Maxim MAX9736BETJ/V Mono/stereo high-power class d amplifier Datasheet

19-3108; Rev 3; 9/09
KIT
ATION
EVALU
E
L
B
AVAILA
Mono/Stereo High-Power Class D Amplifier
The MAX9736A/B/D Class D amplifiers provide highperformance, thermally efficient amplifier solutions. The
MAX9736A delivers 2 x 15W into 8Ω loads, or 1 x 30W
into a 4Ω load. The MAX9736B/D deliver 2 x 6W into 8Ω
loads or 1 x 12W into a 4Ω load.
These devices operate from 8V to 28V and provide a
high PSRR, eliminating the need for a regulated power
supply. The MAX9736 offers up to 88% efficiency at
12V supply.
Pin-selectable modulation schemes select between filterless modulation and classic PWM modulation.
Filterless modulation allows the MAX9736 to pass CE
EMI limits with 1m cables using only a low-cost ferrite
bead and capacitor on each output. Classic PWM modulation is optimized for best audio performance when
using a full LC filter.
A pin-selectable stereo/mono mode allows stereo operation into 8Ω loads or mono operation into 4Ω loads. In
mono mode, the right input op amp becomes available
as a spare device, allowing flexibility in system design.
Comprehensive click-and-pop reduction circuitry minimizes noise coming into and out of shutdown or mute.
Input op amps allow the user to create summing amplifiers,
lowpass or highpass filters, and select an optimal gain.
The MAX9736A/B/D are available in 32-pin TQFN packages and specified over the -40°C to +85°C temperature range.
Features
o Wide 8V to 28V Supply Voltage Range
o Spread-Spectrum Modulation Enables Low EMI
Solution
o Passes CE EMI Limits with Low-Cost Ferrite
Bead/Capacitor Filter
o Low BOM Cost
o High 67dB PSRR at 1kHz Reduces Supply Cost
o 88% Efficiency Eliminates Heatsink
o Thermal and Output Current Protection
o < 1µA Shutdown Mode
o Mute Function
o Space-Saving, 32-Pin TQFN Packages, 7mm x
7mm x 0.8mm (MAX9736A/B), 5mm x 5mm x
0.8mm (MAX9736D)
Applications
LCD/PDP/CRT Monitors
LCD/PDP/CRT TVs
MP3 Docking Stations
Notebook PCs
PC Speakers
All-in-One PCs
Ordering Information
PART
MAX9736AETJ+
STEREO/MONO
OUTPUT POWER
2 x 15W/
1 x 30W
PIN-PACKAGE
32 TQFN-EP*
7mm x 7mm
Note: All devices are specified over the -40°C to +85°C operating temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Ordering Information continued at end of data sheet.
Simplified Diagram
8V TO 28V
8Ω
AUDIO
INPUTS
8Ω
INPUT RESISTORS AND
CAPACITORS SELECT GAIN
AND CUTOFF FREQUENCY
SHDN
MUTE
MONO
MAX9736
________________________________________________________________ Maxim Integrated Products
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.
1
MAX9736
General Description
MAX9736
Mono/Stereo High-Power Class D Amplifier
ABSOLUTE MAXIMUM RATINGS
Continuous Power Dissipation (TA = +70°C)
32-Pin TQFN 5mm x 5mm Multiple Layer PCB
(derate 34.5mW/°C above +70°C) ..................................2.76W
θJA .................................................................................29°C/W
θJC ...................................................................................2°C/W
Continuous Power Dissipation (TA = +70°C)
32-Pin TQFN 7mm x 7mm Multiple Layer PCB
(derate 37mW/°C above +70°C) .....................................2.96W
θJA .................................................................................27°C/W
θJC ...................................................................................1°C/W
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
PVDD to PGND.......................................................-0.3V to +30V
AGND to PGND .....................................................-0.3V to +0.3V
INL, INR, FBL, FBR, COM to AGND .........-0.3V to (VREG + 0.3V)
MUTE, SHDN, MONO, MOD, REGEN to AGND.......-0.3V to +6V
REG to AGND ..............................................-0.3V to (VS + 0.3V)
VS to AGND (Note 1)................................................-0.3V to +6V
OUTL+, OUTL-, OUTR+,
OUTR-, to PGND...................................-0.3V to (PVDD + 0.3V)
C1N to PGND ..........................................-0.3V to (PVDD + 0.3V)
C1P to PGND ...........................(PVDD - 0.3V) to (VBOOT + 0.3V)
BOOT to PGND ..............................(VC1P - 0.3V) to PVDD + 12V
OUTL+, OUTL-, OUTR+, OUTR-,
Short Circuit to PGND or PVDD...............................Continuous
Thermal Limits (Notes 2, 3)
Note 1: VS cannot exceed PVDD + 0.3V. See the Power Sequencing section.
Note 2: Thermal performance of this device is highly dependant on PCB layout. See the Applications Information section for more details.
Note 3: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a 4-layer
board. For detailed information on package thermal considerations, visit www.maxim-ic.com/thermal-tutorial.
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.
ELECTRICAL CHARACTERISTICS
(VPVDD = 20V, VVS = 5V, VAGND = VPGND = 0V, VMOD = VSHDN = VMUTE = 5V, REGEN = MONO = AGND, C1 = 0.1μF, C2 = 1μF,
RIN_ = 20kΩ and RFB_= 20kΩ, RL = ∞, AC measurement bandwidth 22Hz to 22kHz, TA = TMIN to TMAX, unless otherwise noted.
Typical values are at TA = +25°C.) (Notes 4, 5)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
8
28
V
4.5
5.5
V
AMPLIFIER DC CHARACTERISTICS
Speaker Supply Voltage Range
Preamplifier Supply Voltage
Range
Undervoltage Lockout
PVDD
VS
7
IPVDD
RL = ∞, VREGEN = 5V,
VVS = open
TA = TMIN to TMAX
IVS
RL = ∞, VREGEN = 0V,
VVS = 5V
TA = TMIN to TMAX
Shutdown Supply Current
ISHDN
REG Voltage
VREG
COM Voltage
(Notes 1 and 7)
UVLO
Quiescent Supply Current
Preregulator Voltage
Inferred from PSRR test
VS
VSHDN = 0V
TA = +25°C
30
V
45
50
TA = +25°C
14
20
22
IPVDD
1
10
10
IVS
4.2
Internal regulated 5V, VREGEN = 5V
VCOM
2.05
mA
μA
V
4.8
1.9
mA
V
2.2
V
INPUT AMPLIFIER CHARACTERISTICS
Capacitive Drive
CL
Output Swing (Note 6)
Sinking ±1mA
Open-Loop Gain
AVO
Input Offset Voltage
VOS
2
VFB_ = VCOM ±500mV, RFB_= 20kΩ to IN_
30
pF
±2
V
88
dB
±1
mV
_______________________________________________________________________________________
Mono/Stereo High-Power Class D Amplifier
(VPVDD = 20V, VVS = 5V, VAGND = VPGND = 0V, VMOD = VSHDN = VMUTE = 5V, REGEN = MONO = AGND, C1 = 0.1μF, C2 = 1μF,
RIN_ = 20kΩ and RFB_= 20kΩ, RL = ∞, AC measurement bandwidth 22Hz to 22kHz, TA = TMIN to TMAX, unless otherwise noted.
