2 ×10 W Filterless Class-D

Stereo Audio Amplifier

Data Sheet

SSM3302

Rev. 0

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FEATURES

Filterless stereo Class-D amplifier with Σ-Δ modulation

2 × 10 W into 4 Ω load and 2 × 8 W into 8 Ω load at 12 V supply

with <1% total harmonic distortion plus noise (THD + N)

91% efficiency at 12 V, 8 W into 8 Ω speaker

98 dB signal-to-noise ratio (SNR)

Single-supply operation from 7 V to 18 V

Flexible gain adjustment pin from 9 dB to 24 dB

Fixed input impedance of 40 kΩ

Mono output mode pin for 1 × 20 W output power into 2 Ω

10 µA shutdown current

Short-circuit and thermal protection

Available in a 40-lead, 6 mm × 6 mm LFCSP

Pop-and-click suppression

User-selectable ultralow EMI emissions mode

Thermal warning indicator

Power-on reset

APPLICATIONS

Mobile computing

Flat panel televisions

Media docking stations

Portable electronics

Sound bars

GENERAL DESCRIPTION

audio amplifier. The application circuit requires minimal external

components and operates from a single 7 V to 18 V supply. The

device is capable of delivering 2 × 10 W of continuous output

power into a 4 Ω load (or 2 × 8 W into 8 Ω) with <1% THD + N

from a 12 V supply. In addition, while mono mode is activated,

the user can drive a load as small as 2 Ω up to 20 W continuous

output power by stacking the stereo output terminals.

scheme that requires no external LC output filters. This scheme

continues to provide high efficiency even at low output power.

load or with 82% efficiency at 10 W into 4 Ω from a 12 V supply,

and it has an SNR of >98 dB.

Spread spectrum pulse density modulation (PDM) is used to

provide lower EMI radiated emissions compared with other

modulation select pin (ultralow EMI emission mode) that

significantly reduces the radiated emissions at the Class-D

FCC Class-B emissions testing with an unshielded 20 inch cable

using common-mode choke-based filtering.

rejection of common-mode noise on the input. The device also

includes a highly flexible gain select pin that only requires one

series resistor to choose a gain between 9 dB and 24 dB, with no

change to the input impedance. The benefit of this is to improve

application compared with using external resistors to set gain.

generates a 5 V rail.

shutdown current of 10 µA. Shutdown is enabled by applying a

logic low to the SD pin. The device also includes pop-and-click

suppression circuitry that minimizes voltage glitches at the output

during turn on and turn off, reducing audible noise during

activation and deactivation.

Other included features to simplify system level integration of

band DAC noise interference to the pulse density modulator,

fixed input impedance to simplify component selection across

multiple platform production builds, and a thermal warning

indicator pin.

range (−40°C to +85°C). It has built-in thermal shutdown and

output short-circuit protection. It is available in a halide-free,

40-lead, 6 mm × 6 mm lead frame chip scale package (LFCSP).