A robust, high-efficiency synchronous step-down (Buck) DC-DC converter designed for industrial 24V power networks. It steps down 24V to a stable 5V output (up to 2A), making it ideal for powering industrial sensors, microcontrollers, and logic circuits.

The project is built on a 4-layer PCB using Altium Designer and features comprehensive input protection and EMI filtering for reliable operation in noisy industrial environments.

Technical Specifications

• Core IC: Texas Instruments LMR14030SDDAR (Step-Down Regulator with Integrated MOSFET)
• Input Voltage: 24V DC (Industrial standard)
• Output Voltage/Current: 5V DC @ 2A max
• PCB Stackup: 4 Layers (Top/Signal - Layer 2/GND - Layer 3/Power - Bottom/Signal)
• Component Size: SMD down to 0603 (optimized for hand-soldering with solder paste and hot air reflow).
• Input Protection: Reverse polarity protection via P-channel MOSFET and overcurrent protection via a resettable PTC fuse.
• Filtering: Pi-filter (CLC) at the input to suppress switching noise and EMI.

PCB Layout & Grounding Strategy

• Split Ground Planes: To ensure high noise immunity, the noisy power ground (GND) of the switching converter and the input industrial network ground are strategically isolated/separated, preventing high-frequency switching currents from corrupting sensitive signals.
• Power Integrity (PI): A continuous solid GND plane on Layer 2 provides a low-impedance return path and minimizes loop inductance.
• Thermal Management: Integrated thermal vias under the LMR14030 PowerPAD efficiently dissipate heat to the internal and bottom copper layers.