PAM PAM8303D

PAM8303D
Ultra Low EMI, 3W Filterless
Mono Class-D Audio Power Amplifier
Key Features
General Description
n Ultra Low EMI, -20dB Better Than FCC
Class-B @ 300MHz
n High Efficiency up to 90% @1W with an 8 Ω
Speaker
n Shutdown Current <1 μ A
n 3W@10% THD Output with a 4 Ω Load at 5V
Supply
n Demanding Few External Components
n Superior Low Noise without Input
n Supply Voltage from 2.8V to 5.5 V
n Short Circuit Protection
n Thermal Shutdown
n Available in Space Saving Packages:
1.45mmx1.45mm WCSP9, MSOP-8, DFN 3x3
n Pb-Free Package
The PAM8303D is a 3W mono filterless class-D
amplifier with high PSRR and differential input
that eliminate noise and RF rectification.
Features like 90% efficiency and small PCB area
make the PAM8303D class-D amplifier ideal for
cellular handsets. The filterless architecture
requires no external output filter, fewer external
components, less PCB area and lower system
costs, and simplifies application design.
The PAM8303D features short circuit protection
and thermal shutdown.
The PAM8303D is available in 9-ball WCSP,
MSOP-8 and DFN 3x3 8-pin packages.
Applications
n
n
n
n
n
n
Level (dBuV/m)
Cellular Phones/Smart Phones
MP4/MP3
GPS
Digital Photo Frame
Electronic Dictionary
Portable Game Machines
FCC
Class B
80
70
60
50
40
30
20
10
0
30.00 100.00
200.00
300.00
400.00
500.00
600.00
700.00
800.00
900.00
1000.00
( MHz)
EMI vs Frequency
Typical Application Circuit
Power in
to PVDD pin
to VDD pin
1μF
Ci
VDD
Ri
10μF
1μF
PVDD
1μF
VDD
Ci
IN-
IN
1μF
PVDD
Ri
IN-
IN-
OUTSingle-ended
Input
Ci
OUTDifferential
Input
PAM8303D
Ri
IN+
IN+
OUT+
ON
OFF
OFF
GND
Ri
IN+
ON
SD
Ci
PAM8303D
OUT+
SD
GND
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PAM8303D
Ultra Low EMI, 3W Filterless
Mono Class-D Audio Power Amplifier
Block Diagram
VDD
IN+
PWM
Modulator
+
IN-
SD
SD
Bias and
Vref
OSC
PVDD
Gate
Drive
OUT+
Gate
Drive
OUT-
UVLO
SC
Protect
Startup
Protection
OTP
GND
Pin Configuration & Marking Information
9 Ball WCSP
Top View
IN+
GND
OUT-
A1
A2
A3
VDD
PVDD
GND
B1
B2
B3
IN-
SD
OUT+
C1
C2
C3
Marking
BC
YW
BC: Product Code of PAM8303D
Y: Year
W: Week
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PAM8303D
Ultra Low EMI, 3W Filterless
Mono Class-D Audio Power Amplifier
Pin Configuration & Marking Information
DFN
Top View
1
2
3
8
P8303D
XXXXYW
4
X: Internal Code
Y: Year
W: Week
7
6
5
MSOP-8
Top View
1
8
P8303D
XXXXYW
2
3
7
6
5
4
Pin Number
1
Pin name
OUT+
Description
2
PVDD
3
VDD
4
IN-
Negative differential input
5
IN+
Positive differential input
6
SD
Shutdown terminal ,active low
7
GND
Ground
8
OUT-
Negative BTL output
Positive BTL output
Power supply
Analog power supply
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PAM8303D
Ultra Low EMI, 3W Filterless
Mono Class-D Audio Power 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 . ...........................................6.6V
Input Voltage.............................-0.3V to V DD+0.3V
Junction Temperature....................-40 °C to 125 °C
Storage Temperature.....................-65°C to 150 °C
Soldering Temperature.................... 250°C,10 sec
Recommended Operating Conditions
Supply voltage Range........................ 2.8V to 5.5V
Max. Supply Voltage (for Max. duration of
30 minutes)................................................6.4V
Ambient Operation Temperature.......-20 °C to 85 °C
Thermal Information
Parameter
Thermal Resistance
(Junction to ambient)
Thermal Resistance
(Junction to case)
Symbol
Package
Maximum
Unit
WCSP 1.45x1.45
90-220
°C/W
MSOP
180
°C/W
DFN 3x3
47.9
°C/W
MSOP
40
°C/W
DFN 3x3
NA
°C/W
θJA
θJC
Note: For the 9-pin CSP package, the thermal resistance is highly dependent on the PCB heat sink area.
