19-1612; Rev 3; 4/02


Ultra-Small, 1 .8 V, µ Pow er, Rail-to-Rail I /O Op Amps

MAX4291 /MAX4292 /MAX4294

General Description Features

The MAX4291/MAX4292/MAX4294 family of micropow- er operational amplifiers operates from a 1.8V to 5.5V single supply or ± 0.9V to ± 2.75V dual supplies and has Rail-to-Rail® input/output capabilities. These amplifiers provide a 500kHz gain-bandwidth product and 120dB open-loop voltage gain while using only 100µA of sup- ply current per amplifier. The combination of low input offset voltage (± 200µV) and high open-loop gain makes them ideal for low-power/low-voltage, high-precision portable applications.

The MAX4291/MAX4292/MAX4294 have an input com- mon-mode range that extends to each supply rail, and their outputs swing to within 46mV of the rails with a 2k load. Although the minimum operating voltage is speci- fied at 1.8V, these devices typically operate down to 1.5V. The combination of ultra-low-voltage operation, rail- to-rail inputs/output, and low-power consumption makes these devices ideal for any portable/two-cell battery-pow- ered system.

The single MAX4291 is offered in an ultra-small 5-pin SC70 package. The dual MAX4292 is offered in a space-saving 8-bump, 1.5mm X 1.5mm footprint, ultra chip-scale package (UCSP™).

Applications

2-Cell Battery-Operated Systems Portable Electronic Equipment Battery-Powered Instrumentation Digital Scales

Strain Gauges Sensor Amplifiers Cellular Phones

TOPVIEW (BUMPSONBOTTOM)

OUTA VCC OUTB


INA- MAX4292 INB-


INA+ VEE INB+


UCSP


Pin Configurations continued at end of data sheet.

Pin Configurations

Ultra-Low Voltage Operation—Guaranteed Down to 1.8V

100µA Supply Current per Amplifier 500kHz Gain-Bandwidth Product

120dB Open-Loop Voltage Gain (RL = 100k)

0.017% Total Harmonic Distortion Plus Noise (THD + N) at 1kHz

Rail-to-Rail Input Common-Mode Range Rail-to-Rail Output Drives 2k Load

No Phase Reversal for Overdriven Inputs

Unity-Gain Stable for Capacitive Loads up to 100pF 200µV Input Offset Voltage (MAX4292/MAX4294) Single in Small 5-Pin SC70

Available in Ultra-Small Packages: 5-Pin SC70 (MAX4291)

8-Bump UCSP (MAX4292)

Ordering Information


PART

TEMP RANGE

PIN- PACKAGE

TOP MARK

MAX4291EXK-T

-40C to +85C

5 SC70-5

AAD

MAX4291EUK-T

-40C to +85C

5 SOT23-5

ADML

MAX4292EBL-T*

-40C to +85C

8 UCSP-8

AAJ

MAX4292EUA

-40C to +85C

8 µMAX

MAX4292ESA

-40C to +85C

8 SO

MAX4294ESD

-40C to +85C

14 SO

MAX4294EUD

-40C to +85C

14 TSSOP

*UCSP reliability is integrally linked to the user’s assembly methods, circuit board material, and environment. Refer to the UCSP Reliability Notice in the UCSP Reliability section of this data sheet for more information.


Selector Guide


PART

AMPLIFIERS

PIN-PACKAGE

MAX4291

1

5-pin SC70/SOT23

MAX4292

2

8-pin µMAX/SO/UCSP

MAX4294

4

14-pin SO/TSSOP


Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. UCSP is a trademark of Maxim Integrated Products, Inc.


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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Maxim Integrated:

MAX4291EUK+T MAX4291EUK-T MAX4291EXK+T MAX4291EXK-T MAX4292ESA MAX4292ESA+ MAX4292ESA+T MAX4292EUA MAX4292EUA+ MAX4292EUA+T MAX4294ESD+ MAX4294ESD+T MAX4294EUD+ MAX4294EUD+T MAX4292ESA-T MAX4292EUA-T MAX4292EBL-T MAX4292EBL+T