IS31AP2145E
Integrated Silicon Solution, Inc. – www.issi.com 1
Rev. A, 01/08/2014
2.7W@5.0V MONO CLIP-LESS & FILTER-LESS
CLASS-D AUDIO POWER AMPLIFIER
January 2014
DESCRIPTION
The IS31AP2145E is a 2.7W@5.0V mono, clip-less,
filter-less, high efficiency Class-D audio power
amplifier with automatic gain control.
The IS31AP2145E integrates 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
IS31AP2145E also provides thermal and over current
protection functions.
In addition to these features, 90% high efficiency,
improved RF-rectification immunity, a fast start-up time
and small package size make IS31AP2145E ideal
choice for cellular handsets, PDAs and other portable
applications.
IS31AP2145E is available in a 1.5mm×1.5mm
UTQFN-9 package.
FEATURES
Filter-less Class-D architecture
AGC enable/disable function
2.7W into 4 at 5.0V (10% THD+N)
Power supply range: 2.7V to 5.5V
Selectable attack and release times
Minimum external components
High efficiency: 90%
Click-and-pop suppression
Short-circuit and thermal protection
Space-saving UTQFN-9, 1.5mm × 1.5mm
APPLICATIONS
Wireless or cellular handsets and PDAs
Portable navigation devices
Portable DVD player
Notebook PC
Educational toys
USB speakers
TYPICAL APPLICATION CIRCUIT
OUT+
GND
IS31AP2145E
A2
A1
C3
A3
B2
VCC
OUT-
1 F
IN+
IN-
VREF
CIN
33nF
C
IN
33nF
CTRL
C1
C2
Differential In
V
Battery
0.1 F
1 F
B1,B3
0.1 F
CTRL1
CTRL2
R1
R2
R3
Figure 1 Typical Application Circuit (Differential Input)
