Digital 2.5 W, 5.1 V, Boost Class-D Audio
Amplifier with Output Sensing
SSM4567
Data Sheet
Output noise: 21.7 μV rms, A-weighted
FEATURES
THD + N: 0.025% at 1 kHz, 500 mW output power
Filterless Class-D amplifier with spread-spectrum Σ-Δ
modulation with integrated boost regulator (5.1 V)
Digitized output of output voltage, output current, and VBAT
supply voltage
PSSR: 90 dB at 217 Hz, with dither input
72 dB signal-to-noise ratio (SNR) on output current sensing
and 77 dB SNR on voltage sensing
Quiescent power consumption: 19.8 mW
Pop-and-click suppression
Integrated boost regulator
Multiple serial data formats
PDM input/output
Flexible battery monitoring AGC
Short-circuit protection for boost and Class-D outputs and
thermal protection with automatic recovery
Smart power-down when PDM stop condition
or no clock input detected
DC blocking high-pass filter and static input DC protection
for PDM input
TDM slave with support for up to 8 chips on a single bus
I2S or left justified slave
Multichip I2S with support for up to 4 chips on one I2S bus
8 kHz to 192 kHz PCM sample rates
2.048 to 6.14 MHz PDM input sample rates
Configurable via I2C control, TDM control, or PDM patterns
Standalone control modes
Selectable ultralow EMI emissions and low latency modes
2.5 W into 4 Ω load and 1.42 W into 8 Ω load at 3.6 V supply
with <1% total harmonic distortion plus noise (THD + N)
Available in 19-ball, 1.74 mm × 2.1 mm, 0.4 mm pitch WLCSP
89.7% system efficiency into 8 Ω at 1 W, VBAT = 3.6 V
APPLICATIONS
Mobile handsets
Tablets
Portable media players
FUNCTIONAL BLOCK DIAGRAM
LR_SEL/
ADDR
SEL
BSTSW
BSTSW VBST VBST
SCL
SDA
SSM4567
BOOST (5V)
DAC_PDM_DAT/
DAC_SDATAI
Σ-∆
CLASS-D
MOD
FILTERING
MODULATION
H-BRIDGE
(5V)
OUTN
OUTP
DAC
DAC_PDM_CLK/
BCLK
R
2
I S/TDM/
PDM
INTERFACE
SNS_PDM_DAT/
SNS_SDATAO
PGND
V
ADC
SENSE
SNS_PDM_CLK/
FSYNC
I
ADC
SENSE
IOVDD
AGND
VBAT
Figure 1.
Rev. 0
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