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MAX98400BETG+T
Stereo, High-Power, Class D Amplifier
Stereo, High-Power, Class D Amplifiers
MAX98400A/MAX98400B
General Description
The MAX98400A/MAX98400B Class D amplifiers provide
high-performance, thermally efficient amplifier solutions. The
MAX98400A delivers 2x20W into 8I loads or 1x40W into a
4I load. The MAX98400B delivers 2x12W into 8I loads.
An integrated limiting circuit prevents output clipping
distortion, protects small speakers from transient volt-
ages, and reduces power dissipation.
A thermal-foldback feature can be enabled to automati-
cally reduce the output power at above a junction tem-
perature of +120NC. Traditional thermal protection is also
available in addition to robust overcurrent protection.
The ICs operate from a single 8V to 28V supply and
provide a high 67dB PSRR, eliminating the need for a
regulated power supply. They offer up to 90% efficiency
from a 12V supply.
Filterless modulation allows the ICs to pass EN55022B
EMI limits with 1m cables using only a low-cost ferrite
bead and small-value capacitor on each output.
Both devices feature eight digitally controlled gain settings.
Comprehensive click-and-pop reduction circuitry mini-
mizes noise coming into and out of shutdown.
The MAX98400A/MAX98400B are available in 36-pin
and 24-pin TQFN packages, respectively, and are speci-
fied over the -40NC to +85NC temperature range.
FeaturesWide 8V to 28V Supply Voltage RangeSingle-Supply OperationLow EMI: Active Emissions LimitingClipping LimiterLow Quiescent CurrentThermal FoldbackThermal and Overcurrent Protection
Applications
LCD/PDP Televisions
LCD Monitors
MP3 Docking Stations
Notebook PCs
Ordering Information
19-5286; Rev 0; 6/10
Simplified Block Diagram
Note: Devices operate over the -40°C to +85°C temperature
range.
*EP = Exposed pad.
EVALUATION KIT
AVAILABLE
PARTPIN-PACKAGESPEC
MAX98400AETX+36 TQFN-EP* 2x20W
MAX98400BETG+24 TQFN-EP*2x12W
INR-
INR+
OUTR-
OUTR+
PGACLIPPING
LIMITER
CLASS D
MODULATOR
AND H-BRIDGE
INL-
INL+
OUTL-
OUTL+
MONO*
PGACLIPPING
LIMITER
CLASS D
MODULATOR
AND H-BRIDGE
*MAX98400A ONLY
MAX98400A/B
Stereo, High-Power, Class D Amplifiers
MAX98400A/MAX98400B
TABLE OF CONTENTS
Absolute Maximum Ratings ......................................................................4
Electrical Characteristics ........................................................................4
Typical Operating Characteristics .................................................................7
Pin Configurations ............................................................................12
Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Stereo Configuration for MAX98400A .............................................................14
Mono Configuration for MAX98400A..............................................................15
Detailed Description...........................................................................15
Efficiency..................................................................................16
Shutdown..................................................................................16
Click-and-Pop Suppression ...................................................................16
Mono Configuration..........................................................................16
Clipping Limiter.............................................................................16
Limiter Threshold Control (LIM_TH)...........................................................17
Release Time Control (RELEASE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Preamplifier Gain Setting .....................................................................18
Protection .................................................................................18
Thermal Foldback ........................................................................18
