NXP provides a recommended PCB layout in the application note AN11555, which includes guidelines for component placement, routing, and thermal management to ensure optimal performance and minimize electromagnetic interference (EMI).
The input capacitor values depend on the input voltage, output voltage, and output current. NXP recommends using the capacitor selection guide in the PEMD48,115 datasheet, which provides a formula to calculate the minimum input capacitance required. Additionally, consider the capacitor's ESR, voltage rating, and temperature coefficient.
The enable pin (EN) has a maximum allowed voltage of 6V, which is not explicitly stated in the datasheet. Exceeding this voltage may damage the device. Ensure that the EN pin is not driven above 6V to prevent damage.
NXP recommends using external components to implement OVP and UVP. For OVP, use a voltage supervisor IC or a zener diode to detect overvoltage conditions. For UVP, use a voltage supervisor IC or a resistive divider network to detect undervoltage conditions. The application note AN11555 provides more detailed information on implementing OVP and UVP.
The thermal derating curve is not provided in the datasheet, but it can be found in the NXP Power Management Guide, which provides a general thermal derating curve for power management devices. The curve shows the maximum allowed power dissipation versus ambient temperature.
PEMD48,115 datasheet
by NXP Semiconductors
