A Product Line of
Diodes Incorporated
PAM8603A
ANTI-SATURATION FILTERLESS 3W CLASS-D STEREO AMPLIFIER
WITH DC VOLUME CONTROL AND HEADPHONE OUTPUT
Description
The PAM8603A is a 3W, Class-D audio amplifier with headphone
amplifier. Advanced 64-Step DC volume control minimizes external
components and allows speaker volume control and headphone
volume control. PAM unique antisaturation technology which detects
output signal clip due to the over level input signal suppress the
output signal clip automatically. Also the antisaturation function can
adapt the output clip caused by power supply voltage down with
battery. It offers low THD+N, to produce highquality sound
reproduction. The new filterless architecture allows the device to
drive the speaker directly, without low-pass output filters which will
save system cost and PCB area.
With the same numbers of external components, the efficiency of the
PAM8603A is much better than Class-AB cousins. It can extend the
battery life thus be ideal for portable applications.
The PAM8603A is available in a SSOP-24 package.
Pin Assignments
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
3W Output at 10% THD with a 4Ω Load and 5V Power Supply
Filterless, Low Quiescent Current and Low EMI
Low THD+N
64-Step DC Volume Control
Headphone Output Function
Unique Anti-Saturation Function
Superior Low Noise
Low Pop Noise
Efficiency Up to 90%
Short Circuit Protection
Thermal Shutdown
Few External Components to Save the Space and Cost
Pb-Free Package
Applications
•
•
•
•
•
LCD Monitors / TV Projectors
Notebook Computers
Portable Speakers
Portable DVD Players, Game Machines
VoIP/Speakers Phones
PAM8603A
Document number: DSxxxxx Rev. 1 - 2
1 of 16
www.diodes.com
November 2012
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM8603A
Typical Applications Circuit
Pin Descriptions
Pin
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Pin
Name
+OUT_L
PGNDL
PGNDL
-OUT_L
PVDDL
MUTE
VDD
IN L
EAR IN L
VDC
VOLUME
EAR OUT L
EAR OUT R
VREF
LINE/EAR
EAR IN R
INR
GND
SHDN
PVDDR
-OUT_R
PGNDR
PGNDR
+OUT_R
Function
Left Channel Positive Output
Left Channel Power GND
Left Channel Positive GND
Left Channel Negative Output
Left Channel Power Supply
Mute Control Input (active low)
Analog VDD
Left Channel Input
Left Earphone Input
Analog Reference for gain Control Section
DC Voltage Control to Set the Gain of Class-D
Left Earphone Output
Right Earphone Output
Internal Analog Reference, Connect a Bypass Capacitor from VREF to GND
Line/ Ear Detect
Right Earphone Input
Right Channel Input
Analog GND
Shutdown Control Input (active low)
Right Channel Power Supply
Right Channel Negaitive Output
Right Channel Power GND
Right Channel Power GND
Right Channel Positive Output
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November 2012
© Diodes Incorporated
PAM8603A
Document number: DSxxxxx Rev. 1 - 2
A Product Line of
Diodes Incorporated
PAM8603A
Functional Block Diagram
Absolute Maximum Ratings
(@T
A
= +25°C, unless otherwise specified.)
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.
Parameter
Supply Voltage
Input Voltage
Maximum Junction Temperature
Storage Temperature
Soldering Temperature
Rating
6.0
-0.3 to V
DD
+0.3
150
-65 to +150
300, 5 sec
Unit
V
°C
Recommended Operating Conditions
(@T
A
= +25°C, unless otherwise specified.)
Parameter
Supply Voltage Range
Ambient Temperature Range
Junction Temperature Range
Rating
2.5 to 5.5
-20 to +85
-20 to +125
Unit
V
°C
°C
Thermal Information
Parameter
Thermal Resistance (Junction to Ambient)
Package
SSOP-24
Symbol
θ
JA
Max
96
Unit
°C/W
PAM8603A
Document number: DSxxxxx Rev. 1 - 2
3 of 16
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November 2012
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM8603A
Electrical Characteristics
(@T
A
= +25°C, V
DD
= 5V, Gain = Maximum, R
L
= 8Ω, unless otherwise specified.)
