MAX98306 Datasheet by Maxim Integrated

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MAX98306 Stereo 3.7W Class D Amplifier d uH WH \ 4 M $ m. + , own. m wk maxim Integrated ,,
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 control
circuitry combined with a filterless spread-spectrum modu-
lation scheme (SSM) provide excellent EMI performance
while eliminating the need for output filtering found in tradi-
tional 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 -40°C to
+85°C temperature range.
Applications
Features
Output Power 3.7W at 3Ω, 10% THD, 1.7W at 8Ω,
10% THD, with 5V Supply
Passes EMI Limit Unfiltered with Up to 12in of
Speaker Cable
High 83dB PSRR at 217Hz
Spread-Spectrum Modulation and Active
Emissions Limiting
Five Pin-Selectable Gains
Excellent Click-and-Pop Suppression
Thermal and Overcurrent Protection
Low-Current Shutdown Mode
Space-Saving, 3mm x 3mm x 0.75mm,
14-Pin TDFN
Smartphones
Tablets
Cellular Phones
Accessory Speakers
MP3 Players
Portable Audio Players
VoIP Phones
19-5919; Rev 2; 12/17
+Denotes a lead(Pb)-free/RoHS-compliant package.
PART TEMP RANGE PIN-
PACKAGE
TOP
MARK
MAX98306ETD+ -40°C to +85°C 14 TDFN +AEV
Ordering Information
INL+ OUTL+
OUTL-
OUTR-
OUTR+
INL-
INR-
INR+
GAIN GAIN
CONTROL
1µF
1µF
1µF
1µF
PVDD
PVDD
PGND
SHDN
MAX98306
0.1µF 10µF
+2.6V TO +5.5V
PVDD
Typical Application Circuit
MAX98306 Stereo 3.7W Class D Amplifier
EVALUATION KIT AVAILABLE
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
Junction-to-Ambient Thermal Resistance JA) ..............41°C/W
Junction-to-Case Thermal Resistance JC) .....................8°C/W
(Note 1)
(VPVDD = VSHDN = 3.7V, VPGND = 0V, AV = 12dB (GAIN = PVDD), RL = ∞, RL connected between OUT_+ to OUT_-, 20Hz to 22kHz
AC measurement bandwidth, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
GENERAL
Supply Voltage Range VPVDD Guaranteed by PSRR test 2.6 5.5 V
Undervoltage Lockout UVLO 1.8 2.3 V
Quiescent Supply Current IPVDD
VPVDD = 3.7V 2 2.7 mA
VPVDD = 5.0V 2.6
Shutdown Supply Current ISHDN VSHDN = 0, TA = +25°C < 1 10 µA
Turn On Time tON 3.2 10 ms
Bias Voltage VBIAS 1.62
VPVDD/2
2.15 V
Voltage Gain AV
GAIN = PGND 17.5 18 18.5
dB
GAIN = 100kΩ to PGND 14.5 15 15.5
GAIN = PVDD 11.5 12 12.5
GAIN = 100kΩ to PVDD 8.5 9 9.5
GAIN = unconnected 5.5 6 6.5
Channel-to-Channel Gain
Tracking 0.1 %
Input Resistance RIN
AV = 18dB (GAIN = PGND) 22 33
kΩ
AV = 15Db (GAIN = 100kΩ to PGND) 31 46
AV = 12dB (GAIN = PVDD) 44 65
AV = 9dB (GAIN = 100kΩ to PVDD) 62 93
AV = 6dB (GAIN = unconnected) 89 131
Common-Mode Rejection Ratio CMRR fIN = 1kHz, input referred 79 dB
Output Offset Voltage VOS TA = +25°C (Note 3) ±1 ±3 mV
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 www.maximintegrated.com/thermal-tutorial.
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.
