The AAT5101 is a high efficiency, 2.5W mono class Daudio power amplifier. The low noise, filterless PWMarchitecture eliminates the output filter, reduces theexternal component count and system cost, and simplifiessystem design. With high efficiency of up to 92% and the industry lowest 1.35mA quiescent current, it increasesbattery lifetime and dramatically lowers the junctiontemperature. The space saving wafer-level chip scalepackage (WLCSP) and minimum external componentrequirements make it ideal for cellular phones andPDAs.