Despite its small size, the ISL8203M is thermally efficient. It is able to conduct any heat present from switching loss directly to the PCB through the bottom of the package. This means that with a full 6A output at 2.5V, providing a 15W output, the device will see a case temperature of 65.8°C while running at room temperature with no airflow. This equates to a theta JA of 17°C/W. The advantage is the user can run this device at maximum ambient temperature, 85°C full load without the need for air flow, therefore no heat sinking is required for this product.