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MAX98306ETD+T
Stereo 3.7W Class D Amplifier
Stereo 3.7W Class D Amplifier
General Description
The MAX98306 stereo 3.7W 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 combined with a filterless spread-spectrum
modulation scheme (SSM) provide excellent EMI perfor-
mance while eliminating the need for output filtering found
in traditional Class D devices. These features reduce
application component count.
The IC's 2.0mA quiescent current with a 3.7V supply
extends battery life in portable applications.
The IC is available in a 14-pin TDFN (3mm x 3mm x
0.75mm) package specified over the extended -40NC to
+85NC temperature range.
Applications
FeaturesOutput Power 3.7W at 3I, 10% THD, 1.7W at 8I,
10% THD, with 5V Supply Passes EMI Limit Unfiltered with Up to 12in of
Speaker CableHigh 83dB PSRR at 217Hz Spread-Spectrum Modulation and Active
Emissions Limiting
S Five Pin-Selectable Gains
S Excellent 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
19-5919; Rev 1; 8/11
+Denotes a lead(Pb)-free/RoHS-compliant package.
Ordering Information
Typical Application Circuit
Smartphones
Tablets
Cellular Phones
Accessory Speakers
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
MAX98306
0.1µF10µF
+2.6V TO +5.5V
PVDD
PARTTEMP RANGEPIN-
PACKAGE
TOP
MARK
MAX98306ETD+-40NC to +85NC14 TDFN+AEV
MAX98306
Stereo 3.7W 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.
Voltage
PVDD to PGND ....................................................-0.3V to +6V
OUTL+, OUTR+, OUTL-, OUTR-
to PGND ...........................................-0.3V to (VPVDD + 0.3V)
All Other Pins to PGND .......................................-0.3V to +6V
Current
Continuous Current Into/Out of PVDD, PGND,
OUTL+, OUTR+, OUTL-, OUTR- ..............................±800mA
Continuous Input Current (all other pins) ....................±20mA
Duration of Short Circuit
OUTL+, OUTR+, OUTL-, OUTR- to PGND or PVDD ....Continuous
OUTL+ to OUTL- or OUTR+ to OUTR- ...................Continuous
Continuous Power Dissipation for a MultiLayer Board (TA = +70°C)
TDFN (deration 24.4mW/°C above +70°C) ...............1951.2mW
Junction Temperature ....................................................+150°C
Operating Temperature Range .........................-40°C to +85°C
Storage Temperature Range ..........................-65°C to +150°C
Lead Temperature (10s, soldering) ...............................+300°C
Soldering Temperature (reflow) ......................................+260°C
ELECTRICAL CHARACTERISTICS
(VPVDD = VSHDN = 3.7V, 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.) (Note 2)
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.
Junction-to-Ambient Thermal Resistance (qJA) ..............41°C/W
Junction-to-Case Thermal Resistance (qJA) .....................8°C/W
PACKAGE THERMAL CHARACTERISTICS (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
GENERAL
Supply Voltage RangeVPVDDGuaranteed by PSRR test2.65.5V
Undervoltage LockoutUVLO1.82.3V
Quiescent Supply CurrentIPVDDVPVDD = 3.7V22.7mAVPVDD = 5.0V2.6
Shutdown Supply CurrentISHDNVSHDN = 0, TA = +25NC< 110FA
Turn On TimetON3.210ms
Bias VoltageVBIAS1.62VPVDD/22.15V
Voltage GainAV
