Texas Instruments recommends a compact layout with the IC placed close to the input capacitors and output inductors. The input and output pins should be routed away from each other to minimize noise coupling. A 4-layer PCB with a solid ground plane is recommended for optimal performance.
The inductor value depends on the input voltage, output voltage, and switching frequency. A good starting point is to use the inductor value calculation formula provided in the datasheet. Additionally, consider the inductor's saturation current, DC resistance, and core material to ensure optimal performance.
Although the datasheet specifies a maximum input voltage of 18V, the IC can handle up to 20V with some derating. However, it's essential to ensure that the input voltage does not exceed 20V to prevent damage to the IC.
To minimize noise and EMI, use a shielded inductor, place the IC away from noise-sensitive components, and use a common-mode choke on the input lines. Additionally, ensure that the PCB layout is compact, and the input and output capacitors are placed close to the IC.
The MC33078DG4 has a thermal derating of 1.5°C/W above 25°C. This means that for every 1°C increase in ambient temperature above 25°C, the maximum power dissipation decreases by 1.5W.
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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.
