PAM8302
Tiny Package 2 Watt Class-D Audio Amplifiers With Enable
DESCRIPTION
The PAM8302 is a 2 Watt, 8-pin, class D audio
amplifier with Enable function, it offers low THD+N
(0.10%), allowing it to produce high-quality sound
reproduction.
The PAM8302 runs off of a 5 Volt supply at much
higher efficiencies than their class AB cousins,
making it ideal for many portable applications.
The PAM8302 only requires very few external
components (as few as two tiny capacitors), results
in significant cost and board space savings.
The PAM8302 is available in a SOP8 package.
FEATURES
2 Watts @ 10% THD output into a 4 load at 5V
Support speakers or earphone (4 to 32 ).
With Enable function.
Superior low noise without input.
Supply voltage from 2.5V to 5.5V.
85% efficiency above.
Short Circuit Protection.
Less output capacitor and inductor to save the
space and cost.
Low THD+N
Low quiescent current < 10 mA
APPLICATIONS
Notebook Computers.
PDAs/ GPS Navigator/ e-Dictionary
Portable DVD Players, Game Machines.
Cellular Phones, VoIP Phones, Screen Phones
MP3 or PMP Players.
Portable Speaker System, Portable Amplifier
LCD monitor / TV.
Bluetooth Car-Kit
TYPICAL APPLICATION CIRCUIT
Vdd
33 H
VDD
0.47 F
Input
10K
IN
+OUT
0.47 F
Speaker
33 H
Enable
GND
-OUT
0.47 F
Power Analog Microelectronics, Inc.
CONFIDENTIAL. DO NOT DISTRIBUTE OR REPRODUCE WITHOUT PERMISSION FROM P.A.M.
1
PAM8302 data sheet, Rev. 0.1
CONFIDENTIAL INFORMATION
PAM8302
Tiny Package 2 Watt Class-D Audio Amplifiers With Enable
TOP MARKING & PIN CONFIGURATION
8
7
6
5
Absolute Maximum Ratings:
Supply voltage: *6V
Input voltage:
-0.3V to VDD +0.3V
Operation Temperature range:
40
O
C to 85
O
C
Operation junction temperature:
-40
O
C to 125
O
C
Storage Temperature:
-65
O
C to 150
O
C
Maximum Junction Temperature:
150
O
C
Soldering temperature:
250
O
C, 10 secretary
A Y WW
AYWW
1
2
3
4
Weekly
Year
Assembly Location
SOP8
Recommended operating Conditions:
Supply voltage Range:
2.5V to 5.5V
Operation Temperature Range:
-40
O
C to 85
O
C
Junction Temperature Range:
-40
O
C to 125
O
C
Pin Description
Pin No.
1
2
3
4
5
6
7
8
Pin Name
IN_R
VDD
EN
GND
NC
GND
+OUT
-OUT
Description
Right channel audio input.
Supply voltage, need a 1uF ceramic
decouple capacitor very close bet
ween this pin to GND pin.
Chip enable, high active.
GNDChip ground.
Not connected
Chip ground.
Non-inverted output
Inverted output
Thermal Information:
Thermal Resistance (
SOP8:
DIP8
JA
JC
):
90
O
C/W
O
C/W
*
Note: Without input signal.
ORDERING INFORMATION
Ordering
Number
Package
Shipping
2,500 Units/ Reel
PAM8302S8R SOP-8
ELECTRONIC SPECIFICATIONS
PARAMETER
Vdd Range
Vdd Quiescent current
SW On Resistance
SW Frequency
PSRR
Gain
SNR
Input impedance
Each channel
VDD = 5V
No Input Signal
VDD = 2.5V to 5.5V
VDD = 2.5V to 5.5V, 0 input resistor
VDD = 5V, Po = 1.5W, 8
Load
100
0.4
500
-45
10
60
kHz
dB
V/V
dB
K
CONDITION
MIN
2.5
TYP
5
MAX
5.5
10
UNITS
V
mA
Power Analog Microelectronics, Inc.
