The MAX98400A/MAX98400B are high-performance, thermally efficient stereo, high-power, Class D amplifiers
The MAX98400A/MAX98400B Class D amplifiers provide high‑performance, thermally efficient audio amplification. They operate from a single 8 V to 28 V supply, offer up to 90 % efficiency, and include integrated limiting, click‑and‑pop suppression, and robust over‑current protection.
Both devices are available in TQFN packages (36‑pin for MAX98400A, 24‑pin for MAX98400B) and are specified for the –40 °C to +85 °C temperature range. Thermal‑foldback can be enabled to reduce output power above +120 °C, and traditional thermal protection is also provided.
| Supply Voltage Range | 8 V to 28 V |
|---|---|
| Efficiency | up to 90 % |
| Power‑Supply Rejection Ratio (PSRR) | 67 dB |
| Thermal Foldback Activation Temperature | +120 °C |
| Package Type | MAX98400A – 36‑pin TQFN; MAX98400B – 24‑pin TQFN |
Both devices operate from a single 8 V to 28 V supply.
Yes, it has a thermal‑foldback feature that reduces power above +120 °C and also provides traditional thermal protection.
They achieve up to 90 % efficiency when powered from a 12 V supply.