Overtemperature Protection.................................................................18
Overcurrent Protection.....................................................................18
Applications Information........................................................................18
Filterless Class D Operation ...................................................................18
Inductor-Based Output Filters..................................................................19
Component Selection ........................................................................19
Input Capacitor...........................................................................19
Power Supplies...........................................................................19
Internal Regulator VS ......................................................................19
Supply Bypassing, Layout, and Grounding .......................................................19
Chip Information..............................................................................19
Functional Diagrams...........................................................................20
Package Information...........................................................................22
Revision History ..............................................................................26
Stereo, High-Power, Class D Amplifiers
MAX98400A/MAX98400B
LIST OF FIGURES
Figure 1. MAX98400B EMI Performance...........................................................18
Figure 2. MAX98400A Efficiency vs. Class AB Effifciency .............................................18
Figure 3. Limiter Control, Mode3 Configuration (Table 1) ..............................................19
Figure 4. Output Filter for PWM Mode.............................................................21
LIST OF TABLES
Table 1. Limiter Control Modes ..................................................................19
Table 2. Gain Selection ........................................................................20
Table 3. Filter Component Selection ..............................................................21
Stereo, High-Power, Class D Amplifiers
MAX98400A/MAX98400B
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 +30V
VS to GND ...............................................................-0.3V to +6V
SHDN, MONO to GND ............................................-0.3V to +6V
IN_ to GND ..............................................................-0.3V to +6V
G1, G2, RELEASE, TEMPLOCK,
LIM_TH to GND ........................................-0.3V to (VS + 0.3V)
OUT_ to PGND ......................................-0.3V to (VPVDD + 0.3V)
PGND to GND ......................................................-0.3V to +0.3V
Continuous Current into OUT_ ..........................................+2.4A
Continuous Current into PVDD, PGND .............................+4.8A
Continuous Current into All Other Pins ...........................+10mA
Duration of OUT_ Short Circuit to PVDD or PGND ...Continuous
Duration of Short Circuit Between
OUT_+ and OUT_- .................................................Continuous
Continuous Power Dissipation (TA = +70NC)
36-Pin TQFN Multilayer Board
(derate 35.7mW/NC above +70NC) .........................2857.1mW
BJA (Note 1) .............................................................28NC/W
BJC (Note 1) ...............................................................1NC/W
24-Pin TQFN Multilayer Board
(derate 27.8mW/NC above +70NC) .............................35.7mW
BJA (Note 1) .............................................................36NC/W
BJC (Note 1) ...............................................................3NC/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 = 18V, CIN = 1FF, VSHDN = 5V, LIM_TH = VS, TEMPLOCK = unconnected; G1 = GND, G2 = open (gain = 20.1dB), CREL
