General Description
The MAX9830 mono 2W Class D amplifier provides
Class AB audio performance with Class D efficiency.
Active emissions limiting edge rate and overshoot con-
trol circuitry greatly reduces EMI. A filterless spread-
spectrum modulation scheme eliminates the need for
output filtering found in traditional Class D devices.
These features reduce application component count.
The MAX9830’s industry-leading 1.6mA at 5V, 1.2mA at
3.6V, quiescent current extends battery life in portable
applications.
The MAX9830 is available in an 8-pin TDFN (2mm x
2mm x 0.8mm) and is specified over the extended
-40°C to +85°C temperature range.
Applications
Notebook and Netbook Computers
Cellular Phones
MP3 Players
Portable Audio Players
VoIP Phones
Features
oIndustry-Leading Quiescent Current: 1.6mA at 5V,
1.2mA at 3.6V
oSpread Spectrum and Active Emissions Limiting
oPasses EMI Limit Unfiltered with Up to 24in
(61cm) of Speaker Cable
oClick-and-Pop Suppression
oThermal and Overcurrent Protection
oLow 0.5µA Current Shutdown Mode
oSpace-Saving, 2mm x 2mm x 0.8mm, 8-Pin TDFN
Package
MAX9830
Mono 2W Class D Amplifier
________________________________________________________________
Maxim Integrated Products
1
19-4806; Rev 1; 4/10
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
MAX9830
+2.6V TO +5.5V
0.1µF
PVDD
OUT+
OUT-
PGND
SHDN
IN+
IN-
N.C.
0.47µF
0.47µF
Typical Operating Circuit
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX9830AETA+ -40°C to +85°C 8 TDFN-EP*
+
Denotes a lead(Pb)-free/RoHS-compliant package.
*
EP = Exposed pad.
1
+
34
865
PVDD OUT- PGND
MAX9830
2
7
OUT+
IN+ SHDN N.C.IN-
TDFN
2mm x 2mm x 0.8mm
TOP VIEW
*EP
*EP = EXPOSED PAD. CONNECT THE EP TO
PGND TO ENHANCE THERMAL DISSIPATION.
Pin Configuration
MAX9830
Mono 2W Class D Amplifier
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VPVDD = VSHDN = 5V, VPGND = 0V, RL= ∞, unless otherwise specified. RLconnected between OUT+ and OUT-, AC measurement
bandwidth 20Hz to 22kHz, TA= TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Notes 1, 2)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Voltage
PVDD, IN+, IN-, SHDN, to PGND .........................-0.3V to +6V
OUT+, OUT- to PGND...........................-0.3V to VPVDD + 0.3V
Current
Continuous Current Into/Out of PVDD, PGND,
OUT+, OUT- ..............................................................±600mA
Continuous Input Current (all other pins) .....................±20mA
Duration of Short Circuit Between
OUT+, OUT-, and PVDD, PGND ............................Continuous
Continuous Power Dissipation for a Multilayer Board
(TA= +70°C)
8-Pin TDFN-EP (derate 11.9mW/°C) .........................953.5mW
Junction Temperature......................................................+150°C
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
Rate of Voltage Rise at PVDD .............................................1V/µs
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SPEAKER AMPLIFIER
Voltage Range PVDD Inferred from PSRR test 2.6 5.5 V
VPVDD = 5.0V 1.6 2.5
Quiescent Supply Current IDD VPVDD = 3.6V 1.2 mA
Shutdown Supply Current ISHDN VSHDN = 0V, TA = +25°C 0.5 10 µA
Turn-On Time tON 1.9 4 ms
Bias Voltage VBIAS 1.31 V
Single ended 1
Maximum AC Input Voltage VIN Differential 2 VRMS
Between inputs 85.6
Input Resistance in Shutdown RINSD From inputs to PGND 43 kΩ
Input Resistance RIN 12 20 kΩ
Voltage Gain AV12 dB
