The MAX9703/MAX9704 mono/stereo Class D audio power amplifiers provide Class AB amplifier performance with Class D efficiency, conserving board space and eliminating the need for a bulky heatsink.
The MAX9703 (mono) and MAX9704 (stereo) are filter‑less Class D audio power amplifiers that deliver Class AB performance with high efficiency, up to 78%‑88% depending on load. They feature a unique spread‑spectrum modulation mode that reduces EMI emissions and a differential input architecture that minimizes common‑mode noise.
These devices are offered in compact 32‑pin TQFN packages (5 mm×5 mm×0.8 mm for MAX9703, 7 mm×7 mm×0.8 mm for MAX9704) and operate over a temperature range of –40 °C to +85 °C. Typical applications include LCD TVs, monitors, projectors, automotive audio, and handheld devices.
| Continuous Output Power (Mono) | 15 W into 8 Ω |
|---|---|
| Efficiency (Stereo, RL=16 Ω) | Up to 88 % |
| THD+N | 0.07 % |
| Quiescent Current | 24 mA |
The MAX9704 can achieve up to 88 % efficiency when loaded with 16 Ω.
Both devices can reach a total harmonic distortion plus noise of as low as 0.07 %.
Both amplifiers are specified for operation from –40 °C to +85 °C.