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PAM8303D
Ultra Low EMI, 3W Filterless Mono Class-D Audio Power Amplifier Key Features
n Ultra Low EMI, -20dB Better Than FCC Class-B @ 300MHz n High Efficiency up to 90% @1W with an 8 Speaker n Shutdown Current <1 A n 3W@10% THD Output with a 4 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
General Description
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.
FCC Class B
Applications
n n n n n n
Cellular Phones/Smart Phones MP4/MP3 GPS Digital Photo Frame Electronic Dictionary Portable Game Machines
Level (dBuV/m)
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 1F 1F 10F 1F 1F
Ci IN Single-ended Input Ci ON OFF
Ri IN-
VDD
PVDD Ci INOUTDifferential Input IN+ OUT+ ON OFF Ri IN-
VDD
PVDD OUT-
PAM8303D Ri IN+ SD GND
Ci
Ri IN+
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
Gate Drive Gate Drive
PVDD OUT+ OUT-
IN-
SD
SD
UVLO
SC Protect
Bias and Vref
OSC
Startup Protection
OTP
GND
Pin Configuration & Marking Information
9 Ball WCSP Top View
IN+ A1 VDD B1 INC1 GND A2 PVDD B2 SD C2 OUTA3 GND B3 OUT+ 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 4
8 7 6 5
P8303D XXXXYW
X: Internal Code Y: Year W: Week
MSOP-8 Top View 1 8
P8303D XXXXYW
2 3 4
7 6 5
Pin Number 1 2 3 4 5 6 7 8
Pin name OUT+ PVDD VDD ININ+
SD
Description Positive BTL output Power supply Analog power supply Negative differential input Positive differential input Shutdown terminal ,active low Ground Negative BTL output
GND OUT-
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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.....................-65C to 150 C Soldering Temperature.................... 250C,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)
Symbol
Package
WCSP 1.45x1.45
Maximum
90-220 180 47.9 40 NA
Unit
C/W C/W C/W C/W C/W
JA
MSOP DFN 3x3
Thermal Resistance (Junction to case)
MSOP JC DFN 3x3
Note: For the 9-pin CSP package, the thermal resistance is highly dependent on the PCB heat sink area. For example, the 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
Symbol VDD Parameter Supply Voltage V DD =5.0V THD+N=10%,f=1kHz, R=4 V DD =3.6V V DD =3.2V V DD =5.0V THD+N=1%,f=1kHz, R=4 Po Output Power THD+N=10%,f=1kHz, R=8 V DD =3.6V V DD =3.2V V DD =5.0V V DD =3.6V V DD =3.2V V DD =5.0V THD+N=1%,f=1kHz, R=8 V DD=5.0V,Po=1W,R=8 VDD=3.6V,Po=0.1W,R=8 THD+N Total Harmonic Distortion Plus Noise VDD=3.2V,Po=0.1W,R=8 VDD=5.0V,Po=0.5W,R=4 VDD=3.6V,Po=0.2W,R=4 VDD=3.2V,Po=0.1W,R=4 PSRR Dyn Vn Power Supply Ripple Rejection Dynamic Range Output Noise Common Mode Rejection Ratio V DD =3.6V, Inputs ac-grounded with C=1F VDD=5V, THD=1%, R=8 Inputs ac-grounded A-weighting CMRR V IC =100mVpp,f=1kHz 40 30 63 60 dB f=217Hz f=1kHz f=10kHz f=1kHz 85 f=1kHz f=1kHz V DD =3.6V V DD =3.2V
T A=25 C, V DD=5V, Gain=2V/V, R L=L(33 H)+R+L(33 H), unless otherwise noted .
Test Conditions MIM 2.8 2.85 1.65 1.20 2.50 1.15 0.85 1.65 0.75 0.55 1.3 0.55 0.40 3.0 1.8 1.35 2.66 1.3 1 1.8 0.9 0.7 1.5 0.72 0.55 0.28 0.4 0.55 0.2 0.35 0.5 -63 -62 -52 95 50 100 V 0.35 0.45 0.6 0.25 0.4 0.55 -55 -55 -40 dB % % W W W W TYP MAX 5.5 UNIT V
No A-weighting
(To Be Cont'd)
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PAM8303D
Ultra Low EMI, 3W Filterless Mono Class-D Audio Power Amplifier Electrical Characteristic (continued)
Symbol Parameter Efficiency
T A=25 C, V DD=5V, Gain=2V/V, R L=L(33 H)+R+L(33 H), unless otherwise noted .
