PAM8603M
3W Filterless Stereo Class-D Audio Amplifier with DC Volume Control
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 DC Volume Control from -75dB to
+24dB
n
Superior Low Noise
n
Efficiency up to 89%
n
Short Circuit Protection
n
Thermal Shutdown
n
Few External Components to Save the
Space and Cost
n
Pb-Free Package
General Description
The PAM8603M is a 3W, sterero, class-D audio
amplifier with DC 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,
requiring no low-pass output filters
,
which saves
the system cost and PCB area.
With the same numbers of external components,
the efficiency of the PAM8603M is much better
than class-AB cousins. It can extend the battery
life thus ideal for portable applications.
The PAM8603M is available in SSOP-24 and
SOP-18 packages.
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 Circuit
Efficiency vs Output Power
PVDDL
10μF
1μF
Efficiency(%)
100
90
80
70
60
50
40
30
20
10
R
L
=4
Ω
R
L
=8
Ω
PVDDL
+OUTL
PGNDL
+OUTR
-OUTL
0.47μF
INL
1μF
VREF
ON
-OUTR
0.47
μF
INR
VDD
VDD
1μF
INR
0
0
0.5
1
1.5
Output Pow er(W)
2
2.5
3
INL
PAM8603M
Radiated Emissions
SHDN
SHDN
ON
VDC
VOLUME
GND
50kO
MUTE
MUTE
FCC Class B Limit
PVDDR PGNDR
1μF
10μF
PVDDR
Power Analog Microelectronics
,
Inc
www.poweranalog.com
1
10/2008 Rev 1.0
PAM8603M
3W Filterless Stereo Class-D Audio Amplifier with DC Volume Control
Block Diagram
VDD
VDD/2
PVDDR PGNDR
-
INR
+
+
-
MODULATOR
DRIVER
+OUTR
-OUTR
THERMAL
PROTECTION
Attenuation Decoder
VDC
VOLUME
MUTE
SHDN
Interface Control
INTERNAL
OSCILLATOR
BIAS AND
REFERENCES
VREF
OSC
CURRENT
PROTECTION
MODULATOR
+OUTL
DRIVER
INL
VDD/2
+
-
-
+
-OUTL
GND
PVDDL
PGNDL
Pin Configuration & Marking Information
Top View
SSOP-24
+OUTL
PGNDL
PGNDL
-OUTL
PVDDL
1
2
3
4
5
24
+OUTR
23
PGNDR
22
PGNDR
21
-OUTR
20
PVDDR
19
SHDN
18
GND
17
INR
16
NC
15
NC
14
VREF
13
NC
Top View
SOP-18
+OUTL
PGNDL
-OUTL
PVDDL
MUTE
VDD
INL
VDC
VOLUME
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
MUTE
6
VDD
7
INL
8
NC
9
VDC
10
VOLUME
11
NC
12
+OUTR
PGNDR
-OUTR
PVDDR
SHDN
GND
INR
NC
VREF
PAM8603M
XXXYWWXX
Power Analog Microelectronics
,
Inc
www.poweranalog.com
2
10/2008 Rev 1.0
PAM8603M
XXXYWWXX
X: Internal Code
Y: Year
WW: Week
PAM8603M
3W Filterless Stereo Class-D Audio Amplifier with DC Volume Control
Pin Descriptions
Pin Name
+OUTL
PGNDL
-OUTL
PVDDL
MUTE
VDD
INL
NC
VDC
VOLUME
VREF
INR
GND
SHDN
PVDDR
-OUTR
PGNDR
+OUTR
SSOP-24
1
2,3
4
5
6
7
8
9, 12,13,15,16
10
11
14
17
18
19
20
21
22,23
24
SOP-18
1
2
3
4
5
6
7
11
8
9
10
12
13
14
15
16
17
18
Description
Left Channel Positive Output
Left Channel Power GND
Left Channel Negative Output
Left Channel Power Supply
Mute Control Input（active low）
Analog Power Supply
Left Channel Input
No Connect
Analog reference for gain control section
DC volume control to set the gain of Class-D
Internal analog reference, connect a bypass capacitor from
VREF to GND
Right Channel Input
Analog Ground
Shutdown Control Input(active low)
Right Channel Power Supply
Right Channel Negative Output
Right Channel Power GND
Right Channel Positive Output
Absolute Maximum Ratings
These are stress ratings only and functional operation is not implied
.
Exposure to absolute
maximum ratings for prolonged time periods may affect device reliability
.
All voltages are with
respect to ground
.
Supply Voltage ............................................6.6V
Input Voltage.............................-0.3V to V
DD
+0.3V
Maximum Junction Temperature..................150 °C
Storage Temperature.....................-65°C to 150 °C
Soldering Temperature...................... 300°C, 5sec
Recommended Operating Conditions
Supply Voltage Range....................... 2.8V to 5.5V
Max. Supply Voltage (for Max. duration of
30 minutes)................................................6.4V
Junction Temperature Range.........-40 °C to 125 °C
Ambient Temperature Range............-40 °C to 85 °C
Thermal Information
Parameter
Thermal Resistance (Junction to Ambient)
Thermal Resistance (Junction to Case)
Symbol
θ
JA
θ
Jc
Package
SSOP-24
SOP-18
SSOP-24
SOP-18
Maximum
96
70
18
16
Unit
°C/W
°C/W
°C/W
°C/W
Power Analog Microelectronics
,
Inc
www.poweranalog.com
3
10/2008 Rev 1.0
PAM8603M
3W Filterless Stereo Class-D Audio Amplifier with DC Volume Control
Electrical Characteristic
V
DD
=5V, Gain=20dB,T
A
=25 °C, unless otherwise noted.
