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MAX4291/MAX4292/MAX4294
Ultra-Small, +1.8V, Power,
Rail-to-Rail I/O Op Amps
________________________________________________________________ Maxim Integrated Products
1
V
EE
OUT
IN-
1
5 V
CC
IN+
SC70-5/SOT23-5
TOP VIEW
2
3
4
V
EE
OUTB
OUTA
INB-
INB+
V
CC
INA+
INA-
MAX/SO
1
2
8
7
3
4
6
5
MAX4292
MAX4291
19-1612; Rev 0; 3/00
Pin Configurations
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
8 MAX
5 SOT23-5
5 SC70-5
PIN-
PACKAGE
TEMP. RANGE
-40C to +85C
-40C to +85C
-40C to +85C
MAX4292EUA*
MAX4291EUK-T
MAX4291EXK-T
PART
Ordering Information
Selector Guide
--
ADML
AAD
TOP
MARK
14 TSSOP
14 SO
8 SO
-40C to +85C
-40C to +85C
-40C to +85C
MAX4294EUD*
MAX4294ESD*
MAX4292ESA*
--
--
--
Pin Configurations continued at end of data sheet.
14-pin SO/TSSOP
8-pin MAX/SO
5-pin SC70/SOT23
PIN-PACKAGE
AMPLIFIERS
PER PACKAGE
1
2
4
MAX4294
MAX4292
MAX4291
PART
General Description
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
100A of supply current per amplifier. The combination
of low input offset voltage (400V) and high-open-loop
gain makes them suitable for low-power/low-voltage
high-precision applications.
The MAX4291/MAX4292/MAX4294 have an input com-
mon-mode range that extends to each supply rail, and
their outputs typically swing within 20mV of the rails with
a 2k
load. Although the minimum operating voltage is
specified 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 bat-
tery-powered system.
The single MAX4291 is offered in an ultra-small 5-pin
SC70 package and the dual MAX4292 is offered in a
space-saving 8-pin MAX package.
Applications
2-Cell Battery-Operated Systems
Portable Electronic Equipment
Battery-Powered Instrumentation
Digital Scales
Strain Gauges
Sensor Amplifiers
Cellular Phones
Features
o Ultra-Low Voltage Operation--Guaranteed Down
to +1.8V
o 100A Supply Current per Amplifier
o 500kHz Gain-Bandwidth Product
o 120dB Open-Loop Voltage Gain (R
L
= 100k
)
o 0.017% THD + Noise at 1kHz
o Rail-to-Rail Input Common-Mode Range
o Rail-to-Rail Output Drives 2k Load
o No Phase Reversal for Overdriven Inputs
o Unity-Gain Stable for Capacitive Loads up to 100pF
o 400V Input Offset Voltage
o Single Available in Ultra-Small 5-Pin SC70
Dual Available in Space-Saving 8-Pin MAX
*Future product--contact factory for availability.
MAX4291/MAX4292/MAX4294
Ultra-Small, +1.8V, Power,
Rail-to-Rail I/O Op Amps
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +1.8V to +5.5V, V
EE
= V
CM
= 0, V
OUT
= V
CC
/ 2, R
L
= 100k
connected to V
CC
/ 2, T
A
= +25C, unless otherwise noted.)
(Note 1)
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.
