region V2, where the first electronic component <NUM> has the third conductive connection pad <NUM>; and the surface of the third conductive connection pad <NUM> and the surface of the first conductive connection pad <NUM> are caused to be in the same plane.

Optionally, when a second electronic component needs to be disposed in the package structure, refer to <FIG>. The second electronic component <NUM> may be further disposed in the hollowed-out region V2, where the second electronic component <NUM> has a fifth conductive connection pad <NUM>. A surface of the fifth conductive connection pad <NUM> and the surface of the first conductive connection pad <NUM> are caused to be in a same plane.

During specific implementation, all electronic components may be mounted in the hollowed-out region by using a surface mount technology (surface mount technology, SMT) machine.

Step S105: As shown in <FIG>, fill a gap of the hollowed-out region with a filling material <NUM>.

During specific implementation, a dispensing machine may be used to dispense the filling material, for example, a filling adhesive, at a gap that is in the hollowed-out region and that is between the electronic component and the frame plate, and fully fill the hollowed-out region.

Step S106: As shown in <FIG>, grind the second surface of the frame plate <NUM>.

During specific implementation, the second surface of the frame plate <NUM> is ground until a conductive connection part of the first electronic component <NUM> is exposed, so that a fourth conductive connection pad electrically connected to the first electronic component <NUM> can be subsequently formed on the second surface.

Step S107: As shown in <FIG>, form, on the second surface 110b, the fourth conductive connection pad <NUM> electrically connected to the first electronic component <NUM>, and the second conductive connection pad <NUM> electrically connected to the through hole.

For example, the second surface may be first electroplated with the copper layer, and then the copper layer is etched to form the second conductive connection pad and the fourth conductive connection pad.

During specific implementation, when the first surface is placed on the peelable mask, the peelable mask <NUM> further needs to be peeled off after the second conductive connection pad <NUM> and the fourth conductive connection pad <NUM> are formed, to form the package structure <NUM> shown in <FIG>.

During specific implementation, when the peelable mask is the ultraviolet photoinduced peelable mask, the ultraviolet photoinduced peelable mask may be caused to lose the stickiness through exposure to the ultraviolet light, and then the peelable mask is peeled off from one side of the first surface.

During specific implementation, when the package structure is prepared, a plurality of package structures are generally prepared on a large frame plate, and after the peelable mask is peeled off, die attaching is performed to form a plurality of independent package structures.

In this application, the plurality of package structures may be simultaneously mounted on a plurality of package substrates before singulation, and then die attaching is performed. In this way, production efficiency can be further improved. Certainly, a single package structure may alternatively be mounted on a single package substrate after die attaching. This is not limited herein.

Optionally, in this application, when the first conductive connection pad is formed on the first surface of the frame plate, the method may further include: forming a sixth conductive connection pad on the first surface of the frame plate; after the forming a hollowed-out region in the frame plate, and before the placing the first electronic component in the hollowed-out region, the method further includes: forming a metal trace on a side wall of the hollowed-out region, where the metal trace is electrically connected to the sixth conductive connection pad; and when the fourth conductive connection pad electrically connected to the first electronic component, and the second conductive connection pad electrically connected to the through hole are formed on the second surface, the method further includes: forming, on the second surface, a seventh conductive connection pad electrically connected to the metal trace. That is, the metal trace is used to replace the through hole, so that a quantity of the through hole in the package structure can be reduced. For example, the metal trace may be formed through electroplating. This is not limited herein.

It should be noted that a sequence of some steps in the preparation method provided in this application may be interchanged, and is not limited to the sequence mentioned in the foregoing embodiment.

Accordingly, as shown in <FIG>, this application further provides a package module <NUM>, including a package substrate <NUM> and a package structure <NUM> mounted on the package substrate <NUM>. The package structure <NUM> is any one of the foregoing package structures <NUM> provided in embodiments of this application. A problem-resolving principle of the package module <NUM> is similar to that of the foregoing package structure <NUM>. Therefore, for the implementation of the package module <NUM>, refer to the implementation of the foregoing package structure <NUM>, and details are not described again.

During specific implementation, the package substrate may be any structure on which a line is disposed, such as a re-routing layer, a substrate, or a silicon interposer (interposer). This is not limited herein.

For example, the package structure may be mounted on the package substrate by using technologies such as SMT.

