Amplifier Module Elongated Back Pad Heat Dissipation
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Solution Overview
Problem
Existing semiconductor amplifier modules face challenges in efficiently dissipating heat when transitioning from GaAs to GaN transistors, requiring a practical module design that accounts for power consumption and heat management without increasing module size.
Innovation Solution
The design incorporates an elongated back pad on the base of the amplifier module that extends to opposite edges, providing enhanced heat dissipation by connecting the die pad and back pad with via metals, forming a leadless chip carrier package with a rectangular base and lid, which effectively channels heat from the transistor to the host board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional base with a standard back pad is used, then the module structure is simple, but the heat dissipation capability is insufficient for GaN transistors
Solution Approach 1:
The base is divided into functionally distinct regions: a die pad region for mounting the transistor and a separately extended back pad region for heat dissipation. This segmentation allows the heat dissipation function to be enhanced without redesigning the entire base structure, thereby improving temperature management while maintaining structural simplicity.
Solution Approach 2:
The back pad is extended in one dimension (length) beyond the die pad boundaries, creating an elongated heat dissipation area. This dimensional extension increases the thermal contact area with the heat sink or substrate without significantly increasing the overall module footprint, thus improving heat dissipation capability with minimal structural complexity increase.
2Temperature
If the back pad area is increased to improve heat dissipation, then thermal efficiency improves, but the module size increases
Solution Approach 1:
The back pad is extended primarily in the length dimension rather than expanding area uniformly in all directions. This directional extension optimizes heat dissipation along the thermal path from the die pad to the heat sink while minimizing the increase in overall module footprint, thus improving thermal efficiency without proportionally increasing module size.
Solution Approach 2:
The base structure exhibits local quality variation: the back pad region has increased area specifically where heat dissipation is needed, while other regions maintain their original dimensions. This localized area increase concentrates thermal management resources where most needed, improving thermal efficiency without unnecessarily increasing the total module area.
3Power
If GaN transistors are used to output high power, then power output increases, but heat generation increases requiring better heat dissipation
Solution Approach 1:
The base is segmented into a die pad for power handling and an extended back pad for thermal management. This segmentation allows the high-power GaN transistor to be mounted on the die pad while the extended back pad provides dedicated thermal pathways, enabling high power output to be sustained without excessive heat accumulation.
Solution Approach 2:
The extended back pad acts as an intermediary thermal conduction path between the die pad (where heat is generated by the GaN transistor) and the external heat sink or substrate. This intermediary structure facilitates efficient heat transfer, allowing high power operation by mediating the heat flow and preventing thermal buildup at the transistor junction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration ensures secure and expanded heat dissipation from the transistor to the host board, maintaining a compact module size while improving thermal efficiency and power handling capabilities.
Implementation Method 1
The back pad is connected to the die pad with a via metal
Data Source
AI summary
An amplifier module having a surface-mounting carrier with a base and lid is disclosed. The base in a top surface thereof provides a die pad on which a transistor is mounted, and a back surface thereof provides a back pad electrically and thermally connected to the die pad. The back pad has an area wider than the area of the die pad. The heat conduction from the transistor to the host board on which the amplifier module is mounted is effectively enhanced.