General Description

The MAX4364/MAX4365 are bridged audio power

amplifiers intended for portable audio devices with

internal speakers. The MAX4364 is capable of deliver-

ing 1.4W from a single 5V supply and 500mW from a

single 3V supply into an 8

Ω load. The MAX4365 is

capable of delivering 1W from a single 5V supply and

450mW from a single 3V supply into an 8

Ω load. The

MAX4364/MAX4365 feature 0.04% THD + N at 1kHz,

68dB PSRR at 217Hz and only 10nA of supply current

in shutdown mode.

The MAX4364/MAX4365 bridged outputs eliminate the

need for output-coupling capacitors, minimizing exter-

nal component count. The MAX4364/MAX4365 also

include internal DC bias generation, clickless operation,

short-circuit and thermal-overload protection. Both

devices are unity-gain stable, with the gain set by two

external resistors.

The MAX4364 is available in a small 8-pin SO package.

The MAX4365 is available in tiny 8-pin thin QFN

Applications

Cellular Phones

PDAs

Two-Way Radios

General-Purpose Audio

Features

o 1.4W into 8Ω Load (MAX4364)

o 1W into 8Ω Load (MAX4365)

o 0.04% THD + N at 1kHz

o 68dB PSRR at 217Hz

o 2.7V to 5.5V Single-Supply Operation

o 5mA Supply Current

o Low-Power, 10nA Shutdown Mode

o Pin Compatible with the LM4861/LM4862/LM4864

(MAX4364)

o Clickless Power-Up and Shutdown

o Thermal-Overload and Short-Circuit Protection

o Available in Thin QFN, µMAX, and SO Packages

1.4W and 1W, Ultra-Small, Audio Power

Amplifiers with Shutdown

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

19-2387; Rev 1; 10/02

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.

PART

TEMP RANGE

PIN-PACKAGE

TOP

MARK

MAX4364ESA

-40°C to +85°C

8 SO

—

MAX4365EUA

-40°C to +85°C

8 µMAX

—

MAX4365ETA

-40°C to +85°C

8 Thin QFN-EP*

ACD

6

2

3

4

1

8

5

7

OUT-

IN-

IN+

BIAS

50k

Ω

50k

Ω

10k

Ω

10k

Ω

AUDIO

INPUT

CLICKLESS/POPLESS

SHUTDOWN CONTROL

GND

SHDN

OUT+

MAX4364

Typical Application Circuit/Functional Diagram

Pin Configurations appear at end of data sheet.

*EP = Exposed paddle.