MAX9741ETN+D Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX9741ETN+D
12W+12W, Low-EMI, Spread-Spectrum, Stereo, Class D Amplifier
General Description
The MAX9741 stereo Class D audio power amplifier
provides Class AB amplifier performance with Class D
efficiency, conserving board space and eliminating the
need for a bulky heatsink. Using a high-efficiency Class
D architecture, it delivers 12W continuous output power
into 8Ωloads. Proprietary modulation and switching
schemes render the traditional Class D EMI suppression
output filter unnecessary.
The MAX9741 offers two modulation schemes: a fixed-fre-
quency mode (FFM), and a spread-spectrum mode (SSM)
that reduces EMI-radiated emissions. The device utilizes a
fully differential architecture, a full bridged output, and
offers comprehensive click-and-pop suppression.
The MAX9741 features high 80dB PSRR, low 0.1%
THD+N, and SNR in excess of 100dB. Short-circuit and
thermal-overload protection prevent the device from
being damaged during a fault condition. The MAX9741
is available in a 56-pin TQFN (8mm x 8mm x 0.8mm)
package. The MAX9741 is specified over the extended
-40°C to +85°C temperature range.
Applications
FeaturesLow-EMI Class D AmplifierSpread-Spectrum Mode Reduces EMIPasses FCC EMI Limits with Ferrite Bead Filters
with 0.5m Cables12W+12W Continuous Output Power into 8ΩLow 0.1% THD+NHigh PSRR (80dB at 1kHz)10V to 25V Single-Supply OperationDifferential Inputs Minimize Common-Mode NoisePin-Selectable Gain Reduces Component CountIndustry-Leading Click-and-Pop SuppressionShort-Circuit and Thermal-Overload ProtectionAvailable in Thermally Efficient, Space-Saving
56-Pin TQFN (8mm x 8mm x 0.8mm) Package
MAX9741
12W+12W, Low-EMI, Spread-Spectrum,
Stereo, Class D Amplifier
19-3887; Rev 0; 2/06
EVALUATION KITAVAILABLE
Ordering Information
PARTTEMP RANGEPIN-PACKAGEPKG
CODE
MAX9741ETN+-40°C to +85°C56 TQFN-EP*T5688-3
+Denotes lead-free package.
*EP = Exposed paddle.
LCD/PDP TVs
CRT TVs
PC Speakers
Pin Configuration appears at end of data sheet.
CLASS D
AMPLIFIERS
DRIVE 2 X 12W
INTO 8Ω LOADS
GAIN
CONTROL
INR+
DIFFERENTIAL AUDIO
INPUTS ELIMINATE
NOISE PICKUP
PROGRAMMABLE
SWITCHING
FREQUENCY
INR-
INL+
INL-
FS1, FS2
CLASS D
MODULATOR
OUTPUT
PROTECTION
MAX9741
Simplified Block Diagram
MAX9741
12W+12W, Low-EMI, Spread-Spectrum,
Stereo, Class D Amplifier
ABSOLUTE MAXIMUM RATINGS
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.
(All voltages referenced to GND.)
VDDto PGND, AGND.............................................................30V
OUTR_, OUTL_, C1N..................................-0.3V to (VDD+ 0.3V)
C1P............................................(VDD- 0.3V) to (CHOLD + 0.3V)
CHOLD........................................................(VDD- 0.3V) to +40V
SHDN, FS_, G_...........................................................-6.3V to 8V
All Other Pins to GND.............................................-0.3V to +12V
Duration of OUTR_/OUTL_
Short Circuit to GND, VDD......................................Continuous
Continuous Input Current (VDD, PGND)..................................2A
Continuous Input Current (all other pins)..........................±20mA
Thermal Limits (Note 1)
Continuous Power Dissipation (TA= +70°C)
Single-Layer PC Board
56-Pin TQFN (derate 28.6mW/°C above +70°C)............2.29W
θJA................................................................................35°C/W
θJC...............................................................................0.6°C/W
Continuous Power Dissipation (TA= +70°C)
Multiple-Layer PC Board
56-Pin TQFN (derate 47.6mW/°C above +70°C)............3.81W
θJA................................................................................21°C/W
θJC...............................................................................0.6°C/W
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
ELECTRICAL CHARACTERISTICS
(VDD= 18V, GND = PGND = 0V, SHDN≥VIH, AV= 16dB, CSS= CIN= 0.47µF, CREG= 0.01µF, C1 = 100nF, C2 = 1µF, FS1 = FS2 =
GND (fS= 670kHz), RLconnected between OUTL+ and OUTL- and OUTR+ and OUTR-, TA= TMINto TMAX, unless otherwise noted.