Parameter
Class D Stage
Supply Voltage Range
Quiescent Current
Output Offset Voltage
Drain-Source On-State Resistance
Symbol
V
DD
I
Q
V
OS
R
DS(ON)
No Load
No Load
I
DS
= 0.5A
THD+N = 10%, f = 1kHz,
Anti-saturation off
Output Power
P
O
THD+N = 1%, f = 1kHz,
Anti-saturation off
f = 1kHz,
Anti-saturation on
Total Harmonic Distortion Plus Noise
Power Supply Ripple Rejection
Channel Separation
Oscillator Frequency
Efficiency
Noise
Signal Noise Ratio
Earphone Stage
Quiescent Current
Output Offset Voltage
Output Power
Total Harmonic Distortion Plus Noise
Power Supply Ripple Rejection
Channel Separation
Noise
Signal Noise Ratio
Control Section
Under Voltage Lock-Out
Mute Current
Shutdown Current
Ear/ Line Threshold Voltage
SHDN Input High
SHDN Input High
MUTE Input High
MUTE Input High
Over Temperature Protection
Over Temperature Hysteresis
THD+N
PSRR
CS
f
OSC
η
V
N
SNR
IQ
V
OS
P
O
THD+N
PSRR
CS
V
N
SNR
UVLO
I
MUTE
I
SHDN
V
TH
V
SH
V
SL
V
MH
V
ML
OTP
OTH
1.2
0.5
140
30
°C
°C
1.2
0.5
V
MUTE
= 0V
V
SHDN
= 0V
0.65
P
O
= 1.7W, f =1 kHz, R
L
= 8Ω
P
O
= 3.0W, f =1 kHz, R
L
= 4Ω
A-Weighting
Input AC-GND
No A-Weighting
f = 20 – 20kHz, THD = 1%
No Load
No Load
THD+N = 1%, R
L
= 32Ω, f = 1KHz
R
L
= 32Ω, P
O
= 10mW, f = 1kHz
Input AC-GND,
f = 1kHz, V
PP
= 200mV
P
O
= 1W,
f = 1kHz
Input
AC-GND
A-Weighting
No A-Weighting
P MOSFET
N MOSFET
R
L
= 8Ω
R
L
= 4Ω
R
L
= 8Ω
R
L
= 4Ω
R
L
= 8Ω
R
L
= 4Ω
1.55
2.85
1.10
2.3
Test Conditions
Min
2.5
10
10
0.35
0.25
1.70
3.00
1.35
2.5
1.0
2.0
0.08
0.08
-70
-95
200
85
80
250
89
83
220
350
85
4.5
2.5
60
0.02
-75
-85
40
70
85
2
1
3
1
mA
µA
7.5
300
%
dB
dB
kHz
%
%
µV
dB
mA
V
mW
%
dB
dB
µV
dB
W
Typ
Max
5.5
15
50
Units
V
mA
mV
Ω
R
L
= 8Ω, P
O
= 0.85W, f = 1KHz
R
L
= 4Ω, P
O
= 1.75W, f = 1KHz
Input AC-GND, f = 1KHz,
V
PP
= 200mV, Gain =2V/V
P
O
= 1W, f = 1KHz
f = 20 – 20kHz, V
O
= 1V
RMS
PAM8603A
Document number: DSxxxxx Rev. 1 - 2
4 of 16
www.diodes.com
November 2012
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM8603A
Typical Performance Characteristics
(@T
A
= +25°C, V
DD
= 5V, R
L
= 8Ω, G
V
= 24dB, unless otherwise specified.)
Class-D Output
PAM8603A
Document number: DSxxxxx Rev. 1 - 2
5 of 16
www.diodes.com
November 2012
© Diodes Incorporated
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