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MAX9737ETG+T

P1-P3P4-P6P7-P9P10-P12P13-P13
General Description
The MAX9737 mono 7W Class D amplifier provides a
high-performance, thermally efficient amplifier solution
that offers up to 88% efficiency at a 12V supply. The
device operates from 8V to 28V and provides a high 80dB
PSRR, eliminating the need for a regulated power supply.
Filterless modulation allows the MAX9737 to pass CE
EMI limits with 1m cables using only a low-cost ferrite
bead and small-value capacitor on each output.
Comprehensive click-and-pop suppression circuitry
reduces noise on power-up/down or into and out of
shutdown or mute.
An input op amp allows the user to create a lowpass or
highpass filter, and select an optimal gain. The internal
precharge circuit ensures clickless/popless turn-on
within 10ms.
The MAX9737 is available in the 24-pin, TQFN-EP pack-
age and is specified over the -40°C to +85°C tempera-
ture range.
Applications
2.1 Notebook PCs
LCD/PDP/CRT Monitors
PC Surround Speakers
MP3 Docking Stations
Features
♦ 8V to 28V Supply Voltage Range
♦ Spread-Spectrum Modulation Enables Low-EMI
Solution
♦ Passes EMI Limit with Up to 1m of Speaker Cable
♦ High 80dB PSRR
♦ Up to 88% Efficiency Eliminates Heatsink
♦ Thermal and Output Current Protection
♦ < 1µA Shutdown Mode
♦ Click-and-Pop Suppression
♦ < 10ms Turn-On Time
♦ Space-Saving, 4mm x 4mm x 0.8mm, 24-Pin TQFN
Package
MAX9737
Mono 7W Class D Amplifier
________________________________________________________________
Maxim Integrated Products
1
19-4327; Rev 0; 10/08
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.
EVALUATION KIT
AVAILABLE
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX9737ETG+ -40°C to +85°C 24 TQFN-EP*
+
Denotes a lead-free/RoHS-compliant package.
*
EP = Exposed pad.
MAX9737
AUDIO
INPUT
SHDN
MUTE
8Ω
8V TO 28V
INPUT RESISTORS AND
CAPACITORS SELECT GAIN
AND CUTOFF FREQUENCY
PRECHARGE
Simplified Diagram
Pin Configuration and Typical Application Circuit appear at
end of data sheet.
MAX9737
Mono 7W Class D Amplifier
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
PVDD
= 12V, V
AGND
= V
PGND
= 0, V
SHDN
= V
MUTE
= 5V, C1 = 0.1µF, C
IN
= 0.47µF, C2 = C
COM
= C
REG
= 1µF, R
IN
= R
FB
= 20kΩ,
R
L
= ∞, AC measurement bandwidth 22Hz to 22kHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
(Note 3)
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
AGND to PGND .....................................................-0.3V to +0.3V
IN, PRE, PC, COM to AGND.....................-0.3V to (V
REG
+ 0.3V)
MUTE, SHDN to AGND ............................................-0.3V to +6V
REG to AGND ...............................................-0.3V to (V
S
+ 0.3V)
V
S
to AGND ..............................................................-0.3V to +6V
OUT+, OUT- to PGND .............................-0.3V to (PVDD + 0.3V)
C1N to PGND ..........................................-0.3V to (PVDD + 0.3V)
C1P to PGND .........................(PVDD - 0.3V) to (V
CHOLD
+ 0.3V)
CHOLD to PGND .......................................(V
C1P
- 0.3V) to +36V
OUT+, OUT-, Short Circuit to PGND or PVDD ...........Continuous
Thermal Limits (Notes 1, 2)
Continuous Power Dissipation (T
A
= +70°C)
24-Pin TQFN Single-Layer PCB (derate 20.8mW/°C
above +70°C)........................................................1666.7mW
θ
JA
................................................................................48°C/W
θ
JC
..................................................................................3°C/W
