PAM8403
Filterless 3W Class-D Stereo Audio Amplifier
Key Features
n
3W Output at 10% THD with a 4 Ω Load and
5V Power Supply
n
Filterless, Low Quiescent Current and Low
EMI
n
Low THD+N
n
Superior Low Noise
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Efficiency up to 90%
n
Short Circuit Protection
n
Thermal Shutdown
n
Few External Components to Save the
Space and Cost
n
Pb-Free Package
General Description
The PAM8403 is a 3W, class-D audio amplifier. It
offers low THD+N, allowing it to achieve high-
quality sound reproduction. The new filterless
architecture allows the device to drive the speaker
directly, requiring no low-pass output filters,thus
to save the system cost and PCB area.
With the same numbers of external components,
the efficiency of the PAM8403 is much better than
that of class-AB cousins. It can extend the battery
life, ideal for portable applications.
The PAM8403 is available in SOP-16 package.
Applications
n
n
n
n
n
LCD Monitors / TV Projectors
Notebook Computers
Portable Speakers
Portable DVD Players, Game Machines
Cellular Phones/Speaker Phones
Typical Application
Efficiency vs Output Power
100
90
VDD
PVDD
80
Efficiency(%)
70
60
50
40
30
20
10
0
0
0.5
1
R
L
=4
Ω
R
L
=8
Ω
1μF
1μF
470μF
1μF
13
6
4
VDD
0.47μF
INL
Ri
7
PVDD PVDD
+OUT_L
-OUT_L
1
INL
1.5
Output Pow er(W)
2
2.5
3
8
0.1μF
0.47μF
10
INR
Ri
12
SHDN
5
MUTE
VREF
3
PAM8403
INR
SHDN
MUTE
GND NC PGNDPGND
11
9
2
15
-OUT_R
14
Radiated Emissions
+OUT_R
16
FCC Class B Limit
Power Analog Microelectronics
,
Inc
www.poweranalog.com
09/2008 Rev 1.3
1
PAM [ POWER ANALOG MICOELECTRONICS ]