Typical values are at TA = +25°C.) (Notes 4, 5)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Input Amplifier Slew Rate
2.5
V/μs
Input Amplifier Unity-Gain
Bandwidth
3.5
MHz
AMPLIFIER CHARACTERISTICS
Output Amplifier Gain (Note 8)
AV
MAX9736A, MAX9736D
16.5
17
17.5
MAX9736B
13.1
13.6
14.1
3.3
4.6
Output Current Limit
Output Offset
VOS
Power-Supply Rejection Ratio
PSRR
OUT_+ to OUT_-, TA = +25°C
PVDD = 8V to 28V, TA = +25°C
f = 1kHz, 100mVP-P ripple
VPVDD = 12V
MAX9736A Output Power
(THD+N = 1%)
POUT_1%
VPVDD = 18V
VPVDD = 24V
VPVDD = 12V
MAX9736B Output Power
(THD+N = 1%)
POUT_1%
VPVDD = 18V
VPVDD = 24V
VPVDD = 12V
MAX9736A Output Power
(THD+N = 10%)
POUT_10%
VPVDD = 18V
VPVDD = 24V
VPVDD = 12V
MAX9736B Output Power
(THD+N = 10%)
POUT_10%
VPVDD = 18V
VPVDD = 24V
Stereo
±2
65
80
67
RL = 8Ω
RL = 4Ω
13
RL = 4Ω
15.5
Stereo
RL = 8Ω
13.5
Mono
RL = 4Ω
27
Stereo
RL = 8Ω
13.5
Mono
RL = 4Ω
27
RL = 8Ω
6
RL = 4Ω
11
Mono
RL = 4Ω
12
Stereo
RL = 8Ω
6
Mono
RL = 4Ω
12
Stereo
RL = 8Ω
6
Mono
Stereo
RL = 4Ω
12
RL = 8Ω
10
RL = 4Ω
16
Mono
RL = 4Ω
19.5
Stereo
RL = 8Ω
17.5
Mono
RL = 4Ω
35
Stereo
RL = 8Ω
17.5
Mono
RL = 4Ω
35
RL = 8Ω
7.5
RL = 4Ω
14
Mono
RL = 4Ω
15
Stereo
RL = 8Ω
7.5
Mono
RL = 4Ω
15
Stereo
RL = 8Ω
7.5
Mono
RL = 4Ω
15
Stereo
A
±10
mV
dB
8
Mono
Stereo
dB
W
W
W
W
_______________________________________________________________________________________
3
MAX9736
ELECTRICAL CHARACTERISTICS (continued)
MAX9736
Mono/Stereo High-Power Class D Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(VPVDD = 20V, VVS = 5V, VAGND = VPGND = 0V, VMOD = VSHDN = VMUTE = 5V, REGEN = MONO = AGND, C1 = 0.1μF, C2 = 1μF,
RIN_ = 20kΩ and RFB_= 20kΩ, RL = ∞, AC measurement bandwidth 22Hz to 22kHz, TA = TMIN to TMAX, unless otherwise noted.
Typical values are at TA = +25°C.) (Notes 4, 5)
PARAMETER
SYMBOL
CONDITIONS
VPVDD = 12V
MAX9736D Output Power
(Thermally Limited)
VPVDD = 18V
VPVDD = 24V
Total Harmonic Distortion Plus
Noise
Signal-to-Noise Ratio
Noise
THD+N
SNR
VN
Crosstalk
Efficiency
Click-and-Pop Level
η
KCP
Switching Frequency
MIN
TYP
Stereo
RL = 8Ω
Mono
RL = 4Ω
17
Stereo
RL = 8Ω
5.5
Mono
RL = 4Ω
11
Stereo
RL = 8Ω
3.5
Mono
RL = 4Ω
7
0.04
MAX9736B/D, POUT = 2W, f = 1kHz,
PWM modulation mode, RL = 8Ω
0.04
A-weighted
(Note 9)
UNITS
8.5
MAX9736A, POUT = 4W, f = 1kHz,
PWM modulation mode, RL = 8Ω
A-weighted
MAX
W
%
MAX9736A/D,
POUT = 8W, RL = 8Ω
96.5
dB
MAX9736B, POUT = 6W,
RL = 8Ω
97
MAX9736A/D
120
MAX9736B
100
μVRMS
L to R, R to L, POUT = 1W, f = 1kHz, RL = 8Ω
100
dB
POUT = 8W, MAX9736A, PVDD = 12V, RL = 8Ω
88
%
Peak voltage, 32
samples/second,
A-weighted
(Notes 9 and 10)
Into mute
36
Out of mute
36
dBV
270
300
330
kHz
Spread-Spectrum Bandwidth
±4
kHz
Thermal Shutdown Level
160
°C
Thermal Shutdown Hysteresis
Turn-On Time
4
tON
30
°C
110
ms
_______________________________________________________________________________________
Mono/Stereo High-Power Class D Amplifier
(VPVDD = 20V, VVS = 5V, VAGND = VPGND = 0V, VMOD = VSHDN = VMUTE = 5V, REGEN = MONO = AGND, C1 = 0.1μF, C2 = 1μF,
RIN_ = 20kΩ and RFB_= 20kΩ, RL = ∞, AC measurement bandwidth 22Hz to 22kHz, TA = TMIN to TMAX, unless otherwise noted.
Typical values are at TA = +25°C.) (Notes 4, 5)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DIGITAL INTERFACE
Input Voltage High
VINH
Input Voltage Low
VINL
Input Voltage Hysteresis
Input Leakage Current
2
V
0.8
50
V
mV
±10
μA
Note 4: All devices are 100% production tested at +25°C. All temperature limits are guaranteed by design.