Test Conditions R L=8, THD=10% R L=4, THD=10% V DD =5V IQ ISD Quiescent Current Shutdown Current V DD =3.6V V DD =3.0V V DD =3V to 5V PMOS plus Low Side Rdson Static Drain-to-source On-state Resistor NMOS, I=500mA MSOP/DFN package High Side PMOS plus Low Side NMOS, I=500mA Ri fsw Gv Vos VIH VIL Input Resistance Switching Frequency Closed-loop Gain Output Offset Voltage Enable Input High Voltage Enable Input Low Voltage V DD =3V to 5V V DD =3V to 5V Input ac-ground,VDD =5V V DD =5V V DD =5V 1.5 0.3 200 V SD=0.3V V DD =3.6V V DD =3V V DD =5V V DD =3.6V V DD =3V CSP package High Side V DD =5V R =8 f=1kHz MIM 85 80 TYP 90 86 7.5 4.6 3.6 0.5 280 300 325 365 385 410 150 250 300k/Ri 10 50 300 10 7 5 2 350 375 400 420 450 500 k kHz V/V mV V m m A mA MAX UNIT %
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PAM8303D
Ultra Low EMI, 3W Filterless Mono Class-D Audio Power Amplifier Typical Operating Characteristics
1. Efficiency VS Output Power
100 90 80
Efficiency (%)
Efficiency (%)
100 90 80
T A=25 C, V DD=5V, f=1kHz, Gain=2V/V, unless otherwise noted . 2. Efficiency VS Output Power
70 60 50 40 30 20 10 0 0
V DD=5V V DD=3.6V
70 60 50 40 30 20
V DD=5V V DD=3.6V
R L=8
0.5 1 Output Pow er (W) 1.5 2
10 0 0 0.5 1 1.5 2 Output Pow er (W)
R L=4
2.5 3
Audio Precision
3. THD+N VS Output Power
30 20 10 5
4. THD+N VS Output Power
30 20 10
R L=8 BW=22Hz ~22kHz
R L=4 BW=22Hz ~22kHz
V DD=3.6V
V DD=3.2V
%
5
V DD=3.6V
%
2 1 0.5 0.2 0.1 30m
2
V DD=3.2V
1 0.5 0.2 0.1 10m
V DD=5.0V
50m 100m 200m W 500m 1 2 3
V DD=5.0V
20m 50m 100m 200m W 500m 1 2 4
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PAM8303D
Ultra Low EMI, 3W Filterless Mono Class-D Audio Power Amplifier Typical Operating Characteristics
5. THD+N VS Frequency
10
T A=25 C, V DD=5V, f=1kHz, Gain=2V/V, unless otherwise noted . 6. THD+N VS Frequency
R L=4 ,V DD=3.6V BW=10Hz ~30kHz
10
5
R L=4 ,V DD=5V BW=10Hz ~30kHz
5
2
2
Po=1W
%
1
Po=1W Po=400mW
%
1
0.5
0.5
0.2
0.2
Po=150mW
50 100 200 500 Hz 1k 2k 5k 10k 20k
0.1 20
50
100
200
500 Hz
1k
2k
5k
10k
20k
0.1 20
7. THD+N VS Frequency
10
10
8. THD+N VS Frequency
5
5
R L=8 ,V DD=5V BW=10Hz ~30kHz
R L=8 ,V DD=3.6V BW=10Hz ~30kHz
2
2
Po=400mW
% 1
% 1
Po=100mW
0.5
0.5
0.2
0.2
Po=1W
0.1 20 50 100 200 500 Hz 1k 2k 5k 10k 20k
0.1 20 50 100 200
Po=500mW
500 Hz 1k 2k 5k 10k 20k
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PAM8303D
Ultra Low EMI, 3W Filterless Mono Class-D Audio Power Amplifier Typical Operating Characteristics
9. Frequency Response
+5 +4 +3
-20 +0
T A=25 C, V DD=5V, f=1kHz, Gain=2V/V, unless otherwise noted . 10. PSRR VS Frequency
T T
-10
Gain=0dB@1kHz Po=400mW
Inputs ac-ground V DD=3.6V, Vripp=100mVpp,
+2 d B r A +1 +0 -1 -2
-60 d B -30 -40 -50
-3 -4 -5 20
-70 -80 10
50
100
200
500 Hz
1k
2k
5k
10k
20k
20
50
100
200
500
1k Hz
2k
5k
10k
20k
50k 100k
-30 -35 -40 -45 d B r A -50 -55 -60 -65 -70 -75
11. CMRR vs Frequency
+0 -1 0 -2 0 -3 0 -4 0 -5 0 d B r A -6 0 -7 0 -8 0 -9 0 -1 0 0 -1 1 0 -1 2 0 -1 3 0 -1 4 0
12. Noise FFT
Inputs ac-ground
-80 20
50
100
200
500 H z
1k
2k
5k
10k
20k
-1 5 0 20
50
100
200
500 Hz
1k
2k
5k
10k
20k
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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 .
