30 W, Filterless, Class D, Output Sensing
Audio Amplifier
Data Sheet
SSM3525
FEATURES
GENERAL DESCRIPTION
Filterless digital input, mono Class D amplifier with Σ-Δ
modulation
Digitized output of output voltage, output current, and PVDD
supply voltage
Operates from 4.5 V to 17 V supply, such as a 2-cell or 3-cell
battery
Input/output supply operation from 1.1 V to 1.98 V
30.2 W output power, 17 V supply and 4 Ω load at 1% THD + N
37.5 μV rms noise, 107 dB A weighted signal-to-noise ratio
I2C control with up to 4 pin-selectable addresses
Multiple serial data formats
TDM, I2S, or left justified slave
PDM input/output operating from 2.048 MHz to
6.144 MHz
Support sample rates from 8 kHz to 192 kHz
Flexible digital and analog gain adjustment
AGC with battery voltage-based limiter
74 dB SNR on output current sensing and 85 dB SNR on
voltage sensing
6.62 mA quiescent current at 12 V PVDD supply
Temperature sensor with 1°C readout
Short-circuit, thermal protection, and thermal warning
23-ball, 2.26 mm × 2.38 mm, 0.4 mm pitch WLCSP
Pop and click suppression
The SSM3525 is a fully integrated, high efficiency, mono Class D
audio amplifier with digital input and digitized output of output
voltage, output current, and PVDD supply. The application
circuit requires few external components and can operate from
4.5 V to 17 V (PVDD) and 1.8 V (IOVDD) supplies. It is capable of
delivering 8.3 W of continuous output power into an 8 Ω load (or
15.3 W into 4 Ω) with <1% total harmonic distortion + noise (THD
+ N) from a 12 V supply, or 30.2 W into an 4 Ω load from a 17 V
power supply, all with <1% THD + N.
The SSM3525 features a high efficiency, low noise modulation
scheme that requires no external inductor/capacitor (LC) output
filters. This scheme continues to provide high efficiency even at
low output power. It operates with 92% efficiency at 9 W into an
8 Ω load, 12V or 89% efficiency at 20 W into 4 Ω from a 17 V
supply, and it has an signal-to-noise ratio (SNR) of 107 dB,
A weighted.
Spread spectrum pulse density modulation provides lower
electromagnetic interference (EMI) radiated emissions compared
with other Class D architectures, particularly above 100 MHz.
The digital input eliminates the need of an external digital-to-
analog converter (DAC). The SSM3525 has a micropower
shutdown mode with a typical shutdown current of 90 nA at
12 V PVDD supply. Individual sense blocks can be powered
down to save power when sense is not needed.
User-selectable ultralow EMI emissions mode
Power-on reset
The device also includes pop and click suppression circuitry
that minimizes voltage glitches at the output during turn on and
turn off.
APPLICATIONS
Mobile computing
Portable electronics
Current sensing is accomplished using an integrated analog-to-
digital converter (ADC) and internal sense resistor. The
digitized voltage and current information can be returned in
various serial audio formats, including I2S, time division
multiplexing (TDM) and pulse density modulation (PDM).
The SSM3525 includes an integrated regulator to generate the
required 5 V analog supply. Alternatively, if an external 5 V rail
from a dc-to-dc converter is available, it can improve system
efficiency.
The SSM3525 is designed to operate with an I2C control interface
and specified over the temperature range of −40°C to +85°C. It has
built-in thermal shutdown and output short-circuit protection. It is
available in a halide free, 23-ball, 2.26 mm × 2.38 mm wafer-level
chip scale package (WLCSP).
Rev. A
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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Tel: 781.329.4700
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