Symbol
V
DD
Parameter
Supply Voltage
THD+N=10%, f=1kHz,R
L
=4Ω
THD+N=1%, f=1kHz, R
L
=4Ω
Po
Output Power
THD+N=10%, f=1kHz,R
L
=8Ω
THD+N=1%,f=1kHz,R
L
=8Ω
V
DD
=5.0V,Po=0.5W,R
L
=8Ω
THD+N
Total Harmonic
Distortion Plus Noise
V
DD
=3.6V,Po=0.5W,R
L
=8Ω
V
DD
=5.0V,Po=1W,R
L
=4Ω
V
DD
=3.6V,Po=1W,R
L
=4Ω
PSRR
Cs
SNR
Vn
Dyn
η
Power Supply Ripple
Rejection
Crosstalk
Signal-to-noise ratio
Output noise
Dynamic range
Efficiency
V
DD
=5.0V, Inputs ac-grounded
f=100Hz
f=1kHz
f=1kHz
V
DD
=5.0V
V
DD
=3.6V
V
DD
=5.0V
V
DD
=3.6V
V
DD
=5.0V
V
DD
=3.6V
V
DD
=5.0V
V
DD
=3.6V
f=1kHz
Test Conditions
MIN
2.8
2.85
1.55
2.35
1.25
1.55
0.75
1.15
0.5
3.2
1.8
2.6
1.5
1.8
0.9
1.4
0.72
0.15
0.11
0.15
0.11
-59
-58
-95
85
A-weighting
No A-weighting
90
f=1kHz
85
80
No load
98
75
120
102
89
85
13.5
8.5
2.7
20
15
5
1
PMOS
NMOS
200
240
180
260
10
1.45
0.65
135
30
°C
500
350
300
50
kHz
mV
V
mA
μA
mΩ
mA
150
300
dB
%
0.3
0.25
0.3
0.25
-50
-50
-80
dB
dB
μV
dB
%
%
W
W
W
TYP
MAX UNIT
5.5
V
W
V
DD
=5V,Po=0.5W, R
L
=8Ω,f=1kHz
V
DD
=5V, Vo_rms=1V, f=1kHz
V
DD
=5V, Inputs ac-grounded
with Cin=0.47μF
V
DD
=5.0V, THD=1%, f=1kHz
R
L
=8Ω, THD=10%
R
L
=4Ω, THD=10%
V
DD
=5V
V
DD
=3.6V
V
DD
=5.0V, V
MUTE
=0.3V
V
DD
=2.5V to 5.5V, V
S D
=0.3V
I
DS
=500mA,Vgs=5V
V
DD
=3V to 5V
Vin=0V, V
DD
=5V
V
DD
=5V
V
DD
=5V
No Load, Junction Temperature, V
DD
=5V
I
Q
I
MUTE
I
S D
Rdson
fsw
Vos
V
IH
V
IL
OTP
OTH
Quiescent Current
Muting Current
Shutdown Current
Static Drain-to-source
On-state Resistor
Switching Frequency
Output Offset Voltage
SD/MUTE Input High
SD/MUTE Input Low
Over Temperature
Protection
Over Temperature Hysterisis
Power Analog Microelectronics
,
Inc
www.poweranalog.com
4
10/2008 Rev 1.0
PAM8603M
3W Filterless Stereo Class-D Audio Amplifier with DC Volume Control
Typical Operating Characteristics
(T =25°C)
A
1. Efficiency VS Output Power
100
90
80
Efficiency (%)
Efficiency (%)
100
90
80
2. Efficiency VS Output Power
70
60
50
40
30
20
10
0
0
V
DD
=5V
V
DD
=3.6V
70
60
50
40
30
20
V
DD
=5V
V
DD
=3.6V
R
L
=8 Ω
0.5
1
Output Pow er (W)
1.5
2
10
0
0
0.5
1
1.5
2
Output Pow er (W)
R
L
=4 Ω
2.5
3
3.THD+N VS Output Power
30
10
5
2
1
% 0.5
0.2
0.1
0.05
0.02
0.01
10m
20m
50m
100 m
200 m
W
500 m
1
2
4
.
4.THD+N VS Output Power
30
20
10
5
R
L
=8 Ω
Gain=20dB
f=1kHz
V
DD
=5V
R
L
=4 Ω
Gain=20dB
f=1kHz
V
DD
=5V
2
1
V
DD
=3.6V
V
DD
=3.6V
%
0.5
0.2
0.1
0 05
0.02
0.01
10 m
20 m
50 m
100m
W
200m
500m
1
2
4
5. THD+N VS Frequency
10
10
6. THD+N VS Frequency
5
5
Po=0.5W
R
L
=8 Ω
Cin=0.47 μ F
Gain=20dB
2
2
Po=1W
R
L
=4 Ω
Cin=0.47 μ F
Gain=20dB
%
1
%
1
0.5
V
DD
=5V
0.5
V
DD
=3.6V
0.2
0.2
V
DD
=3.6V
0.1
20
50
100
200
500
Hz
1k
2k
5k
10k
20k
V
DD
=5V
0.1
0.08
20
50
100
200
500
Hz
1k
2k
5k
10k
20k
Power Analog Microelectronics
,
Inc
www.poweranalog.com
5
10/2008 Rev 1.0
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