®
LY8209
Rev. 1.2
3.3W/CH Stereo Class D Audio Power Amplifier
FEATURES
3.3W Stereo into 4Ω from 5.5V power supply at
THD+N = 10% (Typ.).
2.0W Stereo into 8Ω from 5.5V power supply at
THD+N = 10% (Typ.).
2.5V~5.5V Power supply.
Low shutdown current.
Low quiescent current.
Output pin short-circuit protection and
automatic recovery.
Over-Heat Protection and automatic recovery.
Minimum external components.
No output filter required for inductive loads.
Low noise during turn-on and turn-off transitions.
Lead free and green package available.
(RoHS Compliant)
Package : 10pin 150mil MSOP
(without thermal pad) available.
The LY8209 is a high efficiency, high quality 3.3W
stereo class D audio power amplifier. It is a low
noise, filterless PWM architecture eliminates the
output filter, reducing external component count,
system cost, and simplify design.
The device is designed to meet of Multimedia
application includes mobile phones 、mini speaker
and other portable electronic devices.
The LY8209 is a single 5.5V power supply, it is
capable of driving 4Ω speaker load at a continuous
average output of 3.3W/CH with 10% THD+N.
The device also features an internal thermal
shutdown protection and output pin short-circuit
protection prevent the device from damage during
fault conditions.
The LY8209 is easily to be used in various portable
applications and products.
APPLICATION
GENERAL DESCRIPTION
Portable electronic devices.
Mobile phones.
USB audio.
Speaker docking.
Bluetooth speaker.
PIN CONFIGURATION
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5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
1
®
LY8209
3.3W/CH Stereo Class D Audio Power Amplifier
Rev. 1.2
PIN DESCRIPTION
SYMBOL
Pin No.
DESCRIPTION
MSOP10
INR
1
Input of right channel.
Shutdown
2
Shutdown control pin. (when LOW level is shutdown mode).
Vo-(R)
3
Negative(-) BTL output of right channel.
Vo+(R)
4
Positive(+) BTL output of right channel.
GND
5
Ground
Vo-(L)
6
Negative(-) BTL output of left channel.
Vo+(L)
7
Positive(+) BTL output of left channel.
VDD
8
Power supply of left and right channel.
INL
9
Input of left channel.
BYPASS
10
Bypass pin.
ORDERING INFORMATION
Ordering Code
LY8209U
Speaker
Channels
Stereo
Pin/
Package
MSOP10
Output Power
(THD+N=10%)
3.3W/4Ω @5.5V_BTL
2.8W/4Ω @5.0V_BTL
2.0W/8Ω @5.5V_BTL
1.6W/8Ω @5.0V_BTL
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5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
2
Input
Type
Output
Type
SE
BTL
®
LY8209
3.3W/CH Stereo Class D Audio Power Amplifier
Rev. 1.2
TYPICAL APPLICATION CIRCUIT
Figure 1. LY8209 Typical Application Circuit
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Operating Temperature
Input Voltage
Storage Temperature
Power Dissipation
ESD Susceptibility
Junction Temperature
Soldering Temperature (under 10 sec)
SYMBOL
VDD
TA
VI
TSTG
PD
VESD
TJMAX
TSOLDER
RATING
6.0
-40 to 85 (I grade)
-0.3V to VDD +0.3V
-65 to 150
Internally Limited
2000
150
260
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5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
3
UNIT
V
℃
V
℃
W
V
℃
℃
®
LY8209
3.3W/CH Stereo Class D Audio Power Amplifier
Rev. 1.2
ELECTRICAL CHARACTERISTICS (TA = 25℃)
SYMBOL
TEST CONDITION
VDD
VDD = 5.0V, RL=4Ω
Quiescent Current
IQ
VDD = 3.7V, RL=4Ω
VDD = 2.5V, RL=4Ω
Shutdown Current
ISD
VSHUTDOWN ≦0.8V,
Shutdown voltage input high
VSDIH
VDD = 5.0V
Shutdown voltage input low
VSDIL
VDD = 5.0V, VI=0V,
Output offset voltage
VOS
Av=11V/V
Shutdown temp.
Thermal shutdown temperature
TSD
Restore temp.
*1
Gv
VDD= 2.5V to 5.5V
Total Gain
(*1)The audio amplifier’s gain is determined by：
PARAMETER
Power supply voltage
MIN.
2.5
1.5
-
TYP.
