MAX98425AEWL+T

MAX98425AEWL+T is a high-efficiency, stereo Class-D speaker amplifier with industry-leading quiescent power featuring Envelope Tracking control, Brownout Prevention Engine (BPE), Dynamic Headroom Tracking (DHT), and RMS Limiter. It supports sample rates up to 192kHz and a higher passband (for fS > 50kHz) to enable high-resolution audio and ultrasound use cases. A separate bypass path is available for inputs, such as an ultrasound signal, so that it is not attenuated by audio processing. SSM and edge rate control minimize EMI and eliminate the need for output filtering found in traditional Class-D devices. The Envelope Tracking algorithm on the device monitors the incoming audio signal and generates a PWM signal to control an external DC-DC converter to keep the amplifier supply close to the peak output audio signal, thereby improving system efficiency, idle quiescent power consumption, and thermal efficiency.

• Wide input supply range from 3V to 22V
• Ultra-low quiescent power of 89mW at VPVDD = 14V
• Ultra-low 28.5μVRMS output noise
• Low distortion of -81.1dB THD+N at 2W into 8ohm, f = 1kHz
• Output power at 1% THD+N: 28W stereo into 8ohm, VPVDD = 22V, 20.5W into 4ohm, VPVDD = 14V
• Speaker amplifier efficiency: 87.5% at 1W/ch into 8Ω, VPVDD = 22V, 88% at 1W/ch into 4Ω, VPVDD = 14V
• Class-D EMI reduction enables filterless operation
• SSM and switching edge rate control
• Flexible brownout prevention engine
• I2S/16-channel TDM and I2C digital Interfaces, No MCLK required, dynamic headroom tracking