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MAX98302ETD+T
Stereo 2.4W Class D Amplifier
Stereo 2.4W Class D Amplifier
General Description
The MAX98302 stereo 2.4W Class D amplifier provides
Class AB audio performance with Class D efficiency.
This device offers five selectable gain settings (6dB,
9dB, 12dB, 15dB, and 18dB) set by a single gain-select
input (GAIN).
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 MAX98302 industry-leading 1.65mA at 3.7V, 2.25mA
at 5V, quiescent current extends battery life in portable
applications.
The MAX98302 is available in a 14-pin TDFN-EP (3mm x
3mm x 0.75mm) package specified over the extended
-40NC to +85NC temperature range.
Applications
FeaturesIndustry-Leading Quiescent Current: 1.65mA at
3.7V, 2.25mA at 5VSpread Spectrum and Active Emissions Limiting
S Five Selectable Gains
S High -67dB PSRR at 217Hz
S Click-and-Pop Suppression
S Thermal and Overcurrent Protection
S Low-Current Shutdown Mode
S Space-Saving, 3mm x 3mm x 0.75mm, 14-Pin
TDFN-EP Package
19-5169; Rev 0; 4/10
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Ordering Information
Typical Application Circuit
Notebook and Netbook
Computers
Cellular Phones
MP3 Players
Portable Audio Players
VoIP Phones
EVALUATION KIT
AVAILABLE
INL+OUTL+
OUTL-
OUTR-
OUTR+
INL-
INR-
INR+
GAINGAIN
CONTROL
1µF
1µF
1µF
1µF
PVDD
PVDD
PGNDSHDN
MAX98302
0.1µF10µF
+2.6V TO +5.5V
PVDD
PARTTEMP RANGEPIN-PACKAGE
MAX98302ETD+-40NC to +85NC14 TDFN-EP*
MAX98302
Stereo 2.4W Class D Amplifier
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.
PVDD to PGND ..........................................................-0.3V to 6V
All Other Pins to PGND ..........................-0.3V to (PVDD + 0.3V)
Continuous Current into PVDD, PGND,
OUTL_, OUTR_ ..........................................................Q600mA
Continuous Input Current (all other pins) ........................Q20mA
Duration of Short Circuit Between OUTL_,
OUTR_ to PVDD or PGND .....................................Continuous
Duration of Short Circuit Between OUTL+ to OUTL-,
OUTR+ to OUTR- ..................................................Continuous
Continuous Power Dissipation for Single Layer Board (TA = +70NC)
14-Pin TDFN (derate 18.5mW/NC above +70NC) ....1481.5mW
14-Pin TDFN BJA (Note 1) ............................................54NC/W
14-Pin TDFN BJC (Note 1) ..............................................8NC/W
Continuous Power Dissipation for Multilayer Board (TA = +70NC)
14-Pin TDFN (derate 24.4mW/NC above +70NC) ....1951.2mW
14-Pin TDFN BJA (Note 1) ............................................41NC/W
14-Pin TDFN BJC (Note 1) ..............................................8NC/W
Junction Temperature .....................................................+150NC
Operating Temperature Range ..........................-40NC to +85NC
Storage Temperature Range ............................-65NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
ELECTRICAL CHARACTERISTICS
(VPVDD = VSHDN = 5.0V, VPGND = 0V, AV = 12dB (GAIN = PVDD), RL = J, RL connected between OUT_+ to OUT_-, 20Hz to 22kHz
AC measurement bandwidth, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25NC.) (Notes 2, 3)
ABSOLUTE MAXIMUM RATINGS
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to /thermal-tutorial.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
AMPLIFIER CHARACTERISTICS
Supply Voltage RangeVPVDDInferred from PSRR test2.65.5V
Undervoltage LockoutUVLO2.5V
Quiescent Supply CurrentIDDVPVDD = 5.0V, TA = +25NC2.253.4mAVPVDD = 3.7V1.65
Shutdown Supply CurrentISHDNVSHDN = 0V, TA = +25NC0.110FA
Turn-On TimetON3.710ms
Bias VoltageVBIAS1.3V
Voltage GainAV
Connect GAIN to PGND17.51818.5
Connect GAIN to PGND through 100kI ±5%
resistor14.51515.5
Connect GAIN to PVDD11.51212.5
Connect GAIN to PVDD through 100kI ±5%
resistor8.599.5
GAIN unconnected 5.566.5
Input ResistanceRIN
AV = 18dB 1420
AV = 15dB1420
AV = 12dB1420
AV = 9dB1928
AV = 6dB2640
Output Offset VoltageVOSTA = +25NC (Note 4)±4±20mV
MAX98302
Stereo 2.4W Class D Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(VPVDD = VSHDN = 5.0V, VPGND = 0V, AV = 12dB (GAIN = PVDD), RL = J, RL connected between OUT_+ to OUT_-, 20Hz to 22kHz
AC measurement bandwidth, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25NC.) (Notes 2, 3)
Note 2: All devices are 100% production tested at TA = +25NC. All temperature limits are guaranteed by design.
