MAX9701_09 Datasheet, PDF (1/22 Pages) Maxim Integrated Products – 1.3W, Filterless, Stereo Class D Audio Power Amplifier

19-3457; Rev 3; 3/09
1.3W, Filterless, Stereo Class D Audio
Power Amplifier
General Description
The 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 8Ω load 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),
and 20-bump UCSP™ (2mm x 2.5mm x 0.6mm) pack-
ages. The MAX9701 is specified over the extended
-40°C to +85°C temperature range.
Applications
Cellular Phones
Notebooks
Handheld Gaming Consoles
Docking Stations
MP3 Players
Pin Configurations appear at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
Features
o Patented Spread-Spectrum Modulation Lowers
Radiated Emissions
o Single-Supply Operation (2.5V to 5.5V)
o 1.3W Stereo Output (8Ω, V_DD = 5V, THD+N = 1%)
o No LC Output Filter Required
o 87% Efficiency (R_L = 8Ω, P_OUT = 1000mW)
o Less Than 0.1% THD+N
o High 80dB PSRR
o Fully Differential Inputs
o Integrated Click-and-Pop Suppression
o Typical Low Quiescent Current (9mA)
o Typical Low-Power Shutdown Mode (0.1µA)
o Short-Circuit and Thermal-Overload Protection
o Available in Thermally Efficient, Space-Saving
Packages
24-Pin Thin QFN-EP (4mm x 4mm x 0.8mm)
20-Bump UCSP (2mm x 2.5mm x 0.6mm)
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX9701EBP+TG45 -40°C to +85°C 20 UCSP
MAX9701ETG+
-40°C to +85°C 24 TQFN-EP*
+Denotes lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Block Diagram
VDD
INR+
INR-
GAIN1
GAIN2
MAX9701
RIGHT
MODULATOR
AND H-BRIDGE
GAIN
INL+
INL-
SYNC
LEFT
MODULATOR
AND H-BRIDGE
OSCILLATOR
SYNC_OUT
________________________________________________________________ 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.