Common-Mode Rejection Ratio CMRR fIN = 1kHz, input referred 48 dB
VPVDD = 2.6V to 5.5V, TA = +25°C 54 64.3
fRIPPLE = 217Hz 72Power-Supply Rejection Ratio PSRR PVDDRIPPLE =
200mVP-P (Note 3) fRIPPLE = 20kHz 64
dB
RL = 8Ω1.5
Output Power POUT THD+N = 10%,
fIN = 1kHz RL = 4Ω2.25 W
RL = 8Ω, POUT =
0.5W 0.04
Total Harmonic Distortion Plus
Noise THD+N fIN = 1kHz
RL = 4Ω, POUT = 1W 0.04
%
Output Offset Voltage VOS TA = +25°C ±3 ±30 mV
Into shutdown -56
Click-and-Pop Level KCP
Peak voltage,
A-weighted, 32
samples/sec
(Notes 3, 4) Out of shutdown -56
dBV
MAX9830
Mono 2W Class D Amplifier
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Oscillator Frequency fOSC 600 kHz
Spread-Spectrum Bandwidth ±10 kHz
Noise VNA-weighted (Note 3) 39 µVRMS
Signal-to-Noise Ratio SNR POUT = POUT at 1% THD+N, A-weighted
RL = 8Ω98 dB
Output Current Limit ILIM TA = +25°C 3 A
Thermal Shutdown Level +180 °C
Thermal Shutdown Hysterysis 30 °C
Efficiency ηRL = 8Ω, POUT = 1.5W 85 %
DIGITAL INPUT (SHDN)
Input Voltage High VIH 1.4 V
Input Voltage Low VIL 0.4 V
Input Leakage Current TA = +25°C ±10 µA
ELECTRICAL CHARACTERISTICS (continued)
(VPVDD = VSHDN = 5V, VPGND = 0V, RL= ∞, unless otherwise specified. RLconnected between OUT+ and OUT-, AC measurement
bandwidth 20Hz to 22kHz, TA= TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Notes 1, 2)
Note 1: All devices are 100% production tested at TA= +25°C. All temperature limits are guaranteed by design.
Note 2: Testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For RL= 4Ω, L = 33µH.
For RL= 8Ω, L = 68µH.
Note 3: Amplifier inputs AC-coupled to PGND with CIN = 0.47µF.
Note 4: Specified at room temperature with an 8Ωresistive load in series with a 68µH inductive load connected across BTL outputs.
Mode transitions are controlled by SHDN.
MAX9830
Mono 2W Class D Amplifier
4 _______________________________________________________________________________________
Typical Operating Characteristics
(VPVDD = VSHDN = 5.0V, VPGND = 0V, RL= ∞, unless otherwise specified. RLconnected between OUT+ and OUT-, AC measure-
ment bandwidth 20Hz to 22kHz, TA= +25°C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX9830 toc01
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.1
1
10
0.01
10 100k
POUT = 1.4W
POUT = 400mW
VPVDD = 5.0V
RLOAD = 4I
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX9830 toc02
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.1
1
10
0.01
10 100k
POUT = 600mW
POUT = 100mW
VPVDD = 3.6V
RLOAD = 4I
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX9830 toc03
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.1
1
10
0.01
10 100k
POUT = 1W
POUT = 100mW
VPVDD = 5.0V
RLOAD = 8I
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX9830 toc04
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.1
1
10
0.01
10 100k
POUT = 500mW
POUT = 100mW
VPVDD = 3.6V
RLOAD = 8I
2.52.01.51.00.503.0
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9830 toc05
0.1
1
10
0.01
OUTPUT POWER (W)
VPVDD = 5.0V
RLOAD = 4I
THD+N (%)
f = 100Hz
f = 6kHz
f = 1kHz
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
OUTPUT POWER (W)
1.2
1.00.80.60.40.20 1.4
MAX9830 toc06
0.1
1
10
0.01
THD+N (%)
VPVDD = 3.6V
RLOAD = 4I
f = 6kHz
f = 100Hz
f = 1kHz
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9830 toc07
OUTPUT POWER (W)
THD+N (%)
1.61.41.21.00.80.60.40.2
0.1
1
10
0.01
01.8
VPVDD = 5.0V
RLOAD = 8I
f = 6kHz
f = 100Hz
f = 1kHz
