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19-1377; Rev 1; 9/05
Single/Dual/Quad, Low-Cost, SOT23,
Micropower Rail-to-Rail I/O Op Amps
________________General Description
The MAX4040–MAX4044 family of micropower op amps
operates from a single +2.4V to +5.5V supply or dual
±1.2V to ±2.75V supplies and have rail-to-rail input and
output capabilities. These amplifiers provide a 90kHz
gain-bandwidth product while using only 10µA of supply
current per amplifier. The MAX4041/MAX4043 have a
low-power shutdown mode that reduces supply current
to less than 1µA and forces the output into a high-imped-
ance state. The combination of low-voltage operation,
rail-to-rail inputs and outputs, and ultra-low power con-
sumption makes these devices ideal for any
portable/battery-powered system.
These amplifiers have outputs that typically swing to
within 10mV of the rails with a 100kload. Rail-to-rail
input and output characteristics allow the full power-
supply voltage to be used for signal range. The combi-
nation of low input offset voltage, low input bias current,
and high open-loop gain makes them suitable for low-
power/low-voltage precision applications.
The MAX4040 is offered in a space-saving 5-pin SOT23
package. All specifications are guaranteed over the
-40°C to +85°C extended temperature range.
________________________Applications
Battery-Powered
Systems
Portable/Battery-Powered
Electronic Equipment
Digital Scales
Strain Gauges
Sensor Amplifiers
Cellular Phones
Notebook Computers
PDAs
____________________________Features
Single-Supply Operation Down to +2.4V
Ultra-Low Power Consumption:
10µA Supply Current per Amplifier
1µA Shutdown Mode (MAX4041/MAX4043)
Rail-to-Rail Input Common-Mode Range
Outputs Swing Rail-to-Rail
No Phase Reversal for Overdriven Inputs
200µV Input Offset Voltage
Unity-Gain Stable for Capacitive Loads up to 200pF
90kHz Gain-Bandwidth Product
Available in Space-Saving 5-Pin SOT23 and
8-Pin µMAX® Packages
Ordering Information
PART
MAX4040EUK-T
MAX4040EUA
MAX4040ESA
MAX4041ESA
MAX4041EUA
MAX4042EUA
MAX4042ESA
MAX4043EUB
MAX4043ESD
MAX4044ESD
TEMP RANGE
PIN-
PACKAGE
-40°C to +85°C 5 SOT23-5
-40°C to +85°C 8 µMAX
-40°C to +85°C 8 SO
-40°C to +85°C 8 SO
-40°C to +85°C 8 µMAX
-40°C to +85°C 8 µMAX
-40°C to +85°C 8 SO
-40°C to +85°C 10 µMAX
-40°C to +85°C 14 SO
-40°C to +85°C 14 SO
SOT
TOP MARK
ACGF
Selector Guide
PART
MAX4040
MAX4041
MAX4042
MAX4043
MAX4044
NO. OF
AMPS
SHUTDOWN
1—
1 Yes
2—
2 Yes
4—
PIN-PACKAGE
5-pin SOT23,
8-pin µMAX/SO
8-pin µMAX/SO
8-pin µMAX/SO
10-pin µMAX/
14-pin SO
14-pin SO
µMAX is a registered trademark of Maxim Integrated Products, Inc.
TOP VIEW
Pin Configurations
OUT 1
5 VCC
MAX4040
VEE 2
IN+ 3
4 IN-
SOT23-5
Pin Configurations continued at end of data sheet.