Note 5: Stereo mode (MONO = GND) specified with 8Ω resistive load in series with a 68μH inductive load connected across BTL
outputs. Mono mode (MONO = 5V) specified with a 4Ω resistive load in series with a 33μH inductive load connected
across BTL outputs.
Note 6: Output swing is specified with respect to VCOM.
Note 7: For typical applications, an external 5V supply is not required. Therefore, set REGEN = 5V. If thermal performance is a
concern, set REGEN = 0V and provide an external regulated 5V supply.
Note 8: Output amplifier gain is defined as:
⎛ | (VOUT_ + ) − (VOUT _ − ) | ⎞
20 × log ⎜
⎟
| VFB _ |
⎝
⎠
Note 9: Amplifier inputs AC-coupled to GND.
Note 10: Specified at room temperature with an 8Ω resistive load in series with a 68μH inductive load connected across BTL outputs.
Mode transitions controlled by SHDN control pin.
_______________________________________________________________________________________
5
MAX9736
ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics
(MAX9736A, VPVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless
otherwise noted.)
1
0.1
0.1
THD+N (%)
POUT = 5W
THD+N (%)
POUT = 3W
POUT = 3W
0.001
0.001
1k
10k
0.001
10
100k
100
1k
100k
10k
10k
100k
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
VPVDD = 12V,
FIXED FREQUENCY,
8Ω LOAD
0.1
THD+N (%)
THD+N (%)
POUT = 5W
VPVDD = 12V,
SPREAD SPECTRUM,
8Ω LOAD
6kHz
1
6kHz
1kHz
MAX9736 toc06
10
MAX9736 toc05
10
1
THD+N (%)
1k
FREQUENCY (Hz)
VPVDD = 12V,
SPREAD SPECTRUM,
4Ω LOAD
0.1
100
10
FREQUENCY (Hz)
MAX9736 toc04
1
100
POUT = 3W
0.01
0.01
0.01
10
VPVDD = 12V,
FIXED FREQUENCY,
4Ω LOAD
POUT = 5W
POUT = 5W
0.1
THD+N (%)
VPVDD = 12V,
SPREAD SPECTRUM,
8Ω LOAD
MAX9736 toc03
VPVDD = 12V,
FIXED FREQUENCY,
8Ω LOAD
MAX9736 toc02
1
MAX9736 toc01
1
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
1kHz
0.1
POUT = 3W
0.01
0.01
0.01
20Hz
20Hz
0.001
0.001
0.001
10
100
1k
10k
100k
0
1
2
3
4
5
6
7
8
9
0
10
1
2
3
4
5
8
9
OUTPUT POWER (W)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
VPVDD = 18V,
SPREAD SPECTRUM,
8Ω LOAD
VPVDD = 24V,
FIXED FREQUENCY,
8Ω LOAD
1
1
1kHz
0.01
6kHz
1kHz
6kHz
THD+N (%)
0.1
THD+N (%)
6kHz
0.1
20Hz
0.01
0.1
20Hz
0.01
1kHz
20Hz
0.001
0.001
0.001
2
4
6
8
10 12 14 16 18 20
OUTPUT POWER (W)
0
2
4
6
8
10 12 14 16 18 20
OUTPUT POWER (W)
0
4
8
12
OUTPUT POWER (W)
_______________________________________________________________________________________
10
MAX9736 toc09
10
MAX9736 toc08
MAX9736 toc07
10
1
6
7
OUTPUT POWER (W)
VPVDD = 18V,
FIXED FREQUENCY,
8Ω LOAD
0
6
FREQUENCY (Hz)
10
THD+N (%)
MAX9736
Mono/Stereo High-Power Class D Amplifier
16
Mono/Stereo High-Power Class D Amplifier
VPVDD = 12V,
FIXED FREQUENCY,
4Ω LOAD
1
10
VPVDD = 12V,
SPREAD SPECTRUM,
4Ω LOAD
1
1
THD+N (%)
0.1
0.1
20Hz
1kHz 6kHz
0.1
1kHz
20Hz
0.01
20Hz
0.01
0.001
0.01
0.001
2
0
4
6
8
10
12
14
16
18
0.001
0
2
OUTPUT POWER (W)
4
6
8
10
12
14
16
90
8
80
7
EFFICIENCY
6
50
5
40
4
POWER DISSIPATION
3
EFFICIENCY (%)
9
60
30
12
MAX9736 toc14
VPVDD = 12V,
SPREAD SPECTRUM,
8Ω LOAD
70
8
7
EFFICIENCY
60
6
50
5
4
40
POWER DISSIPATION
30
3
20
2
10
1
10
1
0
0
5
10
15
20
6
8
10 12 14 16 18 20
EFFICIENCY
vs. TOTAL OUTPUT POWER
70
10
100
9
90
8
80
7
EFFICIENCY
60
50
4
EFFICIENCY
vs. TOTAL OUTPUT POWER
6
5
POWER DISSIPATION
40
4
30
3
20
EFFICIENCY (%)
80
2
TOTAL OUTPUT POWER (W)
VPVDD = 18V,
SPREAD SPECTRUM,
8Ω LOAD
90
0
0
TOTAL OUTPUT POWER (W)
MAX9736 toc15
100
MAX9736 toc16
VPVDD = 18V,
FIXED FREQUENCY,
8Ω LOAD
70
10
9
8
7
EFFICIENCY
60
6
50
5
POWER DISSIPATION
40
4
30
3
2
20
2
10
1
10
1
0
0
0
0
5
10
15
20
25
TOTAL OUTPUT POWER (W)
30
18
9
2
0
15
10
20
0
EFFICIENCY (%)
100
POWER DISSIPATION (W)
EFFICIENCY (%)
70
10
POWER DISSIPATION (W)
MAX9736 toc13
80
9
EFFICIENCY
vs. TOTAL OUTPUT POWER
VPVDD = 12V,
FIXED FREQUENCY,
8Ω LOAD
90
6
OUTPUT POWER (W)
EFFICIENCY
vs. TOTAL OUTPUT POWER
100
3
0
OUTPUT POWER (W)
35
POWER DISSIPATION (W)
1kHz
THD+N (%)
6kHz
6kHz
POWER DISSIPATION (W)
VPVDD = 24V,
SPREAD SPECTRUM,
8Ω LOAD
MAX9736 toc11
10
MAX9736 toc10
10
THD+N (%)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9736 toc12
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
0
0
5
10
15
20
25
30
35
TOTAL OUTPUT POWER (W)
_______________________________________________________________________________________
7
MAX9736
Typical Operating Characteristics (continued)
(MAX9736A, VPVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless
otherwise noted.)
