MAX9712 is a single-channel D class audio power amplifier that delivers Class AB amplifier performance with Class D efficiency, conserving board space and extending battery life. Using a class D architecture, the MAX9712 delivers up to 500mW into an 8Ω load while offering efficiencies above 85%.
The MAX9712 is a mono Class D audio power amplifier that delivers up to 500 mW into an 8 Ω load while maintaining class‑AB sound quality. It features a filter‑less architecture, high‑efficiency operation (85 % typical), low THD+N (0.01 %), and a 72 dB PSRR.
The device supports two modulation schemes—fixed‑frequency (FFM) and spread‑spectrum (SSM)—selected via the SYNC input. It is offered in three compact packages (10‑pin TDFN, 10‑pin UMAX, 12‑bump UCSP) and operates from 2.5 V to 5.5 V supply voltage across a –40 °C to +85 °C temperature range.
| Efficiency | 85 % |
|---|---|
| THD+N | 0.01 % |
| Power‑Supply Rejection Ratio (PSRR) | 72 dB at 217 Hz |
| Operating Temperature Range | -40 °C to +85 °C |
The SYNC input selects the modulation mode and frequency; SYNC = GND gives a fixed 1.1 MHz, SYNC = FLOAT gives 1.45 MHz, and SYNC = Vpp enables spread‑spectrum mode around 1.22 MHz.
Typical efficiency is 85 % and total harmonic distortion plus noise is as low as 0.01 %.