Note 3: Testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For RL = 4I,
L = 33FH. For RL = 8I, L = 68FH.
Note 4: Amplifier inputs AC-coupled to ground.
Note 5: Mode transitions controlled by SHDN.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Click and PopKCP
Peak voltage, A-weighted,
32/samples per second,
RL = 8I + 68FH
(Notes 4, 5)
Into shutdown-54
dBV
Out of shutdown-54
Common-Mode Rejection RatioCMRRfIN = 1kHz, input referred62dB
CrosstalkPOUT = 300mW,
RL = 8I + 68FH
f = 1kHz92dBf = 10kHz80
Power-Supply Rejection Ratio
(Note 4)PSRR
VPVDD = 2.6V to 5.5V, TA = +25NC5067VRIPPLE = 200mVP-P,
RL = 8I + 68FH
f = 217Hz67
f = 1kHz65
f = 10kHz58
Output PowerPOUT
THD+N = 10%,
fIN = 1kHz
RL = 4I + 33FH2.4RL = 8I + 68FH1.6
RL = 8I + 68FH,
VPVDD = 3.7V0.87
THD+N = 1%,
fIN = 1kHz
RL = 4I + 33FH2RL = 8I +68FH1.25
RL = 8I + 68FH,
VPVDD = 3.7V0.68
Total Harmonic Distortion Plus
NoiseTHD+NfIN = 1kHz
RL = 4I + 33FH,
VPVDD = 1W0.04RL = 8I + 68FH
POUT = 0.5W0.04
Oscillator FrequencyfOSC300kHz
Spread-Spectrum Bandwidth±7kHz
EfficiencyETHD+N = 1%, f = 1kHz, RL = 8I + 68FH83%
Output NoiseVNAV = 6dB, A weighted (Note 4)50FVRMS
Output Current LimitILIM2A
Thermal Shutdown Level160NC
Thermal Shutdown Hysteresis30NC
DIGITAL INPUT (SHDN GAIN)
Input Voltage HighVINH1.4V
Input Voltage LowVINL0.4V
Input Leakage CurrentTA = +25NC±1FA
MAX98302
Stereo 2.4W Class D Amplifier
Typical Operating Characteristics
(VPVDD = VSHDN = 5.0V, VPGND = 0V, AV = 12dB, RL = J, unless otherwise specified, RL connected between OUT_+ to OUT_-, 20Hz
to 22kHz AC measurement bandwidth, TA = +25NC, unless otherwise noted.)
THD+N vs. FREQUENCY
MAX98302 toc01
FREQUENCY (kHz)
THD+N (%)10.1
RL = 4I + 33µH
VPVDD = 5.0V
POUT = 500mW
POUT = 400mW
THD+N vs. FREQUENCY
MAX98302 toc02
FREQUENCY (kHz)
THD+N (%)10.1
RL = 4I + 33µH
VPVDD = 3.7V
POUT = 500mW
POUT = 400mW
THD+N vs. FREQUENCY
MAX98302 toc03
FREQUENCY (kHz)
THD+N (%)10.1
RL = 8I + 68µH
VPVDD = 5.0V
POUT = 600mW
POUT = 800mW
THD+N vs. FREQUENCY
MAX98302 toc04
FREQUENCY (kHz)
THD+N (%)10.1
RL = 8I + 68µH
VPVDD = 3.7V
POUT = 100mW
POUT = 350mW
THD+N vs. OUTPUT POWER
MAX98302 toc05
OUTPUT POWER (W)
THD+N (%)
RL = 4I + 33µH
VPVDD = 5.0V
fIN = 6kHz
fIN = 1kHz
fIN = 100Hz
THD+N vs. OUTPUT POWER
MAX98302 toc06
OUTPUT POWER (W)
THD+N (%)
RL = 4I + 33µH
VPVDD = 3.7V
fIN = 6kHz
fIN = 1kHz
fIN = 100Hz
THD+N vs. OUTPUT POWER
MAX98302 toc07
THD+N (%)
RL = 8I + 68µH
VPVDD = 5.0V
fIN = 6kHz
fIN = 1kHz
fIN = 100Hz
THD+N vs. OUTPUT POWER
MAX98302 toc08
THD+N (%)
RL = 8I + 68µH
VPVDD = 3.7V
fIN = 6kHz
fIN = 1kHz
fIN = 100Hz
EFFICIENCY vs. OUTPUT POWER
MAX98302 toc09
OUTPUT POWER PER CHANNEL (W)
EFFICIENCY (%)
VPVDD = 5.0V
RL = 8I + 68µH
RL = 4I + 33µH
MAX98302
Stereo 2.4W Class D Amplifier
Typical Operating Characteristics (continued)
(VPVDD = VSHDN = 5.0V, VPGND = 0V, AV = 12dB, RL = J, unless otherwise specified, RL connected between OUT_+ to OUT_-, 20Hz
to 22kHz AC measurement bandwidth, TA = +25NC, unless otherwise noted.)
