Class D amplifier for mono or stereo audio — 35W into 4Ω
Built-in depop, mute, short-circuit protection, and thermal shutdown reduce the external component count and improve system reliability. The output can be configured as a single mono channel or a stereo pair, letting one BOM line serve multiple product variants.
Active production — no end-of-life risk on this BOM line
There is no last-time-buy notice or obsolescence risk for new designs. If you need a reel variant, the MAX9736AETJ+T is the tape-and-reel version of the same die; the +T suffix is the only difference.
32-TQFN exposed pad — thermal and layout notes
The 32-TQFN (7x7 mm) package has an exposed pad on the bottom that must be soldered to a PCB ground plane for thermal management. At 35W output, the Class D efficiency (typically >85%) still dissipates several watts as heat — the exposed pad is the primary thermal path. Without a proper thermal via array under the pad, the part will hit thermal shutdown under sustained high-power operation. The datasheet layout recommendation calls for a solid copper pour on the top layer, stitched with vias to the inner ground plane. Keep the output filter inductor and bypass capacitors close to the package to minimize radiated EMI from the switching output stage.