Typical Operating Characteristics (continued)
(MAX9736A, VPVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless
otherwise noted.)
EFFICIENCY
vs. TOTAL OUTPUT POWER
60
80
6
POWER DISSIPATION
5
7
60
6
EFFICIENCY
50
5
40
4
3
20
2
20
2
10
1
10
1
0
0
0
5
10
15
20
25
30
30
0
0
5
10
15
20
25
TOTAL OUTPUT POWER (W)
EFFICIENCY
vs. TOTAL OUTPUT POWER
EFFICIENCY
vs. TOTAL OUTPUT POWER
10
100
9
90
8
80
7
6
EFFICIENCY
50
5
POWER DISSIPATION
40
4
4
30
10
1
10
0
0
0
3
POWER DISSIPATION
0
0
20
5
12
10
8
10% THD+N
6
4
5
2
1% THD+N
20
SUPPLY VOLTAGE (V)
25
30
25
20
10% THD+N
15
10
5
0
15
30
30
10
0
25
16
OUTPUT POWER (W)
15
20
TOTAL OUTPUT POWER vs. LOAD RESISTANCE
VDD = 18V, f = 1kHz, SPREAD SPECTRUM
14
OUTPUT POWER (W)
1% THD+N
20
15
TOTAL OUTPUT POWER vs. LOAD RESISTANCE
VDD = 12V, f = 1kHz, SPREAD SPECTRUM
MAX9736 toc22
MAX9736 toc21
25
10
TOTAL OUTPUT POWER (W)
TOTAL OUTPUT POWER vs. VDD
LOAD = 8Ω, f = 1kHz
30
2
1
TOTAL OUTPUT POWER (W)
10% THD+N
6
EFFICIENCY
5
20
40
8
40
2
15
9
50
3
10
10
7
60
20
5
MAX9736 toc20
VPVDD = 12V,
SPREAD SPECTRUM,
4Ω LOAD
70
30
0
30
MAX9736 toc23
60
EFFICIENCY (%)
MAX9736 toc19
70
10
3
POWER DISSIPATION
TOTAL OUTPUT POWER (W)
VPVDD = 12V,
FIXED FREQUENCY,
4Ω LOAD
80
8
8
70
30
90
5
9
4
100
35
10
40
0
EFFICIENCY (%)
8
7
EFFICIENCY
50
90
VPVDD = 24V,
SPREAD SPECTRUM,
8Ω LOAD
POWER DISSIPATION (W)
70
9
POWER DISSIPATION (W)
EFFICIENCY (%)
80
MAX9736 toc18
100
POWER DISSIPATION (W)
90
10
EFFICIENCY (%)
VPVDD = 24V,
FIXED FREQUENCY,
8Ω LOAD
EFFICIENCY
vs. TOTAL OUTPUT POWER
POWER DISSIPATION (W)
MAX9736 toc17
100
OUTPUT POWER (W)
MAX9736
Mono/Stereo High-Power Class D Amplifier
1% THD+N
0
5
10
15
20
LOAD RESISTANCE (Ω)
25
30
5
10
15
20
LOAD RESISTANCE (Ω)
_______________________________________________________________________________________
25
30
Mono/Stereo High-Power Class D Amplifier
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
-20
30
15
CROSSTALK (dB)
10% THD+N
-40
-50
-60
10
0
-90
15
20
25
30
LEFT TO RIGHT
-120
10
100
LOAD RESISTANCE (Ω)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
10
0.1
20Hz
2
4
6
8
10 12 14 16 18 20
-40
-60
-80
-40
-60
-80
-120
0
5
10
0.1
20
15
1
WIDEBAND OUTPUT SPECTRUM
SHDN ON-/OFF-RESPONSE
MUTE ON-/OFF-RESPONSE
MAX9736 toc32
-10
MAX9736 toc30
MAX9736 toc31
8Ω LOAD,
SPREAD SPECTRUM
100
10
FREQUENCY (MHz)
FREQUENCY (kHz)
0
OUTPUT AMPLITUDE (dBV)
-20
-100
OUTPUT POWER (W)
10
100k
8Ω LOAD,
FIXED FREQUENCY
0
-120
0
10k
WIDEBAND OUTPUT SPECTRUM
-100
0.001
1k
20
OUTPUT AMPLITUDE (dBV)
6kHz
100
FREQUENCY (Hz)
8Ω LOAD,
SPREAD SPECTRUM
-20
OUTPUT AMPLITUDE (dBV)
1
THD+N (%)
100k
0
MAX9736 toc08
VPVDD = 18V,
SPREAD SPECTRUM,
8Ω LOAD
0.01
10k
INBAND OUTPUT SPECTRUM
10
1kHz
1k
FREQUENCY (Hz)
MAX9736 toc28
10
RIGHT TO LEFT
-80
-100
-80
5
-60
-70
1% THD+N
5
0
-40
MAX9736 toc29
20
1W OUTPUT,
8Ω LOAD,
SPREAD SPECTRUM
-20
-30
25
PSRR (dB)
TOTAL OUTPUT POWER (W)
100mVP-P,
PVDD RIPPLE,
8Ω LOAD
-10
0
MAX9736 toc25
VPVDD = 24V,
SPREAD SPECTRUM
35
CROSSTALK vs. FREQUENCY
0
MAX9736 toc24
40
MAX9736 toc26
TOTAL OUTPUT POWER
vs. LOAD RESISTANCE
MAX9736
Typical Operating Characteristics (continued)
(MAX9736A, VPVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless
otherwise noted.)
SHDN
2V/div
MUTE
2V/div
OUTPUT
5V/div
OUTPUT
5V/div
-20
-30
-40
-50
-60
-70
-80
-90
-100
0.1
1
10
100
40ms/div
40ms/div
FREQUENCY (MHz)
_______________________________________________________________________________________
9
Typical Operating Characteristics (continued)
(MAX9736A, VPVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless
otherwise noted.)