6.5
5.5
5.0
0.1
-
-
*2
-
MAX.
5.5
0.3
UNIT
V
95
mV
150
110
[150KΩ / (5KΩ+Ri)] x4
mA
µA
V
℃
V/V
Pre-Amplifier Gain = [150KΩ / ( 5KΩ + Ri )] x 2
Total Gain = {[150KΩ / ( 5KΩ + Ri )] x 2} x 2
where Ri is the external serial resistance at the input pin.
(*2)Typical values are included for reference only and are not guaranteed or tested.
Typical values are measured at VDD = VDD(TYP.) and TA = 25℃
OPERATING CHARACTERISTICS (1) (Stereo mode) (TA = 25℃)
PARAMETER
SYMBOL
Power supply rejection ratio
PSRR
TEST CONDITION
Av=11 V/V ,Input=GND
Ri=51K, Ci=0.1μF
RL=4Ohm, VDD=5.0V
MIN.
MAX.
UNIT
-
-58
-
f=217Hz
-
-59
-
-77
-80
-
dB
84
-
dB
130
-
uVRMS
220
-
kHz
89
-
%
Cs
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TEL: 886-3-6668838
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*2
f=1KHz
LÆR
0.25W=0dB, f=1kHz,
RL = 4Ω, VDD=5.0V
RÆL
Av=11 V/V, RL = 8Ω,
Signal-to-noise ratio
SNR Input pin floating,
VDD=5.0V
1W=0dB
Av=11 V/V, RL = 8Ω,
Output voltage noise
Vn
Input pin floating,
VDD=5.0V
f = 20 Hz to 20 kHz,
Frequency
Fc
VDD=2.5V~5.5V
VDD=5.0V,f=1kHz,
Efficiency
η
RL=8Ω, Output=1.8W
(*2)Typical values are included for reference only and are not guaranteed or tested.
Typical values are measured at VDD = VDD(TYP.) and TA = 25℃
Crosstalk
(Stereo mode)
TYP.
dB
®
LY8209
3.3W/CH Stereo Class D Audio Power Amplifier
Rev. 1.2
OPERATING CHARACTERISTICS (2) (TA = 25℃)
MIN. TYP. *2
3.3
VDD=5.5V
2.8
THD+N= 10%, f = 1 kHz VDD=5.0V
RL= 4Ω
1.5
VDD=3.7V
0.6
VDD=2.5V
2.7
VDD=5.5V
THD+N= 1%, f = 1 kHz, VDD=5.0V
2.2
RL= 4Ω
1.2
VDD=3.7V
0.5
VDD=2.5V
Output Power
PO
2.0
VDD=5.5V
THD+N= 10%, f = 1 kHz VDD=5.0V
1.6
RL= 8Ω
0.9
VDD=3.7V
0.4
VDD=2.5V
1.6
VDD=5.5V
1.3
THD+N= 1%, f = 1 kHz, VDD=5.0V
RL= 8Ω
0.7
VDD=3.7V
0.3
VDD=2.5V
(*2)Typical values are included for reference only and are not guaranteed or tested.
Typical values are measured at VDD = VDD(TYP.) and TA = 25℃
PARAMETER
SYMBOL
TEST CONDITION
TYPICAL PERFORMACE CHARACTERISTICS
Figure 2.
Total Harmonic Distortion + Noise vs Output Power (RL = 4Ω, Stereo mode)
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5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
5
MAX.
-
UNIT
W
®
LY8209
Rev. 1.2
3.3W/CH Stereo Class D Audio Power Amplifier
Figure 3.
Total Harmonic Distortion + Noise vs Output Power (RL = 8Ω, Stereo mode)
Figure 4.
SNR vs. Noise Level
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
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®
LY8209
Rev. 1.2
3.3W/CH Stereo Class D Audio Power Amplifier
Figure 5.