GAIN = PGND17.51818.5
GAIN = 100kI to PGND14.51515.5
GAIN = PVDD11.51212.5
GAIN = 100kI to PVDD8.599.5
GAIN = unconnected5.566.5
Channel-to-Channel Gain
Tracking0.1%
Input ResistanceRIN
AV = 18dB (GAIN = PGND)2233
AV = 15Db (GAIN = 100kI to PGND)3146
AV = 12dB (GAIN = PVDD)4465
AV = 9dB (GAIN = 100kI to PVDD)6293
AV = 6dB (GAIN = unconnected)89131
Common-Mode Rejection RatioCMRRfIN = 1kHz, input referred79dB
MAX98306
Stereo 3.7W Class D Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(VPVDD = VSHDN = 3.7V, 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.) (Note 2)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Click-and-Pop LevelKCP
Peak voltage, TA = +25NC
A-weighted, 32 samples
per second (Notes 3, 4)
Into shutdown-79
dBVOut of shutdown-73
Power-Supply Rejection RatioPSRRTA = +25NC
(Note 3)
VPVDD = 2.6V to 5.5V,
TA = +25NC7095
f = 217Hz, 200mVP-P
ripple83
f = 1kHz, 200mVP-P
ripple83
f = 10kHz, 200mVP-P
ripple77
Output PowerPOUT
THD+N = 10%
ZSPK = 3I + 22FH,
VPVDD = 5.0V3.7
ZSPK = 4I + 33FH,
VPVDD = 5.0V3
ZSPK = 8I + 68FH,
VPVDD = 5.0V1.7
ZSPK = 8I + 68FH,
VPVDD = 3.7V0.9
THD+N = 1%
ZSPK = 3I + 22FH,
VPVDD = 5.0V2.9
ZSPK = 4I + 33FH,
VPVDD = 5.0V2.4
ZSPK = 8I +68FH
VPVDD = 5.0V1.4
ZSPK = 8I +68FH
VPVDD = 3.7V0.75
Total Harmonic Distortion Plus
NoiseTHD+NfIN = 1kHz
TA = +25NC
ZSPK = 3I +22FH,
POUT = 1.6W,
PVDD = 5.0V
ZSPK = 4I +33FH,
POUT = 650mW,
PVDD = 3.7V
ZSPK = 4I +33FH,
POUT = 1.3W,
VPVDD = 5.0V
ZSPK = 8I +68FH,
POUT = 725mW,
PVDD = 5.0V
Output NoiseA-weighted (Note 3)29FVRMS
MAX98306
Stereo 3.7W Class D Amplifier
Typical Operating Characteristics
(VPVDD = VSHDN = 5.0V, VPGND = 0V, AV = 12dB, RL = J, RL connected between OUT_+ to OUT_-, 20Hz to 22kHz AC measurement
bandwidth, TA = +25NC, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS (continued)
(VPVDD = VSHDN = 3.7V, 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.) (Note 2)
Note 2: This device is 100% production tested at TA = +25NC. All temperature limits are guaranteed by design.
Note 3: Amplifier inputs AC-coupled to ground.
Note 4: Specified at room temperature with an 8I resistive load in series with a 68µH inductive load.
THD+N vs. OUTPUT POWER
MAX98306 toc01
OUTPUT POWER (W)
THD+N (%)
VPVDD = 3.7V
ZLOAD = 8I + 68µH
f = 6kHz
f = 1kHz
f = 100kHz
THD+N vs. OUTPUT POWER
MAX98306 toc02
OUTPUT POWER (W)
THD+N (%)
VPVDD = 5V
ZLOAD = 8I + 68µH
f = 6kHz
f = 1kHz
f = 100kHz
THD+N vs. OUTPUT POWER
MAX98306 toc03
OUTPUT POWER (W)
THD+N (%)
VPVDD = 5V
ZLOAD = 4I + 33µH
f = 6kHz
f = 1kHzf = 100kHz
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Signal-to-Noise RatioSNRZSPK = 8I +68FH, POUT at 1% THD+N99dB
EfficiencyEZSPK = 8I +68FH, POUT = 1.4W, f = 1kHz92%
Oscillator FrequencyfOSC160320540kHz
Spread-Spectrum Bandwidth20kHz
Current LimitTA = +25NC3A
Thermal-Shutdown Level+150NC
Thermal Hysteresis20NC
DIGITAL INPUT (SHDN)
Input-Voltage HighVIH1.4V
Input-Voltage LowVIL0.4V
Input Leakage CurrentTA = +25NC, SHDN = 0±1FA
MAX98306
Stereo 3.7W Class D Amplifier
Typical Operating Characteristics (continued)
(VPVDD = VSHDN = 5.0V, VPGND = 0V, AV = 12dB, RL = J, RL connected between OUT_+ to OUT_-, 20Hz to 22kHz AC measurement
bandwidth, TA = +25NC, unless otherwise noted.)
