PAM8302A
2.5W Filterless Class-D Mono Audio Amplifier
Key Features
n
2.5W Output at 10% THD with a 4 Ω Load
and 5V Power Supply
n
Filterless, Low Quiescent Current and Low
EMI
n
High Efficiency up to 88%
n
Superior Low Noise
n
Short Circuit Protection
n
Thermal Shutdown
n
Few External Components to Save Space
and Cost
n
MSOP-8, SOP-8 and DFN3x3 Packages
Available
n
Pb-Free Package
General Description
The PAM8302A is a 2.5W class-D mono audio
amplifier. Its low THD+N feature offers high-
quality sound reproduction. The new filterless
architecture allows the device to drive speaker
directly instead of using low-pass output filters,
therefore save system cost and PCB area.
With the same number of external components,
the efficiency of the PAM8302A is much better
than that of class-AB cousins. It can optimize
battery life thus is ideal for portable applications.
The PAM8302A is available in MSOP-8, SOP-8
and DFN3x3 packages.
Applications
n
n
n
n
n
n
PMP/MP4
GPS
Portable Speakers
Walkie Talkie
Handsfree phones/Speaker Phones
Cellular Phones
Typical Application
1μF
6
VDD
Ci
IN-
Differential
Input
Ci
IN+
ON
OFF
Ri
Ri
4
IN-
VO-
8
3
1
PAM8302A
IN+
VO+
/SD
GND
5
7
Power Analog Microelectronics
,
Inc
www.poweranalog.com
1
09/2008 Rev 1.2
PAM8302A
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/SOP-8
Top View
DFN3x3
SD
1
P8302A
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
P8302A
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
09/2008 Rev 1.2
PAM8302A
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...................6.6V
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........................ 2.5V to 5.5V
Max. Supply Voltage (for Max. duration of
30 minutes)................................................6.0V
Ambient Operation Temperature
Range......................................... -40
°
C to 85
°
C
Junction Temperature Range.........-40
°
C to 125
°
C
Thermal Information
Parameter
Thermal Resistance
(Junction to ambient)
Symbol
Package
SOP-8
Maximum
115
180
47.9
Unit
°C/W
°C/W
°C/W
θ
JA
MSOP-8
DFN 3x3-8
Power Analog Microelectronics
,
Inc
www.poweranalog.com
3
09/2008 Rev 1.2
PAM8302A
2.5W Filterless Class-D Mono Audio Amplifier
Electrical Characteristic
V
DD
=5V, Gain = 24dB, R
L
=4 Ω, T
A
=25
°
C
，
unless otherwise noted.
PARAMETER
Supply Voltage Range
Quiescent Current
Shutdown Current
SYMBOL
V
DD
I
Q
I
SHDN
No Load
V
SHDN
=0V
f=1kHz, R
L
=4Ω
THD+N=10%
f=1kHz, R
L
=4Ω
Output Power
P
O
THD+N=1%
f=1kHz, R
L
=8Ω
THD+N=10%
F=1kHz, R
L
=8Ω
THD+N=1%
Peak Efficiency
Total Harmonic Distortion Plus
Noise
Gain
Power Supply Ripple Rejection
η
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
2.50
1.25
2.00
0.95
1.50
0.80
1.30
0.65
85
88
%
W
CONDITIONS
MIN
2.5
4
TYP
MAX
5.5
8
1
UNITS
V
mA
μA
R
L
= 8Ω，P
O
=0.1W, f=1kHz
THD+N
0.30
0.45
0.35
0.40
24
dB
dB
45
50
%
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
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
S H
V
SL
OTP
OTH
f=20 to 20kHz
f =20 to 20kHz
No A-weighting
A-weighting
200
I
DS
=100mA
P MOSFET
N MOSFET
1.2
90
80
180
120
250
0.45
0.20
0.4
135
30
300
dB
dB
μV
kHz
Ω
V
V
°C
°C
Power Analog Microelectronics
,
Inc
www.poweranalog.com
4
09/2008 Rev 1.2
PAM8302A
2.5W Filterless Class-D Mono Audio Amplifier
Typical Performance Characteristics
T
A
=25 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
O
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=0.1 μ F, Gain=23dB, V
DD
=5V
10
5
THD+N VS Frequency
R
L
=8
Ω
, Cin=0.1 μ F, 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=0.1 μ F, Gain=23dB, V
DD
=5V
10
5
2
THD+N VS Frequency
R
L
=4
Ω
, Cin=0.1 μ F, 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
09/2008 Rev 1.2
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
