Texas Instruments provides a recommended PCB layout in the LM25143QRHARQ1 datasheet, but it's also recommended to follow general guidelines for thermal design, such as using a solid ground plane, placing thermal vias under the device, and keeping the thermal path short and direct.
To ensure reliable start-up and operation with a wide input voltage range, it's recommended to follow the input voltage sequencing and ramp-up requirements outlined in the datasheet, and to use a suitable input capacitor to filter out noise and ripple.
When selecting the output inductor and capacitor values, consider the desired output voltage ripple, inductor core loss, and capacitor ESR. The datasheet provides guidelines for selecting these components, and TI also offers online tools and calculators to help with the design process.
To optimize the design for low EMI and noise, follow best practices for PCB layout, such as keeping the switching node away from sensitive nodes, using a shielded inductor, and adding EMI filters as needed. Additionally, consider using a spread-spectrum clock or frequency dithering to reduce EMI.
The LM25143QRHARQ1 has a maximum junction temperature of 150°C. For high-temperature operation, derate the device's power dissipation according to the thermal derating curve provided in the datasheet, and ensure that the device is properly heatsinked and cooled.
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About Texas Instruments
Texas Instruments (TI) designs and manufactures semiconductors and integrated circuits for a wide range of applications. The company's product portfolio includes analog chips, which are essential for managing power and signal functions in electronic devices, and embedded processors, which serve as the brains in various systems, enabling functionality in everything from industrial equipment to consumer electronics. TI's innovations in semiconductor technology have made it a leader in the industry.