12
Power Supply Voltage (V)
13. Quiescent Current vs Power Supply Voltage
12
14. Shutdown Voltage vs Shutdown Current
10 8 6 4 2 0 3 3.5 4 4.5
R L=8
Shutdown Current(uA)
10 8 6 4
V DD=5V
No load
V DD=3V
2 0
V DD=3.6V
5
5.5
0
0.2
0.4 Shutdow n Voltage (V)
0.6
0.8
Quiescent Current (mA)
15. Output Power vs Supply Voltage
2.5
3.5
16. Output Power vs Supply Voltage R L=4
R L=8
2
3
Output Power (V)
THD=10%
1.5
Output Power (W)
2.5 2 1.5 1 0.5
THD=10%
1
THD=1%
0.5
THD=1%
0 3 3.5 4 4.5 5 5.5 Supply Voltage (V)
0 3 3.5 4 Supply Voltage (V) 4.5 5
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PAM8303D
Ultra Low EMI, 3W Filterless Mono Class-D Audio Power Amplifier Typical Operating Characteristics
17. OSC Frequency
300 290 280
Input ac-ground
T A=25 C, V DD=5V, f=1kHz, Gain=2V/V, unless otherwise noted .
300 280 260 240
18. Rdson vs Supply Voltage
Isw=500mA 100% duty cycle
Frequency (KHz)
Rdson (m)
270 260 250 240 230 220 210 200 2.7 3.4 4.1 Supply Voltage (V) 4.8 5.5
PMOS
220 200 180 160 140 120 100 3 3.5 4 Supply Voltage (V) 4.5 5
NOMS
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 VDD AUX-0025 AP System One Analyzer
Power Supply
Notes
1. The AP AUX-0025 low pass filter is necessary for class-D amplifier measurement with AP analyzer. 2. Two 22H 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) The input resistors (Ri) set the gain of the amplifier according to Equation 1. 2 150kW ae V o Gain = c/ Ri eVo 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%. Place the input resistors very close to the PAM8303D to limit noise injection on the highimpedance nodes. 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) 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 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. 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. 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. 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 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 F or greater placed near the audio power amplifier is recommended. 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 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. 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. Over Temperature Protection (OTP) Thermal protection on the PAM8303D prevents the device from damage when the internal die temperature exceeds 135C. 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. POP and Click Circuitry 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. 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. Power Supply Line 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.
Figure 2: Power Line Components Placement Decoupling capacitors-As previously described, the high-frequency 1 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 F or greater) should be placed near the PAM8303D on the PVDD terminal. 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.
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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 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: OUTPackage Type Z: WCSP Y: DFN 3x3 S: MSOP Number of pins C: 8 N: 9
Part Number PAM8303DAZN PAM8303DBYC PAM8303DBSC
Marking BC YW P8303D XXXXYW P8303D XXXXYW
Package Type WCSP 9 DFN 3x3 MSOP-8
MOQ 3,000 Units/ Tape & Reel 3,000 Units/ Tape & Reel 2,500 Units/ Tape & Reel
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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
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PAM8303D
Ultra Low EMI, 3W Filterless Mono Class-D Audio Power Amplifier Outline Dimensions
MSOP8
REF A A1 A2 b c D E E1 e L
Millimeter Min -0.05 0.78 0.22 0.08 2.90 2.90 4.75 0.65BSC 0.40 0.70 Max 1.10 0.15 0.94 0.38 0.23 3.10 3.10 5.05
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PAM8303D
Ultra Low EMI, 3W Filterless Mono Class-D Audio Power Amplifier Outline Dimensions
DFN 3x3
DFN
Unit: Millimeter
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