The MAX9705 is a 3rd-generation ultra-low EMI mono Class D audio power amplifier that combines Class AB performance with Class D efficiency. It delivers 2.3W into a 4Ω load with efficiencies above 85%. The MAX9705 actively controls the output FET gate transitions to greatly reduce EMI. It also features zero dead time technology and a patented spread-spectrum modulation scheme to eliminate the need for output filtering. The MAX9705 offers fixed-frequency mode and spread-spectrum mode to further reduce EMI-radiated emissions. It can be synchronized to an external clock and supports cascading multiple MAX9705s.
The MAX9705 is a third‑generation, ultra‑low EMI, mono Class D audio power amplifier that delivers 2.3 W into a 4 Ω load while maintaining efficiencies above 85 %. It features active emissions limiting, zero dead‑time technology, and a patented spread‑spectrum modulation that eliminates the need for output filtering.
The device is offered in compact 10‑pin TDFN (3 mm × 3 mm × 0.8 mm) and 12‑bump UCSP (1.5 mm × 2 mm × 0.6 mm) packages, operates over –40 °C to +85 °C, and includes built‑in click‑and‑pop suppression, low quiescent current, and shutdown protection.
| Output Power | 2.3 W into 4 Ω load |
|---|---|
| Efficiency | >85 % |
| THD+N | 0.02 % at 1 W |
| Quiescent Current | 5.4 mA |
| Shutdown Current | 0.3 µA |
| Supply Voltage Range | 2.5 V to 5.5 V |
| Operating Temperature | -40 °C to +85 °C |
| Package Options | 10‑pin TDFN (3 mm × 3 mm × 0.8 mm) and 12‑bump UCSP (1.5 mm × 2 mm × 0.6 mm) |
The MAX9705 can deliver 2.3 W into a 4 Ω load.
It operates from a supply voltage of 2.5 V to 5.5 V.
The device is offered in a 10‑pin TDFN (3 mm × 3 mm × 0.8 mm) and a 12‑bump UCSP (1.5 mm × 2 mm × 0.6 mm) package.
The amplifier achieves efficiencies above 85 %.