MAX9742 查看數據表（PDF） - Maxim Integrated

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MAX9742

Single-/Dual-Supply, Stereo 16W, Class D Amplifier with Differential Inputs

Maxim Integrated 

19-0731; Rev 0; 1/07

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Single-/Dual-Supply, Stereo 16W,

Class D Amplifier with Differential Inputs

General Description

The MAX9742 stereo Class D audio power amplifier

delivers up to 2 x 16W into 4Ω loads. The MAX9742

features high-power efficiency (92% with 8Ω loads),

eliminating the need for a bulky heatsink and conserv-

ing power. The MAX9742 operates from a 20V to 40V

single supply or a ±10V to ±20V dual supply. Features

include fully differential inputs, comprehensive click-

and-pop suppression, low-power shutdown mode, and

an externally adjustable gain. Short-circuit and thermal-

overload protection prevent the device from being

damaged during a fault condition.

The MAX9742 is available in a thermally efficient 36-pin

TQFN (6mm x 6mm x 0.8mm) package and is specified

over the -40°C to +85°C extended temperature range.

CRT TVs

Flat-Panel Display TVs

Audio Docking Stations

Multimedia Monitors

Applications

Features

o 2 x 16W Output Power (RL = 4Ω, THD+N = 10%)

o High Efficiency: Up to 92% with RL = 8Ω

o Mute and Shutdown Modes

o Differential Inputs Suppress Common-Mode Noise

o Adjustable Gain

o Integrated Click-and-Pop Suppression

o Low 0.06% THD+N at 3.5W, RL = 8Ω

o Output Short-Circuit and Thermal Protection

o Available in Space-Saving, 6mm x 6mm, 36-Pin

TQFN Package

Ordering Information

PART

TEMP RANGE PIN-PACKAGE

PKG

CODE

MAX9742ETX+ -40°C to +85°C

+Denotes lead-free package.

*EP = Exposed paddle.

36 TQFN-EP*

T3666-3

Pin Configuration located at end of data sheet.

Simplified Block Diagrams

SINGLE-SUPPLY CONFIGURATION

RF1

CFBL

20V TO 40V

CIN

RIN1

LEFT NEGATIVE

INL-

AUDIO INPUT

CIN

LEFT POSITIVE

RIN2

INL+

AUDIO INPUT

RF2 CFBL

VDD

MID

2

RF2 CFBR

CIN

RIGHT POSITIVE

RIN2

INR+

AUDIO INPUT

CIN

RIGHT NEGATIVE

RIN1

INR-

AUDIO INPUT

FBL VDD

MAX9742

CLASS D

MODULATOR AND

HALF-BRIDGE

OUTL

CLASS D

MODULATOR AND

HALF-BRIDGE

OUTR

CONTROL LOGIC/

POWER-UP

SEQUENCING

FBR

VSS SHDN SFT

CFBR

ON

CSFT

RF1

OFF

Simplified Block Diagrams continued at end of data sheet.

LF

COUT

RZBL

CF

CZBL

LF

COUT

RZBL

CF

CZBL

________________________________________________________________ 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.

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