In an embodiment, the package structure <NUM> may be mounted on a back of the package substrate <NUM>, an electronic component <NUM> is generally disposed on a front of the package substrate <NUM>, and a conductive connection pad (not shown in the figure) of the electronic component <NUM> on the front of the package substrate <NUM> is led out through a conductive connection pad <NUM> disposed on the back of the package substrate <NUM>.

For example, in this application, refer to <FIG>. When the package structure <NUM> is mounted on a back of the package substrate <NUM>, one side of the first surface of the frame plate <NUM> in the package structure <NUM> may be disposed facing the package substrate <NUM>. In this way, the package structure <NUM> may not only package a first electronic component <NUM> on the back of the package substrate <NUM>, but may also use a through hole in the package structure <NUM> to lead out the conductive connection pad on the back of the package substrate <NUM>, to resolve a problem of a height difference between the conductive connection pad on the back of the package substrate <NUM> and a conductive connection pad of the first electronic component <NUM>. In addition, because the package structure <NUM> is a structure in which the through hole and the first electronic component <NUM> are formed into a same module, a tolerance existing in the package structure <NUM> basically does not affect conductive connection pads of which surfaces are in a same plane. Therefore, a height difference between the second conductive connection pad <NUM> and the fourth conductive connection pad <NUM>, and a height difference between the first conductive connection pad <NUM> and the third conductive connection pad <NUM> may be controlled to be within <NUM>, to reduce a risk of mounting the package module on the board. In addition, in this application, a plurality of first electronic components <NUM> may be packaged in the package structure <NUM> and may be mounted on the back of the package substrate <NUM> through one mounting process. Compared with the conventional technology in which each first electronic component <NUM> and an elevating plate are separately mounted, a quantity of times of mounting can be obviously reduced, to improve production efficiency and reduce product processing costs.

Accordingly, this application further provides an electronic device. As shown in <FIG>, the electronic device includes a housing <NUM>, a circuit board <NUM> located in the housing <NUM>, and a package module <NUM>. The package module <NUM> is located on the circuit board <NUM>, and the package module <NUM> is electrically connected to the circuit board <NUM>. For example, the circuit board may be a PCB. A problem-resolving principle of the electronic device is similar to that of the foregoing package module <NUM>. Therefore, for implementation of the electronic device, refer to implementation of the foregoing package module <NUM>, and details are not described again.

During specific implementation, the electronic device may be a power supply circuit, and the power supply circuit is configured to perform functions such as conversion, distribution, and detection of electric energy, and other electric energy management and control.

Claim 1:
A package structure (<NUM>), comprising: a frame plate (<NUM>), a first electronic component (<NUM>), a filling material (<NUM>), and a plurality of conductive connection pads, wherein
the frame plate (<NUM>) is made of a dielectric material, the frame plate (<NUM>) has a first surface (110a) and a second surface (110b) that are opposite and parallel to each other, the frame plate (<NUM>) comprises a through hole (V1), and the frame plate (<NUM>) has a hollowed-out region (V2);
both the filling material (<NUM>) and the first electronic component (<NUM>) are located in the hollowed-out region (V2), and the first electronic component (<NUM>) is fastened in the hollowed-out region (V2) by using the filling material (<NUM>); and
the plurality of conductive connection pads comprise: a first conductive connection pad (<NUM>) located on the first surface (110a) and electrically connected to the through hole (V1), a second conductive connection pad (<NUM>) located on the second surface (110b) and electrically connected to the through hole (V1), a third conductive connection pad (<NUM>) located on the first surface (110a) and electrically connected to the first electronic component (<NUM>), and a fourth conductive connection pad (<NUM>) located on the second surface (110b) and electrically connected to the first electronic component (<NUM>),
wherein the frame plate (<NUM>) comprises at least two dielectric material plates (<NUM>; <NUM>) disposed in a stacked manner;
the through hole (V1) comprises vias located in each dielectric material plate (<NUM>; <NUM>); and
a routing layer (<NUM>) is further disposed between any two adjacent dielectric material plates (<NUM>; <NUM>), and vias in the any two adjacent dielectric material plates (<NUM>; <NUM>) are electrically connected through the routing layer (<NUM>), wherein the routing layer (<NUM>) includes at least one conductive layer (<NUM>) and an insulation medium layer (<NUM>) and a circuit trace is disposed on the conductive layer (<NUM>).