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9830 toc08
OUTPUT POWER (W)
THD+N (%)
0.80.70.60.50.40.30.20.1
0.1
1
10
0.01
0 0.9
VPVDD = 3.6V
RLOAD = 8I
f = 6kHz
f = 100Hz
f = 1kHz
OUTPUT POWER vs. LOAD RESISTANCE
MAX9830 toc09
LOAD RESISTANCE (I)
OUTPUT POWER (W)
10
0.5
1.0
1.5
2.0
2.5
0
1100
THD+N = 10%
THD+N = 1%
VPVDD = 5.0V
MAX9830
Mono 2W Class D Amplifier
_______________________________________________________________________________________ 5
OUTPUT POWER vs. LOAD RESISTANCE
MAX9830 toc10
OUTPUT POWER (W)
10
0.2
0.4
0.6
0.8
1.0
1.2
0
1 100
LOAD RESISTANCE (I)
THD+N = 10%
THD+N = 1%
VPVDD = 3.6V
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX9830 toc10a
OUTPUT POWER (W)
4.0
0.4
0.2
0.6
0.8
1.0
1.4
1.2
1.6
1.8
2.0
0
2.5 5.55.04.53.53.0
SUPPLY VOLTAGE (V)
1% THD+N
10% THD+N
fIN = 1kHz
RL = 8I
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX9830 toc10b
OUTPUT POWER (W)
4.0
0.5
1.0
1.5
2.0
2.5
3.0
0
2.5 5.55.04.53.53.0
SUPPLY VOLTAGE (V)
1% THD+N
10% THD+N
fIN = 1kHz
RL = 4I
EFFICIENCY vs. OUTPUT POWER
MAX9830 toc11
OUTPUT POWER (W)
EFFICIENCY (%)
1.81.61.41.21.00.80.60.40.2
20
40
60
80
100
0
02.0
VPVDD = 5.0V RLOAD = 8I
RLOAD = 4I
EFFICIENCY vs. OUTPUT POWER
MAX9830 toc12
OUTPUT POWER (W)
EFFICIENCY (%)
0.90.80.70.60.50.40.30.20.1
20
40
60
80
100
0
0 1.0
RLOAD = 8I
RLOAD = 4I
VPVDD = 3.6V
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9830 toc13
FREQUENCY (Hz)
PSRR (dB)
10k1k100
-80
-90
-70
-50
-60
-30
-40
-10
-20
0
-100
10 100k
VRIPPLE = 200mVP-P
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
MAX9830 toc14
FREQUENCY (Hz)
CMRR (dB)
10k1k100
-50
-40
-30
-20
-10
0
-60
10 100k
INPUT REFERRED
AMPLITUDE vs. FREQUENCY
MAX9830 toc15
FREQUENCY (Hz)
AMPLITUDE (dB)
10k1k100
2
4
6
8
10
12
14
0
10 100k
STARTUP WAVEFORM
MAX9830 toc16
OUTPUT
500mA/div
SHDN
2V/div
400Fs/div
Typical Operating Characteristics (continued)
(VPVDD = VSHDN = 5.0V, VPGND = 0V, RL= ∞, unless otherwise specified. RLconnected between OUT+ and OUT-, AC measure-
ment bandwidth 20Hz to 22kHz, TA= +25°C, unless otherwise noted.)
MAX9830
Mono 2W Class D Amplifier
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VPVDD = VSHDN = 5.0V, VPGND = 0V, RL= ∞, unless otherwise specified. RLconnected between OUT+ and OUT-, AC measure-
ment bandwidth 20Hz to 22kHz, TA= +25°C, unless otherwise noted.)
SHUTDOWN WAVEFORM
MAX9830 toc17
OUTPUT
500mA/div
SHDN
2V/div
400Fs/div
WIDEBAND OUTPUT SPECTRUM
MAX9830 toc18
FREQUENCY (MHz)
OUTPUT AMPLITUDE (dBV)
10010
-100
-80
-60
-40
-20
0
-120
1 1000
RBW = 100Hz
OUTPUT FREQUENCY SPECTRUM
MAX9830 toc19
FREQUENCY (kHz)
OUTPUT MAGNITUDE (dBV)
18161412108642
-120
-100
-80
-60
-40
-20
0
-140
020
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9830 toc20
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
5.04.54.03.53.0
0.4
0.8
1.2
1.6
2.0
0
2.5 5.5
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
MAX9830 toc21
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT (FA)
5.04.54.03.53.0
0.1
0.2
0.3
0.4
0.5
0.6
0
2.5 5.5
RF IMMUNITY vs. FREQUENCY
MAX9830 toc22
FREQUENCY (MHz)
RF IMMUNITY (dBV)
25002000500 1000 1500
-70
-60
-50
-40
-30
-20
-10
0
-80
0 3000
_______________________________________________________________________________________________________ 7
Detailed Description
The MAX9830 features industry-leading quiescent cur-
rent, low-power shutdown mode, comprehensive click-
and-pop suppression, and excellent RF immunity.
