The MAX9718/MAX9719 is a audio power amplifier that is ideal for portable audio devices with internal speakers. The device features a bridge-tied load (BTL) architecture that provides high-quality, power audio amplification while minimizing external component count.
The MAX9718 and MAX9719 are low‑cost, mono/stereo differential audio power amplifiers designed for portable devices with internal speakers. They feature a bridge‑tied load architecture, single‑supply operation from 2.7 V to 5.5 V, and provide up to 1.4 W continuous average power per channel into a 4 Ω load with less than 1 % THD+N.
Both devices include a shutdown input that reduces quiescent current to below 100 nA, click‑and‑pop suppression circuitry, and options for fixed or adjustable gain. They are offered in lead‑free, RoHS‑compliant packages and operate over an extended temperature range of –40 °C to +85 °C.
| Supply Voltage (single‑supply) | 2.7 V to 5.5 V |
|---|---|
| Output Power (per channel) | 1.4 W into 4 Ω at <1 % THD+N |
| Power‑Supply Rejection Ratio (PSRR) | -93 dB at 217 Hz |
| Operating Temperature Range | -40 °C to +85 °C |
Each channel can deliver 1.4 W into a 4 Ω load while keeping total harmonic distortion plus noise below 1 %.
The shutdown input reduces quiescent current to less than 100 nA (typical 0.1 µA).
The amplifiers operate from 2.7 V to 5.5 V single‑supply, with absolute maximum ratings of –0.3 V to +6 V.
Both devices are specified for –40 °C to +85 °C.