EFFICIENCY vs. OUTPUT POWER
MAX98302 toc10
OUTPUT POWER (W)
EFFICIENCY (%)
VPVDD = 3.7V
RL = 8I + 68µH
RL = 4I + 33µH
OUTPUT POWER vs. LOAD RESISTANCE
MAX98302 toc11
LOAD RESISTANCE (I)
OUTPUT POWER PER CHANNEL (W)
VPVDD = 5V
10% THD+N
1% THD+N
OUTPUT POWER vs. LOAD RESISTANCE
MAX98302 toc12
LOAD RESISTANCE (I)
OUTPUT POWER (W)
VPVDD = 3.7V
1% THD+N
10% THD+N
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX98302 toc13
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
RL = 4I + 68µH
1% THD+N
10% THD+N
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX98302 toc14
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
RL = 8I + 68µH
1% THD+N
10% THD+N
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX98302 toc15
FREQUENCY (kHz)
PSRR (dB)10.1
VRIPPLE = 200mVP-P
VPVDD = 5.0V
CROSSTALK vs. FREQUENCY
MAX98302 toc16
CROSSTALK (dB)10.1
INPUT REFERRED
RL = 8I + 68µH
POUT = 300mW
LEFT TO RIGHT
RIGHT TO LEFT
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
MAX98302 toc17
CMRR (dB)10.1
INPUT REFERRED
RL = 8I + 68µH
POUT = 300mW
GAIN vs. FREQUENCY
MAX98302 toc18
AMPLITUDE (dB)10.1
AV = 18dB
AV = 15dB
AV = 9dB
AV = 12dB
AV = 6dB
MAX98302
Stereo 2.4W Class D Amplifier
Typical Operating Characteristics (continued)
(VPVDD = VSHDN = 5.0V, VPGND = 0V, AV = 12dB, RL = J, unless otherwise specified, RL connected between OUT_+ to OUT_-, 20Hz
to 22kHz AC measurement bandwidth, TA = +25NC, unless otherwise noted.)
MAX98302 toc19
MAX98302
OUTPUT
SHDN
1ms/div
EXITING SHUTDOWN
MAX98302 toc20
MAX98302
OUTPUT
SHDN
1ms/div
ENTERING SHUTDOWN10.10.010.001100
WIDEBAND OUTPUT SPECTRUM
MAX98302 toc21
FREQUENCY (MHz)
OUTPUT MAGNITUDE (dBV)
RBW = 100Hz
RL = 8I + 68µH
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX98302 toc24
SUPPLY CURRENT (
RL = ∞
INBAND OUTPUT SPECTRUM
MAX98302 toc22
FREQUENCY (Hz)
OUTPUT MAGNITUDE (dBV)
10,0001000100
-140100,000
f = 1kHz
RL = 8I + 68µH
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX98302 toc23
SUPPLY CURRENT (mA)
RL = ∞
MAX98302
Stereo 2.4W Class D Amplifier
Pin Description
Pin Configuration
PINNAMEFUNCTION
1, 8, 14PGNDGroundINL+Noninverting Audio Left InputINL-Inverting Audio Left InputGAINGain Selection. See Table 1 for GAIN settings.INR-Inverting Audio Right InputINR+Noninverting Audio Right InputSHDNActive-Low Shutdown Input. Drive SHDN low to place the device in shutdown.OUTR+Positive Right Speaker OutputOUTR-Negative Right Speaker OutputPVDDPower Supply. Bypass PVDD to PGND with a 0.1FF capacitor.OUTL-Negative Left Speaker OutputOUTL+Positive Left Speaker OutpoutEPExposed Pad. Connect EP to a solid ground plane.
MAX98302
TDFN
TOP VIEW
*CONNECT THE EP TO PGND TO ENHANCE THERMAL DISSIPATION.51110
OUTL+PVDDOUTR-
INL+
GAIN
INR-
EP*
PGND
PGND
OUTL-
INL-
OUTR+
INR+
PGND
SHDN