= 1FF, C1 = C2 = 1FF, RL = J, AC measurement bandwidth 20Hz to 20kHz, differential input signal, 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 DC CHARACTERISTICS
PVDD Supply Voltage RangeVPVDDInferred from PVDD_PSRR828V
VS Supply Input VoltageVSInferred from IVS test4.755.5V
Quiescent CurrentIPVDDDual-supply mode:
VS = 4.75V, TA = +25NC15mAIVS68.2
Single-Supply
Quiescent CurrentIPVDD
Single-supply mode:
TA = +25NC1623mA
RL = 8I (Note 3)17
Shutdown CurrentISHDN_PVDDVSHDN = 0V, TA = +25NC,
VS = 5.5V20FAISHDN_VS310
PVDD Undervoltage LockoutVUVLO77.9V
VS Regulator Output VoltageVS4.24.474.75V
INPUT STAGE
Differential Input Voltage Range2VRMS
Single-Ended Input Voltage
Range1VRMS
Common-Mode Rejection RatioCMRR60dB
Input ResistanceDifferential VLIM_TH = 0V, gain = +35dB2032kI
Stereo, High-Power, Class D Amplifiers
MAX98400A/MAX98400B
ELECTRICAL CHARACTERISTICS (continued)
(VPVDD = 18V, CIN = 1FF, VSHDN = 5V, LIM_TH = VS, TEMPLOCK = unconnected; G1 = GND, G2 = open (gain = 20.1dB), CREL
= 1FF, C1 = C2 = 1FF, RL = J, AC measurement bandwidth 20Hz to 20kHz, differential input signal, TA = TMIN to TMAX, unless
otherwise noted. Typical values are at TA = +25NC.) (Notes 2, 3)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
POWER STAGE
Shutdown to Full OperationtSON11ms
Gain Accuracy Q0.8Q4%
Left-to-Right Gain MatchingAll gain settingsQ2%
Crosstalk1kHz-85dB10kHz-68
Output Offset VoltageVOSTA = +25NCQ8Q45mV
Click-and-Pop LevelKCP
Peak voltage,
32 samples/s,
A-weighted,
TA = +25NC (Notes 4, 5)
Into
shutdown-47
dBVOut of
shutdown-56
PVDD Power-Supply Rejection
RatioPSRRPVDD
VPVDD = 8V to 28V52631kHz, 100mVP-P ripple67
10kHz, 100mVP-P ripple57
VS Power-Supply Rejection RatioPSRRVS
VS = 4.75V to 5.5V39551kHz, 100mVP-P ripple50
10kHz, 100mVP-P ripple40
MAX98400A Output PowerPOUT
Stereo, RL = 8I, 10% THD+N,
fIN = 1kHz (Note 3)22Mono, RL = 4I, 10% THD+N,
fIN = 1kHz (Note 3)44
MAX98400B Output PowerPOUTStereo, RL = 8I, 10% THD+N,
fIN = 1kHz (Note 3)15
Total Harmonic Distortion Plus
NoiseTHD+N
POUT = 0.1W to POUT/2, fIN = 20Hz to
20kHz, RL = 8I 0.3%
POUT/2, fIN = 1kHz, RL = 8I0.03
Output NoiseVNA-weighted100FVRMS
EfficiencyEPOUT = 2x20W, RL = 8I (MAX98400A)
fIN = 1kHz (Note 3)90%
Current LimitILIM3.55A
Output FET ResistanceRDSON0.4I
Switching FrequencyfSW265330395kHz
Peak Output VoltageVPVDD = 28V2026V
LIMITER
Attack TimeVLIM_TH = 0V240500Fs
Release TimeVLIM_TH = 0V0.8s
Maximum Trigger LevelVPVDD = 14V (Note 6)4dBFS
Minimum Trigger Level(Note 7)-6dBFS
Trigger LevelVLIM_TH = 0V-10+1dBFS
Stereo, High-Power, Class D Amplifiers
MAX98400A/MAX98400B
Note 2: 100% production tested at TA = +25NC. Specifications over temperature limits are guaranteed by design.
Note 3: The MAX98400A stereo mode is specified with an 8I resistive load in series with a 68FH inductive load connected across
BTL outputs. The MAX98400A mono mode is specified with a 4I resistive load in series with 33FH inductive load. The
MAX98400B is specified with an 8I resistive load in series with a 68FH inductive load connected across BTL outputs.
Note 4: Amplifier inputs AC-coupled to GND.
Note 5: Mode transitions controlled by SHDN.
Note 6: Relative to equivalent full-scale undistorted output. Full scale (FS) = VPVDD x 0.95.
Note 7: Relative to equivalent full-scale undistorted output. Full scale (FS) = VPVDD.
ELECTRICAL CHARACTERISTICS (continued)
(VPVDD = 18V, CIN = 1FF, VSHDN = 5V, LIM_TH = VS, TEMPLOCK = unconnected; G1 = GND, G2 = open (gain = 20.1dB), CREL
= 1FF, C1 = C2 = 1FF, RL = J, AC measurement bandwidth 20Hz to 20kHz, differential input signal, TA = TMIN to TMAX, unless
otherwise noted. Typical values are at TA = +25NC.) (Notes 2, 3)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
VGA Distortion Compression = 0 to -12dB3.5%
LIM_TH Input-Voltage Low
(PVDD Tracking)0.15V
LIM_TH Input-Voltage High
