General Description

The MAX4465–MAX4469 are micropower op amps opti-

mized for use as microphone preamplifiers. They pro-

vide the ideal combination of an optimized gain

bandwidth product vs. supply current, and low voltage

operation in ultra-small packages. The MAX4465/

MAX4467/MAX4469 are unity-gain stable and deliver a

200kHz gain bandwidth from only 24µA of supply cur-

rent. The MAX4466/MAX4468 are decompensated for a

minimum stable gain of +5V/V and provide a 600kHz

gain bandwidth product. In addition, these amplifiers

feature Rail-to-Rail® outputs, high AVOL, plus excellent

power-supply rejection and common-mode rejection

ratios for operation in noisy environments.

The MAX4467/MAX4468 include a complete shutdown

mode. In shutdown, the amplifiers’ supply current is

reduced to 5nA and the bias current to the external

microphone is cut off for ultimate power savings. The

single MAX4465/MAX4466 are offered in the ultra-small

5-pin SC70 package, while the single with shutdown

MAX4467/MAX4468 and dual MAX4469 are available in

the space-saving 8-pin SOT23 package.

Applications

Microphone Preamplifiers

Hearing Aids

Cellular Phones

Voice-Recognition Systems

Digital Dictation Devices

Headsets

Portable Computing

Features

o +2.4V to +5.5V Supply Voltage Operation

o Versions with 5nA Complete Shutdown Available

(MAX4467/MAX4468)

o Excellent Power-Supply Rejection Ratio: 112dB

o Excellent Common-Mode Rejection Ratio: 126dB

o High AVOL: 125dB (RL = 100kΩ)

o Rail-to-Rail Outputs

o Low 24µA Quiescent Supply Current

o Gain Bandwidth Product:

200kHz (MAX4465/MAX4467/MAX4469)

600kHz AV ≥ 5 (MAX4466/MAX4468)

o Available in Space-Saving Packages

5-Pin SC70 (MAX4465/MAX4466)

8-Pin SOT23 (MAX4467/MAX4468/MAX4469)

Low-Cost, Micropower, SC70/SOT23-8, Microphone

Preamplifiers with Complete Shutdown

19-1950; Rev 2; 6/12

1

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX4465EXK+T

-40°C to +85°C

5 SC70

MAX4465EUK+T

-40°C to +85°C

5 SOT23

MAX4466EXK+T

-40°C to +85°C

5 SC70

MAX4466EUK+T

-40°C to +85°C

5 SOT23

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.

Ordering Information continued at end of data sheet.

TOP VIEW

GND

OUT

IN-

1

+

5

VCC

IN+

MAX4465

MAX4466

SC70/SOT23

2

3

4

Pin Configurations

Typical Operating Circuit

MAX4467

MAX4468

GND

MICROPHONE

CAPSULE

MAX4467/MAX4468 TYPICAL OPERATING CIRCUIT WITH

COMPLETE SHUTDOWN

RBIAS

RFB

VCC

OUT

IN+

IN-

SHDN

CBIAS

RBIAS

RDC

MIC_BIAS

RIN

CIN

CBYPASS

RDC

Pin Configurations continued at end of data sheet.

+

Denotes a lead(Pb)-free/RoHS-compliant package.