19-4217; Rev 1; 6/10
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
1/MAX792
General Description
Features
The MAX9791 combines a stereo 2W Class D power
amplifier, a stereo 180mW DirectDrive® headphone
amplifier, and a 120mA low-dropout (LDO) linear regu-
lator in a single device. The MAX9792 combines a
mono 3W Class D power amplifier, a stereo 180mW
DirectDrive headphone amplifier, and a 120mA LDO
linear regulator in a single device.
o Windows Vista® Premium Compliant
o Low EMI Filterless Class D Speaker Amplifiers
Pass EN55022B Emissions Limit with 30cm of
Speaker Cable
o 180mW DirectDrive Headphone Amplifier
o Excellent RF Immunity
o Integrated 120mA LDO
o Eliminates Headphone Ground Loop Noise
o Wake-on-Beep Function
o Click-and-Pop Suppression
o Short-Circuit and Thermal-Overload Protection
The MAX9791/MAX9792 feature Maxim’s DirectDrive
headphone amplifier architecture that produces a
ground-referenced output from a single supply, eliminat-
ing the need for large DC-blocking capacitors, saving
cost, board space, and component height. High 107dB
DC PSRR and low 0.006% THD+N ensure clean, low-
distortion amplification of the audio signal.
The ground sense feature senses and corrects for the
voltage difference between the output jack ground and
device signal ground. This feature minimizes head-
phone amplifier crosstalk by sensing the impedance in
the ground return trace and correcting for it at the out-
put jack. This feature also minimizes ground-loop noise
when the output socket is used as a line out connection
to other grounded equipment (for example, a PC con-
nected to a home hi-fi system).
The MAX9791/MAX9792 feature low RF susceptibility,
allowing the amplifiers to successfully operate in close
proximity to wireless applications. The MAX9791/
MAX9792 Class D amplifiers feature Maxim’s spread-
spectrum modulation and active emissions limiting cir-
cuitry. Industry-leading click-and-pop suppression
eliminates audible transients during power-up and shut-
down cycles.
o Thermally Efficient, Space-Saving Package
28-Pin TQFN-EP (4mm x 4mm x 0.75mm)
Ordering Information
STEREO/
MONO
LDO
OUTPUT
PART
PIN-PACKAGE
MAX9791AETI+
MAX9791BETI+
MAX9791CETI+
MAX9792AETI+
MAX9792CETI+
Stereo
Stereo
Stereo
Mono
Mono
4.75V
3.3V
28 TQFN-EP*
28 TQFN-EP*
28 TQFN-EP*
28 TQFN-EP*
28 TQFN-EP*
1.8V
4.75V
1.8V
Note: All devices are specified over the -40°C to +85°C
extended temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
The MAX9791/MAX9792 wake-on-beep feature wakes
up the speaker and headphone amplifiers when a qual-
ified beep signal is detected at the BEEP input.
For maximum flexibility, separate speaker and head-
phone amplifier control inputs provide independent
shutdown of the speaker and headphone amplifiers.
Additionally the LDO can be enabled independently of
the audio amplifiers.
Simplified Block Diagrams
SPEAKER AND LDO
SUPPLY
2.7V TO 5.5V
HEADPHONE SUPPLY
2.7V TO 5.5V
CLASS D
AMP
MAX9791
The MAX9791/MAX9792 feature thermal-overload and
output short-circuit protection. The devices are avail-
able in 28-pin TQFN packages and are specified over
the -40°C to +85°C extended temperature range.
CLASS D
AMP
Applications
Notebook Computers
Tablet PCs
SPKR_EN
HP_EN
LDO_EN
BEEP
AVDD
LDO
Portable Multimedia Players
1.8V, 3.3V, OR 4.75V
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
Simplified Block Diagrams continued at end of data sheet.
Windows Vista is a registered trademark of Microsoft Corp.
________________________________________________________________ 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.
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