The MAX9718/MAX9719 differential input audio power amplifiers 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. The MAX9718 is a single-channel amplifier while the MAX9719 is a dual-channel amplifier for stereo systems. 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 devices are available as adjustable gain amplifiers or with internally fixed gains of 0dB, 3dB, and 6dB to reduce component count. A shutdown input disables the bias generator and amplifiers and reduces quiescent current consumption to less than 100nA. The MAX9718 shutdown input can be set as active high or active low. These devices feature Maxim’s comprehensive click-and-pop suppression circuitry that reduces audible clicks and pops during startup and shutdown. The MAX9718 is pin compatible with the LM4895, and is available in 9-bump UCSP™, 10-pin TDFN, and 10-pin μMAX® packages. The MAX9719 is available in 16-pin TQFN, 16-pin TSSOP, and 16-bump UCSP packages. Both devices operate over the -40°C to +85°C extended temperature range.
The MAX9718 and MAX9719 are differential‑input audio power amplifiers designed for portable devices with internal speakers. The MAX9718 is a single‑channel (mono) version, while the MAX9719 offers dual‑channel (stereo) operation. Both devices deliver up to 1.4 W per channel into a 4 Ω load with less than 1 % THD+N, operate from a single 2.7 V to 5.5 V supply, and include click‑and‑pop suppression and a low‑power shutdown mode.
The datasheet includes electrical characteristics, absolute maximum ratings, typical operating curves, pin descriptions, and package information for several UCSP, TDFN, μMAX, TQFN, and TSSOP options. It also outlines gain options (adjustable or fixed 0 dB, 3 dB, 6 dB), power‑supply rejection, common‑mode rejection, and thermal shutdown specifications.
| Supply Voltage Range | 2.7 V to 5.5 V |
|---|---|
| Output Power (4 Ω load) | 1.4 W per channel, <1 % THD+N |
| Gain Options | Adjustable or fixed 0 dB, 3 dB, 6 dB |
| Power‑Supply Rejection Ratio (PSRR) | -93 dB at 217 Hz |
The devices operate from a single supply voltage of 2.7 V to 5.5 V.
The MAX9718 can deliver 1.4 W continuous average power per channel into a 4 Ω load with less than 1 % THD+N.
Yes, the amplifiers are offered with adjustable gain or fixed gains of 0 dB, 3 dB, and 6 dB.