Crosstalk
Figure 6
FCC Class-B (Vertical)
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5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
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®
LY8209
Rev. 1.2
3.3W/CH Stereo Class D Audio Power Amplifier
Figure 7
FCC Class-B (Horizontal)
Figure 8
CISPR Class-B (Vertical)
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
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®
LY8209
3.3W/CH Stereo Class D Audio Power Amplifier
Rev. 1.2
Figure 9
CISPR Class-B ( Horizontal)
SD Current vs. SD Voltage
Quiescent Current vs. Supply voltage
SHUTDOWN CURRENT vs SHUTDOWN VOLTAGE
QUIESCENT CURRENT vs SUPPLY VOLTAGE
8
10
No Load
9
3.7V
6
I(Q) - Quiescent Current - mA
I(SD) Shutdown Current - uA
2.5V
5V
4
2
0
4Ω, 2ch
8Ω, 2ch
8
7
6
5
4
3
2
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
2.5
3
3.7
4.2
VDD - Supply Voltage - V
Shutdown Voltage - V
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5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
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5
5.5
6
®
LY8209
3.3W/CH Stereo Class D Audio Power Amplifier
Rev. 1.2
Supply Current vs. Output Power (RL=4Ω)
Supply Current vs. Output Power (RL=8Ω)
SUPPLY CURRENT vs OUTPUT POWER
SUPPLY CURRENT vs OUTPUT POWER
1400
900
2.5V(D)
1200
5V(D)
3.7V(D)
700
800
600
400
5V(D)
600
S upply Current - m A
1000
Supply Current-mA
2.5V(D)
800
3.7V(D)
500
400
300
200
200
100
0
0
0
0.2
0.4
0.8
1.2
1.6
Po-Output Power-W RL=4Ω
2
0
2.4
0.2
0.6
0.8
1
1.2
1.4
1.6
1.8
Po - Output Power - W RL=8Ω
Load Resistance vs. Output Power (THD+N=10%)
Load Resistance vs. Output Power (THD+N=1%)
Output Power vs Load Resistance
Output Power vs Load Resistance
4.50
3.50
2.5V
2.5V
4.00
3.50
5V
5V
P o -O u tp u t P o w e r
4.2V
2.50
6V
2.50
6V
3.00
3.7V
3.00
3.7V
P o-O utput P ow er
0.4
5.5V
2.00
1.50
1.00
4.2V
5.5V
2.00
1.50
1.00
0.50
0.50
0.00
0.00
4Ω
8Ω
12Ω
16Ω
20Ω
Load Resistance
24Ω
28Ω
4Ω
32Ω
16Ω
20Ω
24Ω
28Ω
32Ω
Output Power vs. VDD (RL=4Ohm)
OUTPUT POWER vs. SUPPLY VOLTAGE(4Ω)
OUTPUT POWER vs. SUPPLY VOLTAGE(8Ω)
4.5
2.8
THD+N=10%
4
THD+N=1%
THD+N=10%
THD+N=1%
3.5
2
3
1.6
Po-Output Power
Po-Output Power
12Ω
Load Resistance
Output Power vs. VDD (RL=8Ohm)
2.4
8Ω
1.2
0.8
0.4
2.5
2
1.5
1
0.5
0
2.5V
3.7V
4.2V
5V
5.5V
0
2.5V
3.7V
4.2V
5V
5.5V
6V
VDD-Supply Voltage-V (RL=4Ohm, f=1KHz, Av=11 V/V)
6V
VDD-Supply Voltage-V (RL=8Ohm, f=1KHz, Av=11 V/V)
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
10
®
LY8209
3.3W/CH Stereo Class D Audio Power Amplifier
Rev. 1.2
Efficiency vs. Output Power (8Ohm) 3.7V
Efficiency vs. Output Power (8Ohm) 5.0V
Efficiency vs Output Power(W)
(RL=8Ω SPEAKER+33uH),VDD=5V
100
90
80
70
60
50
40
30
20
10
0
Efficiency(%)
Efficiency(%)
Efficiency vs Output Power(W)
(RL=8Ω SPEAKER+33uH),VDD=3.7V
100
90
80
70
60
50
40
30
20
10
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
Po-Output Power(W)
0
1
1.2 1.4 1.6 1.8
Efficiency vs. Output Power (4Ohm) 5.0V
Efficiency vs Output Power(W)
(RL=4Ω SPEAKER+33uH),VDD=3.7V
100
90
80
70
60
50
40
30
20
10
0
Efficiency(%)
Efficiency(%)
1
Po-Output Power(W)
Efficiency vs. Output Power (4Ohm) 3.7V
100
90
80
70
60
50
40
30
20
10
0
0 0.1 0.2 0.4 0.6 0.8 1 1.2 1.4 1.5 1.6
Efficiency vs Output Power(W)
RL=4Ω SPEAKER+33uH,VDD=5V
0 0.1 0.2 0.4 0.8 1 1.2 1.6
Po-Output Power(W)
Po-Output Power(W)
Dissipation vs. Output Power (8Ohm)
2 2.4 2.8
Dissipation vs. Output Power (4Ohm)
POWER DISSIPATION vs OUTPUT POWER
POWER DISSIPATION vs OUTPUT POWER
0.3
1.2
(5V)PD
0.25
(5V)PD
(3.7V)PD
P D - P ower Dis s ipation - W
PD - Power Dissipation - W
0.1 0.2 0.4 0.6 0.8
0.2
0.15
0.1
0.05
1
