The UTC PA3427 is a stereo audio speaker operated on a single 5V supply. It is capable of delivering 2W of output power per channel in Bridge-Tied Load mode into 4 load with less than 1% THD+N. Two terminals (GAIN0 and GAIN1) can configure and control the amplifier gain. In order to simplify the design of audio system in the notebook application, the two modes of Bridge-Tied Load (BTL) and Single-End (SE) mode drive the speakers and headphone respectively. The UTC PA3427 supports two input paths to choose two different amplitude AC signals through setting HP/ LINE pin. The UTC PA3427 is suitable for applications, such as stereo power amplifiers of notebooks or desktop computers, and multimedia monitors.