Class D mono amplifier — 20 W into 4 Ω, active and available
The Texas Instruments TAS5720MRSMT is a Class D audio amplifier delivering 20 W into a 4 Ω load from a single mono channel. It runs on a 4.5 V to 26.4 V supply rail, making it a fit for consumer active speakers, soundbars, and automotive aftermarket audio boards where a single-ended supply and a compact footprint matter. The 32-VQFN (4x4 mm) package with exposed pad keeps thermal management straightforward — the pad is the primary heat path, so a via-stitched ground plane on the PCB is the expected mounting practice.
Protection features and operating range
On-chip short-circuit and thermal protection are included — the amplifier shuts down before the output stage or the load sees damage from a faulted speaker line or a stalled cooling path. The operating temperature span is -25°C to 85°C ambient, which covers most indoor and equipment-chassis environments but not extended industrial or under-hood automotive without derating. Depop circuitry suppresses the startup pop that otherwise couples into the speaker, so the BOM can skip an external muting relay or delayed-enable circuit.
Lifecycle and sourcing reality
TI lists the TAS5720MRSMT as Active with ROHS3 compliance. No NRND or last-time-buy notice is recorded, so it remains a valid choice for new designs and production replenishment.