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Schematic Breadboard Power Supply Module 5V 3.3V

Engineering background:
When using a breadboard for learning about lighting up WS2812 LEDs, the author found that supplying power to the microcontroller via USB was insufficient to drive the LEDs properly when there were many of them. Existing power supply modules found online were too basic and had the risk of unstable power supply. Therefore, a power supply module was designed to supply 3.3V to the microcontroller and 5V to the LEDs.

Design solution:
A DC DC BUCK circuit was used to step down the input power to 5V, with the TI LMR14050SDDA as the main BUCK IC, supporting up to 40V input (marked as 36V on the PCB for safety reasons). The default output is 3A, with a maximum of 5A (note the need for heat dissipation). The 5V power supply was further stepped down to 3.3V using an LDO for the microcontroller or other 3V3 modules, with the choice of the classic 1117 chip and a toggle switch for adjusting the output voltage.

Due to the varying load requirements for lighting up, additional capacitors were used for stabilization after the BUCK circuit. The 47uF capacitor may be omitted if there are no heavy load scenarios.

Testing with a 19V

Input showed that the 5V power supply worked properly (slight voltage error due to feedback resistor tolerance).

Switching to 3.3V also worked properly.

About IC LMR14050

The IC LMR14050 is a highly efficient, synchronous buck regulator that is designed to provide a regulated output voltage from a wide range of input voltages. It is capable of delivering up to 5A of continuous output current with excellent load and line regulation. The device features an adjustable output voltage, enabling flexibility in various applications. With a high switching frequency and integrated power MOSFETs, the LMR14050 offers a compact and cost-effective solution for powering a variety of electronic devices. Additionally, it includes a comprehensive set of protection features such as overcurrent protection, thermal shutdown, and undervoltage lockout to ensure safe and reliable operation. Overall, the LMR14050 is a versatile and reliable regulator suitable for various power management applications.

BOM Breadboard Power Supply Module 5V 3.3V

Download files, links, and notes

• Download PCB in Gerber + BOM + Centroid File
• Mirror
• SIMPLE SWITCHER® 40-V, 5-A, 2.2-MHz step-down converter with 40-μA IQPDF Datasheet IC LMR14050 – 
• AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A)
• SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations
• AN-643 EMI/RFI Board Design (Rev. B)
• Extending Buck Regulator to Positive Buck-Boost Configuration
• How to Evaluate the Maximum Inductor in Internal Compensation PCM Buck Converter
• Design Feedforward Capacitor for LMR14020
• Simple Solution for EMI Filter Stability Issue in DC/DC Converters (Rev. A)
• Buy Breadboard Power Supply Module 5V 3.3V

source: https://oshwhub.com/ysmjaycn/breadboard-power-supply-module-5v5amax-3v3