The recommended PCB layout for the MP3384LGQ-Z involves placing the input capacitors close to the VIN pin, and the output capacitors close to the VOUT pin. Additionally, the power traces should be wide and short to minimize resistance and inductance. A solid ground plane is also recommended to reduce noise and improve thermal performance.
The selection of input and output capacitors depends on the specific requirements of your application. For the MP3384LGQ-Z, a minimum of 4.7uF ceramic capacitor is recommended for the input, and a minimum of 10uF ceramic capacitor is recommended for the output. The capacitor values can be increased for improved performance and stability. It's also important to consider the capacitor's voltage rating, ESR, and temperature rating.
The MP3384LGQ-Z is rated for operation up to 85°C ambient temperature. However, the device's performance and reliability may degrade at higher temperatures. It's recommended to derate the device's output current and voltage according to the temperature derating curve provided in the datasheet.
The MP3384LGQ-Z has a built-in overcurrent protection (OCP) feature that limits the output current to a maximum of 3.5A. To implement short-circuit protection, an external resistor can be added in series with the output to detect short-circuit conditions. The OCP threshold can be adjusted by adding an external resistor in parallel with the internal OCP resistor.
When powering up multiple power rails using the MP3384LGQ-Z, it's recommended to sequence the power-up to prevent voltage overshoot and ensure stable operation. A recommended sequence is to power up the highest voltage rail first, followed by the lower voltage rails. The power-up sequence should be controlled using external logic or a power management IC.
MP3384LGQ-Z datasheet
by Monolithic Power Systems
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