The TPA6040A4 is a stereo audio power amplifier and DirectPath™ headphone amplifier in a thermally enhanced, space-saving, 32-pin QFN package. The speaker amplifier is capable of driving 2 W per channel continuously into 4-Ω loads at 5 V. The headphone amplifier achieves a minimum of 85 mW at 1% THD+N from a 5-V supply. It has a built-in 4-step volume control, minimizing the need for external components. It also features independent shutdown control and dedicated inputs for the speaker and headphone amplifiers.
The TPA6040A4 is a 2‑W stereo audio power amplifier in a 32‑pin QFN package that also provides a DirectPath™ headphone amplifier. It delivers up to 2 W per channel into 4‑Ω speakers and 85 mW into 16‑Ω headphones from a 5 V supply, with selectable speaker gain steps of 6, 10, 15.6 and 21.6 dB and a fixed –1.5 V/V headphone gain. Independent shutdown controls allow separate enable of the speaker, headphone and LDO regulator.
The device is supplied in a thermally‑enhanced QFN (RHB) package, with detailed terminal functions for speaker and headphone paths, bias control, and a 4.75‑V low‑dropout regulator. Electrical specifications include a recommended supply voltage of 4.5‑5.5 V, THD+N of 1 % at 1 kHz into 4‑Ω loads, and a PSRR of –60 dB. The data sheet also provides absolute‑maximum ratings, dissipation limits, and typical performance curves.
| Supply voltage (VDD, SPVDD) | 4.5 V – 5.5 V |
|---|---|
| Speaker gain steps | 6, 10, 15.6, 21.6 dB |
| Headphone gain | -1.5 V/V (fixed) |
| LDO regulator output | 4.75 V |
| THD+N (speaker) | 1 % at 1 kHz, 4‑Ω |
| PSRR (speaker) | -60 dB |
The device is recommended to be powered from 4.5 V to 5.5 V.
Four selectable gain steps are available: 6 dB, 10 dB, 15.6 dB and 21.6 dB.