The SSM2304 features a high efficiency, low noise modulation scheme. It operates with 85% efficiency at 2 W into 4 from a 5.0 V supply and has a signal-to-noise ratio (SNR) that is better than 95 dB. PDM modulation is used to provide lower EMIradiated emissions compared with other Class-D architectures. The SSM2304 has a micropower shutdown mode with a typical shutdown current of 20 nA. Shutdown is enabled by applying a logic low to the SD pin.