The MAX9830 offers Class AB audio performance with
Class D efficiency in a minimal board-space solution.
The Class D amplifier features spread-spectrum modu-
lation combined with edge rate and overshoot control
circuitry that offers significant improvements to switch-
mode amplifier radiated emissions.
The MAX9830 includes thermal overload and short-cir-
cuit protection.
Class D Speaker Amplifier
The MAX9830 filterless Class D amplifier offers much
higher efficiency than Class AB amplifiers. The high
efficiency of a Class D amplifier is due to the switching
operation of the output stage transistors. Any power
loss associated with the Class D output stage is mostly
due to the I2R loss of the MOSFET on-resistance and
quiescent current overhead.
Ultra-Low EMI Filterless Output Stage
Traditional Class D amplifiers require the use of exter-
nal LC filters, or shielding, to meet EN55022B electro-
magnetic-interference (EMI) regulation standards.
Maxim’s active emissions limiting edge-rate control cir-
cuitry and spread-spectrum modulation reduces EMI
emissions, while maintaining up to 85% efficiency.
Maxim’s spread-spectrum modulation mode flattens
wideband spectral components, while proprietary tech-
niques ensure that the cycle-to-cycle variation of the
switching period does not degrade audio reproduction
or efficiency. The MAX9830’s spread-spectrum
modulator randomly varies the switching
frequency by ±10kHz around the center frequency
(600kHz). Above 10MHz, the wideband spectrum looks
like noise for EMI purposes (Figure 1).
Speaker Current Limit
If the output current of the speaker amplifier exceeds
the current limit (1.8A typ), the MAX9830 disables the
outputs for approximately 400µs. At the end of 400µs,
the outputs are re-enabled. If the fault condition still
exists, the MAX9830 continues to disable and re-enable
the outputs until the fault condition is removed.
Shutdown
The MAX9830 features a low-power shutdown mode,
drawing 0.5µA of supply current. Drive SHDN low to put
the MAX9830 into shutdown.
Click-and-Pop Suppression
The MAX9830 speaker amplifier features Maxim’s com-
prehensive click-and-pop suppression. During startup,
the click-and-pop suppression circuitry reduces any
audible transient sources internal to the device. When
entering shutdown, the differential speaker outputs
ramp down to PGND quickly and simultaneously.
MAX9830
Mono 2W Class D Amplifier
Pin Description
PIN NAME FUNCTION
1 IN+ Noninverting Audio Input
2 IN- Inverting Audio Input
3SHDN Active-Low Shutdown Input. Drive SHDN low to place the device in shutdown mode.
4 N.C. No Connection. Leave unconnected.
5 PGND Ground
6 OUT- Negative Speaker Output
7 OUT+ Positive Speaker Output
8 PVDD Power Supply. Bypass PVDD to PGND with a 0.1µF capacitor.
— EP Exposed Pad. Connect exposed pad to a solid ground plane.
FREQUENCY (MHz)
AMPLITUDE (dBµV/m)
40
30
20
10
0
-10
30 60 100 140 180 220 260 30080 120 160 200 240 280
EN55022B LIMIT
Figure 1. EMI with 24in of Speaker Cable
MAX9830
Applications Information
Filterless Class D Operation
Traditional Class D amplifiers require an output filter.
The filter adds cost, size, and decreases efficiency and
THD+N performance. The MAX9830’s filterless modula-
tion scheme does not require an output filter.
Because the switching frequency of the MAX9830 is
well beyond the bandwidth of most speakers, voice coil
movement at the switching frequency is very small. Use
a speaker with a series inductance > 10µH. Typical 8Ω
speakers exhibit series inductances in the 20µH to
100µH range.
Component Selection
Optional Ferrite Bead Filter
Although not normally needed, in applications where
speaker leads exceed 24in at VPVDD = 3V, use a filter
constructed from an inexpensive ferrite bead and a
small-value capacitor to ground (Figure 2) to provide
additional EMI suppression. Use a ferrite bead with low
DC resistance, high frequency (≥1MHz) impedance of
100Ωto 600Ω, and rated for at least 1A. The capacitor
value varies based on the ferrite bead chosen and the
actual speaker lead length. Select the capacitor value
based on EMI performance.