Package Thermal Characteristics
Electrical Characteristics
MAX98306 Stereo 3.7W Class D Amplifier
www.maximintegrated.com Maxim Integrated
2
(VPVDD = VSHDN = 3.7V, VPGND = 0V, AV = 12dB (GAIN = PVDD), RL = ∞, RL connected between OUT_+ to OUT_-, 20Hz to 22kHz
AC measurement bandwidth, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Click-and-Pop Level KCP
Peak voltage, TA = +25°C
A-weighted, 32 samples
per second (Notes 3, 4)
Into shutdown -79
dBV
Out of shutdown -73
Power-Supply Rejection Ratio PSRR TA = +25°C
(Note 3)
VPVDD = 2.6V to 5.5V,
TA = +25°C 70 95
dB
f = 217Hz, 200mVP-P
ripple 83
f = 1kHz, 200mVP-P
ripple 83
f = 10kHz, 200mVP-P
ripple 77
Output Power POUT
THD+N = 10%
ZSPK = 3Ω + 22µH,
VPVDD = 5.0V 3.7
W
ZSPK = 4Ω + 33µH,
VPVDD = 5.0V 3
ZSPK = 8Ω + 68µH,
VPVDD = 5.0V 1.7
ZSPK = 8Ω + 68µH,
VPVDD = 3.7V 0.9
THD+N = 1%
ZSPK = 3Ω + 22µH,
VPVDD = 5.0V 2.9
ZSPK = 4Ω + 33µH,
VPVDD = 5.0V 2.4
ZSPK = 8Ω +68µH
VPVDD = 5.0V 1.4
ZSPK = 8Ω +68µH
VPVDD = 3.7V 0.75
Total Harmonic Distortion Plus
Noise THD+N fIN = 1kHz
TA = +25°C
ZSPK = 3Ω +22µH,
POUT = 1.6W,
PVDD = 5.0V
0.05
%
ZSPK = 4Ω +33µH,
POUT = 650mW,
PVDD = 3.7V
0.05 0.75
ZSPK = 4Ω +33µH,
POUT = 1.3W,
VPVDD = 5.0V
0.04
ZSPK = 8Ω +68µH,
POUT = 725mW,
PVDD = 5.0V
0.03
Output Noise A-weighted (Note 3) 29 µVRMS
Electrical Characteristics (continued)
MAX98306 Stereo 3.7W Class D Amplifier
www.maximintegrated.com Maxim Integrated
3
(VPVDD = VSHDN = 3.7V, VPGND = 0V, AV = 12dB (GAIN = PVDD), RL = ∞, RL connected between OUT_+ to OUT_-, 20Hz to 22kHz
AC measurement bandwidth, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
Note 2: This device is 100% production tested at TA = +25°C. All temperature limits are guaranteed by design.
Note 3: Amplifier inputs AC-coupled to ground.
Note 4: Specified at room temperature with an 8Ω resistive load in series with a 68µH inductive load.
