If the output power is higher than 10 W, the TSOT23 package might reach its thermal limit. The AOZ6662 and AOZ6663 provide a highly efficient thermal package to deliver output power up to 20 W. For example, the output power is 15 W for a 5 V output at a 3 A load. As can be seen from the thermal images on this slide, the DFN3x3 package has much cooler operation than the TSOT23 package for the same output power; the difference is almost 37°C. Alpha & Omega Semiconductor offers both package types for customers to choose.