Switching Regulator Package With Extension Pin
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Solution Overview
Problem
Traditional integrated circuit package assemblies for switching regulators face issues with voltage spikes causing noise interference, current leakage failures, and poor heat dissipation, particularly due to the close proximity of switching pins and adjacent components.
Innovation Solution
The integrated circuit package assembly includes a power switch chip, a control chip, a leadframe with an extension pin integrally formed with the substrate, and a conductive connection between the power switch chip's reverse side and the substrate, along with a higher permittivity package encapsulant to improve insulation and heat dissipation, while arranging the extension pin far away from discrete pins to minimize noise interference and current leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the switching pin is placed close to adjacent pins to reduce package size, then the package density increases, but voltage spikes cause noise interference and current leakage failures
Solution Approach 1:
The switching terminal is extracted from the standard pin array and connected to an extension pin that extends outward from the substrate. This separates the switching terminal from adjacent pins, eliminating noise interference and current leakage while maintaining a compact package footprint.
Solution Approach 2:
The switching terminal connection transitions from a planar arrangement on the substrate to a three-dimensional configuration using an extension pin that protrudes from the substrate surface. This dimensional change allows the switching terminal to be electrically connected while physically isolated from adjacent pins.
2Ease of manufacture
If traditional leadframe structures are used to connect the power switch chip, then the manufacturing process is simple, but heat dissipation performance is poor
Solution Approach 1:
The leadframe is segmented into a substrate and a separate extension pin component. The extension pin serves as a dedicated heat dissipation pathway, thermally coupled to the power switch chip's second electrode, while the substrate provides the electrical connection platform. This segmentation optimizes both thermal and electrical performance.
3Reliability
If the switching terminal is electrically connected to adjacent pins through the substrate, then the electrical connectivity is achieved, but voltage spikes cause noise interference to adjacent pins
Solution Approach 1:
The switching terminal is extracted from the shared substrate connection and assigned its own dedicated extension pin. This extraction eliminates the coupling between the switching terminal and adjacent pins, preventing noise interference while maintaining electrical connectivity to the external circuit.
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 effectively reduces noise interference and current leakage failures while enhancing heat dissipation, resulting in improved performance and reliability of the integrated circuit package assembly for switching regulators.
Implementation Method 1
the reverse side of the power switch chip is arranged on the substrate of the leadframe by a conductive material to electrically connect the second electrode to the substrate
Implementation Method 2
along with a higher permittivity package encapsulant to improve insulation and heat dissipation
Implementation Method 3
arranging the extension pin far away from discrete pins to minimize noise interference and current leakage
Data Source
AI summary
In one embodiment, an IC package assembly for a switching regulator, can include: a power switch chip including a control electrode and a first electrode on an obverse side and a second electrode on a reverse side, where the second electrode is configured as a switching terminal of a switching regulator; a control chip including a driving electrode and a plurality of input and output electrodes on the obverse side; and a leadframe including an extension pin, a substrate, and a plurality of discrete pins, where the extension pin is formed integrally with the substrate, and where the reverse side of the power switch chip is arranged on the substrate of the leadframe by a conductive material to electrically connect the second electrode to the substrate.