Supply Voltage (V
CC
to V
EE)
..................................................+6V
All Other Pins ...................................(V
CC
+ 0.3V) to (V
EE
- 0.3V)
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (T
A
= +70C)
5-Pin SC70 (derate 2.5mW/C above +70C) ................200mW
5-Pin SOT23 (derate 7.1mW/C above +70C)................571mW
8-Pin MAX (derate 4.10mW/C above +70C)..............330mW
8-Pin SO (derate 5.88mW/C above +70C) ..................471mW
14-Pin SO (derate 8.33mW/C above +70C) ................667mW
14-Pin TSSOP (derate 6.3mW/C above +70C) ............500mW
Operating Temperature Range............................-40C to +85C
Junction Temperature ......................................................+150C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10s) .................................+300C
80
100
80
100
MAX4292ESA, MAX4294ESD
MAX4292EUA, MAX4294EUD
MAX4291EXK, MAX4291EUK
MAX4292ESA, MAX4294ESD
MAX4292EUA, MAX4294EUD
MAX4291EXK, MAX4291EUK
70
90
70
90
Tested for
0
V
CM
5.0V,
V
CC
= 5.0V
dB
60
90
65
85
65
85
Common-Mode Rejection Ratio
CMRR
Tested for
0
V
CM
1.8V;
V
CC
= 1.8V
dB
50
80
Power-Supply Rejection Ratio
PSRR
dB
80
100
MAX4291EXK, MAX4291EUK
V
OS
110
225
V
CC
= 5.0V
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
Input Bias Current
I
B
15
55
nA
400
1500
400
1500
Input Offset Voltage
400
2500
V
Input Offset Current
I
OS
1
7
nA
Differential Input Resistance
R
IN
0.75
M
Input Common-Mode Voltage
Range
V
CM
0
V
CC
V
Quiescent Supply Current
(per Amplifier)
Supply Voltage Range
V
CC
1.8
5.5
V
I
Q
100
210
A
CONDITIONS
V
CC
= 5.0V, 0
V
CM
5.0V
MAX4292ESA, MAX4294ESD
MAX4292EUA, MAX4294EUD
MAX4291EXK, MAX4291EUK
V
CC
= 5.0V, 0
V
CM
5.0V
|V
IN+
- V
IN-
| < 10mV
Inferred from CMRR test
Inferred from PSRR test
V
CC
= 1.8V
MAX4292ESA, MAX4294ESD
MAX4292EUA, MAX4294EUD
MAX4291/MAX4292/MAX4294
Ultra-Small, +1.8V, Power,
Rail-to-Rail I/O Op Amps
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS
(V
CC
= +1.8V to +5.5V, V
EE
= V
CM
= 0, V
OUT
= V
CC
/ 2, R
L
= 100k
connected to V
CC
/ 2, T
A
= T
MIN
to T
MAX
, unless otherwise
noted.) (Note 1)
ELECTRICAL CHARACTERISTICS
(V
CC
= +1.8V to +5.5V, V
EE
= V
CM
= 0, V
OUT
= V
CC
/ 2, R
L
= 100k
connected to V
CC
/ 2, T
A
= +25C, unless otherwise noted.)
(Note 1)
Channel-to-Channel Isolation
Gain Bandwidth Product
Phase Margin
Gain Margin
Slew Rate
Input Voltage Noise Density
Input Current Noise Density
Capacitive-Load Stability
CHISO
GBW
M
G
M
SR
e
n
i
n
Specified at f = 10kHz (MAX4292/MAX4294 only)
f = 10kHz
f = 10kHz
A
VCL
= +1V/V, no sustained oscillations
100
500
65
12
0.2
70
0.05
100
pF
pA/
Hz
nV/
Hz
V/s
dB
degrees
kHz
dB
mA
20
Sourcing or sinking
I
OUT(SC)
Output Short-Circuit Current
Output Voltage Swing Low
V
OL
Specified as
|V
EE
V
OL
|
R
L
= 2k
to V
CC
/ 2
R
L
= 100k
to V
CC
/ 2
18
40
3
15
mV
mV
15
40
2
20
R
L
= 2k
to V
CC
/ 2
R
L
= 100k
to V
CC
/ 2
Specified as
|V
CC
V
OH
|
V
OH
Output Voltage Swing High
Large-Signal Voltage Gain
A
V
V
CC
= 5.0V
V
CC
= 1.8V
R
L
= 100k
,
0.015V
V
OUT
V
CC
- 0.015V
R
L
= 2k
,
0.1V
V
OUT
V
CC
- 0.1V
R
L
= 100k
,
0.015V
V
OUT
V
CC
- 0.015V
R
L
= 2k
,
0.1V
V
OUT
V
CC
- 0.1V
80
120
80
130
80
110
80
120
dB
UNITS
MIN
TYP
MAX
CONDITIONS
SYMBOL
PARAMETER
270
V
CC
= 5.0V
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
1500
1500
Input Offset Voltage
V
OS
3000
V
Quiescent Supply Current
(per Amplifier)
Supply Voltage Range
V
CC
1.8
5.5
V
I
Q
240
A
CONDITIONS
MAX4292ESA, MAX4294ESD
MAX4292EUA, MAX4294EUD
MAX4291EXK, MAX4291EUK
Inferred from PSRR test
V
CC
= 1.8V
MAX4292ESA, MAX4294ESD
Ultra-Small, +1.8V, Power,
Rail-to-Rail I/O Op Amps
4
_______________________________________________________________________________________
Note 1: All devices are 100% tested at T
A
= +25C. All temperature limits are guaranteed by design.
