19-2023; Rev 0; 1/02
1.0V Micropower, SOT23, Operational Amplifier
General Description
The MAX4289 micropower, operational amplifier is opti-
mized for ultra-low supply voltage operation. The ampli-
fier consumes only 9µA of quiescent supply current and
is fully specified for operation from a single 1.0V to 5.5V
power supply. This ultra-low voltage operation together
with the low quiescent current consumption make the
MAX4289 ideal for use in battery-powered systems
operated from as little as a single alkaline cell. The
MAX4289 also features a wide input common-mode
range that includes the ground, and an output voltage
swing that is virtually Rail-to-Rail
®
, allowing almost all of
the power supply to be used for signal voltage.
The low input offset voltage and low input bias current
specifications along with the high open-loop gain make
the MAX4289 well-suited to applications requiring a
high degree of precision.
The MAX4289 is available in a tiny 6-pin SOT23 pack-
age. All specifications are guaranteed over the extend-
ed temperature range of -40°C to +85°C.
Features
o
Ultra-Low Voltage Operation: Guaranteed
Specifications from 1.0V to 5.5V
o
Input Common-Mode Range: 0 to (V
CC
- 0.2V)
o
Ultra-Low Power Consumption: 9µA Supply
Current (typ)
o
Optimized for Operation from Single-Cell
Battery-Powered Systems
o
Compatible with 3.0V and 5.0V Single-Supply
Systems
o
Low Offset Voltage: 0.2mV
o
Low Input Bias Current: 5nA
o
High Open-Loop Voltage Gain: 90dB
o
Rail-to-Rail Output Stage Drives 5kΩ Load
o
No Output Phase Reversal for Overdriven Inputs
o
Available in a Tiny 6-Pin SOT23 (3mm
✕
3mm)
MAX4289
Applications
Single-Cell Systems
Portable Electronic
Equipment
Battery-Powered
Instrumentation
Hearing Aids Using Zinc
Air Battery
Strain Gauges
Cellular Phones
Notebook Computers
Sensor Amplifiers
Portable Communication
Devices
Ordering Information
PART
MAX4289EUT-T
MAX4289ESA
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
6 SOT23-6
8 SO
TOP
MARK
AARX
—
Typical Operating Characteristic
POWER-SUPPLY REJECTION RATIO
vs. SUPPLY VOLTAGE
90
T
A
= +85°C
80
PSRR (dB)
Pin Configurations
TOP VIEW
OUT
1
6
V
CC
N.C. 1
IN- 2
8
7
N.C.
V
CC
OUT
N.C.
GND 2
70
T
A
= -40°C
MAX4289
5
N.C.
MAX4289
IN+
3
6
5
GND 4
IN+ 3
60
T
A
= +25°C
4
IN-
SOT23-6
50
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
SUPPLY VOLTAGE (V)
SO-8
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
________________________________________________________________
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.
1.0V Micropower, SOT23, Operational Amplifier
MAX4289
ABSOLUTE MAXIMUM RATINGS
Power-Supply Voltage (V
CC
to GND).......................................6V
Input Voltage (IN+ or IN-) ...........................(V
CC
+ 0.3V) to -0.3V
Input Current (IN+ or IN-)....................................................20mA
Output Short-Circuit Duration to V
CC
or GND ............Continuous
Continuous Power Dissipation (T
A
= +70°C)
6-Pin SOT23 (derate 8.7mW/°C above +70°C).............696mW
8-Pin SO (derate 5.88mW/°C above +70°C).................471mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°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