(3.7V)PD
0.8
0.6
0.4
0.2
0
0
0
0 0.19 0.37 0.74 1.10 1.46 1.81 2.16 2.47 2.66 2.82 3.53 4.19 4.86
0.20 0.39 0.58 0.76 0.95 1.13 1.30 1.46 1.62 1.78
Po - Output Power - W RL=4Ω SPEAKER+33uH
Po - Output Power - W (RL=8Ω SPEAKER+33uH)
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
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®
LY8209
3.3W/CH Stereo Class D Audio Power Amplifier
Rev. 1.2
APPLICATION INFORMATION
Input Resistors (Ri) and Gain
The LY8209 have two internal amplifier stages. The pre-amplifier gain is externally configurable, while the
total gain is internally fixed. The closed-loop gain of the pre-amplifier gain is set by selecting the Rf
(Rf=150KΩ) to Ri while the total gain is fixed at 4x. So the input resistors (Ri) set the gain of the amplifier
according to the equation.
Pre-Amplifier Gain = (Rf / Ri) x 2
Total Gain = [(Rf / Ri ) x 2] x 2
AVD = 20 x log [4 x (Rf /Ri )]
The resistor matching is very important in the amplifiers. Balance of the output on the reference voltage
depends on matched ratio of the resistors. CMRR, PSRR, and cancellation of the second harmonic distortion
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 LY8209 to limit noise injection on the high-impedance nodes. For optimal performance the gain
should be set to 4 V/V or lower. Lower gain allows the LY8209 to operate at its best,
For example
Table 1. Typical Total Gain and AVD Values
Rf (KΩ)
150
150
150
150
150
Ri (KΩ)
150
75
50
25
15
Pre AMP. Gain
2
4
6
12
20
Total Gain
4
8
12
24
40
AVD (db)
12.04
18.06
21.58
27.60
32.04
Input Capacitors (Ci)
The LY8209 using fully differential source, So the input coupling capacitors are required. The input capacitors
and input resistors form a high-pass filter with the corner frequency(fc), determined in the equation.
fc = 1 / ( 2πRi Ci )
The value of the input capacitor is important to consider as it directly affects the bass (low frequency)
performance of the circuit. Speakers in wireless phones cannot usually respond well to low frequencies, so
the corner frequency can be set to block low frequencies in this application. Equation is reconfigured to solve
for the input coupling capacitance.
Ci = 1 / ( 2πRi fc )
If the corner frequency is within the audio band, the capacitors should have a tolerance of ±10% or better,
because any mismatch in capacitance causes an impedance mismatch at the corner frequency and below.
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®
LY8209
3.3W/CH Stereo Class D Audio Power Amplifier
Rev. 1.2
For example
In the table 2 shows the external components. Rin in connect with Cin to create a high-pass filter.
Reference
Ri
Ci
corner frequency
Table 2. Reference Component Values
Description
Note
150KΩ
51 KΩ
1% tolerance resistors
0.22uF
0.1uF
0.22uF
0.1uF
80%/–20% non polarized
4.8Hz
10.6Hz 14.18Hz 31.2Hz
Ci = 1 / ( 2πRi fc)
Ci = 1 / ( 2π x 150KΩ x 4.8Hz)=0.221uF，One would likely choose a value of 0.22uF as this value is
commonly used.
Bypass Capacitor (Cbypass)
The Bypass Capacitor (C3 ) is the most critical capacitor. During start-up or recovery from shutdown mode,
Cbypass determines the rate at which the amplifier starts up. The Cbypass will to reduce noise caused by the
power supply coupling into the output drive signal. This noise is from the internal analog reference to the
amplifier, which appears as degraded the PSRR and THD+N values. The bypass capacitor (C3 ) with values
of 1.0μF to 10.0μF is recommended for the best THD and noise performance. Therefore, increasing the
bypass capacitor reduces clicking and popping noise from power on/off and entering and leaving shutdown.
