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MAX98500EWE+T-MAX98500EWE+TC26
Boosted 2.2W Class D Amplifier with Automatic Level Control
Boosted 2.2W Class D Amplifier
with Automatic Level Control
19-5189; Rev 0; 5/10
Simplified Block Diagram
General Description
The MAX98500 is a high-efficiency, Class D audio ampli-
fier that features an integrated boost converter to deliver constant output power over a wide range of battery
supply voltages.
The boost converter operates at 2MHz, requiring only a
small (2.2FH) external inductor and capacitor.
The automatic level control has a battery tracking func-
tion that reduces the output swing as the supply voltage
drops, preventing collapse of battery voltage.
The amplifier has differential inputs and an internal fully
differential design. The MAX98500 also features three
gain settings (6dB, 15.5dB, and 20dB) that are select-
able with a logic input.
The MAX98500 is available in a small, 0.5mm pitch
16-bump WLP package (2.1mm x 2.1mm). It is specified
over the extended -40NC to +85NC temperature range.
Applications
Cell Phones
Smartphones
GPS Devices
Mobile Internet Devices
Active Speaker Accessories
Features
S Boosted Class D Output
S Integrated Automatic Level Control
S Output Power
2.2W into 8I, 10% THD+N
1.7W into 8I, 1% THD+N
S Wide 2.5V to 5.5V Supply Voltage Range
S Undervoltage Lockout Protection
S High Total Efficiency of 87%
S High Step-Up Switching Frequency (2MHz)
S Active Emission Limiting for Low EMI
+Denotes a lead(Pb)-free/RoHS-compliant package.
Ordering Information
Typical Application Circuit appears at end of data sheet.
PARTTEMP RANGEPIN-PACKAGE
MAX98500EWE+-40NC to +85NC16 WLP
CONTROL
DIFFERENTIAL
INPUT
BOOST CONVERTER
GAINOUTPUT
STAGE
BATTERY
SPKP
SPKN
PVDD
VCCOUTVBAT
AGNDSPKPGNDBSTPGNDA4D1, C2
RKNEEB3
GAINB2
SDSPKC3
SDBSTD4A3
INPD2
INN
MAX98500
MAX98500
Boosted 2.2W Class D Amplifier
with Automatic Level Control
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.
VBAT to AGND .........................................................-0.3V to +6V
VCCOUT to BSTPGND, AGND .................................-0.3V to +6V
PVDD to SPKPGND .................................................-0.3V to +6V
BSTPGND, SPKPGND to AGND ......................... -0.3V to +0.3V
GAIN to AGND ........................................-0.3V to (VBAT + 0.3V)
SDBST, SDSPK to AGND ......................................-0.3V to VBAT
All Other Pins (excluding LX) to AGND ..................-0.3V to +6V
Current Into/Out of LX, VCCOUT, BSTPGND .....................Q3.9A
Continuous Current Into/Out of SPK_, PVDD,
SPKPGND ..................................................................Q800mA
Continuous Input Current (all other pins) ........................Q20mA
Duration of Short Circuit Between VCCOUT
and BSTPGND ...................................................... Continuous
Duration of SPK_ Short Circuit to PVDD or
SPKPGND ..............................................................Continuous
Duration of Short Circuit Between SPKP
and SPKN ..............................................................Continuous
Continuous Power Dissipation, Multilayer Board (TA = +70NC)
WLP (derate 20.4mW/NC above +70NC)........................1.33W
θJA (Note 1).................................................................49NC/W
Junction Temperature .....................................................+150NC
Operating Temperature Range ..........................-40NC to +85NC
Storage Temperature Range ............................-65NC to +150NC
Soldering Temperature (reflow) ......................................+260NC
ELECTRICAL CHARACTERISTICS
(VBAT = 3.6V, RL = J between SPKP and SPKN, AV = +6dB, CIN = 1FF, 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.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Power-Supply Rejection Ratio
(Note 3)PSRRTA = +25NC, VBAT = 2.5V to 5.5V95dB
Quiescent Current
IVBATTA = +25NC, SDSPK = SDBST = VBAT3.05TA = +25NC, VSDSPK = 0V, SDBST = VBAT0.090.15
IPVDDTA = +25NC, PVDD = 5.55V, SDSPK =
SDBST = VBAT1.72.7
Combined EfficiencyEPOUT = 1.7W, f = 1kHz, ZSPK = 8I + 68FH 87%
