General Description

The MAX4295 mono, switch-mode (Class D) audio

power amplifier operates from a single +2.7V to +5.5V

supply. The MAX4295 has >85% efficiency and is

capable of delivering 2W continuous power to a 4

Ω

load, making it ideal for portable multimedia and gener-

al-purpose high-power audio applications.

The MAX4295 features a total harmonic distortion plus

noise (THD+N) of 0.4% (fOSC = 125kHz), low quiescent

current of 2.8mA, high efficiency, and clickless power-

up and shutdown. The SHDN input disables the device

and limits supply current to <1.5µA. Other features

include a 1A current limit, thermal protection, and

undervoltage lockout.

The MAX4295 reduces the number of required external

components. Internal high-speed power-MOS transis-

tors allow operation as a bridge-tied load (BTL) amplifi-

er. The BTL configuration eliminates the need for

isolation capacitors on the output. The frequency-selec-

table pulse-width modulator (PWM) allows the user to

optimize the size and cost of the output filter.

The MAX4295 is offered in a space-saving 16-pin

QSOP or narrow SO package.

Applications

Features

♦ +2.7V to +5.5V Single-Supply Operation

♦ 2W/Channel Output Power at 5V

0.7W/Channel Output Power at 3V

♦ 87% Efficiency (RL = 4Ω, POUT = 2W)

♦ 0.4% THD+N (RL = 4Ω, fOSC = 125kHz)

♦ Logic-Programmable PWM Frequency Selection

(125kHz, 250kHz, 500kHz, 1MHz)

♦ Low-Power Shutdown Mode

♦ Clickless Transitions Into and Out of Shutdown

♦ 1A Current Limit and Thermal Protection

♦ Available in Space-Saving Packages

16-Pin QSOP or Narrow SO

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.

Mono, 2W, Switch-Mode (Class D)

Audio Power Amplifier

________________________________________________________________ Maxim Integrated Products

1

AOUT

IN

VCC

GND

VCM

ON

OFF

SHDN

FS1

FS2

OUT+

OUT-

PVCC

AUDIO

INPUT

2.7V TO 5.5V

2.7V TO 5.5V

RF

RIN

CIN

GND

MAX4295

PVCC

PGND

PGND

SS

19-1746; Rev 3; 3/05

Ordering Information

Palmtop/Notebook

Computers

PDA Audio

Sound Cards

Game Cards

Boom Boxes

AC Amplifiers

Battery-Powered Speakers

Cordless Phones

Portable Equipment

Pin Configuration appears at end of data sheet.

Typical Operating Circuit

PART

TEMP RANGE

PIN-PACKAGE

MAX4295EEE

-40°C to +85°C

16 QSOP

MAX4295ESE

-40°C to +85°C

16 Narrow SO