Class D mono amplifier with I2C volume control
The Maxim Integrated MAX9768ETG+T is a Class D mono audio amplifier delivering 10W into an 8Ω load from a 4.5V to 14V supply. It integrates I2C-controlled volume, depop circuitry, mute, and shutdown — all in a 24-TQFN (4x4 mm) package with exposed pad for thermal management. Rated for -40°C to 85°C, it suits industrial audio, panel-mount annunciators, and automotive cabin applications where a single-channel amplified output with digital volume trim is needed.
What the ratings mean for the BOM
The 10W into 8Ω rating is the headline — enough for a small bookshelf speaker or a dedicated voice-alarm channel. The I2C volume control (part of the feature set) means you can drop a separate digital potentiometer or DAC from the BOM; the depop circuit eliminates the thump on power-up or mute release, saving an external mute relay or soft-start capacitor. The 4.5V minimum supply lets it run from a 5V rail, while the 14V ceiling covers unregulated automotive supplies with headroom. The exposed pad (24-TQFN) demands a thermal via pattern under the part — plan for that in the PCB layout, not an afterthought.
Lifecycle and sourcing reality
The MAX9768ETG+T carries an Active lifecycle status and is ROHS3 compliant. For a BOM line that needs a mono Class D amp with I2C control, this is a current-production choice with no near-term obsolescence risk.