Shutdown CurrentISHDNVSDSPK = VSDBST = 0V, TA = +25NC0.041.5FA
Turn-On TimetONTime from power-on to full operation1012ms
BOOST CONVERTER
Battery Supply Voltage RangeVBAT2.55.5V
Soft-Start IntervaltON5.6ms
Undervoltage LockoutUVLOVBAT falling2.12.22.3V
Boost Converter Output VoltageVVCCOUTILOAD = 0mA5.455.55.65V
Output Current LimitIMAXVBAT R = 3.6V1.5A
Input Current LimitILIMITStartup, VCCOUT = 0V0.30.5A
nMOS Current LimitILX,MAX3.3A
pMOS Turn-Off Current Limit10mA
Switching FrequencyfS1.82.02.2MHz
EfficiencyE0.1A P IOUT P 0.75A93%
Startup Short-Circuit TimeConverter latch off50ms
Thermal Shutdown165NCVLX = 0V or 5.5V,
TA = +25NC-1.0+0.1+1.0
MAX98500
Boosted 2.2W Class D Amplifier
with Automatic Level Control
ELECTRICAL CHARACTERISTICS (continued)
(VBAT = 3.6V, RL = J between SPKP and SPKN, AV = +6dB, CIN = 1FF, 20Hz to 22kHz AC measurement bandwidth, TA = TMIN to
TMAX, unless otherwise noted. Typical values are at TA = +25NC.) (Note 2)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
SPEAKER AMPLIFIER
Output Offset VoltageVOSTA = +25NC13mV
Click-and-Pop LevelKCP
Peak voltage, TA =
+25NC, A-weighted, 32
samples per second,
ZSPK = 8I + 68FH,
(Notes 3, 4)
Into shutdown-56
dBV
Out of shutdown-56
Output Power (Note 5)POUTZSPK = 8I + 68FHTHD+N P 1%1.7WTHD+N P 10%2.2
Total Harmonic Distortion Plus
NoiseTHD+Nf = 1kHz, POUT = 850mW, TA = +25NC,
ZSPK = 8I + 68FH0.05%
Output Switching Frequency300kHz
GainAV
GAIN = AGND5.566.5GAIN = unconnected1515.516
GAIN = VBAT19.52020.5
Output Current Limit2A
EfficiencyEPOUT = 1.7W, f = 1kHz, ZSPK = 8I + 68FH92%
Output NoiseA-weighted43FVRMS
Input ResistanceRIN
SDBST = SDSPK =
VBAT
AV = 6dB
(GAIN = AGND) 365472
AV = 15.5dB
(GAIN =
unconnected) 1826
AV = 20dB
(GAIN = VBAT)6.51116
VSDBST = VSDSPK = 0VAll gain settings110
Common-Mode Rejection RatioCMRRf = 1kHz60dB
Bias VoltageVBIAS1.31.41.5V
ALC
Attack Time20Fs/dB
Release Time1.6s/dB
Maximum Attenuation8dB
Attenuation Resolution0.5dB
Knee VoltageVKNEETA = +25NC
RKNEE = 154kI2.192.32.42RKNEE = 40.5kI3.143.33.47
RKNEE = 13kI3.713.94.10
MAX98500
Boosted 2.2W Class D Amplifier
with Automatic Level Control
ELECTRICAL CHARACTERISTICS (continued)
(VBAT = 3.6V, RL = J between SPKP and SPKN, AV = +6dB, CIN = 1FF, 20Hz to 22kHz AC measurement bandwidth, TA = TMIN to
TMAX, unless otherwise noted. Typical values are at TA = +25NC.) (Note 2)
Note 2: 100% production tested at TA = +25NC. Specifications over temperature limits are guaranteed by design.
Note 3: Amplifier inputs are AC-coupled to AGND.
Note 4: Mode transitions are controlled by SDSPK.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Knee ResistorRKNEETA = +25NC,
AV = 15.5dB
VKNEE = 3.25V43.2
VKNEE = 3.35V37.4
VKNEE = 3.45V32.4
VKNEE = 3.55V27.4
VKNEE = 3.65V23.2
VKNEE = 3.75V18.7
VKNEE = 3.85V15.0
DIGITAL INPUTS (SDBST, SDSPK)
Input Voltage HighViH1.4V
Input Voltage LowVIL0.4V
Input CapacitanceCIN10pF
Input Leakage CurrentIINTA = +25NC-1.0+1.0FA
MAX98500
Boosted 2.2W Class D Amplifier
with Automatic Level Control
Typical Operating Characteristics
(VBAT = 3.6V, RL = ∞ between SPKP and SPKN, AV = +15.5dB, RKNEE = VBAT, 20Hz to 22kHz AC measurement bandwidth, unless
otherwise noted.)
General
BATTERY CURRENT
vs. BATTERY VOLTAGE
MAX98500 toc01
BATTERY VOLTAGE (V)
BATTERY CURRENT (mA)
INPUTS AC-COUPLED TO AGND
SDSPK = SDBST = VBAT
BATTERY CURRENT
vs. BATTERY VOLTAGE
MAX98500 toc02
BATTERY VOLTAGE (V)
BATTERY CURRENT (µA)
INPUTS AC-COUPLED TO AGND
SDSPK = GND, SDBST = VBAT
BATTERY CURRENT
vs. BATTERY VOLTAGE
MAX98500 toc03
BATTERY VOLTAGE (V)
BATTERY CURRENT (µA)
INPUTS AC-COUPLED TO AGND
SDSPK = VBAT, SDBST = AGND
TURN-ON RESPONSE
MAX98500 toc04
VCCOUT
2V/div
SPKR
OUTPUT
1V/div
SDBST
2V/div
2ms/div
EFFICIENCY vs. OUTPUT POWER
MAX98500 toc05
EFFICIENCY (%)
VBAT = 4.2V
VBAT = 3.6V
VBAT = 3.0V
ZLOAD = 8I + 68µH
fIN = 1kHz
MAX98500
Boosted 2.2W Class D Amplifier
with Automatic Level Control
Typical Operating Characteristics (continued)
(VBAT = 3.6V, RL = ∞ between SPKP and SPKN, AV = +15.5dB, RKNEE = VBAT, 20Hz to 22kHz AC measurement bandwidth, unless
otherwise noted.)
