PCB Board Design: A Step-by-Step Guide for Beginners

Printed Circuit Boards (PCBs) form the backbone of most modern electronic devices, providing a platform to connect electronic components. For beginners, PCB design can seem complex, but with the right approach, it becomes a manageable and rewarding task. This guide will walk you through the step-by-step process of designing a PCB, from planning to final checks.

Today, as an example, we will walk through the complete design process of a lithium-ion battery charging module. The classic TP4056 module is widely used but limited to approximately 1A charging current, leading to long charging times for higher-capacity batteries. To address this, we developed Version 2 by replacing the core circuit with the IP2312 IC while maintaining a similar compact PCB form factor (approximately 20 mm × 15 mm). The IP2312 is a high-efficiency synchronous buck charging IC capable of delivering up to 3A charging current, achieving around 94% efficiency at 2A output. This upgrade significantly shortens charging time and improves thermal performance. For the full detailed tutorial, please refer to the linked article.

Design Steps for Printed Circuit Board:

Step 1: Understanding Your Circuit Requirements

Before diving into design software, it's important to have a clear understanding of the circuit you want to build. Begin by drafting a schematic on paper or using software like KiCad, Eagle or EasyEDA. Include all necessary components, such as resistors, capacitors, microcontrollers, and connectors. Make sure each component is properly connected to ensure functionality. Usually the circuit design starts from a pen paper with inspiration from real world problems. Here in our case the problem is the large charging time of TP4056.

Step 2: Choose a PCB Design Software

For beginners, PCB design software with user-friendly interfaces is essential. Popular choices include KiCad, Eagle, and EasyEDA. These programs allow you to create schematics, layout the components, and design the traces that connect them. You can also find libraries of standard components to simplify the process. In order to keep the process simple we are using EasyEDA because of its huge library and online database.

Step 3: Create the Schematic

Once you have chosen your software, start by creating the schematic diagram. A schematic is a blueprint of the electrical connections, showing how components are linked. The schematics for a PCB can be created by having a look at the IC datasheet and arranging all the components as per that.

Sometimes we need to change the component values, types depending upon use cases. There are a lot of other alternatives to a certain component. The example schematic of the IP2312 based charging module is attached above, the circuit is sectioned into different parts to increase the overall readability and to reduce R&D time.

According to the example schematic of the IP2312-based charging module, the circuit is divided into several functional sections — input protection, charging control, battery management, and status indication — to improve readability and reduce design iterations. When selecting components, pay attention to voltage ratings (e.g., capacitors should be rated at least 25V), current handling capability, and thermal characteristics, especially for the inductor and power MOSFETs inside or around the IP2312.

Step 4: Define the PCB Layout

After completing your schematic, the next step is defining the physical layout of your PCB. Which includes the following steps:

• Set the dimensions of the board.
• Place components logically to minimize trace length and optimize performance.
• Ensure components with specific orientations, like LEDs or connectors, are properly aligned.
• Avoid overlapping components and ensure there's enough clearance for soldering.

Here in our design all the components are placed near to each other to minimize trace length. As we are using a very small form factor of TP4056 and packing IP2312 in that orientation of components plays an important role in routing.

Step 5: Route Traces

Routing traces is one of the most critical steps in PCB design. Traces are the copper paths that electrically connect components. Follow these guidelines:

• Keep traces as short and direct as possible to minimize resistance, inductance, and electromagnetic interference.
• Use wider traces for power and ground paths, especially in high-current applications.
• Follow standard design rules for trace width and spacing to prevent short circuits and manufacturing issues.
• Consider current-carrying capacity and heat dissipation.

Recommended Trace Width for 1 oz Copper (External Layers, ~10°C Temperature Rise):

In our 3A charging module, the input, output, and battery traces were widened to at least 1.2–1.8 mm. We initially used autorouting for speed, then performed manual optimization to ensure smooth current paths and avoid sharp angles. Vias were used sparingly with adequate sizing to maintain reliability.

Step 6: Add Power and Ground Planes

For PCBs handling significant current, such as our 3A charger, adding power and ground planes is highly recommended. A ground plane provides a low-impedance return path, reduces electrical noise, minimizes EMI, and helps with heat dissipation.

In this two-layer design, we implemented copper pours for ground on both top and bottom layers, connecting them with multiple stitching vias. This configuration effectively reduces input voltage ripple and improves overall system stability. When pouring copper, remember to add thermal reliefs on component pads to make hand soldering easier while maintaining good electrical and thermal connection.

Step 7: Place Silkscreen and Other Markings

Add silkscreen labels for component identifiers, pin numbers, logos, or regulatory markings. The silkscreen layer is a vital tool for assembly and troubleshooting, helping to identify components and their placement. Make sure it doesn’t interfere with pads or traces. For more see our full article on a comprehensive guide on PCB silkscreen.

Step 8: Verify with Design Rule Check (DRC)

Before finalizing your design, run a Design Rule Check (DRC) to catch any errors such as spacing issues or unconnected traces. Most PCB design software includes a DRC tool, which helps ensure the design meets the manufacturer’s specifications and is error-free.

Step 9: Generate Gerber Files

After your design is complete and verified, you need to export Gerber files. These files contain the necessary information for manufacturers to fabricate your PCB. Each layer of your PCB (e.g., copper layers, silkscreen, solder mask) will be represented in these files.

Step 10: Thermal Management and Final Verification

High-current designs like the 3A IP2312 charger generate more heat. Pay special attention to thermal management by using wider copper areas, placing the inductor and IC away from sensitive components, and considering board thickness (1.0–1.6 mm is typical). After layout, perform a thorough Design Rule Check (DRC), simulate power integrity if possible, and visually inspect for potential issues. Finally, order prototype boards and test them under real load conditions to validate charging current, efficiency, and temperature rise.

Advantages of Using EasyEDA:

EasyEDA is a versatile tool for electronic engineers, hobbyists, and students, enabling fast and efficient circuit design, testing, and validation. Its user-friendly interface and unique features have made it a popular choice.

• Integration with Other Tools: EasyEDA supports multiple file formats like Altium, Eagle, and KiCad, making design import/export seamless. It also integrates with cloud platforms like Dropbox and Google Drive for easy project sharing and backup.

• Low Cost: EasyEDA is cost-effective, offering free options for small projects and affordable premium plans for advanced features.

• 3D Visualization: With its 3D visualization feature, users can view PCB designs in real-time, helping with component placement and identifying potential design issues.

• Schematic Capture and PCB Design: Users can design both schematics and PCBs in the same platform, with tools for importing designs or creating new ones from scratch.

• Large Component Library: EasyEDA offers an extensive library of components, including resistors, capacitors, transistors, and ICs. Users can also create or import custom components.

FAQ about PCB Board Design

Conclusion:

Finally, once you have your Gerber files, you can submit them to a PCB manufacturer. Many manufacturers offer online quoting tools where you upload the files, choose board specifications (such as material and thickness), and place your order.

Designing a PCB may seem intimidating at first, but by following these steps, even beginners can create functional and well-designed circuit boards. Practice is key over time, you'll develop the skills to optimize layouts, minimize noise, and produce high-quality designs. Happy designing.