Continuous Power Dissipation
24-Pin TQFN Multiple-Layer PCB
(derate 27.8mW/°C above +70°C)........................2222.2mW
θ
JA
................................................................................36°C/W
θ
JC
..................................................................................3°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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
AMPLIFIER DC CHARACTERISTICS
Speaker-Supply Voltage Range PVDD Inferred from PSRR test 8 28 V
Undervoltage Lockout UVLO 6.8 V
T
A
= +25°C 15 20
Quiescent Supply Current I
PVDD
25
mA
Shutdown Supply Current I
SHDN
V
SHDN
= 0, T
A
= +25°C 1 10 µA
REG Voltage V
REG
4.0 4.2 4.5 V
Preregulator Voltage V
S
4.85 V
COM Voltage V
COM
1.94 2.06 2.16 V
INPUT AMPLIFIER CHARACTERISTICS
Capacitive Drive C
L
No sustained oscillation 30 pF
Output Swing Sinking ±1mA (Note 4) 2.05 V
Open-Loop Gain A
VO
88 dB
Input Offset Voltage V
OS
IN to COM ±2 mV
Input Amplifier Slew Rate 2.5 V/µs
Input Amplifier Unity-Gain
Bandwidth
3.5 MHz
Note 1: Thermal performance of this device is highly dependent on PCB layout. See the
Applications Information
section for more detail.
Note 2: 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
.
MAX9737
Mono 7W Class D Amplifier
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUTPUT AMPLIFIER CHARACTERISTICS
Output Amplifier Gain A
V
Preamplifier gain = 0dB (Note 7) 13.1 13.6 14.1 dB
Output Current Limit 3 4.6 A
Output Offset V
OS
OUT+ to OUT-, T
A
= +25°C ±2 ±10 mV
V
PVDD
= 8V to 28V, T
A
= +25°C 65 80
Power-Supply Rejection Ratio PSRR
f = 1kHz, 100mV
P-P
ripple 88
dB
THD+N = 10%, R
L
= 8Ω (Note 5) 6 7.4
Output Power P
OUT
THD+N = 10%, R
L
= 4Ω (Note 6) 13
W
THD + Noise THD+N P
OUT
= 2W, f = 1kHz, R
L
= 8Ω (Note 5) 0.06 %
Signal-to-Noise Ratio SNR
A-weighted, P
OUT
= THD+N at 1%,
f
IN
= 1kHz
97 dB
Noise V
N
A-weighted (Note 4) 100 µV
RMS
Efficiency η P
OUT
= 4W 85 %
Into shutdown 38
Out of shutdown 38
Into mute 38
Click-and-Pop Level K
CP
Peak voltage, 32
samples/second,
A-weighted
(Notes 4, 5, 8)
Out of mute 38
dBV
Switching Frequency 270 300 330 kHz
Spread-Spectrum Bandwidth ±4 kHz
Thermal-Shutdown Level +160 °C
Thermal-Shutdown Hysteresis 30 °C
Turn-On Time t
ON
From shutdown to full operation 9 10 ms
DIGITAL INTERFACE (SHDN, MUTE)
Input-Voltage High V
INH
2V
Input-Voltage Low V
INL
0.8 V
Input-Voltage Hysteresis 50 mV
Input Leakage Current T
A
= +25°C ±10 µA
ELECTRICAL CHARACTERISTICS (continued)
(V
PVDD
= 12V, V
AGND
= V
PGND
= 0, V
SHDN
= V
MUTE
= 5V, C1 = 0.1µF, C
IN
= 0.47µF, C2 = C
COM
= C
REG
= 1µF, R
IN
= R
FB
= 20kΩ,
R
L
= ∞, AC measurement bandwidth 22Hz to 22kHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
(Note 3)
Note 3: All devices are 100% production tested at T
A
= +25°C, and all temperature limits are guaranteed by design.
Note 4: Amplifier inputs AC-coupled to GND.
Note 5: 8Ω resistive load in series with 68mH inductive load connected across OUT+ and OUT- outputs.
Note 6: 4Ω resistive load in series with 33µH inductive load connected across OUT+ and OUT- outputs for V
PVDD
≤ 12V.
Note 7: Output amplifier gain is defined as:
Note 8: Mode transition controlled by SHDN and MUTE.
20 ×
−
⎛
⎝
⎜
⎞
⎠
⎟
+−
log
|( ) ( )|
||
VV
V
OUT OUT
PRE
P1-P3P4-P6P7-P9P10-P12P13-P13

MAX9737ETG+T

Mfr. #:
Buy MAX9737ETG+T
Manufacturer:
Maxim Integrated
Description:
Audio Amplifiers Mono 7W Class D Amplifier
Lifecycle:
New from this manufacturer.
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