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. Using a Class D architecture, these devices deliver up to 15W while offering up to 78% efficiency. Proprietary and patent-protected modulation and switching schemes render the traditional Class D output filter unnecessary. The MAX9703/MAX9704 offer two modulation schemes: a fixed-frequency mode (FFM), and a spread-spectrum mode (SSM) that reduces EMI-radiated emissions due to the modulation frequency. The device utilizes a fully differential architecture, a full bridged output, and comprehensive click-and-pop suppression. The MAX9703/MAX9704 feature high 80dB PSRR, low 0.07% THD+N, and SNR in excess of 95dB. Short-circuit and thermal-overload protection prevent the devices from being damaged during a fault condition. The MAX9703 is available in a 32-pin TQFN (5mm x 5mm x 0.8mm) package. The MAX9704 is available in a 32-pin TQFN (7mm x 7mm x 0.8mm) package. Both devices are specified over the extended -40°C to +85°C temperature range.
The MAX9703 (mono) and MAX9704 (stereo) are filter‑less Class D audio power amplifiers that deliver Class AB performance with high efficiency. They operate from a single 10 V‑25 V supply, provide up to 15 W (MAX9703) or 2 × 10 W (MAX9704) continuous output into 8 Ω loads, and feature spread‑spectrum modulation to reduce EMI.
These devices include built‑in short‑circuit and thermal‑overload protection, low quiescent current (24 mA), and a low‑power shutdown mode (0.2 µA). They offer high PSRR (80 dB at 1 kHz), low THD+N (0.07 %), and up to 78 % efficiency, making them suitable for compact audio applications such as LCD TVs, monitors, and automotive infotainment systems.
| Supply Voltage Range | 10 V to 25 V |
|---|---|
| THD+N | 0.07 % |
| Quiescent Current | 24 mA |
| Efficiency | Up to 78 % (RL = 8 Ω) |
| Protection Features | Short‑circuit and thermal‑overload protection |
The devices operate from a single supply of 10 V to 25 V.
They include short‑circuit and thermal‑overload protection to prevent damage.
The MAX9704 can achieve up to 78 % efficiency when driving an 8 Ω load.