(VPVDD = VSHDN = 5.0V, VPGND = 0V, AV = 12dB, RL = , RL connected between OUT_+ to OUT_-, 20Hz to 22kHz AC measurement
bandwidth, TA = +25°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Signal-to-Noise Ratio SNR ZSPK = 8Ω +68µH, POUT at 1% THD+N 99 dB
Efficiency ɳ ZSPK = 8Ω +68µH, POUT = 1.4W, f = 1kHz 92 %
Oscillator Frequency fOSC 160 320 540 kHz
Spread-Spectrum Bandwidth 20 kHz
Current Limit TA = +25°C 3 A
Thermal-Shutdown Level +150 °C
Thermal Hysteresis 20 °C
DIGITAL INPUT (SHDN)
Input-Voltage High VIH 1.4 V
Input-Voltage Low VIL 0.4 V
Input Leakage Current TA = +25°C, SHDN = 0 ±1 µA
Electrical Characteristics (continued)
Typical Operating Characteristics
THD+N vs. OUTPUT POWER
MAX98306 toc01
OUTPUT POWER (W)
THD+N (%)
0.750.500.25
0.01
0.1
1
10
100
0.001
0 1.00
VPVDD = 3.7V
ZLOAD = 8 + 68µH
f = 6kHz
f = 1kHz
f = 100kHz
THD+N vs. OUTPUT POWER
MAX98306 toc03
OUTPUT POWER (W)
THD+N (%)
3.02.52.01.51.00.5
0.01
0.1
1
10
100
0.001
0 3.5
VPVDD = 5V
ZLOAD = 4 + 33µH
f = 6kHz
f = 1kHz f = 100kHz
THD+N vs. OUTPUT POWER
MAX98306 toc02
OUTPUT POWER (W)
THD+N (%)
1.751.501.251.000.750.500.25
0.01
0.1
1
10
100
0.001
0 2.00
VPVDD = 5V
ZLOAD = 8 + 68µH
f = 6kHz
f = 1kHz
f = 100kHz
MAX98306 Stereo 3.7W Class D Amplifier
www.maximintegrated.com Maxim Integrated
4
(VPVDD = VSHDN = 5.0V, VPGND = 0V, AV = 12dB, RL = , RL connected between OUT_+ to OUT_-, 20Hz to 22kHz AC measurement
bandwidth, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
THD+N vs. OUTPUT POWER
MAX98306 toc04
OUTPUT POWER (W)
THD+N (%)
3.02.52.01.51.00.5
0.01
0.1
1
10
100
0.001
0 4.03.5
VPVDD = 5V
ZLOAD = 3 + 22µH
f = 6kHz
f = 1kHz f = 100kHz
THD+N vs. FREQUENCY
MAX98306 toc06
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
10
0.001
10 100k
VPVDD = 5V
ZLOAD = 8 + 68µH
1.3W
200mW
THD+N vs. FREQUENCY
MAX98306 toc05
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
10
0.001
10 100k
VPVDD = 3.7V
ZLOAD = 8 + 68µH
700mW
200mW
THD+N vs. FREQUENCY
MAX98306 toc07
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
10
0.001
10 100k
VPVDD = 5V
ZLOAD = 4 + 33µH
2W
200mW
OUTPUT POWER vs. LOAD RESISTANCE
MAX98306 toc09
RLOAD ()
OUTPUT POWER (W)
10010
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0
1 1000
VPVDD = 3.7V
f = 1kHz
THD+N = 10%
THD+N = 1%
THD+N vs. FREQUENCY
MAX98306 toc08
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
10
0.001
10 100k
VPVDD = 5V
ZLOAD = 3 + 22µH
2.5W
500mW
OUTPUT POWER vs. LOAD RESISTANCE
MAX98306 toc10
RLOAD ()
OUTPUT POWER (W)
10010
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0
1 1000
VPVDD = 5V
f = 1kHz
THD+N = 10%
THD+N = 1%
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX98306 toc12
OUTPUT POWER (W)
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0
SUPPLY VOLTAGE (V)
5.04.54.03.53.02.5 5.5
THD+N = 1%
THD+N = 10%
f = 1kHz
ZLOAD = 4 + 33µH
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX98306 toc11
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
5.04.54.03.53.0
0.5
1.0
1.5
2.0
2.5
0
2.5 5.5
f = 1kHz
ZLOAD = 8 + 68µH
THD+N = 10%
THD+N = 1%
MAX98306 Stereo 3.7W Class D Amplifier
