General Description

The single MAX4036/MAX4037 and dual MAX4038/

MAX4039 operational amplifiers operate from a single

+1.4V to +3.6V (without reference) or +1.8V to +3.6V (with

reference) supply and consume only 800nA of supply

current per amplifier, and 1.1µA for the optional refer-

ence. The MAX4036/MAX4038 feature a common-mode

The MAX4037/MAX4039 feature a 1.232V voltage refer-

ence capable of sourcing 100µA and sinking 20µA.

The MAX4036–MAX4039s’ rail-to-rail outputs drive 5k

Ω

loads to within 25mV of the rails. Ultra-low supply current,

low operating voltage, and rail-to-rail outputs make the

MAX4036–MAX4039 ideal for use in single-cell lithium-ion

(Li+), or two-cell NiCd/NiMH/alkaline battery-powered

applications.

The MAX4036 is available in an SC70 package, the

MAX4037 in a SOT23 package, and the MAX4038/

devices are specified over the -40°C to +85°C extended

temperature range.

Applications

Battery-Powered/Solar-Powered Systems

Portable Medical Instrumentation

Pagers and Cell Phones

Micropower Thermostats and Potentiostats

Electrometer Amplifiers

Remote Sensor Amplifiers

Active Badges

pH Meters

Features

♦ Ultra-Low 800nA per Amplifier Supply Current

♦ Ultra-Low 1.4V Supply Voltage Operation (1.8V for

MAX4037/MAX4039)

♦ Rail-to-Rail Outputs Drive 5kΩ and 5000pF Load

♦ 1.232V ±0.5%, 120ppm/°C (max) Reference

(MAX4037/MAX4039)

♦ No External Reference Bypass Capacitor

Required

♦ No Phase Reversal for Overdriven Inputs

♦ Low 1.0pA (typ) Input Bias Current

♦ Low 200µV Input Offset Voltage

♦ Unity-Gain Stable

♦ Available in Tiny UCSP, SC70, SOT23, TDFN, and

µMAX Packages

with +1.2V Buffered Reference

________________________________________________________________ Maxim Integrated Products

1

INA+

SENSOR

REF

THREE-ELECTRODE POTENTIOSTAT APPLICATION

INB+

OUTA

INB-

OUTB

INA-

MAX4039

3V

ADC

Typical Operating Circuit

Ordering Information

MAX4039

OUTA

REF

INA-

INA+

OUTB

INB-

INB+

REF

Functional Diagram

19-3142; Rev 2; 11/04

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.

*EP = Exposed paddle.

µMAX is a registered trademark and UCSP is a trademark of

Maxim Integrated Products, Inc.

PART

TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX4036EXK-T

-40°C to +85°C

5 SC70-5

AFR

MAX4037EUT-T

-40°C to +85°C

6 SOT23-6

ABRX

MAX4038ETA

-40°C to +85°C

8 TDFN-EP*

AGO

MAX4038EUA

-40°C to +85°C

8 µMAX

—

MAX4038EBL-T

-40°C to +85°C

9 UCSP-9

AEG

MAX4039EBL-T

-40°C to +85°C

9 UCSP-9

AEH

MAX4039ETB

-40°C to +85°C

10 TDFN-EP*

AAN

MAX4039EUB

-40°C to +85°C

10 µMAX

—

Pin Configurations and Selector Guide appear at end of

data sheet.