Typical values are at TA= +25°C.) (Notes 1, 2)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
GENERAL
Supply Voltage RangeVDDInferred from PSRR test1025V
Quiescent CurrentIDDRL = Open2637mA
Shutdown CurrentISHDN0.21.5µA
CSS = 470nF100Turn-On TimetONCSS = 180nF50ms
Amplifier Output Resistance in
ShutdownSHDN = GND150320kΩ
AV = 13dB355380
AV = 16dB304565
AV = 19.1dB233655Input ImpedanceRIN
AV = 29.6dB1014.322
G1 = L, G2 = L29.429.629.8
G1 = L, G2 = H18.919.119.3
G1 = H, G2 = L12.81313.2
Voltage GainAV
G1 = H, G2 = H15.91616.3
Gain MatchingBetween channels0.5%
Output Offset VoltageVOS±5±30mV
Common-Mode Rejection RatioCMRRfIN = 1kHz, input referred60dB
VDD = 10V to 25V4883
fRIPPLE = 1kHz80Power-Supply Rejection Ratio
(Note 3)PSRR200mVP-P ripplefRIPPLE = 20kHz60
Note 1:Thermal performance of this device is highly dependant on PC board layout. See the Applications Informationfor more
detail.
MAX9741
12W+12W, Low-EMI, Spread-Spectrum,
Stereo, Class D Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(VDD= 18V, GND = PGND = 0V, SHDN≥VIH, AV= 16dB, CSS= CIN= 0.47µF, CREG= 0.01µF, C1 = 100nF, C2 = 1µF, FS1 = FS2 =
GND (fS= 670kHz), RLconnected between OUTL+ and OUTL- and OUTR+ and OUTR-, TA= TMINto TMAX, unless otherwise noted.
Typical values are at TA= +25°C.) (Notes 1, 2)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
RL = 8Ω12VDD = 18V, THD+N =
10%, f = 1kHzRL = 4Ω6.5
RL = 8Ω11VDD = 24V, THD+N =
10%, f = 1kHzRL = 4Ω5
RL = 8Ω8
Continuous Output Power
(Notes 4, 5)PCONT
VDD = 12V, THD+N =
10%, f = 1kHzRL = 4Ω8.5
Total Harmonic Distortion Plus
NoiseTHD+NfIN = 1kHz, either FFM or SSM, RL = 8Ω,
POUT = 4W0.1%
FFM95.8UnweightedSSM91.8
FFM99.1Signal-to-Noise RatioSNR
RL = 8Ω,
POUT = 4W,
f = 1kHz
BW = 22Hz to 22kHzA-weightedSSM95.7
CrosstalkLeft to right, right to left, 8Ω load, fIN = 10kHz65dB
FS1 = L, FS2 = L560670800
FS1 = L, FS2 = H930
FS1 = H, FS2 = L470Oscillator FrequencyfOSC
FS1 = H, FS2 = H (spread-spectrum mode)670
±7%
kHz
VDD = 12V, RL = 8Ω, POUT = 8W78
Efficiency (Note 4)η
VDD = 18V, RL = 8Ω, POUT = 10W78
Regulator OutputVREG6V
DIGITAL INPUTS (SHDN, FS_, G_)
VIH2.5Input ThresholdsVIL0.8V
Input Leakage Current±1µA
Note 2:All devices are 100% production tested at +25°C. All temperature limits are guaranteed by design.
