MAX9742 Datasheet, PDF (1/36 Pages) Maxim Integrated Products – Single-/Dual-Supply, Stereo 16W, Class D Amplifier with Differential Inputs

19-0731; Rev 0; 1/07
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Single-/Dual-Supply, Stereo 16W,
Class D Amplifier with Differential Inputs
General Description
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 conserv-
ing power. The MAX9742 operates from a 20V to 40V
single supply or a ±10V to ±20V dual supply. Features
include fully differential inputs, comprehensive click-
and-pop suppression, low-power shutdown mode, and
an externally adjustable gain. Short-circuit and thermal-
overload 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.
CRT TVs
Flat-Panel Display TVs
Audio Docking Stations
Multimedia Monitors
Applications
Features
o 2 x 16W Output Power (R_L = 4Ω, THD+N = 10%)
o High Efficiency: Up to 92% with R_L = 8Ω
o Mute and Shutdown Modes
o Differential Inputs Suppress Common-Mode Noise
o Adjustable Gain
o Integrated Click-and-Pop Suppression
o Low 0.06% THD+N at 3.5W, R_L = 8Ω
o Output Short-Circuit and Thermal Protection
o Available in Space-Saving, 6mm x 6mm, 36-Pin
TQFN Package
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
PKG
CODE
MAX9742ETX+ -40°C to +85°C
+Denotes lead-free package.
*EP = Exposed paddle.
36 TQFN-EP*
T3666-3
Pin Configuration located at end of data sheet.
Simplified Block Diagrams
SINGLE-SUPPLY CONFIGURATION
RF1
CFBL
20V TO 40V
CIN
RIN1
LEFT NEGATIVE
INL-
AUDIO INPUT
CIN
LEFT POSITIVE
RIN2
INL+
AUDIO INPUT
RF2 CFBL
VDD
MID
2
RF2 C_FBR
CIN
RIGHT POSITIVE
RIN2
INR+
AUDIO INPUT
CIN
RIGHT NEGATIVE
RIN1
INR-
AUDIO INPUT
FBL V_DD
MAX9742
CLASS D
MODULATOR AND
HALF-BRIDGE
OUTL
CLASS D
MODULATOR AND
HALF-BRIDGE
OUTR
CONTROL LOGIC/
POWER-UP
SEQUENCING
FBR
VSS SHDN SFT
CFBR
ON
CSFT
RF1
OFF
Simplified Block Diagrams continued at end of data sheet.
LF
COUT
RZBL
CF
CZBL
LF
COUT
RZBL
CF
CZBL
________________________________________________________________ Maxim Integrated Products 1
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.