MAXIM MAX9709 25W 50W, Filterless, Spread-Spectrum, Stereo/Mono, Class-D Amplifier User Manual

19-3769; Rev 0; 9/05

EVALUATION KIT AVAILABLE

25W/50W, Filterless, Spread-Spectrum,

Stereo/Mono, Class D Amplifier General Description Features

The MAX9709 stereo/mono, Class D audio power amplifi- 2 x 25W Output Power in Stereo Mode er delivers up to 2 x 25W into an 8Ω stereo mode and (8Ω, THD = 10%) 1 x 50W into a 4Ω load in mono mode while offering up to

1 x 50W Output Power in Mono Mode

87% efficiency. The MAX9709 provides Class AB amplifi-

(4Ω, THD = 10%)

er performance with the benefits of Class D efficiency,

High Efficiency: Up to 87%

eliminating the need for a bulky heatsink and conserving

power. The MAX9709 operates from a single +10V to Filterless Class D Amplifier

+22V supply, driving the load in a BTL configuration. Unique Patented Spread-Spectrum Mode

The MAX9709 offers two modulation schemes: a fixed-fre- Programmable Gain (+22d B, +25d B, +29.5d B, quency modulation (FFM) mode, and a spread-spectrum +36d B)

modulation (SSM) mode that reduces EMI-radiated emis-

High PSRR (90d B at 1k Hz)

sions. The MAX9709 can be synchronized to an external

Differential Inputs Suppress Common-Mode

clock from 600k Hz to 1.2MHz. A synchronized output

Noise

allows multiple units to be cascaded in the system.

Shutdown and Mute Control

Features include fully differential inputs, comprehensive

Integrated Click-and-Pop Suppression

click-and-pop suppression, and four selectable-gain set-

tings (22d B, 25d B, 29.5d B, and 36d B). A pin-program- Low 0.1% THD+N

mable thermal flag provides seven different thermal Current Limit and Thermal Protection warning thresholds. Short-circuit and thermal-overload

Programmable Thermal Flag

protection prevent the device from being damaged

Clock Synchronization Input and Output

during a fault condition.

Available in Thermally Efficient, Space-Saving

The MAX9709 is available in 56-pin TQFN (8mm x 8mm

Packages: 56-Pin TQFN and 64-Pin TQFP

x 0.8mm) and 64-pin TQFP (10mm x 10mm x 1.4mm) packages, and is specif ied over the extended

Ordering Information

-40°C to +85°C temperature range.

Applications PART TEMP RANGE PIN-PACKAGE

LCD TVs PDP TVs

MAX9709ETN+ -40°C to +85°C 56 TQFN-EP** T5688-3

Automotive PC/Hi Fi Audio Solutions MAX9709ECB+* -40°C to +85°C 64 TQFP-EP** C64E-6

+Denotes lead-free package. *Future product—Contact factory for availability. **EP = Exposed paddle.Pin Configurations appear at end of data sheet.

Simplified Block Diagram

MAX9709 SYNCOUT MAX9709 SYNCOUT

FS1, FS2 FS1, FS2 SYNC SYNC

CHANNEL

AUDIO

CLASS D CLASS D

INPUT

MODULATOR MODULATOR

CHANNEL

GAIN VDIGITAL

OUTPUT OUTPUT

CONTROL

MONO CONTROL

PROTECTION PROTECTION

G1, G2 G1, G2 TH0, TH1, TH0, TH1,

TH2 TEMP

TH2 TEMP

STEREO MODE MONO MODE

Maxim Integrated Products

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.