For example, the θ ja can equal to 195 °C /W with 50mm 2 total area or 135 °C /W with 500mm 2 area. When
using ground and power planes, the value is around 90 °C /W.
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PAM8303D
Ultra Low EMI, 3W Filterless
Mono Class-D Audio Power Amplifier
Electrical Characteristic
T A=25 ° C, V DD=5V, Gain=2V/V, R L=L(33 μ H)+R+L(33 μ H), unless otherwise noted .
Symbol
VDD
Parameter
Test Conditions
Supply Voltage
THD+N=1%,f=1kHz, R=4Ω
Output Power
THD+N=10%,f=1kHz, R=8Ω
THD+N=1%,f=1kHz, R=8Ω
V DD =5.0V
2.85
3.0
V DD =3.6V
1.65
1.8
V DD =3.2V
1.20
1.35
V DD =5.0V
2.50
2.66
V DD =3.6V
1.15
1.3
V DD =3.2V
0.85
1
V DD =5.0V
1.65
1.8
V DD =3.6V
0.75
0.9
V DD =3.2V
0.55
0.7
V DD =5.0V
1.3
1.5
V DD =3.6V
0.55
0.72
V DD =3.2V
0.40
0.55
V DD=5.0V,Po=1W,R=8Ω
VDD=3.6V,Po=0.1W,R=8Ω
THD+N
f=1kHz
UNIT
5.5
V
W
W
W
W
0.28
0.35
0.4
0.45
VDD=3.2V,Po=0.1W,R=8Ω
0.55
0.6
Distortion Plus Noise
VDD=5.0V,Po=0.5W,R=4Ω
0.2
0.25
0.35
0.4
0.5
0.55
f=217Hz
-63
-55
f=1kHz
-62
-55
f=10kHz
-52
-40
f=1kHz
VDD=3.2V,Po=0.1W,R=4Ω
Power Supply Ripple
Rejection
Dyn
Dynamic Range
Vn
Output Noise
CMRR
MAX
Total Harmonic
VDD=3.6V,Po=0.2W,R=4Ω
PSRR
TYP
2.8
THD+N=10%,f=1kHz, R=4Ω
Po
MIM
Common Mode
Rejection Ratio
V DD =3.6V, Inputs ac-grounded
with C=1μF
VDD=5V, THD=1%, R=8Ω
f=1kHz
85
%
%
dB
95
No A-weighting
50
100
A-weighting
30
60
Inputs ac-grounded
μV
V IC =100mVpp,f=1kHz
40
63
dB
(To Be Cont’d)
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PAM8303D
Ultra Low EMI, 3W Filterless
Mono Class-D Audio Power Amplifier
Electrical Characteristic (continued)
T A=25 ° C, V DD=5V, Gain=2V/V, R L=L(33 μ H)+R+L(33 μ H), unless otherwise noted .
