The MAX9744 is a 20W stereo Class D audio power amplifier that provides Class AB amplifier performance with Class D efficiency. It features single-supply operation, adjustable gain, shutdown mode, a SYNC output, speaker mute, and industry-leading click-and-pop suppression. The MAX9744 features a 64-step dual-mode (analog or digital), programmable volume control and mute function. It operates from a 4.5V to 14V single supply and can deliver up to 20W per channel into a 4Ω speaker with a 14V supply. The MAX9744 offers two modulation schemes: a fixed-frequency modulation mode that allows one of several preset switching frequencies to be selected, and a spread-spectrum modulation mode that helps to reduce EMI-radiated emissions. The MAX9744 features high 75dB PSRR, low 0.04% THD+N, and SNR in excess of 90dB. Robust short-circuit and thermal-overload protection prevent device damage during a fault condition.
The MAX9744 is a 20 W stereo Class D audio power amplifier that delivers Class AB performance with Class D efficiency. It operates from a single 4.5 V to 14 V supply, provides integrated volume control (I²C or analog), speaker mute, shutdown mode, and click‑and‑pop suppression. The device includes robust short‑circuit and thermal‑overload protection and is offered in a 44‑pin thin QFN‑EP package (7 mm × 7 mm × 0.8 mm).
The datasheet lists detailed electrical characteristics, including supply‑voltage rejection ratio, THD+N as low as 0.04 %, efficiency up to 93 %, and an operating temperature range of –40 °C to +85 °C. Typical performance graphs show output power, efficiency, and distortion versus load, supply voltage, and frequency for both filter‑less spread‑spectrum and fixed‑frequency modulation modes.
| Supply Voltage Range | 4.5 V to 14 V |
|---|---|
| Maximum Output Power | 20 W per channel into 4 Ω |
| THD+N | 0.04 % (typ) |
| Efficiency | up to 93 % |
| Power‑Supply Rejection Ratio (PSRR) | 75 dB |
| Operating Temperature Range | -40 °C to +85 °C |
| Package | 44‑pin thin QFN‑EP (7 mm × 7 mm × 0.8 mm) |
| Protection Features | Short‑circuit and thermal‑overload protection |
It operates from a single supply voltage between 4.5 V and 14 V.
The device can deliver up to 20 W per channel into a 4 Ω speaker.
It includes short‑circuit and thermal‑overload protection to prevent damage.
Typical total harmonic distortion plus noise is as low as 0.04 %.