Note 3:PSRR is specified with the amplifier inputs connected to GND through CIN.
Note 4:Testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For RL= 8Ω, L = 68µH.
For RL= 12Ω, L = 100µH. For RL= 16Ω, L = 120µH.
Note 5:Output power measured at TA= +25°C, with a soak time of 15 minutes.
MAX9741
12W+12W, Low-EMI, Spread-Spectrum,
Stereo, Class D Amplifier
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9741 toc01
OUTPUT POWER (W)
THD+N (%)105
RL = 8Ω
VDD = 24V
VDD = 18VVDD = 12V
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9741 toc02
OUTPUT POWER (W)
THD+N (%)
RL = 4Ω
VDD = 24VVDD = 18V
VDD = 12V5
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9741 toc03
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01100k
POUT = 500mW
POUT = 8W
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX974 toc04
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01100k
POUT = 8W
SSM
FFM
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX9741 toc07
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)1613192225
RL = 8Ω
RL = 16Ω
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9741 toc05
OUTPUT POWER (W)
THD+N (%)105
f = 100Hz
f = 10kHz
f = 1kHz
EFFICIENCY vs. OUTPUT POWER
MAX9741 toc06
OUTPUT POWER (W)
EFFICIENCY (%)1248
RL = 8Ω
VDD = 18V
VDD = 12V
VDD = 24V
OUTPUT POWER vs. LOAD RESISTANCE
MAX9741 toc08
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)100
THD+N = 10%
THD+N = 1%
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
MAX9741 toc09
FREQUENCY (Hz)
CMRR (dB)
10k1k100
-80100k
Typical Operating Characteristics
(VDD= 18V, RL= 8Ω, fIN= 1kHz, 33µH with 4Ω, 68µH with 8Ω, part in SSM mode, 136µH with 16Ω, measurement BW = 22Hz to
22kHz, unless otherwise noted.)
MAX9741
12W+12W, Low-EMI, Spread-Spectrum,
Stereo, Class D Amplifier
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9741 toc10
FREQUENCY (Hz)
PSRR (dB)
10k1k100
-120100k
200mVP-P INPUT
CROSSTALK vs. FREQUENCY
MAX9741 toc11
FREQUENCY (Hz)
CROSSTALK (dB)
10k1k100
-120100k
LEFT TO RIGHT
RIGHT TO LEFT
OUTPUT FREQUENCY SPECTRUM
MAX9741 toc12
FREQUENCY (kHz)
OUTPUT MAGNITUDE (dB)
FFM MODE
UNWEIGHTED
fIN = 1kHz
POUT = 5W
OUTPUT FREQUENCY SPECTRUM
MAX941 toc13
FREQUENCY (kHz)
OUTPUT MAGNITUDE (dB)
SSM MODE
UNWEIGHTED
fIN = 1kHz
POUT = 5W
OUTPUT FREQUENCY SPECTRUM
MAX9741 toc14
FREQUENCY (kHz)
OUTPUT MAGNITUDE (dB)
SSM MODE
A-WEIGHTED
fIN = 1kHz
POUT = 5W
100k1M10M100M
WIDEBAND OUTPUT SPECTRUM
(FFM MODE)
MAX9741 toc15
FREQUENCY (Hz)
OUTPUT AMPLITUDE (dBV)
RBW = 10kHz
Typical Operating Characteristics (continued)
(VDD= 18V, RL= 8Ω, fIN= 1kHz, 33µH with 4Ω, 68µH with 8Ω, part in SSM mode, 136µH with 16Ω, measurement BW = 22Hz to
22kHz, unless otherwise noted.)

Partno	Mfg	Dc	Qty	Available	Descript
MAX9741ETN+D	MAXIM	N/a	72	avai	12W+12W, Low-EMI, Spread-Spectrum, Stereo, Class D Amplifier