MAX4036_09 Datasheet, PDF (1/22 Pages) Maxim Integrated Products – Low IBIAS, +1.4V/800nA, Rail-to-Rail Op Amps with +1.2V Buffered Reference

19-3142; Rev 5; 11/09
Low I_BIAS, +1.4V/800nA, Rail-to-Rail Op Amps
with +1.2V Buffered Reference
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
input voltage range from 0V to V_DD - 0.4V at V_DD = 1.4V.
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 5kΩ
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/
MAX4039 in UCSP™, µMAX^®, and TDFN packages.
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
Pin Configurations and Selector Guide appear at end of
data sheet.
µMAX is a registered trademark and UCSP is a trademark of
Maxim Integrated Products, Inc.
Functional Diagram
OUTA
MAX4039
INA-
INA+
REF
REF
VSS
VDD
OUTB
INB-
INB+
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
♦ Available in -40°C to +125°C Temperature Range
(MAX4036A/MAX4038A)
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
TOP
MARK
MAX4036EXK-T -40°C to +85°C 5 SC70
AFR
MAX4036AAXK+T -40°C to +125°C 5 SC70
ASN
MAX4037EUT-T -40°C to +85°C 6 SOT23
ABRX
MAX4038ETA-T -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
AEG
MAX4038AAUA -40°C to +125°C 8 µMAX
—
+Denotes a lead(Pb)-free/RoHS-compliant package.
-Denotes a package containing lead.
*EP = Exposed pad.
Ordering Information continued at end of data sheet.
Typical Operating Circuit
3V
V_DD
INA-
OUTA
INA+ _MAX4039
REF
INB-
INB+
OUTB
V_SS
SENSOR
ADC
THREE-ELECTRODE POTENTIOSTAT APPLICATION
________________________________________________________________ Maxim Integrated Products 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.