MAX9759 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – 3.2W, High-Efficiency, Low-EMI, Filterless, Class D Audio Amplifier

19-3691; Rev 0; 5/05
3.2W, High-Efficiency, Low-EMI, Filterless,
Class D Audio Amplifier
General Description
The MAX9759 mono class D, audio power amplifier
provides class AB amplifier audio performance with the
benefits of class D efficiency, eliminating the need for a
heatsink and extending battery life. The MAX9759 deliv-
ers up to 3.2W of continuous power into a 4Ω load while
offering greater than 90% efficiency. Maxim’s next-gen-
eration, low-EMI modulation scheme allows the amplifi-
er to operate without an external LC filter while still
meeting FCC EMI-radiated emission levels.
The MAX9759 offers two modulation schemes: a fixed-
frequency modulation (FFM) mode and a spread-spec-
trum modulation (SSM) mode. The SSM mode flattens
the wideband spectral components, reducing EMI-radi-
ated emissions due to the modulation frequency.
Furthermore, the MAX9759 oscillator can be synchro-
nized to an external clock through the SYNC input,
allowing the switching frequency to range from
1000kHz to 1600kHz. The SYNC input and SYNC_OUT
output of the MAX9759 allow multiple Maxim class D
amplifiers to be cascaded and frequency locked, mini-
mizing interference due to clock intermodulation. The
MAX9759 utilizes fully differential input amplifiers, a full-
bridged output, comprehensive click-and-pop suppres-
sion, and features four selectable gain settings (6dB,
12dB, 18dB, 24dB).
The MAX9759 features high 81dB PSRR, low 0.02%
THD+N, and SNR in excess of 90dB. Short-circuit and
thermal-overload protection prevents damage to the
device during a fault condition. The MAX9759 operates
from a single 5V supply, consumes 8.4mA of supply
current, and is available in a 16-pin thin QFN package
(4mm x 4mm x 0.8mm) and a 16-pin TSSOP package.
The MAX9759 is fully specified over the extended -40°C
to +85°C temperature range.
Applications
Cell Phones/PDAs
Notebook PCs
Portable DVD Players
Flat-Panel PC Monitors
LCD TVs
LCD Projectors
Pin Configurations appear at end of data sheet.
Features
♦ 3.2W into 4Ω Load (THD+N = 10%)
♦ Filterless Amplifier Passes FCC Radiated
Emissions Standards with 7.6cm of Cable
♦ 92% Efficiency
♦ High PSRR (81dB at 1kHz)
♦ Low 0.02% THD+N
♦ External Clock Synchronization for Multiple,
Cascaded Maxim Class D Amplifiers
♦ 3.0V to 5.5V Single-Supply Operation
♦ Pin-Selectable Gain (6dB, 12dB, 18dB, 24dB)
♦ Integrated Click-and-Pop Suppression
♦ Low Quiescent Current (8.4mA)
♦ Low-Power Shutdown Mode (10µA)
♦ Mute Function
♦ Short-Circuit and Thermal-Overload Protection
♦ Available in Thermally Efficient Packages
16-Pin TQFN (4mm x 4mm x 0.8mm)
16-Pin TSSOP
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX9759ETE+
-40°C to +85°C
16 TQFN-EP*
MAX9759EUE+
-40°C to +85°C
16 TSSOP
+Denotes lead-free package.
*EP = Exposed paddle.
Simplified Block Diagram
V_DD
DIFFERENTIAL
AUDIO INPUT
MODULATOR
AND H-BRIDGE
SYNC
INPUT
SYNC
OUTPUT
OSCILLATOR
MAX9759
GAIN
CONTROL
SHDN
CONTROL
MUTE
CONTROL
MONO SPEAKER
OUTPUT
G1
G2
SHDN
MUTE
________________________________________________________________ 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.