Maxim Integrated
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U“
(VPVDD = VSHDN = 5.0V, VPGND = 0V, AV = 12dB, RL = , RL connected between OUT_+ to OUT_-, 20Hz to 22kHz AC measurement
bandwidth, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX98306 toc13
OUTPUT POWER (W)
4.5
5.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0
SUPPLY VOLTAGE (V)
5.04.54.03.53.02.5 5.5
THD+N = 1%
THD+N = 10%
f = 1kHz
ZLOAD = 3 + 22µH
EFFICIENCY vs. OUTPUT POWER
MAX98306 toc15
OUTPUT POWER (W)
EFFICIENCY (%)
1.51.00.5
10
20
30
40
50
60
70
80
90
100
0
0 2.0
ZLOAD = 8 + 68µH
ZLOAD = 4 + 33µH
ZLOAD = 3 + 22µH
VPVDD = 3.7V
GAIN vs. FREQUENCY
MAX98306 toc14
FREQUENCY (Hz)
AMPLITUDE (dB)
10k1k100
-30
-20
-10
0
10
20
30
-40
10 100k
EFFICIENCY vs. OUTPUT POWER
MAX98306 toc16
OUTPUT POWER (W)
3.5
3.02.0 2.51.0 1.50.50 4.0
EFFICIENCY (%)
10
20
30
40
50
60
70
80
90
100
0
ZLOAD = 8 + 68µH
ZLOAD = 4 + 33µH
ZLOAD = 3 + 22µH
VPVDD = 5.0V
CROSSTALK vs. FREQUENCY
MAX98306 toc18
FREQUENCY (Hz)
CROSSTALK (dB)
10k1k100
-120
-100
-80
-60
-40
-20
0
-140
10 100k
RIGHT TO LEFT
LEFT TO RIGHT
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX98306 toc17
SUPPLY CURRENT (mA)
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0
SUPPLY VOLTAGE (V)
5.04.54.03.53.02.5 5.5
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
MAX98306 toc19
CMRR (dB)
10
20
30
40
50
60
70
80
90
100
0
FREQUENCY (Hz)
10k1k10010 100k
VPVDD = 3.7V
WIDEBAND vs. FREQUENCY
MAX98306 toc21
FREQUENCY (MHz)
AMPLITUDE (dBV)
101
-80
-60
-40
-20
0
20
-100
0.1 100
POWER-SUPPLY REJECTION
RATIO vs. FREQUENCY
MAX98306 toc20
PSRR (dB)
10
20
30
40
50
60
70
80
90
100
0
FREQUENCY (Hz)
10k1k10010 100k
VRIPPLE = 200mVP-P
VPVDD = 3.7V
ZLOAD = 8 + 68µH
MAX98306 Stereo 3.7W Class D Amplifier
Maxim Integrated
6
www.maximintegrated.com
SHDN SHDN
(VPVDD = VSHDN = 5.0V, VPGND = 0V, AV = 12dB, RL = , RL connected between OUT_+ to OUT_-, 20Hz to 22kHz AC measurement
bandwidth, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
IN-BAND vs. FREQUENCY
MAX98306 toc22
FREQUENCY (Hz)
AMPLITUDE (dB)
10k1k100
-120
-100
-80
-60
-40
-20
0
-140
10 100k
SHUTDOWN RESPONSE
MAX98306 toc24
TIME (1ms/div)
SHDN
2V/div
OUTL
OUTR
STARTUP RESPONSE
MAX98306 toc23
TIME (1ms/div)
SHDN
2V/div
OUTL
OUTR
MAX98306 Stereo 3.7W Class D Amplifier
Maxim Integrated
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22$
PIN NAME FUNCTION
1, 8 PGND Ground
2SHDN Active-Low Shutdown Input. Drive SHDN to PGND to place the device into shutdown.
Drive SHDN above 1.4V for normal operation.
3 INL+ Noninverting Audio Left Input
4 INL- Inverting Audio Left Input
5 GAIN Gain Select
6INR- Inverting Audio Right Input
7INR+ Noninverting Audio Right Input
9OUTR- Negative Right Speaker Output
10 OUTR+ Positive Right Speaker Output
11, 12 PVDD Power Supply. Bypass PVDD to PGND with a 0.1µF capacitor in parallel with a 10µF capacitor
placed as close as possible to the device.
13 OUTL+ Positive Left Speaker Output
14 OUTL- Negative Left Speaker Output
EP Exposed Pad. Connect the exposed pad directly to ground.
