PAM8302L
2.5W Filterless Class-D Mono Audio Amplifier
Key Features
n
2.0V to 5.5V Supply Voltage Range
Support
n
Output at 10% THD with a 4Ω Load
2.5W
and 5V Power Supply
n
Filterless, Low Quiescent Current and Low
EMI
n
High Efficiency up to 88%
n
Superior Low Noise
n
Circuit Protection
Short
n
Shutdown
Thermal
n
Few External Components to Save Space
and Cost
n
and DFN3x3 Packages Available
MSOP-8
n
Package
Pb-Free
General Description
The PAM8302L is a 2.5W class-D mono audio
amplifier. Its low total harmonic distortion
(THD+N) offers high-quality sound reproduction.
The PAM8302L uses a filterless design that
avoids the use of low-pass filters. This new design
allows the amplifier to directly drive a speaker,
making it cheap and compact. The new design
allows the amplifier to be more affordable and
take less PCB area.
The PAM8302L uses less power than Class-AB
amplifiers. The use of this product can help
optimize battery life; it is ideal for portable
applications.
The PAM8302L is available in MSOP-8
DFN3x3-8 packages.
and
Applications
n
PMP/MP4
n
GPS
n
Portable Speakers
n
Talkie
Walkie
n
Handsfree Phones/Speaker Phones
n
Phones
Cellular
Typical Application
1µ F
6
VDD
Ci
IN-
Differential
Input
Ci
IN+
ON
Ri
Ri
4
IN-
VO-
8
PAM8302L
3
IN+
VO+
5
1
SD
OFF
GND
7
Power Analog Microelectronics, Inc
www.poweranalog.com
1
11/2010 Rev 1.0
PAM8302L
2.5W Filterless Class-D Mono Audio Amplifier
Block Diagram
VDD
IN+
MODULATOR
DRIVER
VO+
VO-
IN-
THERMAL
PROTECTION
SD
SHUTDOWN
INTERNAL
OSCILLATOR
SHORT
PROTECTION
OSC
GND
Pin Configuration & Marking Information
Top View
MSOP-8
Top View
DFN3x3-8
SD
1
P8302L
XXXXYW
8
7
6
5
VO-
GND
VDD
VO+
SD
NC
IN+
IN-
1
2
3
4
8
7
6
5
VO-
GND
VDD
VO+
X: Internal Code
Y: Year
W: Week
NC
2
IN+
3
IN-
4
P8302L
XXXXYW
Pin Number
1
2
3
4
5
6
7
8
Pin name
SD
Description
Shutdown terminal,active low
No connection
Positive differential input
Negative differential input
Positive BTL output
Analog power supply
Ground
Negative BTL output
NC
IN+
IN-
VO+
VDD
GND
VO-
Power Analog Microelectronics, Inc
www.poweranalog.com
2
11/2010 Rev 1.0
PAM8302L
2.5W Filterless Class-D Mono Audio Amplifier
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 at no Input Signal...................6.0V
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........................ 2.0V to 5.5V
Operation Temperature Range........ -40
°
C to 85
°
C
Junction Temperature Range.........-40
°
C to 125
°
C
Thermal Information
Parameter
Thermal Resistance
(Junction to Case)
Package
MSOP-8
DFN3x3-8
MSOP-8
DFN3x3-8
MSOP-8
DFN3x3-8
Symbol
θ
JC
θ
JC
θ
JA
θ
JA
P
D
P
D
Maximum
75
20
°C/W
Thermal Resistance
(Junction to Ambient)
180
50
550
mW
2000
Unit
Internal Power Dissipation
@ TA=25°C
Power Analog Microelectronics, Inc
www.poweranalog.com
3
11/2010 Rev 1.0
PAM8302L
2.5W Filterless Class-D Mono Audio Amplifier
Electrical Characteristics
V
DD
=5V, Gain = 24dB, R
L
=4Ω,T
A
=25
°
C，unless otherwise noted.
