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IS31AP2145A 2.9W@5V MONO CLIP-LESS & FILTER-LESS CLASS-D
AUDIO POWER AMPLIFIER
Integrated Silicon Solution, Inc. – www.issi.com 1
Rev. A, 01/13/2015
DESCRIPTION
The IS31AP2145A is a 2.9W@5.0V mono, clip-less,
filter-less, high efficiency Class-D audio power
amplifier with automatic gain control.
The IS31AP2145A integrates an AGC (Automatic Gain
Control) function to automatically prevent distortion of
the audio signal by which we can enhance audio
quality and also protect the speaker from damage at
high power levels. The AGC function and its attack
time/release time are selectable via the CTRL pin. The
IS31AP2145A also provides thermal and over current
protection functions.
The demo board has four modes (AGC1, AGC2, AGC
OFF, and SHUTDOWN) to test the functionality of the
IS31AP2145A.
FEATURES
Operating from V
CC
= 2.7V ~ 5.5V
Filter-less Class-D architecture
AGC enable/disable function
2.7W into 4 at 5.0V (10% THD+N)
Minimum external components
High efficiency: 90%
Click-and-pop suppression
Short-circuit and thermal protection
Space-saving UTQFN-9, 1.5mm × 1.5mm
QUICK START
Figure 1: Photo of IS31AP2145A Evaluation Board
RECOMMENDED EQUIPMENT
5.0V, 2A power supply
Audio source (i.e. MP3 player, Notebook PC, etc.)
8 or 4 speakers
ABSOLUTE MAXIMUM RATINGS
5.5V power supply
Caution: Do not exceed the conditions listed above, otherwise
the board will be damaged.
PROCEDURE
The IS31AP2145A demo board is fully assembled and
tested. Follow the steps below to verify board
operation.
Caution: Do not turn on the power supply until all connections
are completed.
1) Connect a 4 (or larger) speaker across the OUT-
terminal and OUT+ terminal or the RCA female
connector (SPK CON3).
2) Connect the ground terminal of the power supply
to the GND (TP2) and the positive terminal to the
VCC (TP1). Or connect DC power to connector
(DC IN) with a 2.5 mm jack.
3) If the audio source is differential, remove jumper
JP1, connect the negative of the audio source to
the IN- terminal, and connect the positive of the
audio source to IN+ terminal.
4) If the audio source is single-ended, connect the
audio source to the IN+ terminal, and close
jumper JP1; or connect audio source to the audio
mono connector (AUDIO IN) and close jumper
JP1.
Turn on the power supply, and pay attention to the
supply current. If it is over 1.5A, turn off power and
check the evaluation board for short circuit
connections.
ORDERING INFORMATION
Part No. Temperature Range Package
IS31AP2145A-UTLS2-EB -40°C ~ +85°C (Industrial) UTQFN-9, Lead-free
Table 1: Ordering Information
For pricing, delivery, and ordering information, please contact ISSI’s analog marketing team at
analog@issi.com or (408) 969-6600.
