Designers of audio systems for portable and desktop applications can reduce pin counts by 50% and overall system costs by as much as 40% with the TPA2000D2, reportedly the industry's first filterless Class-D audio power amplifier. Typical applications for the device include notebook PCs, PDAs, portable DVD players, and USB multimedia speakers. This stereo Class-D audio power amp can deliver 2Wrms or 4W peak into 4 ohm speakers. The 5V device is designed to consume less power and dissipate less heat than traditional Class-AM linear audio amps. In addition to operating without a filter, the TPA2000D2 audio amp conserves pc board space by reducing external resistor count via four internal gain settings. And the IC's low noise characteristics improve fidelity while its shutdown controls help prolong battery charge life by limiting the total supply current to less than 1 µA. In a 24-pin TSSOP package, the audio amplifier is priced at $2.50 each/1000.