V
CC
= 5.0V, 0
V
CM
5.0V
V
CC
= 5.0V, 0
V
CM
5.0V
Specified as
|V
EE
V
OL
|
Specified as
|V
CC
V
OH
|
Inferred from CMRR test
Tested for
0
V
CM
1.8V,
V
CC
= 1.8V
MAX4291EXK, MAX4291EUK
V
CC
= 1.8V
CONDITIONS
nA
10
I
OS
Input Offset Current
nA
80
I
B
V/C
1.2
TCV
OS
Input Offset Voltage Drift
Input Bias Current
mV
15
V
OL
Output Voltage Swing Low
mV
20
V
OH
Output Voltage Swing High
V
0
V
CC
V
CM
Input Common-Mode Voltage
Range
dB
50
CMRR
Common-Mode Rejection Ratio
dB
78
PSRR
Power-Supply Rejection Ratio
dB
80
A
V
Large-Signal Voltage Gain
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
MAX4291EXK, MAX4291EUK
MAX4292ESA, MAX4294ESD
MAX4292EUA, MAX4294EUD
MAX4291EXK, MAX4291EUK
MAX4292ESA, MAX4294ESD
MAX4292EUA, MAX4294EUD
Tested for
0
V
CM
5.0V,
V
CC
= 5.0V
65
65
60
60
60
dB
80
80
R
L
= 100k
,
0.015V
V
OUT
V
CC
- 0.015V
R
L
= 2k
,
0.1V
V
OUT
V
CC
- 0.1V
R
L
= 100k
,
0.015V
V
OUT
V
CC
- 0.015V
R
L
= 2k
,
0.1V
V
OUT
V
CC
- 0.1V
V
CC
= 5.0V
80
80
80
R
L
= 100k
to V
CC
/ 2
R
L
= 100k
to V
CC
/ 2
R
L
= 2k
to V
CC
/ 2
R
L
= 2k
to V
CC
/ 2
40
40
ELECTRICAL CHARACTERISTICS
(V
CC
= +1.8V to +5.5V, V
EE
= V
CM
= 0, V
OUT
= V
CC
/ 2, R
L
= 100k
connected to V
CC
/ 2, T
A
= T
MIN
to T
MAX
, unless otherwise
noted.) (Note 1)
MAX4291/MAX4292/MAX4294
MAX4292ESA, MAX4294ESD
MAX4292EUA, MAX4294EUD
Ultra-Small, +1.8V, Power,
Rail-to-Rail I/O Op Amps
MAX4291/MAX4292/MAX4294
_______________________________________________________________________________________
5
1.0
1.2
1.1
1.5
1.4
1.3
1.6
1.7
1.9
1.8
2.0
-55
-25 -10
-40
5 20 35 50 65 80 95 110
MINIMUM OPERATING VOLTAGE
vs. TEMPERATURE (PSRR
80dB)
MAX4291 toc02
TEMPERATURE (C)
MINIMUM OPERATING VOLTAGE (V)
125
-900
-600
-750
-300
-450
-150
0
-55
-25 -10 5
-40
20
50
35
65 80 95 110 125
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
MAX4291 toc03
