MAX98390 5 W Digital, Boosted Class D Amplifier wi

By Maxim Integrated 179

MAX98390 5 W Digital, Boosted Class D Amplifier wi

Maxim's MAX98390 is a high-efficiency mono Class-D DSM smart amplifier that features an integrated boost converter, integrated DSM, and FET scaling for higher efficiency at low output power. The maximum boost converter output voltage is programmable from 6.5 V to 10 V in 0.125 V increments from a battery voltage as low as 2.65 V. The boost converter supports bypass mode for lower quiescent current and improved mid-power efficiency as well as envelope tracking which automatically adjusts the output voltage for maximum efficiency. The boosted supply efficiently delivers up to 6.2 W at 10% THD+N into a 4 Ω load.

Integrated IV sense and DSM allows louder, fuller audio while protecting the speaker against damage and improving sound quality. The PCM interface supports I2S, left-justified, and 16-channel TDM formats as a slave or master device with I2C control. Either BCLK or MCLK can be used as the internal clock source providing system level flexibility.

Thermal and other status data can also be read from the I2C interface. Patented active emissions limiting edge rate and overshoot control circuitry minimizes EMI and eliminates the need for output filtering found in traditional Class-D devices.

A flexible brownout-detection engine (BDE) can be programmed to initiate various current limiting, signal limiting, and clip functions to prevent dips in battery voltage. Threshold, hysteresis, and attack-and-release rates are programmable.

  • Louder and deeper sound quality: delivers up to 2.5x loudness (sound pressure level) and up to two octaves deeper bass versus conventional 5 V amplifiers in a small form factor
  • Ease of use: includes Maxim's DSM Sound Studio software GUI, which enables designers to clearly hear the DSM difference in minutes with the quick demo feature, and easily characterize and prototype with their own speakers, significantly reducing design time and work
  • Industry-leading power consumption: features lowest quiescent power in the market with ~24 mW; offers peak efficiency of 86 percent with boosted Class-D amplifier; and further improves efficiency by up to 25 percent with no loss in audio fidelity with Maxim's DSM PPR feature
  • Designed for manufacturability: on-chip DS resistance (RDC) testing can be used on the production line for quality assurance to ensure the speaker is within impedance tolerance
  • IoT devices
  • Notebook computers
  • Single Li-ion cell devices
  • Smartphones
  • Tablets
  • Toys
  • DSM Sound Studio
  • PUI Audio Customer Testimonial
  • Video: Is DSM a Fit for My System?
  • Video: Micro Speaker 101