Designers of portable and battery-powered audio devices face the challenge of delivering high-quality sound while maintaining ultra-low power consumption. Analog Devices’ MAX98415A and MAX98425A stereo Class-D audio amplifiers provide an advanced solution tailored to these needs.

Low Power Consumption with Smart Energy Saving

Both amplifiers feature an ultra-low idle current of just 6mA and support microamp shutdown mode, significantly extending battery life. Their built-in envelope tracking control technology intelligently instructs an external DC-DC converter to supply only the voltage needed for clean audio output, minimizing unnecessary power usage.

Advanced Speaker Protection in MAX98415A

The MAX98415A includes additional hardware blocks, such as voltage feedback and current sense ADC, which gather real-time data and transmit it to an external MCU. This enables sophisticated speaker protection algorithms, enhancing product safety and reliability.

Outstanding Audio Performance and Output Power

• The MAX98415A delivers up to 27W stereo output into 8Ω at 22V, and 19W into 4Ω at 14V.

• The MAX98425A outputs approximately 1W per channel under similar conditions.

• Both ICs achieve an impressively low THD+N of -81.1 dB at 2W into 8Ω, 1kHz, ensuring pristine audio quality.

Intelligent Power and Protection Features

• Dynamic Headroom Tracking: Monitors main power rail voltage and compresses or limits audio signals during voltage dips to prevent audible artifacts.

• Brown-Out Prevention: Designed for battery-powered systems, it detects deep supply drops and temporarily reduces current draw to stabilize the power rail.

• Thermal Fold-Back: Automatically lowers output power when temperature exceeds preset thresholds, enabling continuous playback in high-temperature environments.

Flexible Multi-Rail Power Supply

These devices require four power rails: 1.8V for digital logic, 1.8V for internal analog, 2.4–5.5V for battery input (no integrated charger), and 3–22V for the output stage, providing adaptability for diverse design requirements.

Compact Packaging for Easy Integration

Encased in a tiny 3.4mm × 2.2mm 40-bump Wafer-Level Package (WLP), these amplifiers save PCB space and suit modern compact electronic designs.

Conclusion

The MAX98415A and MAX98425A offer exceptional audio quality, power efficiency, and intelligent protection features, making them ideal for portable speakers, smart home lighting, and other applications requiring high-performance audio amplification.

Contact us to learn more about technical specifications, sample availability, and tailored solutions to elevate your next product design.