SUPPLY CURRENT
vs. PVDD SUPPLY VOLTAGE
20
10
MAX9736 toc34
15
15
VREGEN = 0V,
VMUTE = VSHDN = 3.3V
13
10
11
9
5
0
7
5
0
13
18
8
28
23
13
18
23
4.5
28
4.7
4.9
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
SHUTDOWN CURRENT
vs. PVDD SUPPLY VOLTAGE
1
MAX9736 toc36
3
VREGEN = VSHDN = 0V,
VMUTE = 3.3V
2
VPVDD = 12V,
FIXED FREQUENCY,
4Ω LOAD, MONO
POUT = 10W
1
VPVDD = 12V,
SPREAD SPECTRUM,
4Ω LOAD, MONO
5.5
POUT = 10W
THD+N (%)
0.1
THD+N (%)
0
5.3
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
0.1
1
5.1
VS VOLTAGE (V)
MAX9736 toc37
8
MAX9736 toc38
SUPPLY CURRENT (mA)
30
VREGEN = 0V,
VMUTE = VSHDN = 3.3V,
VS = 5V
SUPPLY CURRENT (mA)
VREGEN = VMUTE = VSHDN = 3.3V
SUPPLY CURRENT (mA)
20
MAX9736 toc33
40
SUPPLY CURRENT
vs. VS SUPPLY VOLTAGE
MAX9736 toc35
SUPPLY CURRENT
vs. PVDD SUPPLY VOLTAGE
SHUTDOWN CURRENT (μA)
POUT = 6W
0.01
POUT = 6W
0.01
-1
0.001
-2
12
16
20
0.001
10
28
24
100
1k
10k
100k
10
FREQUENCY (Hz)
SUPPLY VOLTAGE (V)
10
MAX9736 toc39
VPVDD = 12V,
FIXED FREQUENCY,
4Ω LOAD, MONO
1
1
6kHz
THD+N (%)
6kHz
0.1
1kHz
0.1
1kHz
20Hz
0.01
20Hz
0.01
0
2
4
6
8
10 12 14 16 18 20
OUTPUT POWER (W)
10
1k
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (VDD = 12V,
SPREAD SPECTRUM, 4Ω LOAD, MONO)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
10
100
MAX9736 toc40
8
THD+N (%)
MAX9736
Mono/Stereo High-Power Class D Amplifier
0
2
4
6
8
10 12 14 16 18 20
OUTPUT POWER (W)
______________________________________________________________________________________
10k
100k
Mono/Stereo High-Power Class D Amplifier
VPVDD = 18V,
FIXED FREQUENCY,
4Ω LOAD, MONO
VPVDD = 18V,
SPREAD SPECTRUM,
4Ω LOAD, MONO
10
1
0.1
THD+N (%)
6kHz
6kHz
1kHz
0.1
1kHz
10
15
20
25
30
1kHz
20Hz
20Hz
0.01
5
6kHz
0.1
20Hz
0.01
0
VPVDD = 24V,
FIXED FREQUENCY,
4Ω LOAD, MONO
1
THD+N (%)
THD+N (%)
1
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
35
0.01
0
OUTPUT POWER (W)
5
10
15
20
25
30
35
0
5
OUTPUT POWER (W)
0.1
25
30
35
MAX9736 toc45
80
EFFICIENCY (%)
6kHz
1kHz
20
90
70
1
15
EFFICIENCY
vs. OUTPUT POWER
MAX9736 toc44
10
10
OUTPUT POWER (W)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (VDD = 24V,
SPREAD SPECTRUM, 4Ω LOAD, MONO)
THD+N (%)
MAX9736 toc43
10
MAX9736 toc41
VPVDD = 12V
60
VPVDD = 18V
50
40
VPVDD = 24V
30
20
20Hz
4Ω LOAD, MONO,
1kHz FIXED FREQUENCY
10
0.01
0
0
6
12
18
24
30
36
0
5
OUTPUT POWER (W)
80
70
VPVDD = 12V
VPVDD = 18V
40
VPVDD = 24V
30
10% THD+N
35
OUTPUT POWER (W)
90
EFFICIENCY (%)
40
MAX9736 toc46
100
50
15
20
OUTPUT POWER vs. VDD
(LOAD = 4Ω, f = 1kHz, SPREAD SPECTRUM, MONO)
EFFICIENCY
vs. OUTPUT POWER
60
10
OUTPUT POWER (W)
MAX9736 toc47
10
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9736 toc42
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
30
25
1% THD+N
20
15
10
20
4Ω LOAD, MONO,
f = 1kHz SPREAD SPECTRUM
10
4Ω LOAD
f = 1kHz,
SPREAD SPECTRUM, MONO
5
0
0
0
5
10
OUTPUT POWER (W)
15
20
8
10 12 14 16 18 20 22 24 26 28
SUPPLY VOLTAGE (V)
______________________________________________________________________________________
11
MAX9736
Typical Operating Characteristics (continued)
(MAX9736A, VPVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless
otherwise noted.)
Typical Operating Characteristics (continued)
(MAX9736A, VPVDD = 12V, MOD = high, spread-spectrum modulation mode, VGND = VPGND = 0V, VSHDN = VMUTE = 5V, unless
otherwise noted.)
14
12
10
8
10% THD+N
6
30
25
20
10% THD+N
15
VPVDD = 24V, MONO,
SPREAD SPECTRUM
35
MAX9736 toc50
35
40
MAX9736 toc49
VPVDD = 18V, MONO,
SPREAD SPECTRUM
OUTPUT POWER (W)
OUTPUT POWER (W)
16
40
OUTPUT POWER (W)
VPVDD = 12V, MONO,
SPREAD SPECTRUM
MAX9736 toc48
20
18
OUTPUT POWER
vs. LOAD RESISTANCE
OUTPUT POWER
vs. LOAD RESISTANCE
OUTPUT POWER
vs. LOAD RESISTANCE
30
25
20
10% THD+N
15
10
10
4
5
5
1% THD+N
0
0
0
5
10
15
20
25
0
30
5
10
15
20
25
10
15
20
LOAD RESISTANCE (Ω)
SUPPLY CURRENT
vs. PVDD SUPPLY VOLTAGE
SUPPLY CURRENT
vs. PVDD SUPPLY VOLTAGE
SUPPLY CURRENT
vs. VS VOLTAGE
VREGEN = 0V,
VMUTE = VSHDN = 3.3V,
VS = 5V, MONO
15
15
10
18
SUPPLY VOLTAGE (V)
23
28
30
15
10
0
0
13
25
5
5
0
VREGEN = 0V,
VMUTE = VSHDN = 3.3V,
MONO
SUPPLY CURRENT (mA)
30
20
MAX9736 toc52
20
SUPPLY CURRENT (mA)
VREGEN = VMUTE = VSHDN = 3.3V, MONO
12
5
LOAD RESISTANCE (Ω)
45
8
0
30
LOAD RESISTANCE (Ω)
MAX9736 toc51
0
1% THD+N
MAX9736 toc53
1% THD+N
2
SUPPLY CURRENT (mA)
MAX9736
Mono/Stereo High-Power Class D Amplifier
8
13
18
SUPPLY VOLTAGE (V)
23
28
4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5
VS VOLTAGE (V)
______________________________________________________________________________________
Mono/Stereo High-Power Class D Amplifier
PIN
NAME
FUNCTION
1, 2
OUTL-
Left-Channel Negative Speaker Output
3
BOOT
Charge-Pump Output. Connect a 1μF charge-pump holding capacitor from BOOT to PVDD.
