19-0731; Rev 0; 1/07
KIT
ATION
EVALU
BLE
AVAILA
Single-/Dual-Supply, Stereo 16W,
Class D Amplifier with Differential Inputs
Features
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The MAX9742 stereo Class D audio power amplifier
delivers up to 2 x 16W into 4Ω loads. The MAX9742
features high-power efficiency (92% with 8Ω loads),
eliminating the need for a bulky heatsink and conserving power. The MAX9742 operates from a 20V to 40V
single supply or a ±10V to ±20V dual supply. Features
include fully differential inputs, comprehensive clickand-pop suppression, low-power shutdown mode, and
an externally adjustable gain. Short-circuit and thermaloverload protection prevent the device from being
damaged during a fault condition.
The MAX9742 is available in a thermally efficient 36-pin
TQFN (6mm x 6mm x 0.8mm) package and is specified
over the -40°C to +85°C extended temperature range.
2 x 16W Output Power (RL = 4Ω, THD+N = 10%)
High Efficiency: Up to 92% with RL = 8Ω
Mute and Shutdown Modes
Differential Inputs Suppress Common-Mode Noise
Adjustable Gain
Integrated Click-and-Pop Suppression
Low 0.06% THD+N at 3.5W, RL = 8Ω
Output Short-Circuit and Thermal Protection
Available in Space-Saving, 6mm x 6mm, 36-Pin
TQFN Package
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX9742ETX+
-40°C to +85°C
36 TQFN-EP*
Applications
CRT TVs
PKG
CODE
T3666-3
+Denotes lead-free package.
Flat-Panel Display TVs
*EP = Exposed paddle.
Audio Docking Stations
Pin Configuration located at end of data sheet.
Multimedia Monitors
Simplified Block Diagrams
RF1
SINGLE-SUPPLY CONFIGURATION
CFBL
20V TO 40V
FBL VDD
LEFT NEGATIVE
AUDIO INPUT
LEFT POSITIVE
AUDIO INPUT
CIN
CIN
RIN1
INL-
RIN2
MAX9742
CLASS D
MODULATOR AND
HALF-BRIDGE
INL+
RF2
OUTL
COUT
LF
RZBL
CFBL
CF
VDD
MID
CZBL
2
RF2
RIGHT POSITIVE
AUDIO INPUT
RIGHT NEGATIVE
AUDIO INPUT
CIN
RIN2
CIN
RIN1
CFBR
CLASS D
MODULATOR AND
HALF-BRIDGE
INR+
OUTR
COUT
LF
RZBL
INRCONTROL LOGIC/
POWER-UP
SEQUENCING
FBR
VSS
ON
RF1
CZBL
SFT
SHDN
CFBR
CF
CSFT
OFF
Simplified Block Diagrams continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
MAX9742
General Description