A good PCB layout for optimal thermal performance involves placing the device near a thermal pad or a heat sink, and ensuring good thermal conductivity between the device and the PCB. A 4-layer PCB with a solid ground plane and a thermal relief pattern can help to dissipate heat efficiently.
To ensure stability and prevent oscillations, it's essential to follow the recommended layout and component selection guidelines, including the use of a low-ESR output capacitor, a suitable inductor, and a stable input voltage. Additionally, the device's compensation pin should be properly connected to the output capacitor.
Although the datasheet specifies a maximum input voltage of 42V, the device can handle higher input voltages with proper derating. However, it's essential to ensure that the input voltage does not exceed the absolute maximum rating of 50V to prevent damage to the device.
When selecting an inductor for the LMR33620CDDAR, consider factors such as inductance value, DC resistance, and saturation current. A good starting point is to use an inductor with an inductance value between 1.5uH and 3.3uH, and a DC resistance of less than 100mΩ. The inductor should also be able to handle the peak current and have a saturation current rating above the maximum output current.
A good output capacitor for the LMR33620CDDAR should have a low equivalent series resistance (ESR) and a high ripple current rating. A ceramic capacitor with a capacitance value between 10uF and 22uF, and an ESR of less than 10mΩ, is a good starting point. The capacitor should also be able to handle the output voltage and ripple current.
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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.