Symbol
η
Parameter
Efficiency
Test Conditions
R L=8Ω, THD=10%
R L=4Ω, THD=10%
f=1kHz
MIM
TYP
85
90
80
86
V DD =5V
IQ
Quiescent Current
10
4.6
7
3.6
5
0.5
2
CSP package，High Side V DD =5V
280
350
PMOS plus Low Side
V DD =3.6V
300
375
NMOS, I=500mA
V DD =3V
325
400
MSOP/DFN package，
V DD =5V
365
420
High Side PMOS plus
V DD =3.6V
385
450
V DD =3V
410
500
V DD =3.6V
R =8Ω
Rdson
Shutdown Current
Static Drain-to-source
On-state Resistor
V DD =3V to 5V
V SD=0.3V
Low Side NMOS,
I=500mA
Ri
Input Resistance
fsw
Switching Frequency
V DD =3V to 5V
150
Gv
Closed-loop Gain
V DD =3V to 5V
Vos
Output Offset Voltage
Input ac-ground,VDD =5V
VIH
Enable Input High Voltage
V DD =5V
VIL
Enable Input Low Voltage
V DD =5V
200
250
mA
μA
mΩ
mΩ
kΩ
300
300kΩ/Ri
10
UNIT
%
7.5
V DD =3.0V
ISD
MAX
kHz
V/V
50
1.5
0.3
mV
V
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PAM8303D
Ultra Low EMI, 3W Filterless
Mono Class-D Audio Power Amplifier
Typical Operating Characteristics
T A=25 ° C, V DD=5V, f=1kHz, Gain=2V/V, unless otherwise noted .
100
90
90
80
80
70
V DD=5V
60
50
Efficiency (%)
Efficiency (%)
1. Efficiency VS Output Power
100
V DD=3.6V
40
30
2. Efficiency VS Output Power
70
V DD=5V
60
50
V DD=3.6V
40
30
20
20
10
10
R L=8 Ω
0
0
0.5
1
1.5
R L=4 Ω
0
2
0
0.5
1
1.5
2
2.5
3
Output Pow er (W)
Output Pow er (W)
Audio Precision
3. THD+N VS Output Power
30
20
4. THD+N VS Output Power
30
20
R L=8 Ω
BW=22Hz ~22kHz
10
10
5
%
V DD=3.2V
%
2
V DD=3.2V
1
1
0.5
0.5
0.2
0.2
V DD=5.0V
50m
100m
200m
500m
V DD=3.6V
5
V DD=3.6V
2
0.1
30m
R L=4 Ω
BW=22Hz ~22kHz
1
2
0.1
10m
3
W
V DD=5.0V
20m
50m
100m
200m
500m
1
2
4
W
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PAM8303D
Ultra Low EMI, 3W Filterless
Mono Class-D Audio Power Amplifier
Typical Operating Characteristics
T A=25 ° C, V DD=5V, f=1kHz, Gain=2V/V, unless otherwise noted .
5. THD+N VS Frequency
5
R L=4 Ω,V DD=5V
BW=10Hz ~30kHz
R L=4 Ω,V DD=3.6V
BW=10Hz ~30kHz
5
2
2
%
6. THD+N VS Frequency
10
10
Po=1W
1
%
Po=1W
1
Po=400mW
0.5
0.5
0.2
0.2
0.1
20
50
100
200
500
1k
2k
5k
10k
Po=150mW
0.1
20
20k
50
100
200
7. THD+N VS Frequency
R L=8 Ω,V DD=5V
BW=10Hz ~30kHz
5
5k
10k
20k
2k
5k
10k
20k
R L=8 Ω,V DD=3.6V
BW=10Hz ~30kHz
2
Po=400mW
Po=100mW
1
%
1
0.5
0.5
0.2
0.2
Po=1W
0.1
20
2k
10
2
%
1k
8. THD+N VS Frequency
10
5
500
Hz
Hz
50
100
200
500
1k
2k
5k
Po=500mW
10k
0.1
20
20k
50
100
200
500
1k
Hz
Hz
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PAM8303D
Ultra Low EMI, 3W Filterless
Mono Class-D Audio Power Amplifier
Typical Operating Characteristics
T A=25 ° C, V DD=5V, f=1kHz, Gain=2V/V, unless otherwise noted .