________________________________________________________________ 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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Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC to VEE)..................................................+6V
All Other Pins ...................................(VCC + 0.3V) to (VEE - 0.3V)
Output Short-Circuit Duration to VCC or VEE ..............Continuous
Continuous Power Dissipation (TA = +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C).............571mW
8-Pin µMAX (derate 4.1mW/°C above +70°C) ..............330mW
8-Pin SO (derate 5.88mW/°C above +70°C).................471mW
10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW
14-Pin SO (derate 8.33mW/°C above +70°C)..............667mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS—TA = +25°C
(VCC = +5.0V, VEE = 0V, VCM = 0V, VOUT = VCC / 2, SHDN = VCC, RL = 100ktied to VCC / 2, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Supply-Voltage Range
Supply Current
per Amplifier
Shutdown Supply
Current per Amplifier
VCC
ICC
ICC(SHDN)
Inferred from PSRR test
VCC = 2.4V
VCC = 5.0V
SHDN = VEE, MAX4041
and MAX4043 only
Input Offset Voltage
Input Bias Current
Input Offset Current
Differential Input
Resistance
VOS
VEE VCM VCC
IB
IOS
RIN(DIFF)
(Note 1)
(Note 1)
VIN+ - VIN-< 1.0V
VIN+ - VIN-> 2.5V
VCC = 2.4V
VCC = 5.0V
MAX4044ESD
MAX404_EU_
All other packages
2.4 5.5 V
10
µA
14 20
1.0
µA
2.0 5.0
±0.20
±0.25
±2.0
±2.5
mV
±0.20 ±1.50 mV
±2 ±10 nA
±0.5 ±3.0
nA
45 M
4.4 k
Input Common-Mode
Voltage Range
VCM Inferred from the CMRR test
VEE
VCC
V
Common-Mode
Rejection Ratio
CMRR VEE VCM VCC
MAX404_EU_
All other packages
65 94
70 94
dB
Power-Supply
Rejection Ratio
PSRR 2.4V VCC 5.5V
75 85
dB
Large-Signal
Voltage Gain
AVOL (VEE + 0.2V) VOUT (VCC - 0.2V)
RL = 100k
RL = 25k
74
94
85
dB
Output Voltage
Swing High
VOH Specified as VCC - VOH
RL = 100k
RL = 25k
10
mV
60 90
Output Voltage
Swing Low
VOL Specified as VEE - VOL
RL = 100k
RL = 25k
10
mV
40 60
Output Short-Circuit
Current
Sourcing
IOUT(SC) Sinking
0.7
mA
2.5
Channel-to-Channel
Isolation
Specified at DC, MAX4042/MAX4043/MAX4044 only 80 dB
2 _______________________________________________________________________________________

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Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
ELECTRICAL CHARACTERISTICS—TA = +25°C (continued)
(VCC = +5.0V, VEE = 0V, VCM = 0V, VOUT = VCC / 2, SHDN = VCC, RL = 100ktied to VCC / 2, unless otherwise noted.)
PARAMETER
Output Leakage Current in
Shutdown
SHDN Logic Low
SHDN Logic High
SHDN Input Bias Current
Gain Bandwidth Product
Phase Margin
Gain Margin
Slew Rate
Input Voltage Noise Density
Input Current Noise Density
Capacitive-Load Stability
Power-Up Time
Shutdown Time
Enable Time from Shutdown
Input Capacitance
Total Harmonic Distortion
Settling Time to 0.01%
SYMBOL
CONDITIONS
IOUT(SHDN)
SHDN = VEE = 0, MAX4041/MAX4043 only
(Note 2)
VIL MAX4041/MAX4043 only
VIH MAX4041/MAX4043 only
IIH, IIL MAX4041/MAX4043 only
GBW
Φm
Gm
SR
en f = 1kHz
in f = 1kHz
AVCL = +1V/V, no sustained oscillations
tON
tSHDN MAX4041 and MAX4043 only
tEN MAX4041 and MAX4043 only
CIN
THD
fIN = 1kHz, VOUT = 2Vp-p, AV = +1V/V
tS AV = +1V/V, VOUT = 2VSTEP
MIN TYP MAX UNITS
20 100 nA
0.7 x VCC
0.3 x VCC
V
V
40 120 nA
90 kHz
68 degrees
18 dB
40 V/ms
70 nV/Hz
0.05 pA/Hz
200 pF
200 µs
50 µs
150 µs
3 pF
0.05 %
50 µs
ELECTRICAL CHARACTERISTICS—TA = TMIN to TMAX
(VCC = +5.0V, VEE = 0V, VCM = 0V, VOUT = VCC / 2, SHDN = VCC, RL = 100ktied to VCC / 2, unless otherwise noted.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Supply-Voltage Range
