MAX9701EBP-T ,1.3W, Filterless, Stereo Class D Audio Power AmplifierBlock DiagramNotebooksVDDHandheld Gaming ConsolesDocking StationsMAX9701INR+MP3 Players RIGHTMODULA ..
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MAX9701EBP-T-MAX9701ETG+
1.3W, Filterless, Stereo Class D Audio Power Amplifier
General DescriptionThe MAX9701 stereo class D audio power amplifier pro-
vides class AB amplifier audio performance with the
benefits of class D efficiency, eliminating the need for a
heatsink while extending battery life. The MAX9701
delivers up to 1.3W per channel into an 8Ωload while
offering 87% efficiency. Maxim’s next-generation, low-
EMI modulation scheme allows the amplifier to operate
without an external LC filter while still meeting FCC EMI
emission levels.
The MAX9701 offers two modulation schemes: a fixed-fre-
quency (FFM) mode, and a spread-spectrum (SSM)
mode that reduces EMI-radiated emissions. The
MAX9701 oscillator can be synchronized to an external
clock through the SYNC input, allowing synchronization of
multiple Maxim class D amplifiers. The sync output
(SYNC_OUT) can be used for a master-slave application
where more channels are required. The MAX9701 fea-
tures a fully differential architecture, a full bridge-tied load
(BTL) output, and comprehensive click-and-pop suppres-
sion. The device features internally set gains of 0dB, 6dB,
12dB, and 18dB selected through two gain-select inputs,
further reducing external component count.
The MAX9701 features high 80dB PSRR, less than 0.1%
THD+N, and SNR in excess of 88dB. Short-circuit and
thermal-overload protection prevent the device from
being damaged during a fault condition. The MAX9701 is
available in 24-pin thin QFN-EP (4mm x 4mm x 0.8mm),
20-pin TSSOP, and 20-bump UCSP™ (2mm x 2.5mm x
0.6mm) packages. The MAX9701 is specified over the
extended -40°C to +85°C temperature range.
ApplicationsCellular Phones
Notebooks
Handheld Gaming Consoles
Docking Stations
MP3 Players
FeaturesPatented Spread-Spectrum Modulation Lowers
Radiated EmissionsSingle-Supply Operation (2.5V to 5.5V)1.3W Stereo Output (8Ω, VDD= 5V, THD+N = 1%)No LC Output Filter Required87% Efficiency (RL= 8Ω, PO= 1000mW)Less Than 0.1% THD+NHigh 80dB PSRRFully Differential InputsIntegrated Click-and-Pop SuppressionTypical Low Quiescent Current (9mA)Typical Low-Power Shutdown Mode (0.1µA)Short-Circuit and Thermal-Overload ProtectionAvailable in Thermally Efficient, Space-Saving
Packages
24-Pin Thin QFN-EP (4mm x 4mm x 0.8mm)
20-Pin TSSOP
20-Bump UCSP (2mm x 2.5mm x 0.6mm)
MAX9701
1.3W, Filterless, Stereo Class D Audio
Power Amplifier
Block Diagram
Ordering Information19-3457; Rev 0; 6/05
Pin Configurations appear at end of data sheet.UCSP is a trademark of Maxim Integrated Products, Inc.
+ Denotes lead-free package.
MAX9701
1.3W, Filterless, Stereo Class D Audio
Power Amplifier
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VDD= PVDD= SHDN= 3.3V, GND = PGND = 0V, SYNC = 0V(FFM), gain = 6dB (GAIN1 = 0, GAIN2 = 1), RLconnected between
OUT+ and OUT-, RL= ∞, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Notes 1, 2)
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.
VDDto GND..............................................................................6V
VDDto PVDD..........................................................-0.3V to +0.3V
PVDDto PGND.........................................................................6V
GND to PGND.......................................................-0.3V to +0.3V
All Other Pins to GND.................................-0.3V to (VDD+ 0.3V)
Continuous Current In/Out of PVDD, PGND, OUT_.........±800mA
Continuous Input Current (all other pins)..........................±20mA
Duration of OUT_ Short Circuit to GND or PVDD........Continuous
Duration of Short Circuit Between OUT+ and OUT-......Continuous
Continuous Power Dissipation (TA= +70°C)
20-Bump UCSP (derate 10mW/°C above +70°C)...........800mW
20-Pin TSSOP (derate 11mW/°C above +70°C)...........879.1mW
24-Pin Thin QFN (derate 20.8mW/°C above +70°C)..1666.7mW
Junction Temperature......................................................+150°C
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Bump Temperature (soldering) Reflow............................+235°C
Lead Temperature (soldering, 10s).................................+300°C
MAX9701
1.3W, Filterless, Stereo Class D Audio
Power Amplifier
Note 2:Testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For RL= 4Ω, L = 33µH.
For RL= 8Ω, L = 68µH.
Note 3:When driving speakers below 4Ωwith large signals, exercise care to avoid violating the absolute maximum rating for continuous
output current.
Note 4:Testing performed with 8Ωresistive load in series with 68µH inductive load connected across the BTL output. Mode transi-
tions are controlled by SHDN. KCPlevel is calculated as: 20 x log[(peak voltage under normal operation at rated power
level) / (peak voltage during mode transition, no input signal)]. Units are expressed in dB.
ELECTRICAL CHARACTERISTICS (continued)(VDD= PVDD= SHDN= 3.3V, GND = PGND = 0V, SYNC = 0V(FFM), gain = 6dB (GAIN1 = 0, GAIN2 = 1), RLconnected between
OUT+ and OUT-, RL= ∞, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Notes 1, 2)
MAX9701
1.3W, Filterless, Stereo Class D Audio
Power Amplifier
Typical Operating Characteristics(VDD= PVDD= SHDN= 3.3V, GND = PGND = 0V, SYNC = VDD(SSM), gain = 6dB (GAIN1 = 0, GAIN2 = 1)).
MAX9701
1.3W, Filterless, Stereo Class D Audio
Power Amplifier
Typical Operating Characteristics (continued)(VDD= PVDD= SHDN= 3.3V, GND = PGND = 0V, SYNC = VDD(SSM), gain = 6dB (GAIN1 = 0, GAIN2 = 1)).
