This document describes the features and characteristics of the 2 × 2W filterless Class-D stereo audio amplifier SSM2356. It has high efficiency, low distortion, and single-supply operation, making it suitable for applications such as mobile phones, MP3 players, and portable gaming devices.
The SSM2356 is a fully integrated stereo Class‑D audio amplifier designed for mobile and portable electronics. It operates from a single 2.5 V to 5.5 V supply, delivers up to 2 W per channel into 4 Ω loads, and features built‑in pop‑and‑click suppression, short‑circuit and thermal protection, and a shutdown current of only 20 nA.
The device includes a functional block diagram, pin‑out description, absolute maximum ratings, thermal resistance data, and typical performance curves. Specifications such as output power, efficiency, gain selection (6 dB or 18 dB), SNR (>103 dB) and supply current are provided, along with ordering information for the 16‑ball WLCSP package.
| Output Power (per channel) into 8 Ω | 1.4 W |
|---|---|
| Output Power (per channel) into 4 Ω | 2 W |
| Efficiency (normal mode) | 92 % |
| Gain selection | 6 dB or 18 dB |
| Shutdown current | 20 nA |
| Signal‑to‑noise ratio | >103 dB |
| Supply voltage range | 2.5 V to 5.5 V |
The SSM2356 delivers 2 W per channel into a 4 Ω load at a 5 V supply with less than 1 % THD+N.
Gain is set via the GAIN pin, allowing a selection of either 6 dB or 18 dB.
The typical shutdown current is 20 nA.
It operates from a single supply of 2.5 V to 5.5 V.