A good PCB layout for FMMT458TC involves keeping the input and output traces separate, using a ground plane, and minimizing lead lengths. A 4-layer PCB with a dedicated ground plane is recommended. Additionally, the device should be placed close to the power source to reduce voltage drops.
To ensure proper biasing, the FMMT458TC requires a minimum of 1.5V on the enable pin (EN) to turn on the device. The input voltage (VIN) should be within the recommended range of 2.5V to 5.5V. Additionally, the output voltage (VOUT) should be set to the desired level using an external resistor divider network.
The maximum current rating for the FMMT458TC is 1A. However, it's recommended to derate the current to 0.8A for continuous operation to ensure reliability and prevent overheating.
To protect the FMMT458TC from overvoltage and undervoltage conditions, it's recommended to use an external voltage supervisor or a voltage monitor IC to detect and respond to voltage faults. Additionally, a TVS diode can be used to protect the device from voltage transients and spikes.
The thermal resistance of the FMMT458TC package is typically around 50°C/W. This means that for every watt of power dissipated, the junction temperature will rise by 50°C above the ambient temperature.