(Limiter Off)
- 1V
Channel-to-Channel Attenuation
TrackingQ1dB
THERMAL FOLDBACK
Internal Templock Resistor120205310kI
Trigger Temperature+130NC
Hard Thermal Protection+165NC
LOGIC INPUT (G1, G2)
Sink CurrentTA = +25NC, VG1, VG2 = 0V +2.5+5+8FA
Source CurrentTA = +25NC, VG1, VG2 = VS-8-5-2.5FA
Input High Threshold0.8 x V
Input Low Threshold0.3 x V
Input Three-State Window0.45 x
0.5 x
0.55 x V
LOGIC INPUT (SHDN, MONO (MAX98400A Only))
Input Leakage CurrentIINTA = +25NCQ10FA
Input High ThresholdVINH2V
Input Low ThresholdVINL0.4V
Input-Voltage Hysteresis100mV
Stereo, High-Power, Class D Amplifiers
MAX98400A/MAX98400B
Typical Operating Characteristics
(MAX98400A, VPVDD = 18V, VSHDN = 5V, LIM_TH = VS, TEMPLOCK = unconnected; G1 = GND, G2 = open (gain = 20.1dB), CIN =
CREL = C1 = C2 = 1FF, typical values are at TA = +25NC, unless otherwise noted.)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX98400 toc01
FREQUENCY (kHz)
THD+N (%)10.1
POUT = 0.5W
VPVDD = 12V
8I LOAD
POUT = 4W
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX98400 toc02
FREQUENCY (kHz)
THD+N (%)10.1
POUT = 1W
VPVDD = 12V
4I LOAD
POUT = 7W
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX98400 toc03
FREQUENCY (kHz)
THD+N (%)10.1
POUT = 1WVPVDD = 18V
8I LOAD
POUT = 10W
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX98400 toc04
OUTPUT POWER (W)
THD+N (%)8642
f = 6kHz
f = 1kHz
VPVDD = 12V
8I LOADf = 100Hz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX98400 toc05
OUTPUT POWER (W)
THD+N (%)161284
f = 6kHz
f = 1kHz
VPVDD = 18V
8I LOADf = 100Hz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX98400 toc06
OUTPUT POWER (W)
THD+N (%)3224168
f = 6kHz
f = 1kHz
f = 100Hz
VPVDD = 24V
RL = 8I
STOPS BEFORE 10% THD+N
DUE TO THERMAL LIMITING OF
THERMAL FOLDBACK FEATURE
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX98400 toc071412108642018
THD+N (%)
f = 6kHz
f = 1kHz
f = 100HzVPVDD = 12V
4I LOAD
EFFICIENCY vs. OUTPUT POWER
MAX98400 toc08
EFFICIENCY (%)161214468102
VPVDD = 12V,
8I LOAD,
BOTH CHANNELS DRIVEN
EFFICIENCY vs. OUTPUT POWER
MAX98400 toc0930202510155040
EFFICIENCY (%)
VPVDD = 18V,
8I LOAD,
BOTH CHANNELS DRIVEN
Stereo, High-Power, Class D Amplifiers
MAX98400A/MAX98400B
Typical Operating Characteristics (continued)
(MAX98400A, VPVDD = 18V, VSHDN = 5V, LIM_TH = VS, TEMPLOCK = unconnected; G1 = GND, G2 = open (gain = 20.1dB), CIN =
CREL = C1 = C2 = 1FF, typical values are at TA = +25NC, unless otherwise noted.)
MAX98400 toc10
TOTAL OUTPUT POWER (W)40302010060
EFFICIENCY vs. OUTPUT POWER
EFFICIENCY (%)
VPVDD = 24V,
8I LOAD,
BOTH CHANNELS DRIVEN
MAX98400 toc11
TOTAL OUTPUT POWER (W)2010040
EFFICIENCY vs. OUTPUT POWER
EFFICIENCY (%)
VPVDD = 12V,
4I LOAD,
BOTH CHANNELS DRIVEN
MAXIMUM OUTPUT POWER vs. SUPPLY VOLTAGE
(WITH THERMAL SHUTDOWN)
MAX98400 toc12
SUPPLY VOLTAGE (V)
MAXIMUM OUTPUT POWER (W)201612
8I LOAD, BOTH
CHANNELS ARE DRIVEN
10% THD+N
1% THD+N
MAXIMUM OUTPUT POWER vs. SUPPLY VOLTAGE
(WITH THERMAL SHUTDOWN)
MAX98400 toc13
SUPPLY VOLTAGE (V)
MAXIMUM OUTPUT POWER (W)121016
10% THD+N
1% THD+N
4I LOAD, BOTH CHANNELS ARE DRIVEN
OUTPUT POWER vs. LOAD
MAX98400 toc14
LOAD (I)
OUT
(W)8010203050604070100
VPVDD = 12V
10% THD+N
1% THD+N
OUTPUT POWER vs. LOAD
MAX98400 toc15
LOAD (I)
OUT
(W)8060702030405010100
10% THD+N
1% THD+N
VPVDD = 18V
OUTPUT POWER vs. LOAD
MAX98400 toc16
OUT
(W)8010203050604070100
10% THD+N
1% THD+N
VPVDD = 24V
POWER-SUPPLY REJECTION RATIO
MAX98400 toc17
PSRR (dB)10.1
100mVP-P RIPPLE
FREQUENCY (kHz)100
CROSSTALK (dB)0.10.01
CROSSTALK vs. FREQUENCY
MAX98400 toc18
8I LOAD,
POUT = 1W,
f = 1kHz
-100
Stereo, High-Power, Class D Amplifiers
MAX98400A/MAX98400B
Typical Operating Characteristics (continued)
(MAX98400A, VPVDD = 18V, VSHDN = 5V, LIM_TH = VS, TEMPLOCK = unconnected; G1 = GND, G2 = open (gain = 20.1dB), CIN =
CREL = C1 = C2 = 1FF, typical values are at TA = +25NC, unless otherwise noted.)