VCC Inferred from PSRR test
2.4 5.5 V
Supply Current
per Amplifier
ICC
28 µA
Shutdown Supply
Current per Amplifier
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Offset Current
ICC(SHDN)
VOS
TCVOS
IB
IOS
SHDN = VEE, MAX4041 and MAX4043 only
VEE VCM VCC
MAX4044ESA
MAX404_EU_
All other packages
(Note 1)
(Note 1)
6.0 µA
±4.5
±5.0 mV
±3.5
2 µV/°C
±20 nA
±8 nA
_______________________________________________________________________________________ 3

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Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
ELECTRICAL CHARACTERISTICS—TA = TMIN to TMAX (continued)
(VCC = +5.0V, VEE = 0V, VCM = 0V, VOUT = VCC / 2, SHDN = VCC, RL = 100ktied to VCC / 2, unless otherwise noted.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Input Common-Mode
Voltage Range
VCM Inferred from the CMRR test
VEE
VCC
V
Common-Mode
Rejection Ratio
CMRR VEE VCM VCC
MAX404_EU_
All other packages
60
65
dB
Power-Supply
Rejection Ratio
PSRR 2.4V VCC 5.5V
70 dB
Large-Signal Voltage
Gain
Output Voltage Swing
High
Output Voltage Swing
Low
AVOL (VEE + 0.2V) VOUT (VCC - 0.2V), RL = 25k
VOH Specified as VCC - VOH, RL = 25k
VOL Specified as VEE - VOL, RL = 25k
68
dB
125 mV
75 mV
Note 1: Input bias current and input offset current are tested with VCC = +5.0V and +0.5V VCM +4.5V.
Note 2: Tested for VEE VOUT VCC. Does not include current through external feedback network.
Note 3: All devices are 100% tested at TA = +25°C. All temperature limits are guaranteed by design.
__________________________________________Typical Operating Characteristics
(VCC = +5.0V, VEE = 0, VCM = VCC / 2, SHDN = VCC, RL = 100kto VCC / 2, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT PER AMPLIFIER
vs. TEMPERATURE
20
18
16 VCC = +5.5V
14
12
10
8 VCC = +2.4V
6
4
2
0
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
MAX4041/MAX4043
SHUTDOWN SUPPLY CURRENT
PER AMPLIFIER vs. TEMPERATURE
5
SHDN = 0
4
3
VCC = +5.5V
2
VCC = +2.4V
1
0
-60 -40 -20 0 20 40 60
TEMPERATURE (°C)
80 100
4 _______________________________________________________________________________________

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Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
Typical Operating Characteristics (continued)
(VCC = +5.0V, VEE = 0, VCM = VCC / 2, SHDN = VCC, RL = 100kto VCC / 2, TA = +25°C, unless otherwise noted.)
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
400
300
INPUT BIAS CURRENT
INPUT BIAS CURRENT vs.
vs. TEMPERATURE
COMMON-MODE VOLTAGE (VCC = 2.4V)
0 5.0
VCM = 0
VCC = +2.4V
VCC = +2.4V
-1 2.5
200
-2
VCC = +5.5V
0
100 -3 -2.5
0
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
-4 -5.0
-60 -40 -20 0 20 40 60 80 100
0 0.2 0.6 1.0 1.4 1.8 2.2
TEMPERATURE (°C)
VCM (V)
INPUT BIAS CURRENT vs.
COMMON-MODE VOLTAGE (VCC = 5.5V)
5.0
VCC = +5.5V
2.5
OUTPUT SWING HIGH
vs. TEMPERATURE
120
RL TO VEE
100
80 VCC = +2.4V, RL = 10k
0
-2.5
-5.0
0 0.5 1.5 2.5
3.5 4.5
5.5
VCM (V)
60 VCC = +5.5V, RL = 20k
40
VCC = +5.5V, RL = 100k
20
VCC = +2.4V, RL = 100k
0
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
OUTPUT SWING LOW
vs. TEMPERATURE
120
RL TO VCC
100
80
60
VCC = +5.5V, RL = 20k
40
VCC = +2.4V, RL = 10k
20 VCC = +5.5V, RL = 100k
VCC = +2.4V, RL = 100k
0
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
COMMON-MODE REJECTION
vs. TEMPERATURE
-80
-85
-90 VCC = +2.4V
-95 VCC = +5.5V
-100
-60 -40 -20 0 20 40 60
TEMPERATURE (°C)
80 100
_______________________________________________________________________________________ 5