9. Frequency Response
10. PSRR VS Frequency
+5
+0
Gain=0dB@1kHz
Po=400mW
+4
T
T
Inputs ac-ground
V DD=3.6V, Vripp=100mVpp,
-10
+3
-20
+2
d
B
r
+1
A
-1
-30
d
B
+0
-40
-50
-2
-60
-3
-70
-4
-5
20
50
100
200
500
1k
2k
5k
10k
-80
10
20k
20
50
100
200
500
1k
-30
2k
5k
10k
20k
50k 100k
Hz
Hz
11. CMRR vs Frequency
+0
12. Noise FFT
-1 0
-35
Inputs ac-ground
-2 0
-40
-3 0
-45
-4 0
-5 0
d
B
r
-50
-55
d
B
r
A
-60
A
-6 0
-7 0
-8 0
-9 0
-1 0 0
-65
-1 1 0
-70
-1 2 0
-75
-1 3 0
-1 4 0
-80
20
50
100
200
500
1k
2k
5k
10k
-1 5 0
20
20k
Hz
50
100
200
500
1k
2k
5k
10k
20k
Hz
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PAM8303D
Ultra Low EMI, 3W Filterless
Mono Class-D Audio Power Amplifier
Typical Operating Characteristics
T A=25 ° C, V DD=5V, f=1kHz, Gain=2V/V, unless otherwise noted .
13. Quiescent Current vs Power Supply Voltage
12
R L=8 Ω
10
14. Shutdown Voltage vs Shutdown Current
10
Shutdown Current(uA)
Power Supply Voltage (V)
12
8
No load
6
4
2
V DD=5V
8
6
4
2
0
0
3
3.5
4
4.5
5
0
5.5
0.2
0.4
0.6
0.8
Shutdow n Voltage (V)
Quiescent Current (mA)
15. Output Power vs Supply Voltage
2.5
16. Output Power vs Supply Voltage
3.5
R L=4 Ω
R L=8 Ω
3
Output Power (W)
2
Output Power (V)
V DD=3.6V
V DD=3V
THD=10%
1.5
1
THD=1%
THD=10%
2.5
2
1.5
THD=1%
1
0.5
0.5
0
0
3
3.5
4
4.5
5
5.5
3
Supply Voltage (V)
3.5
4
4.5
5
Supply Voltage (V)
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PAM8303D
Ultra Low EMI, 3W Filterless
Mono Class-D Audio Power Amplifier
Typical Operating Characteristics
T A=25 ° C, V DD=5V, f=1kHz, Gain=2V/V, unless otherwise noted .
17. OSC Frequency
300
300
Input ac-ground
Isw=500mA
100% duty cycle
280
280
260
270
240
Rdson (mΩ)
Frequency (KHz)
290
18. Rdson vs Supply Voltage
260
250
240
PMOS
220
200
180
230
160
220
140
210
120
NOMS
100
200
2.7
3.4
4.1
4.8
3
5.5
3.5
Supply Voltage (V)
4
Supply Voltage (V)
4.5
5
19. Start-up from Shutdown
Output
SD
Test Setup for Performance Testing
PAM8303D Demo Board
Load
+OUT
AP System One
Generator
Input
AP
Low Pass
Filter
GND
-OUT
AP System One
Analyzer
AUX-0025
VDD
Power Supply
Notes
1. The AP AUX-0025 low pass filter is necessary for class-D amplifier measurement with AP analyzer.
2. Two 22μH inductors are used in series with load resistor to emulate the small speaker for efficiency
measurement.
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PAM8303D
Ultra Low EMI, 3W Filterless
Mono Class-D Audio Power Amplifier
Application Information
Input Resistance (Ri)
For this reason, a low-leakage tantalum or
ceramic capacitor is the best choice. When
polarized capacitors are used, the positive side
of the capacitor should face the amplifier input in
most applications as the DC level is held at V DD/2,
which is likely higher than the source DC level.
Please note that it is important to confirm the
capacitor polarity in the application.
The input resistors (Ri) set the gain of the
amplifier according to Equation 1.
2 ´ 150kW æ V ö
Gain =
ç ÷
Ri
èVø
Resistor matching is very important in fully
differential amplifiers. The balance of the output
on the reference voltage depends on matched
ratios of the resistors. CMRR, PSRR, and
cancellation of the second harmonic distortion
diminish if resistor mismatch occurs. Therefore,
it is recommended to use 1% tolerance resistors
or better to keep the performance optimized.
Matching is more important than overall
tolerance. Resistor arrays with 1% matching can
be used with a tolerance greater than 1%.
Decoupling Capacitor (C S )
The PAM8303D is a high-performance CMOS
audio amplifier that requires adequate power
supply decoupling to ensure the output total
harmonic distortion (THD) as low as possible.