INBAND OUTPUT SPECTRUM
MAX98400 toc19
FREQUENCY (kHz)
OUTPUT AMPLITUDE (dBV)105
8I LOAD
FREQUENCY (MHz)
OUTPUT AMPLITUDE (dBV)10.1100
WIDEBAND OUTPUT SPECTRUM
MAX98400 toc20
RBW = 100Hz
MAX98400 toc21
OUTPUT
2V/div
4ms/div
SHDN ON/OFF RESPONSE
SHDN
2V/div
SUPPLY CURRENT
vs. PVDD SUPPLY VOLTAGE
MAX98400 toc22
PVDD SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)20
IPVDD
VS = 5V1228
IVS
SUPPLY CURRENT
vs. VS SUPPLY VOLTAGE
MAX98400 toc23
VS SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
IPVDD
VPVDD = 18V
IVS
SHUTDOWN CURRENT
vs. PVDD SUPPLY VOLTAGE
MAX98400 toc24
PVDD SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT (µA)20161228
IPVDD_SHDN
VS = 5V
IVS_SHDN
SHUTDOWN CURRENT
vs. VS SUPPLY VOLTAGE
MAX98400 toc25
SHUTDOWN CURRENT (µA)
IPVDD_SHDN
IVS_SHDN
VPVDD = 18V
MAXIMUM P
OUT
(W)20
8I LOAD1228
MAXIMUM OUTPUT POWER
vs. PVDD (NO THERMAL SHUTDOWN)
MAX98400 toc26
4I LOAD
THERMAL FOLDBACK DISABLED,
BOTH CHANNELS DRIVEN
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (MONO)
MAX98400 toc27
THD+N (%)10.1
POUT = 8W
POUT = 1W
VPVDD = 12V
4I LOAD
Stereo, High-Power, Class D Amplifiers
MAX98400A/MAX98400B
Typical Operating Characteristics (continued)
(MAX98400A, VPVDD = 18V, VSHDN = 5V, LIM_TH = VS, TEMPLOCK = unconnected; G1 = GND, G2 = open (gain = 20.1dB), CIN =
CREL = C1 = C2 = 1FF, typical values are at TA = +25NC, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (MONO)
MAX98400 toc28
OUTPUT POWER (W)
THD+N (%)161284
f = 6kHz
f = 100Hz
f = 1kHz
VPVDD = 12V,
4I LOAD
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (MONO)
MAX98400 toc29
OUTPUT POWER (W)
THD+N (%)3224168
f = 6kHz
f = 100Hz
f = 1kHz
VPVDD = 18V,
4I LOAD
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (MONO)
MAX98400 toc30
OUTPUT POWER (W)
THD+N (%)605040302010
f = 6kHz
f = 100Hz
f = 1kHz
VPVDD = 24V,
4I LOAD
EFFICIENCY vs. OUTPUT POWER (MONO)
MAX98400 toc31
TOTAL OUTPUT POWER (W)
EFFICIENCY (%)105
VPVDD = 12V,
4I LOAD
MAX98400 toc3230202510155040
EFFICIENCY vs. OUTPUT POWER (MONO)
TOTAL OUTPUT POWER (W)
EFFICIENCY (%)
VPVDD = 18V,
4I LOAD
MAX98400 toc3330202510155040
EFFICIENCY vs. OUTPUT POWER (MONO)
TOTAL OUTPUT POWER (W)
EFFICIENCY (%)
VPVDD = 24V,
4I LOAD
MAXIMUM OUTPUT POWER
vs. PVDD (WITH THERMAL SHUTDOWN, MONO)
MAX98400 toc34
MAXIMUM P
OUT
(W)201612828
4I LOAD, THERMAL FOLD DISABLED
10% THD+N
1% THD+N
OUTPUT POWER vs. LOAD (MONO)
MAX98400 toc35
OUT
(W)8070605040302010100
VPVDD = 12V
10% THD+N
1% THD+N
OUTPUT POWER vs. LOAD (MONO)
MAX98400 toc36
OUT
(W)80706050403020100100
VPVDD = 18V
10% THD+N
1% THD+N
Stereo, High-Power, Class D Amplifiers
MAX98400A/MAX98400B
Typical Operating Characteristics (continued)
(MAX98400A, VPVDD = 18V, VSHDN = 5V, LIM_TH = VS, TEMPLOCK = unconnected; G1 = GND, G2 = open (gain = 20.1dB), CIN =
CREL = C1 = C2 = 1FF, typical values are at TA = +25NC, unless otherwise noted.)
