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SSM3515 31 W, Filterless, Class-D Digital Input Audio Amplifier

The SSM3515 is a fully integrated, high efficiency, mono Class-D audio amplifier with digital inputs. The application circuit requires a minimum of external components and can operate from a single 4.5 V to 17 V supply. It can deliver 8.4 W of output power into an 8 Ω load or 15.8 W into an 4 Ω load from a 12 V power supply, or 31.3 W into an 4 Ω load from a 17 V power supply, all with 1% THD + N. The SSM3515 features a high efficiency, low noise modulation scheme that requires no external LC output filters. This scheme provides high efficiency even at low output power. It operates with 92% efficiency at 7 W into an 8 Ω load or 88% efficiency at 15 W into 4 Ω from a 12 V supply. Spread spectrum pulse density modulation provides lower EMI radiated emissions compared with other Class-D architectures, particularly above 100 MHz. The digital input eliminates the need for an external digital-to-analog converter (DAC). The SSM3515 has a micropower shutdown mode with a typical shutdown current of 39 nA at the 12 V PVDD supply. The device also includes pop and click suppression circuitry that minimizes voltage glitches at the output during turn on and turn off. The SSM3515 operates with or without an I2C control interface. The SSM3515 is specified over the commercial temperature range (−40°C to +85°C). It has built in thermal shutdown and output short-circuit protection. It is available in a halide-free, 20-ball, 1.8 mm × 2.2 mm wafer-level chip scale package (WLCSP). Applications

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