1. General description
The TFA9895 is a high efficiency class-D audio amplifier with a sophisticated
SpeakerBoost protection algorithm. It can deliver 2.65 W (RMS; THD = 1 %) output power
into a 4 speaker at a battery voltage of 3.6 V. The internal boost converter raises the
supply voltage to 5.3 V, providing ample headroom for major improvements in sound
quality.
A safe working environment is provided for the speaker under all operating conditions.
The TFA9895 maximizes acoustic output while ensuring diaphragm displacement and
voice coil temperature do not exceed their rated limits. This function is based on a
speaker box model that operates in all loudspeaker environments (e.g. free air, closed box
or vented box). Furthermore, advanced signal processing ensures the quality of the audio
signal is never degraded by unwanted clipping or distortion in the amplifier or speaker.
Unlike competing solutions, the adaptive sound maximizer algorithm uses feedback to
accurately calculate both the temperature and the excursion, allowing the TFA9895 to
adapt to changes in the acoustic environment.
Internal intelligent DC-to-DC conversion boosts the supply rail to provide additional
headroom and power output. The supply voltage is only raised when necessary. This
maximizes the output power of the class-D audio amplifier while limiting quiescent power
consumption.
The TFA9895 also incorporates advanced battery protection. By limiting the supply
current when the battery voltage is low, it prevents the audio system from drawing
excessive load currents from the battery, which could cause a system undervoltage. The
advanced processor minimizes the impact of a falling battery voltage on the audio quality
by preventing distortion as the battery discharges.
The device features low RF susceptibility because it has a digital input interface that is
insensitive to clock jitter. The second order closed loop architecture used in a class-D
audio amplifier provides excellent audio performance and high supply voltage ripple
rejection. The audio input interface is I
2
S and the control settings are communicated via
an I
2
C-bus interface.
The TFA9895 is available in a 29-bump WLCSP (Wafer Level Chip-Size Package) with a
400 m pitch.
TFA9895
Boosted class-D audio amplifier with SpeakerBoost
protection algorithm and multiband dynamic range
compressor
Rev. 1 — 24 May 2013 Product data sheet
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