PAM8803
3W Filterless Stereo Class-D Audio Amplifier
with Digital Volume Control
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
64-step Digital Volume Control
n
Superior Low Noise
n
Low pop noise
n
Efficiency up to 90%
n
Short Circuit Protection
n
Thermal Shutdown
n
Few External Components to Save Space
and Cost
n
Pb-Free Package
General Description
The PAM8803 is a 3W, class-D audio amplifier
with 64-step digital volume control. It offers low
THD+N, allowing it to produce high-quality sound
reproduction. The new filterless architecture
allows the device to drive the speaker directly,
without needing low-pass output filters
,
which will
save 30% system cost and 75% PCB area.
With the same numbers of external components,
the efficiency of the PAM8803 is much better than
class-AB cousins. It can extend the battery life,
ideal for portable applications.
The PAM8803 is available in a SSOP-24 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
100
90
VDD
C1
1μF
C2 1μF
PVDD
C3 10μF
Efficiency vs Output Power
80
Efficiency(%)
70
60
50
40
30
20
10
0
0
0.5
1
R
L
=4Ω
R
L
=8Ω
7
4
18
5
2
3
VDD GND PVDD
+OUT_L
PGND PGND
21
+OUT_R
24
17
14
S1
C7
INR
0.47μF
SP_L
C6
INL
0.47μF
1
8
10
C8 1μF
-OUT_L
INL
VREF
-OUT_R
INR
SP_R
1.5
Output Pow er(W)
2
2.5
3
PAM8803
UP
Radiated Emissions
ON
MUTE
ON
SHDN
MUTE
6 MUTE
19 SHDN
NCNCNCNCPVDD
9 11 12 16 20
DN
RST
PGND
23
13
S2
SHDN
15
S3
FCC Class B Limit
PGND
22
C4 1μF
PVDD
C5 10μF
Power Analog Microelectronics
,
Inc
www.poweranalog.com
1
12/2009 Rev 1.4
PAM [ POWER ANALOG MICOELECTRONICS ]