Speaker
THD+N vs. FREQUENCY
MAX98500 toc06
FREQUENCY (kHz)
THD+N (%)10.1
ZLOAD = 8I + 68µH
POUT = 1.4W
POUT = 400mW
THD+N vs. OUTPUT POWER
MAX98500 toc07
OUTPUT POWER (W)
THD+N (%)
ZLOAD = 8I + 68µH
f = 6kHz
f = 1kHz
f = 100Hz
OUTPUT POWER vs. LOAD RESISTANCE
MAX98500 toc08
LOAD RESISTANCE (I)
OUTPUT POWER (W)
fIN = 1kHz
ZSPRK = LOAD + 68µF
THD+N = 10%
THD+N = 1%
OUTPUT POWER vs. BATTERY VOLTAGE
MAX98500 toc09
BATTERY VOLTAGE (V)
OUTPUT POWER (W)
fIN = 1kHz
ZSPRK = 8I + 68µH
THD+N = 1%
THD+N = 10%
GAIN vs. FREQUENCY
MAX98500 toc10
GAIN (dB)
ZLOAD = 8I + 68µHAV = 20dB
AV = 6dB
AV = 15.5dB
MAX98500
Boosted 2.2W Class D Amplifier
with Automatic Level Control
Typical Operating Characteristics (continued)
(VBAT = 3.6V, RL = ∞ between SPKP and SPKN, AV = +15.5dB, RKNEE = VBAT, 20Hz to 22kHz AC measurement bandwidth, unless
otherwise noted.)
SPEAKER POWER-SUPPLY REJECTION
RATIO vs. FREQUENCY
MAX98500 toc11
FREQUENCY (kHz)
PSRR (dB)10.1
VRIPPLE AT PVDD = 200mVP-P
INPUTS AC-COUPLED AGND
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
MAX98500 toc12
FREQUENCY (kHz)
CMRR (dB)10.1
AV = 6dB
AV = 20dB
AV = 15.5dB
ZLOAD = 8I + 68µH
SHUTDOWN RESPONSE
MAX98500 toc13
SPKR
OUTPUT
1V/div0V
40µs/div
SDSPK
2V/div
TURN-ON RESPONSE
MAX98500 toc14
SPKR
OUTPUT
1V/div
1ms/div
SDSPK
2V/div
SDBST = VBAT
CLIPPING RESPONSE
MAX98500 toc15
SPKR
OUTPUT
500mV/div0V
200µs/div
THD+N = 10%
WIDEBAND OUTPUT SPECTRUM
MAX98500 toc16
AMPLITUDE (dBV)
RBW = 100Hz
AUDIO INPUTS AC-GROUNDED
INBAND OUTPUT SPECTRUM
MAX98500 toc17
AMPLITUDE (dBV)105
fIN = 1kHz
OUTPUT = -60dBV
MAX98500
Boosted 2.2W Class D Amplifier
with Automatic Level Control
Typical Operating Characteristics (continued)
(VBAT = 3.6V, RL = ∞ between SPKP and SPKN, AV = +15.5dB, RKNEE = VBAT, 20Hz to 22kHz AC measurement bandwidth, unless
otherwise noted.)
Boost Converter
EFFICIENCY vs. OUTPUT CURRENT
MAX98500 toc18
IOUT (mA)
EFFICIENCY (%)
VBAT = 5VVBAT = 4.2V
VBAT = 4V
VBAT = 3.6V
VBAT = 3V
VBAT = 3.3V
LOAD REGULATION vs. OUTPUT CURRENT
MAX98500 toc19
IOUT (mA)
LOAD REGULATION (%)
VBAT = 5V
VBAT = 4.2V
VBAT = 4V
VBAT = 3V
VBAT = 3.3V
VBAT = 3.6V
OUTPUT VOLTAGE vs. OUTPUT CURRENT
MAX98500 toc20
IOUT (A)
OUTPUT VOLTAGE (V)
VBAT = 3V
VBAT = 3.3V
VBAT = 3.6V
VBAT = 4.2V
VBAT = 5V
SWITCHING FREQUENCY
vs. BATTERY VOLTAGE
MAX98500 toc21
BATTERY VOLTAGE (V)
SWITCHING FREQUENCY (MHz)
IOUT = 100mA
IOUT = 500mA
SOFT-START
MAX98500 toc22
VCCOUT
2V/div
SDBST
2V/div
