General Description

The MAX9718/MAX9719 differential input audio power

amplifiers are ideal for portable audio devices with

internal speakers. The differential input structure

improves noise rejection and provides common-mode

rejection. A bridge-tied load (BTL) architecture mini-

mizes external component count, while providing high-

quality, power audio amplification. The MAX9718 is a

single-channel amplifier while the MAX9719 is a dual-

channel amplifier for stereo systems. Both devices

deliver 1.4W continuous average power per channel to

a 4

Ω load with less than 1% THD+N while operating

from a single +5V supply. The devices are available as

adjustable gain amplifiers or with internally fixed gains

of 0dB, 3dB, and 6dB to reduce component count.

A shutdown input disables the bias generator and

amplifiers and reduces quiescent current consumption

to less than 100nA. The MAX9718 shutdown input can

be set as active high or active low. These devices fea-

ture Maxim’s comprehensive click-and-pop suppres-

sion circuitry that reduces audible clicks and pops

during startup and shutdown.

The MAX9718 is pin compatible with the LM4895,

and is available in 9-bump UCSP™, 10-pin TDFN, and

10-pin µMAX packages. The MAX9719 is available in

16-pin TQFN, 16-pin TSSOP, and 16-bump UCSP pack-

ages. Both devices operate over the -40°C to +85°C

extended temperature range.

Applications

Mobile Phones

PDAs

Portable Devices

Features

o 2.7V to 5.5V Single-Supply Operation

o Very High -93dB PSRR at 217Hz

o 1.4W into 4Ω at 1% THD+N (per Channel)

o Differential Input

o Internal Fixed Gain to Reduce Component Count

o Adjustable Gain Option (MAX9718A/MAX9719A)

o 100nA Low-Power Shutdown Mode

o No Audible Clicks or Pops at Power-Up/Down

o Improved Performance Pin-Compatible Upgrade

to LM4895 (MAX9718D)

Low-Cost, Mono/Stereo,

1.4W Differential Audio Power Amplifiers

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

MAX9719

SINGLE SUPPLY

2.7V TO 5.5V

SHDN

INL+

INL-

INR+

INR-

MAX9718

SINGLE SUPPLY

2.7V TO 5.5V

SHDM

SHDN

IN+

OUT+

OUT-

OUTR-

OUTR+

OUTL-

OUTL+

IN-

Simplified Block Diagram

19-3050; Rev 0; 10/03

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.

Ordering Information continued at end of data sheet.

Pin Configurations appear at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

PART

TEMP

RANGE

PIN-

PACKAGE

GAIN

(dB)

MAX9718AEBL-T* -40°C to +85°C 3 x 3 UCSP

Adj

MAX9718AETB*

-40°C to +85°C 10 TDFN-EP**

Adj

MAX9718AEUB

-40°C to +85°C 10 µMAX-EP**

Adj

*Future product—contact factory for availability.

**EP = Exposed paddle.