The MAX9742 is a 16W, Class D stereo amplifier from MAXIM that operates from a single or dual supply. The maximum output power is 2 x 16W into a 4Ω load and the input impedance is fully differential. The MAX9742 features a variety of protection functions, including short-circuit and thermal overload protection. It is also available in a space-saving 36-pin TQFN package.
The MAX9742 stereo Class‑D audio power amplifier provides up to 2 × 16 W output into 4 Ω loads while maintaining high efficiency (up to 92 % with 8 Ω loads). It operates from a single 20‑40 V supply or a dual ±10‑±20 V supply and includes features such as fully differential inputs, click‑and‑pop suppression, low‑power shutdown mode, and externally adjustable gain.
The device is offered in a compact 36‑pin TQFN package (6 mm × 6 mm × 0.8 mm) and is rated for an extended temperature range of –40 °C to +85 °C. Protection mechanisms include short‑circuit and thermal‑overload protection, and the datasheet provides detailed electrical characteristics, typical operating curves, and application circuit examples.
| Efficiency | up to 92 % (8 Ω load) |
|---|---|
| Supply Voltage Range | 20‑40 V single‑supply or ±10‑±20 V dual‑supply |
| Operating Temperature | -40 °C to +85 °C |
| Package | 36‑pin TQFN (6 mm × 6 mm × 0.8 mm) |
It operates from a single 20‑40 V supply or a dual ±10‑±20 V supply.
Yes, it includes a low‑power shutdown mode with a shutdown current of 0.8‑1.3 mA.
The amplifier reaches up to 92 % efficiency when driving an 8 Ω load.