Speaker Amplifier Power Supply Input (PVDD)
PVDD powers the speaker amplifier. PVDD ranges from
2.6V to 5.5V. Bypass PVDD with a 0.1µF capacitor to
PGND. Apply additional bulk capacitance at the device
if long input traces between PVDD and the power
source are used. Ensure a rate of voltage rise at PVDD
is limited to 1V/µs.
Input Filtering
The input-coupling capacitor (CIN), in conjunction with
the amplifier’s internal input resistance (RIN), forms a
highpass filter that removes the DC bias from the
incoming signal. These capacitors allow the amplifier to
bias the signal to an optimum DC level. Select 0.47µF
capacitors for optimum click-and-pop performance and
17Hz f-3dB.
If a different f-3dB is required, CIN, assuming zero-
source-impedance, is:
Use capacitors with adequately low voltage-coefficient
for best low-frequency THD performance.
Layout and Grounding
Proper layout and grounding are essential for optimum
performance. Good grounding improves audio perfor-
mance and prevents switching noise from coupling into
the audio signal.
Use wide, low-resistance output traces. As load imped-
ance decreases, the current drawn from the device out-
puts increase. At higher current, the resistance of the
output traces decrease the power delivered to the load.
For example, if 2W is delivered from the speaker output
to a 4Ωload through a 100mΩtrace, 49mW is con-
sumed in the trace. If power is delivered through a
10mΩtrace, only 5mW is consumed in the trace. Wide
output, supply and ground traces also improve the
power dissipation of the device.
The MAX9830 is inherently designed for excellent RF
immunity. For best performance, add ground fills
around all signal traces on top and bottom PCB planes.
The MAX9830 TDFN package features an exposed
thermal pad on its underside. This pad lowers the pack-
age’s thermal resistance by providing a heat conduc-
tion path from the die to the PCB. Connect the exposed
thermal pad to the ground plane by using a large pad
and multiple vias.
Chip Information
PROCESS: CMOS
CfµF
IN dB
=8
3
[]
-
Mono 2W Class D Amplifier
8 _______________________________________________________________________________________
MAX9830
OUT+
OUT-
Figure 2. Optional Ferrite Bead Filter
MAX9830
Mono 2W Class D Amplifier
_______________________________________________________________________________________ 9
UVLO/POWER
MANAGEMENT
CLICK-AND-POP
SUPPRESSION
LOW-EMI
DRIVER
FERRITE
BEAD
LOW-EMI
DRIVER
CLASS D
MODULATOR PVDD
PVDD
PGND
PGND
PGND
5
8
0.47µF
1
2
7
6
PVDD
3
SHDN
10µF*
OUT+
OUT-
IN+
IN-
*BULK CAPACITOR
MAX9830
0.47µF
2.6V TO 5.5V
0.1µF
Functional Diagram
MAX9830
Mono 2W Class D Amplifier
10 ______________________________________________________________________________________
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
8 TDFN-EP T822+2 21-0168
8L TDFN EXPOSED PADS.EPS
PACKAGE OUTLINE
21-0168
2
1
E
8L TDFN EXPOSED PAD, 2x2x0.80mm
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the
package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the
package regardless of RoHS status.
MAX9830
Mono 2W Class D Amplifier
______________________________________________________________________________________ 11
SYMBOL
COMMON DIMENSIONS
2.101.90
0.80
MAX.
0.70
MIN.
0.20 REF.
0.40
0.05
2.10
0.20
0.00
1.90
D
A
L
A1
E
A2
k
[(N/2)-1] x ebe
PACKAGE VARIATIONS
PKG. CODE E2D2N
0.25 MIN.
PACKAGE OUTLINE
21-0168
2
2
E
8L TDFN EXPOSED PAD, 2x2x0.80mm
1.30±0.10 1.50 REF0.25±0.050.50 TYP. 0.70±0.108T822-1
r
0.125
1.20±0.10 1.50 REF0.25±0.050.50 TYP. 0.80±0.108T822-2 0.125
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the
package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the
package regardless of RoHS status.
MAX9830
Mono 2W Class D Amplifier
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12
____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 8/09 Initial release —
1 4/10 Removed PSRR spec from the Features section, updated EC table specs, and
added new TOCs 1, 2, 5
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Authorized Distributor
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