19-3006; Rev 0; 1/04
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
General Description
Features
The MAX9750/MAX9751/MAX9755 combine a stereo,
2.6W audio power amplifier and stereo DirectDrive
110mW headphone amplifier in a single device. The
headphone amplifier uses Maxim’s patented DirectDrive
architecture that produces a ground-referenced output
from a single supply, eliminating the need for large DC-
blocking capacitors, saving cost, space, and component
height. A high 90dB PSRR and low 0.01% THD+N
ensures clean, low-distortion amplification of the audio
signal.
♦ No DC-Blocking Capacitors Required—Provides
Industry’s Most Compact Notebook Audio
Solution
♦ PC2001 Compliant
♦ 5V Single-Supply Operation
♦ Class AB 2.6W Stereo BTL Speaker Amplifiers
♦ 110mW DirectDrive Headphone Amplifiers
♦ High 90dB PSRR
The MAX9750 features an analog volume control, and a
BEEP input. The MAX9751 features a 2:1 input multiplexer,
allowing multiple audio sources to be selected. All devices
feature a single-supply voltage, a shutdown mode, logic-
selectable gain, and a headphone sense input. Industry-
leading click-and-pop suppression eliminates audible
transients during power and shutdown cycles.
♦ Low-Power Shutdown Mode
♦ Industry-Leading Click-and-Pop Suppression
♦ Low 0.01% THD+N at 1kHz
♦ Short-Circuit and Thermal Protection
♦ Selectable Gain Settings
The MAX9750/MAX9751/MAX9755 are offered in space-
saving, thermally efficient 28-pin thin QFN (5mm x 5mm
x 0.8mm) and 28-pin TSSOP-EP packages. Both devices
have thermal-overload and output short-circuit protec-
tion, and are specified over the extended -40°C to +85°C
temperature range.
♦ Analog Volume Control (MAX9750)
♦ Beep Input with Glitch Filter (MAX9750)
♦ 2:1 Stereo Input MUX (MAX9751)
♦ ±±kV ꢀSD-Protected Headphone Driver Outputs
Applications
♦ Available in Space-Saving, Thermally ꢀfficient
Packages
Notebook PCs
Tablet PCs
Flat-Panel TVs
PC Displays
2±-Pin Thin QFN (5mm x 5mm x 0.±mm)
2±-Pin TSSOP-ꢀP
Portable DVD
LCD Projectors
Ordering Information
Simplified Block Diagrams
PIN-
PACKAGꢀ
MAXIMUM
GAIN (dB)
PART
TꢀMP RANGꢀ
MAX9750AETI*† -40°C to +85°C 28 Thin QFN
MAX9750AEUI*† -40°C to +85°C 28 TSSOP-EP**
MAX9750BETI*† -40°C to +85°C 28 Thin QFN
MAX9750BEUI*† -40°C to +85°C 28 TSSOP-EP**
MAX9750CETI† -40°C to +85°C 28 Thin QFN
MAX9750CEUI*† -40°C to +85°C 28 TSSOP-EP**
13.5
13.5
19.5
19.5
10.5
10.5
10.5
10.5
10.5
10.5
MAX9751ETI*†
-40°C to +85°C 28 Thin QFN
MAX9751EUI*†
-40°C to +85°C 28 TSSOP-EP**
VOL
MAX9755AETI*† -40°C to +85°C 28 Thin QFN
MAX9755AEUI*† -40°C to +85°C 28 TSSOP-EP**
BEEP
*Future product—contact factory for availability.
**EP = Exposed Paddle.
†Lead-free package.
MAX9750
Simplifed Block Diagrams continued at end of data sheet.
________________________________________________________________ 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.