The article is being published in collaboration with JLCPCB. It is one of the most experienced PCB manufacturers with more than a decade in the field of PCB prototype and fabrication, they are committed to meeting the needs of our customers from different industries in terms of quality, delivery, cost-effectiveness, and any other demanding requests.


The LMR14030 is a 40 V, 3.5 A step-down regulator with an integrated high-side MOSFET. With a wide input range from 4 V to 40 V, it's suitable for various applications from industrial to automotive for power conditioning from unregulated sources. The regulator's quiescent current is 40 A in Sleep-mode, which is suitable for battery-powered systems. An ultra-low 1 UA current in shutdown mode can further prolong battery life. A wide adjustable switching frequency range allows either efficiency or external component size to be optimized. Internal loop compensation means that the user is free from the tedious task of loop compensation design. This also minimizes the external components of the device. A precision enables input allows simplification of regulator control and system power sequencing. The device also has built-in protection features such as cycle-by-cycle current limit, thermal sensing and shut down due to excessive power dissipation, and output overvoltage protection.


• 4 V to

40 V Input Range

• 3.5 A Continuous Output Current Ultra-low 40 MA Operating Quiescent Current

• 90 m2 High-Side MOSFET

• Minimum Switch-On Time: 75 ns

• Current Mode Control Adjustable Switching Frequency from 200 kHz to 2.5 MHz Frequency Synchronization to External Clock Internal Compensation for Ease of Use High Duty Cycle Operation Supported

• Precision Enable Input

• 1 UA Shutdown Current

• External Soft-start

• Thermal, Overvoltage, and Short Protection

• 8-Pin HSOIC with PowerPAD TM Package

Bill of Material

1. CL21B104KCFNNNE: 0.1 µF ±10% 100V

Ceramic Capacitor X7R

Package: 0805 (2012 Metric)

2. CL31A475KOHNNNE: 4.7µF ±10% 16V Ceramic Capacitor X5R 1206 (3216 Metric)

Package: 1206 (3216 Metric)

3. LMR14030SDDAR: SIMPLE SWITCHER 40-V, 3.5-A, 2.2-MHz step-down converter with 40-uA IQ 8-SO PowerPAD -40 to 125

Package: HSOIC-8

4. MBRS540T3G: Diode Schottky 40 V 5A Surface Mount

Package: SMC-2

5. ASMPH-0603-2R2M-T: 2.2 µH Shielded Multilayer Inductor 850 mA 300mOhm

Package: 0603 (1608 Metric)

6. GRM32ER61C476KE15L: 47 µF ±10% 16V Ceramic Capacitor X5R

Package: 1210 (3225 Metric)

7. 0805W8F1212T5E: 12.1 kohm

Package: 0603

8. 0805W8F6492T5E: 64.9 kohm

Package: 0603


Schematics for DC Power Supply

3D Viewer

Steps to Order PCBs From JLCPCB

Full Process is shown using Screenshots Step-wise

Now we have got the PCB design and it’s time to order the PCBs. For that, you just have to go to JLCPCB click on the“QUOTE NOW” button.

JLCPCB is also a sponsor of this project. JLCPCB (ShenzhenJLC Electronics Co., Ltd.), is the largest PCB prototype enterprise in China and a high-tech manufacturer specializing in quick PCB prototype and small-batch PCB production. You can order a minimum of 5 PCBs for just $2.

To get the PCB manufactured, upload the Gerber file you downloaded in the last step. Upload file or you can also drag and drop the Gerber files.

After uploading the zip file, you’ll see a success message at the bottom if the file is successfully uploaded.

You can review the PCB in the Gerber viewer to make sure everything is good. You can view both the top and bottom of the PCB. After making sure our PCB looks good, we can now place the order at a reasonable price. You can order 5 PCBs for just $2 but if it’s your first order then you can get 5 PCBs for $2.

To place the order, click on the“SAVE TO CART” button. My PCBs took 2 days to get manufactured and arrived within a week using the DHL delivery option. PCBs were well packed and the quality was really good.