4
MONO
Mono Select. Set MONO high for mono mode, low for stereo mode.
5
FBL
Left-Channel Feedback. Connect feedback resistor between FBL and INL to set amplifier gain.
6
INL
Stereo Left-Channel Inverting Input. In mono mode, INL is the inverting audio input for the mono amplifier.
7, 8, 17
N.C.
No Connection. Not internally connected. OK to connect to PGND.
9
MUTE
Mute Input. Drive MUTE low to place the device in mute mode.
10
SHDN
Shutdown Input. Drive SHDN low to place the device in shutdown mode.
11
REGEN
12
COM
13, 14
AGND
15
REG
16
VS
5V Regulator Supply. Bypass VS to AGND with a 1μF capacitor. If REGEN is low, the internal regulator is
disabled, and an external 5V supply must be connected to VS. See the Power-Supply Sequencing
section.
18
INR
Stereo Right-Channel Inverting Audio Input. In mono mode, INR is the inverting audio input for the
uncommitted preamplifier (see the Mono Configuration section for more details).
19
FBR
Right-Channel Feedback. Connect feedback resistor between FBR and INR to set amplifier gain.
20
MOD
Output Modulation Select. Sets the output modulation scheme:
VMOD = Low, classic PWM/fixed-frequency mode
VMOD = High, filterless modulation/spread-spectrum mode
21
C1N
Charge-Pump Flying-Capacitor Negative Terminal
Charge-Pump Flying-Capacitor Positive Terminal
22
C1P
23, 24
OUTR-
25, 26
OUTR+
27, 30
PVDD
Internal Regulator Enable Input. Connect REGEN to SHDN to enable the internal regulator. Drive REGEN
low to disable the internal regulator, and supply the device with an external 5V supply on VS. See the
Power-Supply Sequencing section.
Internal 2V Bias. Bypass COM to AGND with a 1μF capacitor.
Analog Ground
Internal Regulator Output. Bypass REG to AGND with a 1μF capacitor.
Right-Channel Negative Speaker Output
Right-Channel Positive Speaker Output
Power Supply. Bypass each PVDD pin to ground with 0.1μF capacitors. Also, use a single 220μF
capacitor between PVDD and PGND.
28, 29
PGND
Power Ground
31, 32
OUTL+
Left-Channel Positive Speaker Output
—
EP
Exposed Pad. Must be externally connected to PGND.
______________________________________________________________________________________
13
MAX9736
Pin Description
The MAX9736A/B/D filterless, stereo Class D audio
power amplifiers offer Class AB performance and Class
D efficiency with minimal board space. The MAX9736A
outputs 2x15W in stereo mode and 30W in mono mode.
The MAX9736B/D output 2x6W in stereo mode and 12W
in mono mode. These devices operate from an 8V to
28V supply range.
The MAX9736 features a filterless, spread-spectrum
switching mode (MOD = high) or a classic PWM fixedfrequency switching mode (MOD = low).
The MAX9736 features externally set gain and a lowpower shutdown mode that reduces supply current to
less than 1µA. Comprehensive click-and-pop circuitry
minimizes noise into and out of shutdown or mute.
Operating Modes
Filterless Modulation/PWM Modulation
The MAX9736 features two output modulation schemes,
filterless modulation (MOD = high) or classic PWM (MOD
= low). Maxim’s unique, filterless modulation scheme
eliminates the LC filter required by traditional Class D
amplifiers, reducing component count, conserving
board space, and reducing system cost. Configure for
classic PWM output when using a full LC filter.
Click-and-pop protection does not apply when the output is switching between modulation schemes. To
maintain click-and-pop protection when switching
between output schemes the device must enter shutdown mode and be configured to the new output
scheme before the startup sequence is finished.
Spread-Spectrum Mode
The MAX9736 features a unique spread-spectrum mode
that flattens the wideband spectral components, improving EMI radiated by the speaker and cables. The
switching frequency of the Class D amplifier varies randomly by ±6kHz around the 300kHz center frequency.
Instead of a large amount of spectral energy present at
multiples of the switching frequency, the energy is
spread over a bandwidth that increases with frequency.
Above a few megahertz, the wideband spectrum looks
like white noise for EMI purposes. A proprietary amplifier
topology ensures this white noise does not corrupt the
noise floor in the audio bandwidth. The spread-spectrum mode is enabled only with filterless modulation.
Efficiency
The high efficiency of a Class D amplifier is due to the
switching operation of the output stage transistors. In a
Class D amplifier, the output transistors act as switches
and consume negligible power. Power loss associated
with the Class D output stage is due to the I2R loss of
the MOSFET on-resistance, various switching losses,
and quiescent current overhead.
The theoretical best efficiency of a linear amplifier is 78%
at peak output power. Under typical music reproduction
levels, the efficiency falls below 30%, whereas the
MAX9736 exhibits > 80% efficiency under the same conditions (Figure 1).
Shutdown
The MAX9736 features a shutdown mode that reduces
power consumption and extends battery life in portable
applications. The shutdown mode reduces supply current to 1µA (typ). Drive SHDN high for normal operation. Drive SHDN low to place the device in low-power
shutdown mode. In shutdown mode, the outputs are
high impedance; and the common-mode voltage at the
output decays to zero. In shutdown mode, connect
REGEN low to minimize current consumption.
Mute Function
The MAX9736 features a clickless-and-popless mute
mode. When the device is muted, the signal is attenuated at the speaker and the outputs stop switching. To
mute the MAX9736, drive MUTE low. Hold MUTE low
during system power-up and power-down to ensure
that clicks and pops caused by circuits before the
MAX9736 are suppressed.
