Panasonic recommends a 4-layer PCB with a solid ground plane and a separate power plane for the AXT338124. The input and output capacitors should be placed as close as possible to the IC, and the PCB traces should be kept short and wide to minimize inductance and resistance.
The AXT338124 has a thermal pad on the bottom of the package, which should be connected to a thermal plane on the PCB. A thermal interface material (TIM) can be used to improve heat transfer between the IC and the PCB. Additionally, ensure good airflow around the device and consider using a heat sink if necessary.
Panasonic recommends using a low-ESR ceramic capacitor with a value of 10uF to 22uF for the input capacitor. The capacitor should be rated for the input voltage and have a low impedance at high frequencies to ensure stable operation.
Check the PCB layout for any signs of resonance or oscillation, such as ringing on the output voltage. Ensure that the input and output capacitors are properly selected and placed, and that the PCB traces are short and well-decoupled. Also, verify that the device is operated within its recommended operating conditions and that the input voltage is stable.
The maximum allowed output current for the AXT338124 is 2A. However, the device can deliver higher currents for short periods of time. It's essential to ensure that the output current does not exceed the maximum rating for an extended period to prevent overheating and damage to the device.
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AXT338124 Overview
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