(V
CC
= 3V, V
CM
= 0, V
OUT
= V
CC
/2, R
L
tied to V
CC
/2, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
(Note 1)
PARAMETER
Supply Voltage Range
SYMBOL
V
CC
CONDITIONS
Inferred from the
PSRR tests
V
CC
= 3.0V
V
CC
= 5.5V
Input Offset Voltage
Input Bias Current
Input Offset Current
Differential Input Resistance
Input Common-Mode Voltage
Range
V
OS
I
B
I
OS
R
IN
V
CM
Inferred from
CMRR test
V
CC
= 1.2V
V
CC
= 3.0V
0
0
57
57
57
54
58
80
85
110
75
75
110
90
0.2
7
0.4
7
10
40
10
40
dB
dB
mV
mV
dB
T
A
= +25°C
T
A
= T
MIN
to T
MAX
±5
±0.5
50
V
CC
- 0.2
V
CC
- 0.8
T
A
= +25°C
T
A
= -40°C to +85°C
MIN
1.0
1.2
9
12
18
±0.2
TYP
MAX
5.5
5.5
14
25
40
±2.0
±6.0
±15
±2.0
mV
nA
nA
MΩ
V
µA
UNITS
V
V
CC
= 1.0V, T
A
= +25°C
Quiescent Supply Current
I
CC
V
CC
= 1.2V, 0
≤
V
CC
- 0.2V
Common-Mode Rejection Ratio
CMRR
V
CC
= 1.2V, 0
≤
V
CM
≤
V
CC
- 0.8V
V
CC
= 3.0V, 0
≤
V
CM
≤
V
CC
- 0.8V
Power-Supply Rejection Ratio
Large-Signal Voltage Gain
Output Voltage Swing High
Output Voltage Swing Low
PSRR
A
VOL
V
OH
V
OL
1.0V
≤
V
CC
≤
5.5V, T
A
= +25°C
1.2V
≤
V
CC
≤
5.5V, T
A
= -40°C to +85°C
R
L
= 100kΩ (50mV
≤
V
OUT
≤
V
CC
- 50mV)
R
L
= 5kΩ (100mV
≤
V
OUT
≤
V
CC
- 100mV)
Specified as
|V
CC
- V
OH
|
Specified as V
OL
R
L
= 100kΩ
R
L
= 5kΩ
R
L
= 100kΩ
R
L
= 5kΩ
2
_______________________________________________________________________________________
1.0V Micropower, SOT23, Operational Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 3V, V
CM
= 0, V
OUT
= V
CC
/2, R
L
tied to V
CC
/2, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
(Note 1)
PARAMETER
Output Short-Circuit Current
Power-Up Time
Input Capacitance
Gain-Bandwidth Product
Phase Margin
Gain Margin
Slew Rate
Capacitive-Load Stability
Settling Time to 0.1%
t
S
SYMBOL
I
OUT
t
PU
C
IN
GBW
θM
GM
SR
A
VCL
= +1V/V, no sustained oscillations
A
VCL
= +1V/V, no sustained oscillations
CONDITIONS
Sourcing/sinking
current
V
CC
= 1.0V
V
CC
= 3.0V
MIN
TYP
0.6
19
300
3.0
17
80
10
6
200
75
MAX
UNITS
mA
µs
pF
kHz
degrees
dB
V/ms
pF
µs
MAX4289
Note 1:
All specifications are 100% production tested at T
A
= +25°C. Temperature specification limits are guaranteed by design.
Typical Operating Characteristics
(V
CC
= 3V, V
CM
= 0, R
L
to V
CC
/2, T
A
= +25°C, unless otherwise noted.)
INPUT OFFSET VOLTAGE
vs. INPUT COMMON-MODE VOLTAGE
MAX4289 toc01
MAX4289 toc02
SUPPLY CURRENT vs. TEMPERATURE
16
14
SUPPLY CURRENT (µA)
12
10
8
6
4
2
0
-40
-20
0
60
40
TEMPERATURE (°C)
20
80
100
V
CC
= 1V
V
CC
= 3V
0.8
0.6
INPUT OFFSET VOLTAGE (mV)
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
0
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
0.6
INPUT OFFSET VOLTAGE (mV)
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
MAX4289 toc03
0.8
0.5
1.0
1.5
2.0
2.5
3.0
-40
-20
0
INPUT COMMON-MODE VOLTAGE (V)
20
60
40
TEMPERATURE (°C)
80
100
_______________________________________________________________________________________
3
1.0V Micropower, SOT23, Operational Amplifier
MAX4289
Typical Operating Characteristics (continued)
(V
CC
= 3V, V
CM
= 0, R
L
to V
CC
/2, T
A
= +25°C, unless otherwise noted.)