THD+N vs. OUTPUT POWER
MAX98306 toc04
OUTPUT POWER (W)
THD+N (%)
VPVDD = 5V
ZLOAD = 3I + 22µH
f = 6kHz
f = 1kHzf = 100kHz
THD+N vs. FREQUENCY
MAX98306 toc05
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001100k
VPVDD = 3.7V
ZLOAD = 8I + 68µH
700mW
200mW
THD+N vs. FREQUENCY
MAX98306 toc06
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001100k
VPVDD = 5V
ZLOAD = 8I + 68µH
1.3W
200mW
THD+N vs. FREQUENCY
MAX98306 toc07
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001100k
VPVDD = 5V
ZLOAD = 4I + 33µH
200mW
THD+N vs. FREQUENCY
MAX98306 toc08
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001100k
VPVDD = 5V
ZLOAD = 3I + 22µH
2.5W
500mW
OUTPUT POWER vs. LOAD RESISTANCE
MAX98306 toc09
RLOAD (I)
OUTPUT POWER (W)
VPVDD = 3.7V
f = 1kHz
THD+N = 10%
THD+N = 1%
OUTPUT POWER vs. LOAD RESISTANCE
MAX98306 toc10
OUTPUT POWER (W)
VPVDD = 5V
f = 1kHz
THD+N = 10%
THD+N = 1%
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX98306 toc11
OUTPUT POWER (W)
f = 1kHz
ZLOAD = 8I + 68µH
THD+N = 10%
THD+N = 1%
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX98306 toc12
OUTPUT POWER (W)
THD+N = 1%
THD+N = 10%
f = 1kHz
ZLOAD = 4I + 33µH
MAX98306
Stereo 3.7W Class D Amplifier
Typical Operating Characteristics (continued)
(VPVDD = VSHDN = 5.0V, VPGND = 0V, AV = 12dB, RL = J, RL connected between OUT_+ to OUT_-, 20Hz to 22kHz AC measurement
bandwidth, TA = +25NC, unless otherwise noted.)
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX98306 toc13
OUTPUT POWER (W)
SUPPLY VOLTAGE (V)
THD+N = 1%
THD+N = 10%
f = 1kHz
ZLOAD = 3I + 22µH
GAIN vs. FREQUENCY
MAX98306 toc14
FREQUENCY (Hz)
AMPLITUDE (dB)
10k1k100
-40100k
EFFICIENCY vs. OUTPUT POWER
MAX98306 toc15
OUTPUT POWER (W)
EFFICIENCY (%)
ZLOAD = 8I + 68µH
ZLOAD = 4I + 33µH
ZLOAD = 3I + 22µH
VPVDD = 3.7V
EFFICIENCY vs. OUTPUT POWER
MAX98306 toc16
OUTPUT POWER (W)
EFFICIENCY (%)
ZLOAD = 8I + 68µH
ZLOAD = 4I + 33µH
ZLOAD = 3I + 22µH
VPVDD = 5.0V
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX98306 toc17
SUPPLY CURRENT (mA)
SUPPLY VOLTAGE (V)
CROSSTALK vs. FREQUENCY
MAX98306 toc18
FREQUENCY (Hz)
CROSSTALK (dB)
10k1k100
-140100k
RIGHT TO LEFT
LEFT TO RIGHT
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
MAX98306 toc19
CMRR (dB)
10k1k10010100k
VPVDD = 3.7V
POWER-SUPPLY REJECTION
RATIO vs. FREQUENCY
MAX98306 toc20
PSRR (dB)
FREQUENCY (Hz)
10k1k10010100k
VRIPPLE = 200mVP-P
VPVDD = 3.7V
ZLOAD = 8I + 68µH
WIDEBAND vs. FREQUENCY
MAX98306 toc21
FREQUENCY (MHz)
AMPLITUDE (dBV)1
0.1100
MAX98306
Stereo 3.7W Class D Amplifier
Typical Operating Characteristics (continued)
(VPVDD = VSHDN = 5.0V, VPGND = 0V, AV = 12dB, RL = J, RL connected between OUT_+ to OUT_-, 20Hz to 22kHz AC measurement
bandwidth, TA = +25NC, unless otherwise noted.)
IN-BAND vs. FREQUENCY
MAX98306 toc22
FREQUENCY (Hz)
AMPLITUDE (dB)
10k1k100
-140100k
STARTUP RESPONSE
MAX98306 toc23
TIME (1ms/div)
SHDN
2V/div
OUTL
OUTR
SHUTDOWN RESPONSE
MAX98306 toc24
TIME (1ms/div)
SHDN
2V/div
OUTL
OUTR