PARAMETER
Start-up time
from shutdown
Table 3. CBYPASS Reference Component Values
SYMBOL
TEST CONDITION
MIN.
TYP.
VDD=5.0V,
Cbypass = 10.0μf
560
Ci=0.1uF,
Cbypass = 4.7μf
300
Ri=51KΩ,
Cbypass = 2.2μf
150
Av=11
Cbypass = 1.0μf
120
ZI
Cbypass = 10.0μf
460
VDD=3.7V,
Ci=0.1uF,
Cbypass = 4.7μf
250
Ri=51KΩ,
Cbypass = 2.2μf
135
Av=11
100
Cbypass = 1.0μf
MAX.
-
UNIT
ms
Shutdown Function
When the LY8209 not in use. The device will be to turn off the amplifier to reduce power consumption. When
logic low is applied to the shutdown pin, this shutdown feature will turns the amplifier off. By switching the
shutdown pin connected to GND, the device supply current draw will be minimized in idle mode. The pin
cannot be left floating due to the internal did not pull-up.
Over-Heat Protection
The LY8209 has a built-in over-heat protection circuit, it will turn off all power output when the chip
temperature over 150℃, the chip will return to normal operation automatically after the temperature cool down
to 110℃.
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5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
13
®
LY8209
Rev. 1.2
3.3W/CH Stereo Class D Audio Power Amplifier
Short-circuit Protection
The LY8209 has short circuit protection circuitry on the outputs to prevent damage when output-to-output
short occurs. When a short circuit is detected on the outputs, the outputs are disabled immediately. If the short
was removed, the device activates again.
PCB LAYOUT
All the external components must place very close to the LY8209. The input resistors need to be very close to
the LY8209 input pins so noise does not couple on the high impedance nodes between the input resistors and
the input amplifier of the LY8209. Then place the decoupling capacitor Cs, close to the LY8209 is important
for the efficiency of the class-D amplifier. Any resistance or inductance in the trace between the device and
the capacitor can cause a loss in efficiency.
If device had AVDD(Analog VDD) pin, place the decoupling capacitor 0.1uF, close to the device pin is very
important.
Making the high current traces going to VDD, GND, VO+ and VO- pins of the LY8209 should be as wide as
possible to minimize trace resistance. If these traces are too thin, the LY8209's performance and output
power will decrease. The input traces do not need to be wide, but do need to run side-by-side to enable
common-mode noise cancellation.
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
14
®
LY8209
3.3W/CH Stereo Class D Audio Power Amplifier
Rev. 1.2
DEMO BOARD INFORMATION
Demo Board Application Circuit : (Stereo Mode)
Figure 10. Demo Board Application Circuit
Demo Board BOM List :
LY8209 V1.0 BOM List (Stereo Mode)
No.
Description
1 Resistor, 47KΩ
2 Resistor, 100KΩ
3 Capacitor, 0.1uF
4
5
6
7
8
9
Capacitor, 4.7uF
Capacitor, 220.0uF
IC
1*2 Pin Header
Capacitor, 330pF(Option)
Capacitor, 390pF(Option)
Chip Bead
10
1KΩ/100MHz(Option)
Reference
R1,R2
R9
C1,C2,C4
Note
1/16W,1%
1/16W,1%
80%/−20%, non polarized
C3
C6
U2
J2,J6
C12,C13,C15,C16
C11,C14
80%/−20%, non polarized
25V,105℃,8x11,EC Cap.
LY8209U, (MSOP10)
Pitch 2.54 mm
80%/−20%, nonpolarized
80%/−20%, nonpolarized
L1,L2,L3,L4,L5,L6
1000Ω(1KΩ)±25%/100MHz
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
15
®
LY8209
3.3W/CH Stereo Class D Audio Power Amplifier
Rev. 1.2
Demo Board Artwork :
Top Silkscreen
Top Layer
Composite view
Bottom Layer
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
16
®
LY8209
Rev. 1.2
3.3W/CH Stereo Class D Audio Power Amplifier
PACKAGE OUTLINE DIMENSION
MSOP 10 Pin Package Outline Dimension
Lyontek Inc. reserves the rights to change the specifications and products without notice.
5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan
TEL: 886-3-6668838
FAX: 886-3-6668836
17