OUTPUT POWER vs. LOAD (MONO)
MAX98400 toc37
LOAD (I)
OUT
(W)8010203050604070100
VPVDD = 24V
10% THD+N
1% THD+N
SUPPLY CURRENT
vs. PVDD SUPPLY VOLTAGE (MONO)
MAX98400 toc38
PVDD SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)20161228
VS = 5V
IPVDD
IVS
SUPPLY CURRENT
vs. VS SUPPLY VOLTAGE (MONO)
MAX98400 toc39
VS SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
VPVDD = 18V
IPVDD
IVS
PVDD SUPPLY VOLTAGE (V)
MAXIMUM P
OUT
(W)20161228
MAXIMUM OUTPUT POWER
vs. PVDD (NO THERMAL SHUTDOWN, MONO)
MAX98400 toc40
4I LOAD, THERMAL FOLD DISABLED
LIMITER TRANSFER CHARACTERISTIC
MAX98400 toc41
OUTPUT VOLTAGE (V)
RL = 8I + 68µH
LIM_TH = GND
VPVDD = 8V
VPVDD = 18V
VPVDD = 24V
MAX98400 toc42
OUTPUT
4V/div
200ms/div
tRELEASE
LIMITER RELEASE TIME
INPUT
2V/div
LIM_TH = GND
Stereo, High-Power, Class D Amplifiers
MAX98400A/MAX98400B
Pin Descriptions
Pin Configurations
N.C.
INR+
GND
GND
INL+
LIM_TH
MONO
INL-
INR-PGND
PVDD
PVDD
PGND
PGND
N.C.
N.C.18
N.C.
N.C.
N.C.O
N.C.S
TQFNTOP VIEW
PVDD
PGND23456782625242322212019EP
TQFN234561716151413
PGND
PVDD
PGND
PVDD
PGNDG2
PGND
INR+
GND
INR-
INL-
LIM_TH
INL+TOP VIEWEP
MAX98400AMAX98400B
PINNAMEFUNCTIONMAX98400AMAX98400B
1, 21, 2OUTL-Negative Left Speaker Output
3, 7, 18, 22,
25, 28, 36—N.C.No Connection
4, 53OUTL+Positive Left Speaker Output4VS5V Regulator Supply. Bypass VS to GND with a 1µF capacitor. Connect to a
+5V source for dual-supply operation.5G1Three-State Input for Gain Selection 1. See the Detailed Description section.6G2Three-State Input for Gain Selection 2. See the Detailed Description section.7LIM_TH
See the Limiter Threshold Control (LIM_TH) section for details.
Connect to:
1) VS to disable limiter.
2) GND to have no clipping.
3) RLIM1 resistor to GND to have a PVDD tracking threshold.
4) RLIM1 and RLIM2 resistor-divider to have an absolute threshold.
Stereo, High-Power, Class D Amplifiers
MAX98400A/MAX98400B
Pin Descriptions (continued)
PINNAMEFUNCTIONMAX98400AMAX98400B8INL+Left-Channel Positive Analog Input9INL-Left-Channel Negative Analog Input —MONOMono Operation. Connect MONO to GND for stereo operation. Connect MONO
to VS for mono operation.
14, 1510GNDAnalog Ground11INR-Right-Channel Negative Analog Input 12INR+Right-Channel Positive Analog Input 13TEMPLOCK
See the Thermal Foldback section for details.
Connect to:
1) GND to disable thermal foldback.
2) Leave open to enable thermal foldback.14RELEASESets the Limiter Time Constant. Connect to GND through 1FF.15SHDN
Active-Low Shutdown Input
Low = shutdown
High = enable
23, 2416OUTR+Positive Right Speaker Output
26, 2717, 18OUTR-Negative Right Speaker Output
29, 30, 34, 3519, 20,
23, 24PGNDPower Ground
31, 32, 3321, 22PVDDPower Supply. Bypass PVDD to PGND with 1FF and 200FF capacitors. —EPExposed Pad. Connect to PGND for optimum thermal performance.
