Texas Instruments provides a recommended PCB layout in the LM25574MT evaluation module documentation, which includes guidelines for component placement, thermal management, and routing. Following this layout can help ensure optimal performance and minimize noise and EMI.
The selection of input and output capacitors depends on the specific requirements of your application, including the input voltage range, output voltage, and desired ripple and noise performance. TI provides guidelines for capacitor selection in the datasheet and application notes, and online tools such as the TI Capacitor Selection Tool can also be helpful.
While the datasheet specifies an operating junction temperature range of -40°C to 125°C, the maximum ambient temperature range for reliable operation depends on the specific application and thermal management. In general, it's recommended to keep the ambient temperature below 85°C to ensure reliable operation and minimize thermal stress.
To ensure EMC in your design, follow best practices for PCB layout, component selection, and shielding. TI provides guidelines for EMC in the datasheet and application notes, and online resources such as the TI EMC Guide can also be helpful. Additionally, consider using a shielded inductor and following proper grounding and decoupling techniques.
The recommended input voltage range for optimal efficiency depends on the specific application and output voltage requirements. In general, operating the LM25574MT near the nominal input voltage range of 4.5V to 18V can help ensure optimal efficiency. However, the device can operate with input voltages as low as 3.5V and as high as 20V, depending on the specific requirements of your application.
LM25574MT datasheet
by Texas Instruments
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