Power supply decoupling also prevents the
oscillations causing by long lead length between
the amplifier and the speaker.
Place the input resistors very close to the
PAM8303D to limit noise injection on the highimpedance nodes.
The optimum decoupling is achieved by using
two different types of capacitors that target on
different types of noise on the power supply
leads. For higher frequency transients, spikes, or
digital hash on the line, a good low equivalentseries-resistance (ESR) ceramic capacitor,
typically 1 μ F, is placed as close as possible to
the device each VDD and PVDD pin for the best
operation. For filtering lower frequency noise
signals, a large ceramic capacitor of 10 μ F or
greater placed near the audio power amplifier is
recommended.
For optimal performance the gain should be set
to 2X(Ri=150k) or lower. Lower gain allows the
PAM8303D to operate at its best, and keeps a
high voltage at the input making the inputs less
susceptible to noise. In addition to these
features, higher value of Ri minimizes pop noise.
Input Capacitors (Ci )
In the typical application, an input capacitor, Ci,
is required to allow the amplifier to bias the input
signal to the proper DC level for optimum
operation. In this case, Ci and the minimum input
impedance Ri form is a high-pass filter with the
corner frequency determined in the follow
equation:
1
fC =
(2p RiCi)
How to Reduce EMI
Most applications require a ferrite bead filter for
EMI elimination shown at Figure 1. The ferrite
filter reduces EMI around 1MHz and higher.
When selecting a ferrite bead, choose one with
high impedance at high frequencies, but low
impedance at low frequencies.
Ferrite Bead
It is important to consider the value of Ci as it
directly affects the low frequency performance of
the circuit. For example, when Ri is 150k Ω and
the specification calls for a flat bass response
are down to 150Hz. Equation is reconfigured as
followed:
1
Ci =
(2p Rifc )
When input resistance variation is considered,
the Ci is 7nF, so one would likely choose a value
of 10nF. A further consideration for this capacitor
is the leakage path from the input source through
the input network ( Ci , Ri + Rf ) to the load. This
leakage current creates a DC offset voltage at
the input to the amplifier that reduces useful
headroom, especially in high gain applications.
OUT+
200pF
Ferrite Bead
OUT-
200pF
Figure 1: Ferrite Bead Filter to Reduce EMI
Shutdown operation
In order to reduce power consumption while not
in use, the PAM8303D contains shutdown
circuitry that is used to turn off the amplifier’s
bias circuitry. This shutdown feature turns the
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PAM8303D
Ultra Low EMI, 3W Filterless
Mono Class-D Audio Power Amplifier
amplifier off when logic low is placed on the SD
pin. By switching the shutdown pin connected to
GND, the PAM8303D supply current draw will be
minimized in idle mode.
PCB Layout Guidelines
Grounding
It is recommended to use plane grounding or
separate grounds. Do not use one line
connecting power GND and analog GND. Noise
currents in the output power stage need to be
returned to output noise ground and nowhere
else. When these currents circulate elsewhere,
they may get into the power supply, or the signal
ground, etc, even worse, they may form a loop
and radiate noise. Any of these instances results
in degraded amplifier performance. The output
noise ground that the logical returns for the
output noise currents associated with class D
switching must tie to system ground at the power
exclusively. Signal currents for the inputs,
reference need to be returned to quite ground.
This ground only ties to the signal components
and the GND pin. GND then ties to system
ground.
Under Voltage Lock-out (UVLO)
The PAM8303D incorporates circuitry designed
to detect low supply voltage. When the supply
voltage drops to 2.3V or below, the PAM8303D
goes into a state of shutdown, and the device
comes out of its shutdown state and restore to
normal function only when reset the power
supply or SD pin.
Short Circuit Protection (SCP)
The PAM8303D has short circuit protection
circuitry on the outputs to prevent the device
from damage when output-to-output shorts or
output-to-GND shorts occur. When a short circuit
occurs, the device immediately goes into
shutdown state. Once the short is removed, the
device will be reactivated.
Power Supply Line
Over Temperature Protection (OTP)
As same to the ground, VDD and PVDD need to
be separately connected to the system power
supply. It is recommended that all the trace could
be routed as short and thick as possible. For the
power line layout, just imagine water stream, any
barricade placed in the trace (shown in figure 2)
could result in the bad performance of the
amplifier.