INPUT BIAS CURENT
vs. TEMPERATURE
MAX4289 toc04
INPUT BIAS CURRENT
vs. INPUT COMMON-MODE VOLTAGE
MAX4289 toc05
OUTPUT SWING HIGH
vs. TEMPERATURE
R
L
CONNECTED TO GND
18
16
14
V
OH
(mV)
12
10
8
6
R
L
= 5kΩ
MAX4289 toc06
10
9
INPUT BIAS CURRENT (nA)
8
7
6
5
4
-40
-20
0
20
40
60
80
30
20
INPUT BIAS CURRENT (nA)
20
10
0
4
2
R
L
= 100kΩ
-40
-20
0
20
40
60
80
100
-10
100
0
0.5
1.0
1.5
2.0
2.5
3.0
TEMPERATURE (°C)
INPUT COMMON-MODE VOLTAGE (V)
0
TEMPERATURE (°C)
OUTPUT SWING LOW
vs. TEMPERATURE
MAX4289 toc07
OPEN-LOOP GAIN
vs. OUTPUT SWING LOW
MAX4289 toc08
OPEN-LOOP GAIN
vs. OUTPUT SWING HIGH
R
L
= 100kΩ
110
MAX4289 toc09
20
18
16
14
V
OL
(mV)
12
10
8
6
4
2
0
-40
R
L
CONNECTED TO V
CC
130
R
L
= 100kΩ
130
110
R
L
= 5kΩ
GAIN (dB)
GAIN (dB)
90
R
L
= 5kΩ
70
90
R
L
= 5kΩ
70
50
R
L
= 100kΩ
30
-20
0
20
40
60
80
100
0
50
100
150
200
250
300
TEMPERATURE (°C)
V
OUT
FROM GND (mV)
50
30
0
50
100
150
200
250
300
V
OUT
FROM V
CC
(mV)
OPEN-LOOP GAIN vs. TEMPERATURE
MAX4289 toc10
OPEN-LOOP GAIN vs. TEMPERATURE
MAX4289 toc11
GAIN AND PHASE vs. FREQUENCY
(C
L
= 0)
80
70
60
50
GAIN (dB)
GAIN
120
R
L
= 100kΩ
110
100
GAIN (dB)
120
110
100
GAIN (dB)
R
L
= 100kΩ
MAX4289 toc12
180
160
140
PHASE (DEGREES)
120
100
80
60
PHASE
40
20
0
-20
0.1
1
FREQUENCY (kHz)
10
100
R
L
= 5kΩ
90
80
70
R
L
CONNECTED TO GND
60
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
R
L
= 5kΩ
90
80
70
R
L
CONNECTED TO V
CC
60
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
40
30
20
10
0
-10
-20
0.01
4
_______________________________________________________________________________________
1.0V Micropower, SOT23, Operational Amplifier
Typical Operating Characteristics (continued)
(V
CC
= 3V, V
CM
= 0, R
L
to V
CC
/2, T
A
= +25°C, unless otherwise noted.)
SMALL-SIGNAL TRANSIENT RESPONSE
MAX4289 toc13
MAX4289
LARGE-SIGNAL TRANSIENT RESPONSE
MAX4289 toc14
MINIMUM-OPERATING VOLTAGE
vs. TEMPERATURE
PSRR > 70dB
MAX4289 toc15
1.2
IN
50mV/div
IN
1V/div
V
CC
(V)
1.1
1.0
OUT
50mV/div
OUT
1V/div
0.9
0.8
10µs/div
200µs/div
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
OUTPUT SINKING CURRENT
vs. OUTPUT VOLTAGE
MAX4289 toc16
OUTPUT SINKING CURRENT
vs. OUTPUT VOLTAGE
V
CC
= 3V
SINKING CURRENT
MAX4289 toc17
1.5
V
CC
= 1V
SINKING CURRENT
1.2
OUTPUT CURRENT (mA)
25
20
OUTPUT CURRENT (mA)
0.9
15
0.6
10
0.3
5
0
0
0.2
0.4
0.6
0.8
1.0
OUTPUT VOLTAGE (V)
0
0
0.5
1.0
1.5
2.0
2.5
3.0
OUTPUT VOLTAGE (V)
OUTPUT SOURCING CURRENT
vs. OUTPUT VOLTAGE
MAX4289 toc18
OUTPUT SOURCING CURRENT
vs. OUTPUT VOLTAGE
V
CC
= 3V
SOURCING CURRENT
20
OUTPUT CURRENT (mA)
MAX4289 toc19
1.0
V
CC
= 1V
SOURCING CURRENT
0.8
OUTPUT CURRENT (mA)
25
0.6
15
0.4
10
0.2
5
0
0
0.2
0.4
0.6
0.8
1.0
OUTPUT VOLTAGE (V)
0
0
0.5
1.0
1.5
2.0
2.5
3.0
OUTPUT VOLTAGE (V)
_______________________________________________________________________________________
5
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