_______________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX98306
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
Features
S Output Power 3.7W at 3I, 10% THD, 1.7W at 8I,
10% THD, with 5V Supply
S Passes EMI Limit Unfiltered with Up to 12in of
Speaker Cable
S High 83dB PSRR at 217Hz
S 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+
GAIN GAIN
CONTROL
1µF
1µF
1µF
1µF
PVDD
PVDD
PGND
SHDN
MAX98306
0.1µF 10µF
+2.6V TO +5.5V
PVDD
PART TEMP RANGE PIN-
PACKAGE
TOP
MARK
MAX98306ETD+ -40NC to +85NC14 TDFN +AEV
2 ______________________________________________________________________________________
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 www.maxim-ic.com/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)
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 = +25NC < 1 10 FA
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 = 100kI to PGND 14.5 15 15.5
GAIN = PVDD 11.5 12 12.5
GAIN = 100kI 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
kI
AV = 15Db (GAIN = 100kI to PGND) 31 46
AV = 12dB (GAIN = PVDD) 44 65
AV = 9dB (GAIN = 100kI 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 = +25NC (Note 3) ±1±3 mV
_______________________________________________________________________________________ 3
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)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Click-and-Pop Level KCP
Peak voltage, TA = +25NC
A-weighted, 32 samples
per second (Notes 3, 4)
Into shutdown -79
dBV
Out of shutdown -73
Power-Supply Rejection Ratio PSRR TA = +25NC
(Note 3)
VPVDD = 2.6V to 5.5V,
TA = +25NC70 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 = 3I + 22FH,
VPVDD = 5.0V 3.7
W
ZSPK = 4I + 33FH,
VPVDD = 5.0V 3
ZSPK = 8I + 68FH,
VPVDD = 5.0V 1.7
ZSPK = 8I + 68FH,
VPVDD = 3.7V 0.9
THD+N = 1%
ZSPK = 3I + 22FH,
VPVDD = 5.0V 2.9
ZSPK = 4I + 33FH,
VPVDD = 5.0V 2.4
ZSPK = 8I +68FH
VPVDD = 5.0V 1.4
ZSPK = 8I +68FH
VPVDD = 3.7V 0.75
Total Harmonic Distortion Plus
Noise THD+N fIN = 1kHz
TA = +25NC
ZSPK = 3I +22FH,
POUT = 1.6W,
PVDD = 5.0V
0.05
%
ZSPK = 4I +33FH,
POUT = 650mW,
PVDD = 3.7V
0.05 0.75
ZSPK = 4I +33FH,
POUT = 1.3W,
VPVDD = 5.0V
0.04
ZSPK = 8I +68FH,
POUT = 725mW,
PVDD = 5.0V
0.03
Output Noise A-weighted (Note 3) 29 FVRMS
4 ______________________________________________________________________________________
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 (%)
0.750.500.25
0.01
0.1
1
10
100
0.001
0 1.00
VPVDD = 3.7V
ZLOAD = 8I + 68µH
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 = 8I + 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 = 4I + 33µH
f = 6kHz
f = 1kHz f = 100kHz
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Signal-to-Noise Ratio SNR ZSPK = 8I +68FH, POUT at 1% THD+N 99 dB
Efficiency EZSPK = 8I +68FH, POUT = 1.4W, f = 1kHz 92 %
Oscillator Frequency fOSC 160 320 540 kHz
Spread-Spectrum Bandwidth 20 kHz
Current Limit TA = +25NC 3 A
Thermal-Shutdown Level +150 NC
Thermal Hysteresis 20 NC
DIGITAL INPUT (SHDN)
Input-Voltage High VIH 1.4 V
Input-Voltage Low VIL 0.4 V
Input Leakage Current TA = +25NC, SHDN = 0 ±1FA
_______________________________________________________________________________________ 5
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 (%)
3.02.52.01.51.00.5
0.01
0.1
1
10
100
0.001
0 4.03.5
VPVDD = 5V
ZLOAD = 3I + 22µH
f = 6kHz
f = 1kHz f = 100kHz
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 = 8I + 68µH
700mW
200mW
THD+N vs. FREQUENCY
MAX98306 toc06
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
10
0.001
10 100k
VPVDD = 5V
ZLOAD = 8I + 68µH
1.3W
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 = 4I + 33µH
2W
200mW
THD+N vs. FREQUENCY
MAX98306 toc08
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
10
0.001
10 100k
VPVDD = 5V
ZLOAD = 3I + 22µH
2.5W
500mW
OUTPUT POWER vs. LOAD RESISTANCE
MAX98306 toc09
RLOAD (I)
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%
OUTPUT POWER vs. LOAD RESISTANCE
MAX98306 toc10
RLOAD (I)
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 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 = 8I + 68µH
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 = 4I + 33µH
6 ______________________________________________________________________________________
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)
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 = 3I + 22µH
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 toc15
OUTPUT POWER (W)
EFFICIENCY (%)
1.51.00.5
10
20
30
40
50
60
70
80
90
100
0
0 2.0
ZLOAD = 8I + 68µH
ZLOAD = 4I + 33µH
ZLOAD = 3I + 22µH
VPVDD = 3.7V
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 = 8I + 68µH
ZLOAD = 4I + 33µH
ZLOAD = 3I + 22µH
VPVDD = 5.0V
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
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
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
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 = 8I + 68µH
WIDEBAND vs. FREQUENCY
MAX98306 toc21
FREQUENCY (MHz)
AMPLITUDE (dBV)
101
-80
-60
-40
-20
0
20
-100
0.1 100
_______________________________________________________________________________________ 7
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
-120
-100
-80
-60
-40
-20
0
-140
10 100k
STARTUP RESPONSE
MAX98306 toc23
TIME (1ms/div)
SHDN
2V/div
OUTL
OUTR
SHUTDOWN RESPONSE
MAX98306 toc24
TIME (1ms/div)
SHDN
2V/div
OUTL
OUTR
8 ______________________________________________________________________________________
MAX98306
Stereo 3.7W Class D Amplifier
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+
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
6 INR- Inverting Audio Right Input
7 INR+ Noninverting Audio Right Input
9 OUTR- Negative Right Speaker Output
10 OUTR+ Positive Right Speaker Output
11, 12 PVDD Power Supply. Bypass PVDD to PGND with a 0.1FF capacitor in parallel with a 10FF 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.
