Texas Instruments provides a recommended PCB layout in the datasheet, but it's also important to follow general best practices for switching regulator layouts, such as keeping the input and output capacitors close to the IC, using a solid ground plane, and minimizing trace lengths and widths.
To ensure stability, make sure to follow the recommended component values and layout guidelines in the datasheet. Additionally, use a sufficient output capacitor with a low ESR, and consider adding a small ceramic capacitor (e.g. 10nF) in parallel with the output capacitor to improve stability.
While the datasheet specifies a maximum input voltage of 18V, it's recommended to derate this value by 10-20% to ensure reliable operation and prevent damage to the IC. Therefore, a maximum input voltage of 15-16V is recommended.
The LM2745MTCX/NOPB is rated for operation up to 125°C, but its performance and reliability may degrade at high temperatures. Be sure to follow the recommended operating conditions and consider using thermal management techniques, such as heat sinks or thermal interfaces, to keep the IC within its specified temperature range.
The power dissipation of the LM2745MTCX/NOPB can be calculated using the equation: Pd = (Vin - Vout) x Iout x efficiency. The efficiency can be estimated from the datasheet or measured in the application. Be sure to consider the maximum power dissipation rating of the IC and take steps to ensure it remains within its specified limits.
LM2745MTCX/NOPB datasheet
by Texas Instruments
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