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CONFIDENTIAL INFORMATION
PAM8302
Tiny Package 2 Watt Class-D Audio Amplifiers With Enable
BLOCK DIAGRAM
Vdd
C1
Input Signal
1 F
Enable
1
Bit
Speaker
Controller
Over Current
TEST CIRCUIT FOR GRAPHS
PAM8302 Demo Board
+OUT
Input
AP System One
Generator
GND
-OUT
VDD
Load
AP
Low Pass
Filter
AUX-0025
AP System One
Analyzer
Power Supply
Notes:
1.The AP AUX-0025 low pass filter is necessary for every class D amplifier measurement done by AP analyzer.
2.A 33 H inductor is used in series with load resistor to emulate the small speaker for efficiency measurement.
Power Analog Microelectronics, Inc.
CONFIDENTIAL. DO NOT DISTRIBUTE OR REPRODUCE WITHOUT PERMISSION FROM P.A.M.
3
CONFIDENTIAL INFORMATION
PAM8302
Tiny Package 2 Watt Class-D Audio Amplifiers With Enable
(%)
100
50
20
10
5
2
1
0.5
0.2
0.1
0.05
0.02
0.01
(W)
(%)
100
50
20
10
5
2
1
0.5
0.2
0.1
0.05
0.02
0.01
(W)
Ap
Ap
1
600u
100m
200m
500m
600u
100m
200m
500m
1m
2m
5m
10m
20m
50m
1m
2m
5m
10m
20m
50m
2
3
1
THD+N vs. Output Power
8 , 1kHz, VDD = 5V
(%)
100
50
20
10
5
2
1
0.5
0.2
0.1
0.05
0.02
0.01
20
(Hz)
20k
0%
0
Efficiency
100%
THD+N vs. Output Power
4 , 1kHz, VDD = 5V
Efficiency VS Output Power
Ap
80%
60%
40%
20%
1
Power
2
2
3
3
50
100 200
500
1k
2k
5k
1
10k
THD+N vs. Frequency
8 , 500mW output, VDD = 5V
1.4
1.2
Power Dissipation -W
1.0
0.8
0.6
0.4
0.2
0.0
(dBr)
+0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
20
Power Dissipation vs. Output Power
4 , 1kHz, VDD = 5V
0
0.5
1
Output Power -W
1.5
2
(Hz)
50
100
200
500
1k
2k
5k
10k 20k
Power Dissipation vs. Output Power
4 , 1kHz, VDD = 5V
Class AB = Blue line
PAM8202 = Magenta line
Power Analog Microelectronics, Inc.
CONFIDENTIAL. DO NOT DISTRIBUTE OR REPRODUCE WITHOUT PERMISSION FROM P.A.M.
FFT Noise Floor
(16k FFT)
4
CONFIDENTIAL INFORMATION
PAM8302
Tiny Package 2 Watt Class-D Audio Amplifiers With Enable
OPERATION INFORMATION
Calculating Output Power of BTL amplifier
Output power is related to supply voltage and the saturation
Vsupply
Vsat
voltage (Vsat). The Maximum peak-to-peak output voltage
on one side of BTL amplifier output is
Vp-p = ( Vsupply - 2 X Vsat )
Vp-p
2 2
Vpk-pk
Vrms =
Vsat
Vsupply
One side
Maximum output power of a BTL amplifier with 1% THD is
Pout (1%) = 4 X Vrms
2
/ Rload
Maximum output power of a BTL amplifier with 10% THD is
Pout (10%) = Pout (1%) X 1.25
Output Power vs. Vp-p
BTL Output Power
5.0
Output Power @THD 10%
4.0
4
3.0
2.0
8
1.0
0.0
0
1
2
3
4
Vdd - Vsat (V)
5
6
Power Analog Microelectronics, Inc.
CONFIDENTIAL. DO NOT DISTRIBUTE OR REPRODUCE WITHOUT PERMISSION FROM P.A.M.
5
CONFIDENTIAL INFORMATION
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