EFFICIENCY
vs. TOTAL OUTPUT POWER
100
MAX9736 fig01
Detailed Description
90
80
EFFICIENCY (%)
MAX9736
Mono/Stereo High-Power Class D Amplifier
70
MAX9736A
60
50
40
30
20
CLASS AB
10
0
0
5
10
15
20
TOTAL OUTPUT POWER (W)
Figure 1. MAX9736A Efficiency vs. Class AB Efficiency
14
______________________________________________________________________________________
Mono/Stereo High-Power Class D Amplifier
The MAX9736 features a mono mode that allows the
right and left channels to operate in parallel, achieving
up to 30W (MAX9736A) of output power. Apply a logichigh to MONO to enable mono mode. In mono mode,
an audio signal applied to the left channel (INL) is routed to the H-bridges of both channels. Also in mono
mode, the right-channel preamplifier becomes an
uncommitted operational amplifier, allowing for flexibility in system design. Connect OUTL+ to OUTR+ and
OUTL- to OUTR- using heavy PCB traces as close as
possible to the device. Driving MONO low (stereo
mode) while the outputs are wired together in mono
mode can trigger the short-circuit or thermal-overload
protection or both.
40
35
AMPLITUDE (dBμV/m)
Mono Configuration
EN55022B LIMIT
30
25
20
15
10
5
30
100
200
300
400
500
600
800
700
900
1000
FREQUENCY (MHz)
Figure 2. EMI Performance
FB1
MAX9736
Current Limit
When the output current reaches the current limit, 4.6A
(typ), the MAX9736 disables the outputs and initiates a
450μs startup sequence. The shutdown and startup
sequence is repeated until the output fault is removed.
Properly designed applications do not enter currentlimit mode unless the output is short circuited or connected incorrectly.
MAX9736
Click-and-Pop Suppression
The MAX9736 features comprehensive click-and-pop
suppression that minimizes audible transients on startup and shutdown. While in shutdown, the H-bridge is in
a high-impedance state.
C2
330pF
C1
330pF
FB2
FB1 AND FB2 = WURTH 742792040
Figure 3. Ferrite Bead Filter
Thermal Shutdown
When the die temperature reaches the thermal shutdown threshold, +160°C (typ), the MAX9736 outputs
are disabled. When the die temperature decreases by
30°C, normal operation resumes. Some causes of thermal shutdown are excessively low load impedance,
poor thermal contact between the MAX9736‘s exposed
pad and the PCB, elevated ambient temperature, or
poor PCB layout and assembly.
C2
C4
R1
L1
C1
MAX9736
L2
C3
Applications Information
C5
R2
Filterless Class D Operation
The MAX9736 meets EN55022B EMC radiation limits
with an inexpensive ferrite bead and capacitor filter
when the speaker leads are less than or equal to 1m.
Select a ferrite bead with 100Ω to 600Ω impedance
and rated for at least 2A. The capacitor value varies
based on the ferrite bead chosen and the speaker lead
length. See Figure 3 for the correct connections of
these components.
Figure 4. Output Filter for PWM Mode
When evaluating the MAX9736 with a ferrite bead filter
and resistive load, include a series inductor (68μH for
8Ω load and 33μH for 4Ω load) to model the actual
loudspeaker’s behavior. Omitting the series inductor
______________________________________________________________________________________
15
MAX9736
Mono/Stereo High-Power Class D Amplifier
Table 1. Suggested Values for LC Filter
RL (Ω)
L1, L2 (µH)
C1 (µF)
C2, C3 (µF)
C4, C5 (µF)
R1, R2 (Ω)
4
10
0.47
0.10
0.22
10
8
15
0.15
0.15
0.15
15
16
33
0.10
0.10
0.10
33
reduces the efficiency, the THD+N performance, and
the output power of the MAX9736. When evaluating
with a load speaker, no series inductor is required.
Inductor-Based Output Filters
Some applications use the MAX9736 with a full inductor-/capacitor-based (LC) output filter. Select the PWM
output mode for best audio performance. See Figure 4
for the correct connections of these components.
The load impedance of the speaker determines the filter component selection (see Table 1).
Inductors L1 and L2, and capacitor C1 form the primary output filter. Capacitors C2 and C3 provide commonmode filtering to reduce radiated emissions. Capacitors
C4 and C5, plus resistors R1 and R2, form a Zobel at
the output. A Zobel corrects the output loading to compensate for the rising impedance of the loudspeaker.
Without a Zobel the filter exhibits a peak response near
the cutoff frequency.
Input Capacitor
An input capacitor, CIN, in conjunction with the input
resistor, RIN, of the MAX9736 forms a highpass filter
that removes the DC bias from an incoming signal. The
AC-coupling capacitor allows the amplifier to automatically bias the signal to an optimum DC level. Assuming
zero-source impedance, the -3dB point of the highpass
filter is given by:
f−3dB =
1
2πRINCIN
Choose CIN so that f-3dB is well below the lowest frequency of interest. Use capacitors whose dielectrics have low
voltage coefficients. Capacitors with high-voltage coefficients cause increased distortion close to f-3dB.
COM Capacitor
COM is the output of the internally generated DC bias
voltage. Bypass COM with a 1μF capacitor to AGND.
Component Selection
Gain-Setting Resistors
External feedback resistors set the gain of the
MAX9736. The output stage provides a fixed internal
gain in addition to the externally set input stage gain.
For the MAX9736A/D, the fixed output-stage gain is set
at 17dB (7V/V). For the MAX9736B, the fixed outputstage gain is set at 13.6dB (4.8V/V). Set overall gain by
using resistors RF and RIN (Figure 5) as follows:
⎛R ⎞
MAX9736 A D : A V = −7.1⎜ F ⎟ V V
⎝ RIN ⎠
⎛R ⎞
MAX9736B : A V = −4.8 ⎜ F ⎟ V V
⎝ RIN ⎠
where A V is the desired voltage gain. Choose R F
between 10kΩ and 50kΩ.
The FB terminal is an op amp output and the IN terminal is the op amp inverting input, allowing the MAX9736
to be configured as a summing amplifier, a filter, or an
equalizer.
Power Supplies
The MAX9736 features separate supplies for signal and
power portions of the device, allowing for the optimum
combination of headroom, power dissipation, and noise
immunity. The speaker amplifiers are powered from
PVDD and can range from 8V to 28V. The remainder of
the MAX9736 is powered by VS.
Power-Supply Sequencing
During power-up and power-down, VS must not exceed
PVDD. VS greater than PVDD will damage the device.