Thermal protection on the PAM8303D prevents
the device from damage when the internal die
temperature exceeds 135°C. There is a 15 °C
tolerance on this trip point from device to device.
Once the die temperature exceeds the set point,
the device will enter the shutdown state and the
outputs are disabled. This is not a latched fault.
The thermal fault is cleared once the
temperature of the die decreased by 30 °C . This
large hysteresis will prevent motor boating sound
well and the device begins normal operation at
this point with no external system interaction.
Figure 2: Power Line
Components Placement
POP and Click Circuitry
Decoupling capacitors-As previously described,
the high-frequency 1 μ F decoupling capacitors
should be placed as close to the power supply
terminals (VDD and PVDD) as possible. Large
bulk power supply decoupling capacitors (10 μ F
or greater) should be placed near the PAM8303D
on the PVDD terminal.
The PAM8303D contains circuitry to minimize
turn-on and turn-off transients or “click and
pops”, where turn-on refers to either power
supply turn-on or device recover from shutdown
mode. When the device is turned on, the
amplifiers are internally muted. An internal
current source ramps up the internal reference
voltage. The device will remain in mute mode
until the reference voltage reach half supply
voltage, 1/2 VDD. As soon as the reference
voltage is stable, the device will begin full
operation. For the best power-off pop
performance, the amplifier should be set in
shutdown mode prior to removing the power
supply voltage.
Input resistors and capacitors need to be placed
very close to input pins.
Output filter - The ferrite EMI filter should be
placed as close to the output terminals as
possible for the best EMI performance, and the
capacitors used in the filters should be grounded
to system ground.
Power Analog Microelectronics , Inc
09/2008 Rev 1.4
www.poweranalog.com
13
PAM8303D
Ultra Low EMI, 3W Filterless
Mono Class-D Audio Power Amplifier
Ordering Information
PAM8303D X X X
Number of pins
Package Type
Pin Configuration
Pin Configuration
A:
A1: IN+
A2: GND
Package Type
Number of pins
Z: WCSP
C: 8
Y: DFN 3x3
N: 9
S: MSOP
A3: OUTB1: VDD
B2: PVDD
B3: GND
C1: INC2: SD
C3: OUT+
B:
1: OUT+
2: PVDD
3: VDD
4: IN5: IN+
6: SD
7: GND
8: OUT-
Part Number
PAM8303DAZN
PAM8303DBYC
PAM8303DBSC
Marking
BC
YW
P8303D
XXXXYW
P8303D
XXXXYW
Package Type
MOQ
WCSP 9
3,000 Units/ Tape & Reel
DFN 3x3
3,000 Units/ Tape & Reel
MSOP-8
2,500 Units/ Tape & Reel
Power Analog Microelectronics , Inc
09/2008 Rev 1.4
www.poweranalog.com
14
PAM8303D
Ultra Low EMI, 3W Filterless
Mono Class-D Audio Power Amplifier
Outline Dimensions
WCSP
1.00
1.45 ± 0.02
0.50
1.45 ± 0.02
Unit: Millimeter
0.235 ± 0.02
0.415 ± 0.04
Power Analog Microelectronics , Inc
09/2008 Rev 1.4
www.poweranalog.com
15
PAM8303D
Ultra Low EMI, 3W Filterless
Mono Class-D Audio Power Amplifier
Outline Dimensions
MSOP8
REF
Millimeter
Min
Max
A
--
1.10
A1
0.05
0.15
A2
0.78
0.94
b
0.22
0.38
c
0.08
0.23
D
2.90
3.10
E
2.90
3.10
E1
4.75
5.05
e
L
0.65BSC
0.40
0.70
Power Analog Microelectronics , Inc
09/2008 Rev 1.4
www.poweranalog.com
16
PAM8303D
Ultra Low EMI, 3W Filterless
Mono Class-D Audio Power Amplifier
Outline Dimensions
DFN 3x3
DFN
Unit: Millimeter
Power Analog Microelectronics , Inc
09/2008 Rev 1.4
www.poweranalog.com
17