1.4W mono Class AB in a 3x3 TDFN — what it means for a portable audio BOM
The MAX9716ETA+T is a Class AB mono audio amplifier from Maxim Integrated, delivering 1.4W into a 4Ω load from a single supply spanning 2.7V to 5.5V. That supply range covers a single-cell Li-ion battery (3.0V–4.2V) as well as regulated 3.3V or 5V rails, so it fits into portable speakers, handheld radios, and battery-powered alarm systems without a separate audio rail. The 8-TDFN (3x3 mm) exposed-pad package keeps the board footprint small, and the thermal pad needs a via stitch to the ground plane to carry the heat at continuous 1.4W output.
Differential inputs and depop — why they matter for the audio path
Differential inputs reject common-mode noise picked up on long audio traces or from a noisy digital supply, which is useful when the amplifier shares a PCB with a microcontroller or Bluetooth module. The depop circuitry suppresses the audible click and pop during power-up and shutdown, so the end product doesn't thump the speaker on startup. A dedicated shutdown pin lets the system processor cut the amplifier current to near zero when audio is idle, extending battery life in duty-cycled applications.
Active lifecycle — no LTB pressure on this line item
ROHS3 compliant, no exemption issues for EU markets. The tape-and-reel (TR) and cut-tape (CT) packaging options are both available, which means prototype quantities and production reels come from the same supply chain. Store the reels dry — the exposed-pad TDFN is MSL-sensitive; bake before reflow if the moisture-barrier bag has been open past the floor-life window.