Pin Description
Pin Configuration
MAX98306
TDFN
TOP VIEW
2 4 5
13 11 10
OUTL+
PVDD
OUTR+
SHDN
INL-
GAIN
1
+
14
OUTL-PGND
3
12
PVDDINL+
6
9
OUTR-INR-
7
8
PGND
EP
INR+
MAX98306 Stereo 3.7W Class D Amplifier
www.maximintegrated.com Maxim Integrated
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Detailed Description
The MAX98306 features low quiescent current, a low-
power shutdown mode, comprehensive click-and-pop
suppression, and excellent RF immunity.
The IC offers Class AB audio performance with Class D
efficiency in a minimal board-space solution.
The Class D amplifier features spread-spectrum modula-
tion, active emissions limiting, edge-rate, and overshoot
control circuitry that offers significant improvements to
switch-mode amplifier radiated emissions.
The amplifier also features click-and-pop suppression that
reduces audible transients on startup and shutdown, as
well as thermal-overload and short-circuit protection.
Class D Speaker Amplifier
The filterless Class D amplifier output stage offers much
higher efficiency than Class AB amplifiers. The high
efficiency of a Class D amplifier is due to the pulse-width
modulated (PWM) rail-to-rail switching operation of the
output stage transistors. This ensures that any power loss
associated with the Class D output stage is mostly due to
the I2R loss of the MOSFET on-resistance and quiescent
current overhead.
EMI Filterless Output Stage
Traditional Class D amplifiers require the use of external
LC filters, or shielding, to meet EN55022B electromag-
netic-interference (EMI) regulation standards. Maxim’s
active-emissions-limiting edge-rate control circuitry and
spread-spectrum modulation reduce EMI emissions,
while maintaining up to 92% efficiency.
Spread-spectrum modulation and active emissions limit-
ing limit wideband spectral components, while proprietary
techniques ensure that the cycle-to-cycle variation of the
switching period does not degrade audio reproduction or
efficiency. The IC’s spread-spectrum modulator randomly
varies the switching frequency by ±20kHz around the
center frequency (320kHz). Above 10MHz, the wideband
spectrum looks like noise for EMI purposes (Figure 1).
Speaker Current Limit
If the output current of the speaker amplifier exceeds
the current limit (3A typ), the IC disables the outputs for
approximately 100µs. At the end of 100µs, the outputs
are reenabled. If the fault condition still exists, the IC con-
tinues to disable and reenable the outputs until the fault
condition is removed.
Selectable Gain
The IC offers five programmable gains selected using the
GAIN input.
Shutdown
The IC features a low-power shutdown mode, drawing
1µA (typ) of supply current. Drive SHDN low to place
the MAX98306 into shutdown. Drive SHDN above 1.4V
for normal operation.
Click-and-Pop Suppression
The IC speaker amplifier features Maxim’s compre-
hensive click-and-pop suppression. During startup, the
click-and-pop suppression circuitry reduces any audible
transient sources internal to the device. When entering
shutdown, the differential speaker outputs ramp down to
PGND quickly and simultaneously.
Table 1. Gain Control Configuration
Figure 1. EMI with 12in of Speaker Cable and No Output Filter
GAIN PIN MAXIMUM GAIN (dB)
Connect to PGND 18
Connect to PGND through
100kΩ ±5% resistor 15
Connect to PVDD 12
Connect to PVDD through
100kΩ ±5% resistor 9
Unconnected 6
FREQUENCY (MHz)
EMISSIONS LEVEL (dBµV/m)
900800600 700200 300 400 500100
0
10
20
30
40
50
60
70
80
90
-10
0 1000
MAX98306 Stereo 3.7W Class D Amplifier
www.maximintegrated.com Maxim Integrated
9
Applications Information
Filterless Class D Operation
Traditional Class D amplifiers require an output filter.
The filter adds cost and size and decreases THD perfor-
mance. The IC’s filterless modulation scheme does not
require an output filter.
