The TAS2505IRGET is a mono Class D audio amplifier from Texas Instruments that delivers 2W into a 4Ω load from a single 1.5V to 1.95V supply. It integrates I²C control for volume adjustment, a shutdown pin for power saving, and thermal protection. The 24-VQFN package with exposed pad (4x4 mm) is surface-mount and hand-solderable with care — a fine-tip iron and flux work, but a hot-air station is cleaner for the pad. This part is aimed at portable or battery-powered audio gear — think Bluetooth speakers, soundbars, or handheld radios — where efficiency and small footprint matter.
Output power and load considerations
Rated at 2W into 4Ω, this is a modest output — enough for a small speaker in a portable device. The Class D topology keeps efficiency high, so heat dissipation in the 4x4 mm QFN is manageable with the exposed pad soldered to a ground plane. No external output filter is required for typical speaker loads; the modulation scheme is designed for direct speaker drive. If you're driving a piezo tweeter or long cable runs, add a ferrite bead and a small capacitor to suppress EMI.
The thermal protection circuit shuts down the output if the die exceeds the safe limit, so a dead-shorted speaker won't destroy the part — it'll cycle until the fault clears.