RF
AUDIO
INPUT
CIN
RIN
FB_
IN_
OUT_+
COM
OUT_-
CCOM
MAX9736
Figure 5. Setting Gain
16
______________________________________________________________________________________
Mono/Stereo High-Power Class D Amplifier
Supply Bypassing,
Layout, and Grounding
Use wide, low-resistance output traces. Current drawn
from the outputs increases as load impedance
decreases. High-output trace resistance decreases the
power delivered to the load. The MAX9736 TQFN package features an exposed thermal paddle on its underside. This paddle lowers the package’s thermal
resistance by providing a heat conduction path from
the die to the PCB. Connect the exposed thermal pad
to PGND by using a large pad and multiple vias to the
PGND plane.
Proper layout and grounding are essential for optimum
performance. Use wide traces for the power-supply
inputs and amplifier outputs to minimize losses due to
parasitic trace resistance. Proper grounding improves
audio performance, minimizes crosstalk between channels, and prevents switching noise from coupling into
the audio signal. Connect PGND and AGND together at
a single point on the PCB. Route all traces that carry
switching transients away from AGND and the
traces/components in the audio signal path.
Bypass each PVDD pin with a 0.1μF capacitor to PGND.
Place the bypass capacitors as close as possible to the
MAX9736. Place a 220μF capacitor between PVDD and
PGND. Bypass VS with a 1μF capacitor to AGND.
______________________________________________________________________________________
17
MAX9736
Internal Regulator
The MAX9736 features an internal 5V regulator, VS,
powered from PVDD. Connect REGEN to SHDN so that
the internal 5V regulator is enabled/disabled when the
MAX9736 is enabled/disabled. If an external 5V supply
is available, drive REGEN low and connect external 5V
supply to VS to minimize the power dissipation of the
MAX9736.
Mono/Stereo High-Power Class D Amplifier
MAX9736
Typical Application Circuit for Stereo Output Configuration
8V TO 28V
0.1μF
CBULK
220μF
0.1μF
C1
0.1μF
C2
1μF
(16V)
1μF
REG 15
VS
PVDD
C1P
16
27, 30
22
REGULATOR
C1N
21
3 BOOT
CHARGE PUMP
1μF
20kΩ
FBL 5
20kΩ
31, 32 OUTL+
INL 6
470nF
1, 2 OUTL-
COM 12
BIAS
POWER
STAGE
1μF
20kΩ
20kΩ
470nF
25, 26 OUTR+
INR 18
23, 24 OUTR-
FBR 19
REGEN 11
SHDN 10
SHUTDOWN
MUTE
MUTE 9
CONTROL
5V
MAX9736
MOD 20
MONO 4
13, 14
AGND
28, 29
PGND
7, 8, 17
N.C.
NOTE: PREAMPLIFIER GAIN SET AT 0dB.
18
______________________________________________________________________________________
Mono/Stereo High-Power Class D Amplifier
8V TO 28V
0.1μF
CBULK
220μF
0.1μF
C1
0.1μF
C2
1μF
(16V)
1μF
REG 15
VS
PVDD
C1P
16
27, 30
22
REGULATOR
C1N
21
3 BOOT
CHARGE PUMP
1μF
LPF
FBL 5
FBR
31, 32 OUTL+
INL 6
1, 2 OUTL-
COM 12
BIAS
POWER
STAGE
1μF
HPF
25, 26 OUTR+
INR 18
AUDIO
INPUT
23, 24 OUTR-
FBR 19
FBR
REGEN 11
SHDN 10
SHUTDOWN
MUTE
MUTE 9
MAX9736
CONTROL
5V
MOD 20
MONO 4
13, 14
AGND
28, 29
PGND
7, 8, 17
N.C.
______________________________________________________________________________________
19
MAX9736
Typical Application Circuit for Single (Mono) Output Configuration
Mono/Stereo High-Power Class D Amplifier
C1P
C1N
MOD
FBR
INR
N.C.
24
23
22
21
20
19
18
17
OUTR+ 25
16
VS
OUTR+ 26
15
REG
PVDD 27
14
AGND
PGND 28
13
AGND
12
COM
MAX9736
PGND 29
PVDD 30
OUTL+ 31
EP*
+
Ordering Information (continued)
PART
OUTR-
TOP VIEW
OUTR-
MAX9736
Pin Configuration
6
7
8
N.C.
BOOT
5
N.C.
OUTL-
4
INL
3
FBL
2
MONO
1
OUTL-
OUTL+ 32
TQFN
11
REGEN
10
SHDN
9
MUTE
STEREO/MONO
OUTPUT POWER
MAX9736AETJ/V+
2 x 15W/
1 x 30W
32 TQFN-EP*
7mm x 7mm
MAX9736BETJ+
2 x 6W/
1 x 12W
32 TQFN-EP*
7mm x 7mm
MAX9736BETJ/V+
2 x 6W/
1 x 12W
32 TQFN-EP*
7mm x 7mm
MAX9736DETJ+
2 x 6W/
1 x 12W
32 TQFN-EP*
5mm x 5mm
MAX9736DETJ/V+
2 x 6W/
1 x 12W
32 TQFN-EP*
5mm x 5mm
Note: All devices are specified over the -40°C to +85°C operating temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
/V denotes an automotive qualified part.
EP* = EXPOSED PAD, CONNECT TO PGND.
Chip Information
PROCESS: BiCMOS
20
PIN-PACKAGE
______________________________________________________________________________________
Mono/Stereo High-Power Class D Amplifier
PACKAGE TYPE
PACKAGE CODE
DOCUMENT NO.
32 TQFN-EP (7mm x 7mm)
T3277-3
21-0144
32 TQFN-EP (5mm x 5mm)
T3255-4
21-0140
______________________________________________________________________________________
21
MAX9736
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
MAX9736
Mono/Stereo High-Power Class D Amplifier
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
22
______________________________________________________________________________________
Mono/Stereo High-Power Class D Amplifier
QFN THIN.EPS
______________________________________________________________________________________
23
MAX9736
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
MAX9736
Mono/Stereo High-Power Class D Amplifier
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
24
______________________________________________________________________________________
Mono/Stereo High-Power Class D Amplifier
REVISION
NUMBER
REVISION
DATE
DESCRIPTION
PAGES
CHANGED
0
1/08
Initial release
1
12/08
Corrected various errors
—
2
8/09
Added MAX9736D and automotive parts numbers and updated the Absolute
Maximum Ratings section
1, 2, 3, 4,13,
15, 19, 20, 21
3
9/09
Corrected error in Absolute Maximum Ratings, Pin Description, Typical
Application Circuit for Stereo Output Configuration, and Typical Application
Circuit for Single (Mono) Output Configuration
2, 12, 17, 18
1–15, 17–21
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 25
© 2009 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
MAX9736
Revision History