The MAX9718/MAX9719 are differential input audio power amplifiers that are ideal for portable audio devices with internal speakers. The differential input structure improves noise rejection and provides common-mode rejection. A bridge-tied load (BTL) architecture minimizes external component count, while providing high-quality, power audio amplification. Both devices deliver 1.4W continuous average power per channel to a 4Ω load with less than 1% THD+N while operating from a single +5V supply.
The MAX9718 (single‑channel) and MAX9719 (dual‑channel) differential input audio power amplifiers are designed for portable audio devices with internal speakers. They feature a bridge‑tied load architecture, click‑and‑pop suppression, and a shutdown input that reduces quiescent current to less than 100 nA. Both devices operate from a single +5 V supply and are available in several compact packages.
Key specifications include 1.4 W continuous output power per channel into a 4 Ω load, less than 1 % THD+N, -93 dB PSRR at 217 Hz, and an operating temperature range of –40 °C to +85 °C. The amplifiers are pin‑compatible with the LM4895 and support adjustable or fixed gain options.
| Output Power | 1.4 W per channel |
|---|---|
| Supply Voltage Range | -0.3 V to +6 V (absolute max) |
| Power‑Supply Rejection Ratio (PSRR) | -93 dB at 217 Hz |
| Total Harmonic Distortion + Noise (THD+N) | < 1 % at 1 kHz into 8 Ω |
| Operating Temperature Range | -40 °C to +85 °C |
| Logic Input Compatibility | 1.8 V logic compatible |
| Package Options | 9‑bump UCSP, 10‑pin TDFN, 10‑pin uMAX, 16‑pin TQFN, 16‑pin TSSOP |
| Pin Compatibility | Pin compatible with LM4895 |
Each channel can deliver 1.4 W continuous average power into a 4 Ω load with less than 1 % THD+N.
The absolute maximum supply voltage is –0.3 V to +6 V, while normal operation is from 2.7 V to 5.5 V single‑supply.
Yes, the MAX9718 is pin compatible with the LM4895.