PCB Remote Sense Layout for Precise IC Voltage Regulation
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Solution Overview
Problem
Existing voltage regulators struggle to precisely regulate the voltage provided to integrated circuits due to voltage drops along the power path, especially under high current demand, which can lead to deviations outside the necessary range for proper device functionality.
Innovation Solution
A direct connection between the sense line of the voltage regulator and the integrated circuit's power plane allows for precise voltage regulation by sensing load variations directly at the point-of-load, using a switching voltage regulator to maintain a fixed output voltage within a narrow range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sense line is used to connect the regulator to the point-of-load, then the voltage regulation precision is improved, but the voltage drop between the sensed location and the point-of-load cannot be completely eliminated
Solution Approach 1:
The patent introduces an isolated pin as an intermediary element that provides a dedicated electrical path from the sense circuit to the IC power plane. This isolated pin acts as a mediator that allows the sense line to directly sense the voltage at the point-of-load without being affected by the impedance of the shared power distribution network, thereby eliminating the voltage drop between the sensed location and the actual point-of-load.
Solution Approach 2:
The patent segments the electrical connection by creating a separate, isolated path for the sense line through the isolated pin. This segmentation divides the原本 shared power distribution network into distinct pathways: one for power delivery and another for voltage sensing. By separating these functions, the sense line can accurately measure the voltage at the point-of-load without the interference of current flowing through shared traces, thus eliminating voltage drop errors.
2Adaptability or versatility
If the regulator is placed at a distance from the integrated circuit, then the device layout flexibility is improved, but the voltage drop along the power path increases
Solution Approach 1:
The isolated pin serves as a mediator that extends the regulator's sensing capability to the point-of-load without requiring a direct physical connection. This allows the regulator to be placed anywhere on the PCB while maintaining accurate voltage sensing through the isolated pin's dedicated connection to the IC power plane, thus decoupling layout flexibility from voltage drop concerns.
3Device complexity
If the sense line carries current to the point-of-load, then the power delivery is simplified, but the voltage observed by the regulator does not match the voltage at the point-of-load
Solution Approach 1:
The patent segments the electrical connections by creating separate pathways for power delivery and voltage sensing. The isolated pin provides a dedicated sense path that is electrically isolated from the power delivery traces, allowing the sense line to carry negligible current while accurately measuring the voltage at the point-of-load. This segmentation eliminates the conflict between power delivery and voltage measurement functions.
Solution Approach 2:
The isolated pin acts as an intermediary that provides a dedicated, low-impedance path for voltage sensing. By routing the sense line through this isolated pin directly to the IC power plane, the system ensures that the voltage observed by the regulator matches the actual voltage at the point-of-load, independent of the power delivery path's impedance and current flow.
Data Source
AI summary
Apparatuses and methods are provided for providing electrical power to electronic devices. The apparatuses include a printed circuit board (PCB) having a power circuit and a sense circuit electrically isolated from each other, an integrated circuit (IC) having an IC power plane, power pins electrically coupled to the power circuit, and an isolated pin electrically coupled to the sense circuit, wherein the power pins are electrically coupled to the isolated pin via the IC power plane, and a voltage regulator having output pins electrically coupled to the power circuit and a sense pin electrically coupled to the sense circuit, wherein the voltage regulator is configured to provide electrical power to the IC via the power circuit, sense a load variation at the sense pin, and regulate a voltage of the electrical power based on the load variation sensed.