Because the switching frequency of the IC is well beyond
the bandwidth of most speakers, voice coil movement due
to the switching frequency is very small. Use a speaker
with a series inductance > 10µH. Typical 8Ω speakers
exhibit series inductances in the 20µH to 100µH range.
Component Selection
Power-Supply Input (PVDD)
PVDD powers the speaker amplifier. PVDD ranges from
2.6V to 5.5V. Bypass PVDD with 0.1µF and 10µF capaci-
tors to PGND. Apply additional bulk capacitance at the
device if long input traces between PVDD and the power
source are used.
Input Filtering
The input-coupling capacitor (CIN), in conjunction with
the amplifier’s internal input resistance (RIN), forms a
highpass filter that removes the DC bias from the incom-
ing signal. These capacitors allow the amplifier to bias the
signal to an optimum DC level.
Assuming zero source impedance, CIN is:
IN
3dB IN
1
C2f R
=
π×
where f-3dB is the -3dB corner frequency and RIN is the
typical value as specified in the Electrical Characteristics
table. Use capacitors with adequately low-voltage coef-
ficients for best low-frequency THD performance. Table
2 shows calculated capacitance values based on a 20Hz
highpass filter.
Layout and Grounding
Proper layout and grounding are essential for optimum
performance. Good grounding improves audio perfor-
mance and prevents switching noise from coupling into
the audio signal.
Use wide, low-resistance output traces. As the load
impedance decreases, the current drawn from the device
increases. At higher current, the resistance of the output
traces decrease the power delivered to the load. For
example, if 2W is delivered from the device output to a
4Ω load through 100mΩ of total speaker trace, 1.904W
is delivered to the speaker. If power is delivered through
10mΩ of total speaker trace, 1.99W is delivered to the
speaker. Wide output, supply, and ground traces also
improve the power dissipation of the device.
The IC is inherently designed for excellent RF immunity.
For best performance, add ground fills around all signal
traces on top or bottom PCB planes.
Table 2. Capacitance Value for 20Hz
Highpass Filter
GAIN RIN (kΩ) CIN for 20Hz (nF)
18 33 241
15 46 173
12 65 122
9 93 86
6 131 61
Chip Information
PROCESS: CMOS
MAX98306 Stereo 3.7W Class D Amplifier
www.maximintegrated.com Maxim Integrated
10
“HW 1 m ££ ££ WE
GAIN
INR+ 7
INR-
PGND
1, 8
6
5
MAX98306
1ST INTEGRATOR 2ND INTEGRATOR
1ST INTEGRATOR 2ND INTEGRATOR
GAIN
CONTROL
SHDN 2 CLICK-AND-POP
SUPPRESSION
MODULATOR
(FIXED GAIN 2x)
GAIN SELECTION
GAIN SELECTION
INL+ 3
INL- 4
14
13
MODULATOR
(FIXED GAIN 2x)
UVLO/POWER
MANAGEMENT
PVDD
2.6V TO 5.5V
0.1µF 10µF
11, 12
OUTL+
OUTL-
PVDD
LOW-EMI
DRIVER
PVDD
PGND
LOW-EMI
DRIVER
PVDD
PGND
9
10 OUTR+
OUTR-
LOW-EMI
DRIVER
PVDD
PGND
LOW-EMI
DRIVER
PVDD
PGND
PVDD
Block Diagram
MAX98306 Stereo 3.7W Class D Amplifier
www.maximintegrated.com Maxim Integrated
11
PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND
PATTERN NO.
14 TDFN T1433+2 21-0137 90-0063
Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
MAX98306 Stereo 3.7W Class D Amplifier
www.maximintegrated.com Maxim Integrated
12
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 6/11 Initial release
1 8/11 Updated output power in Electrical Characteristics 3
2 12/17 Removed package outline drawings 12, 13
Revision History
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
MAX98306 Stereo 3.7W Class D Amplifier
© 2018 Maxim Integrated Products, Inc.
13
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

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