The recommended PCB layout for the MP5000DQ-LF-Z involves placing the input and output capacitors close to the device, using wide traces for power lines, and separating the input and output sections to minimize noise coupling. A 4-layer PCB with a solid ground plane is also recommended.
To ensure stability and prevent oscillations, it's essential to follow the recommended component values and PCB layout guidelines. Additionally, the output voltage should be decoupled with a capacitor (e.g., 10uF) and a series resistor (e.g., 1Ω) to prevent oscillations.
Although the datasheet specifies a maximum input voltage of 5.5V, it's recommended to limit the input voltage to 5V to ensure reliable operation and prevent damage to the device.
The output voltage ripple and noise can be calculated using the equations provided in the datasheet. The output voltage ripple is primarily dependent on the output capacitor value, while the noise is dependent on the switching frequency and the output capacitor's ESR.
The thermal derating of the MP5000DQ-LF-Z is approximately 1.5°C/W. As the ambient temperature increases, the maximum output current must be derated to prevent overheating. The derating curve can be found in the datasheet.
MP5000DQ-LF-Z datasheet
by Monolithic Power Systems