TEMPERATURE (C)
INPUT OFFSET VOLTAGE (
V)
V
CC
= 5.5V
V
CC
= 1.8V
V
CC
= 2.4V
0
10
5
20
15
30
25
35
-55
-25 -10 5
-40
20 35 50 65 80 95 110 125
INPUT BIAS CURRENT
vs. TEMPERATURE
MAX4291 toc04
TEMPERATURE (
C)
INPUT BIAS CURRENT (nA)
V
CC
= 5.5V
V
CC
= 1.8V
-40
-30
-20
-10
0
10
20
30
40
-0.5
0.5
0
1.0
1.5
2.0
2.5
INPUT BIAS CURRENT vs. COMMON-MODE
VOLTAGE (V
CC
= 1.8V)
MAX4291 toc05
COMMON-MODE VOLTAGE (V)
INPUT BIAS CURRENT (nA)
-40
-10
-20
-30
0
10
30
20
40
-0.5
0.5
1.5
2.5
3.5
4.5
5.5
INPUT BIAS CURRENT vs. COMMON-MODE
VOLTAGE (V
CC
= 5.5V)
MAX4291 toc06
COMMON-MODE VOLTAGE (V)
INPUT BIAS CURRENT (nA)
0.0
1.0
0.5
2.0
1.5
3.0
2.5
3.5
-55
-25 -10 5
-40
20 35 50 65 80 95 110 125
OUTPUT VOLTAGE SWING vs.
TEMPERATURE (R
L
= 100k
to V
CC
/ 2)
MAX4291 toc07
TEMPERATURE (C)
OUTPUT VOLTAGE SWING (mV)
V
OL
(V
CC
= 5.5V)
V
OH
= V
CC
- V
OUT
V
OL
= V
OUT
- V
EE
V
OH
(V
CC
= 5.5V)
V
OH
(V
CC
= 1.8V)
V
OL
(V
CC
= 1.8V)
0
10
5
20
15
30
25
35
-55
-25 -10 5
-40
20 35 50 65 80 95 110 125
OUTPUT VOLTAGE SWING vs.
TEMPERATURE (R
L
= 2k
to V
CC
/ 2)
MAX4291 toc08
TEMPERATURE (C)
OUTPUT VOLTAGE SWING (mV)
V
OL
(V
CC
= 5.5V)
V
OH
= V
CC
- V
OUT
V
OL
= V
OUT
- V
EE
V
OH
(V
CC
= 5.5V)
V
OH
(V
CC
= 1.8V)
V
OL
(V
CC
= 1.8V)
-105
-90
-95
-100
-85
-80
-70
-75
-65
-55
-25 -10
-40
5 20 35 50 65 80 95 110 125
COMMON-MODE REJECTION
RATIO vs. TEMPERATURE
MAX4291 toc09
TEMPERATURE (C)
CMRR (dB)
V
CC
= 5.5V
V
CC
= 1.8V
0
V
CM
V
CC
Typical Operating Characteristics
(V
CC
= +2.4V, V
EE
= V
CM
= 0, V
OUT
= V
CC
/ 2, no load, T
A
= +25C, unless otherwise noted.)
60
80
70
110
100
90
120
130
150
140
160
-55
-25 -10
-40
5 20 35 50 65 80 95 110
SUPPLY CURRENT PER AMPLIFIER
vs. TEMPERATURE
MAX4291 toc01
TEMPERATURE (
C)
SUPPLY CURRENT (
A)
125
V
CC
= 5.5V
V
CC
= 1.8V
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