The MAX9708 mono/stereo, Class D audio power amplifier delivers up to 2 x 21W into an 8Ω stereo mode and 1 x 42W into a 4Ω load in mono mode while offering up to 87% efficiency. The MAX9708 provides Class AB amplifier performance with the benefits of Class D efficiency, eliminating the need for a bulky heatsink and conserving power. The MAX9708 operates from a single +10V to +18V supply, driving the load in a BTL configuration. The MAX9708 offers two modulation schemes: a fixed-frequency modulation (FFM) mode, and a spread-spectrum modulation (SSM) mode that reduces EMI-radiated emissions. The MAX9708 can be synchronized to an external clock from 600kHz to 1.2MHz. A synchronized output allows multiple units to be cascaded in the system. Features include fully differential inputs, comprehensive click-and-pop suppression, and four selectable-gain settings (22dB, 25dB, 29.5dB, and 36dB). A pin-programmable thermal flag provides seven different thermal warning thresholds. Short-circuit and thermal-overload protection prevent the device from being damaged during a fault condition. The MAX9708 is available in 56-pin TQFN (8mm x 8mm x 0.8mm) and 64-pin TQFP (10mm x 10mm x 1.4mm) packages, and is specified over the extended -40°C to +85°C temperature range.
The MAX9708 mono/stereo Class D audio power amplifier provides high efficiency and compact packaging. It operates from a single +10 V to +18 V supply and offers two modulation schemes—fixed‑frequency and spread‑spectrum—to reduce EMI.
The device includes fully differential inputs, programmable gain (22 dB‑36 dB), thermal‑flag monitoring, and protection features such as short‑circuit and thermal overload. It is available in 56‑pin TQFN and 64‑pin TQFP packages and is specified for -40 °C to +85 °C operation, making it suitable for LCD/PDP TVs, automotive PC/Hi‑Fi audio, and other consumer electronics.
| Stereo Output Power | 2 × 21 W into 8 Ω |
|---|---|
| Mono Output Power | 1 × 42 W into 4 Ω |
| Efficiency | up to 87 % |
| Supply Voltage Range | +10 V to +18 V |
| Operating Temperature Range | -40 °C to +85 °C |
| Gain Settings | 22 dB, 25 dB, 29.5 dB, 36 dB |
| Modulation Schemes | Fixed‑frequency (FFM) and Spread‑Spectrum (SSM) |
The MAX9708 can deliver up to 2 × 21 W into an 8 Ω load in stereo mode.
It operates from a single +10 V to +18 V supply.
Four selectable gain settings are provided: 22 dB, 25 dB, 29.5 dB, and 36 dB.
The device includes short‑circuit and thermal‑overload protection, plus a programmable thermal‑flag output.