PARAMETER
Supply Voltage Range
Quiescent Current
Shutdown Current
SYMBOL
V
DD
I
Q
I
SHDN
No Load
CONDITIONS
MIN
2.0
TYP
4
MAX
5.5
8
1
UNITS
V
mA
µA
V
SHDN
=0V
f=1kHz, R
L
=4Ω
THD+N=10%
f=1kHz, R
L
=4Ω
THD+N=1%
f=1kHz, R
L
=8Ω
THD+N=10%
F=1kHz, R
L
=8Ω
THD+N=1%
V
DD
=5V
V
DD
=3.6V
V
DD
=5V
V
DD
=3.6V
V
DD
=5V
V
DD
=3.6V
V
DD
=5V
V
DD
=3.6V
f=1kHz
2.25
1.10
1.80
0.86
1.35
0.72
1.15
0.6
2.50
1.25
2.00
0.95
1.50
0.80
1.30
0.65
85
Output Power
P
O
W
Peak Efficiency
Total Harmonic Distortion Plus
Noise
Gain
Power Supply Ripple Rejection
η
88
0.35
0.50
0.40
0.45
25.5
%
R
L
= 8Ω，P
O
=0.1W, f=1kHz
THD+N
0.30
0.45
0.35
0.40
22.5
24
50
45
R
L
= 8Ω，P
O
=0.5W, f=1kHz
R
L
= 4Ω，P
O
=0.1W, f=1kHz
R
L
= 4Ω，P
O
=0.5W, f=1kHz
%
Gv
PSRR
No input, f=1kHz, Vpp=200mV
dB
dB
Dynamic Range
Signal to Noise Ratio
Noise
Oscillator Frequency
Drain-Source On-State
Resistance
SHDN Input High
SHDN Input Low
Over Temperature Protection
Over Temperature Hysteresis
Dyn
SNR
Vn
f
OSC
R
DS(ON)
V
SH
V
SL
OTP
OTH
f=20 to 20kHz
f =20 to 20kHz
No A-weighting
A-weighting
85
75
90
80
180
120
300
200
300
0.50
0.25
0.4
dB
dB
µV
kHz
Ω
V
V
°C
°C
200
I
DS
=100mA
P MOSFET
N MOSFET
1.2
250
0.45
0.20
junction temperature
120
135
30
Power Analog Microelectronics, Inc
www.poweranalog.com
4
11/2010 Rev 1.0
PAM8302L
2.5W Filterless Class-D Mono Audio Amplifier
Typical Performance Characteristics
T
A
=25
O
C, unless otherwise noted.
THD+N VS Output Power
R
L
=8
Ω
, Gain=23dB, f=1kHz
V
DD
= 3 . 6 V
V
DD
= 4 . 2 V
5
%
2
1
0
.5
0
.2
0
.1
20
m
THD+N VS Output Power
R
L
=4
Ω
, Gain=23dB, f=1kHz
50
20
10
5
%
2
1
0.5
50
20
10
V
DD
= 3 . 6 V
V
DD
= 4 . 2 V
V
DD
= 5 V
50
m
100
m
200
m
W
500
m
1
2
3
0.2
0.1
20
m
V
DD
= 5 V
50
m
100
m
200
m
W
500
m
1
2
3
THD+N VS Frequency
R
L
=8
Ω
, Cin=0.1μF, Gain=23dB, V
DD
=5V
10
5
THD+N VS Frequency
R
L
=8
Ω
, Cin=0.1μF, Gain=23dB, V
DD
=3.6V
10
5
2
1
Po=200mW
2
1
%
0.5
Po=500mW
0.5
%
0.2
Po=500mW
0.2
0.1
0.1
0.05
Po=200mW
0.05
0.02
0.02
20
50
100
200
500
Hz
1k
2k
5k
10k
20k
0.01
20
50
100
200
500
Hz
1k
2k
5k
10k
20k
10
5
2
1
0.5
%
0.2
0.1
0.05
0.02
THD+N VS Frequency
R
L
=4
Ω
, Cin=0.1μF, Gain=23dB, V
DD
=5V
10
5
2
THD+N VS Frequency
R
L
=4
Ω
, Cin=0.1μF, Gain=23dB, V
DD
=3.6V
Po=200mW
Po=500mW
%
1
0.5
Po=500mW
0.2
Po=200mW
0.1
0.05
0.01
20
50
100
200
500
Hz
1k
2k
5k
10
k
20
k
0.02
20
50
100
200
500
Hz
1k
2k
5k
10
k
20
k
Power Analog Microelectronics, Inc
www.poweranalog.com
5
11/2010 Rev 1.0
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