_______________________________________________________________________________________ 9
MAX98306
Stereo 3.7W Class D Amplifier
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 shut-
down, 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 effi-
ciency 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 propri-
etary techniques ensure that the cycle-to-cycle varia-
tion of the switching period does not degrade audio
reproduction or efficiency. The IC’s spread-spectrum
modulator randomly varies the switching frequency by
Q20kHz 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 100Fs. At the end of 100Fs, the outputs
are reenabled. If the fault condition still exists, the IC
continues 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
P 1FA (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 comprehen-
sive 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
100kI ±5% resistor 15
Connect to PVDD 12
Connect to PVDD through
100kI ±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
10 _____________________________________________________________________________________
MAX98306
Stereo 3.7W Class D Amplifier
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 > 10FH. Typical
8I speakers exhibit series inductances in the 20FH to
100FH range.
Component Selection
Power-Supply Input (PVDD)
PVDD powers the speaker amplifier. PVDD ranges from
2.6V to 5.5V. Bypass PVDD with 0.1FF and 10FF 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:
−
=
π ×
IN 3dB IN
1
C2 f R
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 coeffi-
cients 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 4I load through 100mI of total speaker trace, 1.904W
is delivered to the speaker. If power is delivered through
10mI 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.
Chip Information
PROCESS: CMOS
Table 2. Capacitance Value for 20Hz
Highpass Filter
GAIN RIN (kI)CIN for 20Hz (nF)
18 33 241
15 46 173
12 65 122
9 93 86
6 131 61
______________________________________________________________________________________ 11
MAX98306
Stereo 3.7W Class D Amplifier
Block Diagram
GAIN
INR+ 7
INR-
PGND
1, 8
6
5MAX98306
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
12 _____________________________________________________________________________________
MAX98306
Stereo 3.7W Class D Amplifier
Package Information
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.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.
PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND
PATTERN NO.
14 TDFN T1433+2 21-0137 90-0063
COMMON DIMENSIONS
SYMBOL MIN. MAX.
A 0.70 0.80
D 2.90 3.10
E 2.90 3.10
A1 0.00 0.05
L 0.20 0.40
PKG. CODE N D2 E2 e JEDEC SPEC b[(N/2)-1] x e
PACKAGE VARIATIONS
0.25 MIN.k
A2 0.20 REF.
2.00 REF0.25±0.05
0.50 BSC
2.30±0.1010
T1033-1
2.40 REF0.20±0.05- - - -
0.40 BSC
1.70±0.10 2.30±0.1014
T1433-1
1.50±0.10 MO229 / WEED-3
0.40 BSC - - - - 0.20±0.05 2.40 REFT1433-2 14 2.30±0.101.70±0.10
T633-2 6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF
T833-2 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF
T833-3 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF
2.30±0.10 MO229 / WEED-3 2.00 REF0.25±0.050.50 BSC1.50±0.1010
T1033-2
0.25±0.05 2.00 REF10 0.50 BSC MO229 / WEED-3
2.30±0.101.50±0.10
T1033MK-1
0.40 BSC - - - - 0.20±0.05 2.40 REFT1433-3F 14 2.30±0.101.70±0.10
______________________________________________________________________________________ 13
MAX98306
Stereo 3.7W Class D Amplifier
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.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.
COMMON DIMENSIONS
SYMBOL MIN. MAX.
A 0.70 0.80
D 2.90 3.10
E 2.90 3.10
A1 0.00 0.05
L 0.20 0.40
PKG. CODE N D2 E2 e JEDEC SPEC b[(N/2)-1] x e
PACKAGE VARIATIONS
0.25 MIN.k
A2 0.20 REF.
2.00 REF0.25±0.05
0.50 BSC
2.30±0.1010
T1033-1
2.40 REF0.20±0.05- - - -
0.40 BSC
1.70±0.10 2.30±0.1014
T1433-1
1.50±0.10 MO229 / WEED-3
0.40 BSC - - - - 0.20±0.05 2.40 REFT1433-2 14 2.30±0.101.70±0.10
T633-2 6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF
T833-2 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF
T833-3 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF
2.30±0.10 MO229 / WEED-3 2.00 REF0.25±0.050.50 BSC1.50±0.1010
T1033-2
0.25±0.05 2.00 REF10 0.50 BSC MO229 / WEED-3
2.30±0.101.50±0.10
T1033MK-1
0.40 BSC - - - - 0.20±0.05 2.40 REFT1433-3F 14 2.30±0.101.70±0.10
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim reserves the right to change the circuitry and specifications without notice at any time.
14 Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2011 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
MAX98306
Stereo 3.7W Class D Amplifier
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 6/11 Initial release —
1 8/11 Updated output power in Electrical Characteristics 3
