A thermal pad is recommended under the IC, and a 2-layer or 4-layer PCB with a solid ground plane is suggested to reduce thermal resistance. Additionally, keeping the PCB layout symmetrical and avoiding thermal vias under the IC can help improve thermal performance.
To ensure reliable operation at high temperatures, it's essential to follow the recommended operating conditions, including derating the output current and voltage according to the temperature derating curve. Additionally, using a heat sink or thermal interface material can help reduce the junction temperature.
The maximum allowed voltage on the enable pin is typically limited to the supply voltage (VIN) or 5.5V, whichever is lower. Exceeding this voltage may damage the internal circuitry.
While the ZM4744A is designed for low-frequency switching applications, it can be used in high-frequency switching applications with proper design considerations. However, the switching frequency should be limited to 100 kHz or lower to avoid excessive power losses and ensure reliable operation.
To minimize EMI, it's recommended to use a shielded inductor, keep the PCB layout compact, and use a common-mode choke or EMI filter on the input and output lines. Additionally, using a spread-spectrum clock or frequency hopping can help reduce EMI emissions.
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