MP4350DQ-LF-Z datasheet by Monolithic Power Systems

MP4350DQ-LF-Z Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal thermal performance?
  A good PCB layout for the MP4350DQ-LF-Z should prioritize thermal dissipation. Place the device near a thermal pad or a heat sink, and ensure that the thermal vias are connected to a solid copper plane on the bottom layer. Keep the input and output capacitors close to the device to minimize parasitic inductance.
• How do I optimize the output voltage accuracy?
  To optimize output voltage accuracy, use a high-precision resistor divider network for the feedback resistors (RFBT and RFBG). Choose resistors with low temperature coefficients and ensure that the resistors are properly matched. Additionally, consider using a voltage reference IC with high accuracy and low drift.
• What is the recommended input capacitor type and value?
  For the MP4350DQ-LF-Z, a low-ESR ceramic capacitor (X5R or X7R dielectric) with a value between 4.7uF to 10uF is recommended. This helps to filter out high-frequency noise and ensure stable operation.
• How do I handle the device's enable pin (EN) during power-up and power-down sequences?
  During power-up, ensure that the EN pin is pulled high after the input voltage has reached the minimum operating voltage (VIN(min)). During power-down, pull the EN pin low before the input voltage drops below VIN(min). This helps to prevent unwanted switching and ensures proper shutdown.
• What is the maximum allowed output current during a short-circuit event?
  The MP4350DQ-LF-Z has a built-in overcurrent protection (OCP) feature that limits the output current during a short-circuit event. The maximum allowed output current is typically around 2.5A to 3A, depending on the specific application and PCB design.