MAX4289EUT-T [MAXIM]
1.0V Micropower, SOT23, Operational Amplifier; 1.0V微功耗， SOT23封装，运算放大器
| 型号： | MAX4289EUT-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 1.0V Micropower, SOT23, Operational Amplifier |
| 文件： | 总9页 (文件大小：281K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2023; Rev 0; 1/02
1.0V Micropower, SOT23, Operational Amplifier
General Description
Features
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.
o Ultra-Low Voltage Operation: Guaranteed
Specifications from 1.0V to 5.5V
o Input Common-Mode Range: 0 to (VCC - 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
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.
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
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.
Applications
✕
o Available in a Tiny 6-Pin SOT23 (3mm 3mm)
Single-Cell Systems
Strain Gauges
Portable Electronic
Equipment
Cellular Phones
Notebook Computers
Sensor Amplifiers
Ordering Information
Battery-Powered
Instrumentation
PIN-
PACKAGE
TOP
MARK
AARX
PART
TEMP RANGE
Portable Communication
Devices
Hearing Aids Using Zinc
Air Battery
MAX4289EUT-T
MAX4289ESA
-40°C to +85°C
-40°C to +85°C
6 SOT23-6
8 SO
—
Typical Operating Characteristic
Pin Configurations
POWER-SUPPLY REJECTION RATIO
TOP VIEW
vs. SUPPLY VOLTAGE
90
T
= +85°C
A
OUT
GND
IN+
1
2
3
6
4
V
CC
N.C.
IN-
1
2
3
4
8
7
6
5
N.C.
80
70
60
50
V
CC
MAX4289
MAX4289
N.C.
IN-
IN+
OUT
N.C.
T
= -40°C
A
GND
T
= +25°C
A
SO-8
SOT23-6
0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5
SUPPLY VOLTAGE (V)
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
ABSOLUTE MAXIMUM RATINGS
Power-Supply Voltage (V
to GND).......................................6V
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
CC
Input Voltage (IN+ or IN-)...........................(V + 0.3V) to -0.3V
CC
Input Current (IN+ or IN-)....................................................20mA
Output Short-Circuit Duration to V
or GND............Continuous
CC
Continuous Power Dissipation (T = +70°C)
A
6-Pin SOT23 (derate 8.7mW/°C above +70°C).............696mW
8-Pin SO (derate 5.88mW/°C above +70°C).................471mW
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
= 3V, V
= 0, V
= V /2, R tied to V /2, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.)
MAX A
CC
CM
OUT
CC
L
CC
A
MIN
(Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
1.0
TYP
MAX
5.5
5.5
14
UNITS
T
T
= +25°C
A
A
Inferred from the
PSRR tests
Supply Voltage Range
Quiescent Supply Current
Input Offset Voltage
V
V
CC
= -40°C to +85°C
1.2
V
V
V
= 1.0V, T = +25°C
9
CC
CC
CC
A
I
µA
= 3.0V
= 5.5V
12
18
0.2
25
CC
40
T
T
= +25°C
2.0
6.0
15
A
A
V
mV
OS
= T
to T
MAX
MIN
Input Bias Current
I
5
0.5
50
nA
nA
B
Input Offset Current
I
2.0
OS
Differential Input Resistance
R
MΩ
IN
V
V
= 1.2V
= 3.0V
0
0
V
V
- 0.2
CC
CC
CC
CC
Input Common-Mode Voltage
Range
Inferred from
CMRR test
V
V
CM
- 0.8
V
V
V
= 1.2V, 0 ≤ V
= 1.2V, 0 ≤ V
= 3.0V, 0 ≤ V
- 0.2V
57
85
110
75
75
110
90
0.2
7
CC
CC
CC
CC
CM
CM
Common-Mode Rejection Ratio
CMRR
PSRR
≤ V
≤ V
- 0.8V
- 0.8V
57
57
54
58
dB
CC
CC
1.0V ≤ V
1.2V ≤ V
≤ 5.5V, T = +25°C
A
CC
CC
Power-Supply Rejection Ratio
Large-Signal Voltage Gain
Output Voltage Swing High
Output Voltage Swing Low
dB
dB
mV
mV
≤ 5.5V, T = -40°C to +85°C
A
R = 100kΩ (50mV ≤ V
≤ V - 50mV)
CC
L
OUT
A
VOL
R = 5kΩ (100mV ≤ V
≤ V - 100mV)
80
L
OUT
CC
R = 100kΩ
10
40
10
40
L
Specified as
|V - V
V
OH
|
CC
OH
R = 5kΩ
L
R = 100kΩ
0.4
7
L
V
Specified as V
OL
OL
R = 5kΩ
L
2
_______________________________________________________________________________________
1.0V Micropower, SOT23, Operational Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(V
= 3V, V
= 0, V
= V /2, R tied to V /2, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.)
MAX A
CC
CM
OUT
CC
L
CC
A
MIN
(Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
0.6
19
MAX
UNITS
V
V
= 1.0V
= 3.0V
CC
CC
Sourcing/sinking
current
Output Short-Circuit Current
I
mA
OUT
Power-Up Time
t
300
3.0
17
µs
pF
PU
Input Capacitance
Gain-Bandwidth Product
Phase Margin
C
IN
GBW
θM
kHz
degrees
dB
80
Gain Margin
GM
SR
10
Slew Rate
6
V/ms
pF
Capacitive-Load Stability
Settling Time to 0.1%
A
A
= +1V/V, no sustained oscillations
= +1V/V, no sustained oscillations
200
75
VCL
VCL
t
µs
S
Note 1: All specifications are 100% production tested at T = +25°C. Temperature specification limits are guaranteed by design.
A
Typical Operating Characteristics
(V
= 3V, V
= 0, R to V /2, T = +25°C, unless otherwise noted.)
CM L CC A
CC
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
INPUT OFFSET VOLTAGE
vs. INPUT COMMON-MODE VOLTAGE
SUPPLY CURRENT vs. TEMPERATURE
16
0.8
0.6
0.4
0.2
0
0.8
0.6
14
12
10
8
V
= 3V
CC
0.4
0.2
V
= 1V
CC
0
6
4
-0.2
-0.4
-0.6
-0.8
-0.2
-0.4
2
0
-0.6
-0.8
-40 -20
0
20
60
80 100
40
-40 -20
0
20
60
80 100
0
0.5
1.0
1.5
2.0
2.5
3.0
40
TEMPERATURE (°C)
TEMPERATURE (°C)
INPUT COMMON-MODE VOLTAGE (V)
_______________________________________________________________________________________
3
1.0V Micropower, SOT23, Operational Amplifier
Typical Operating Characteristics (continued)
(V
= 3V, V
= 0, R to V /2, T = +25°C, unless otherwise noted.)
CC
CM
L
CC
A
OUTPUT SWING HIGH
vs. TEMPERATURE
INPUT BIAS CURENT
vs. TEMPERATURE
INPUT BIAS CURRENT
vs. INPUT COMMON-MODE VOLTAGE
20
18
16
14
12
10
8
10
30
20
10
0
R CONNECTED TO GND
L
9
8
7
6
5
4
R = 5kΩ
L
6
4
R = 100kΩ
L
2
0
-10
-40 -20
0
20
40
60
80 100
-40 -20
0
20
40
60
80 100
0
0.5
1.0
1.5
2.0
2.5
3.0
TEMPERATURE (°C)
TEMPERATURE (°C)
INPUT COMMON-MODE VOLTAGE (V)
OUTPUT SWING LOW
vs. TEMPERATURE
OPEN-LOOP GAIN
vs. OUTPUT SWING LOW
OPEN-LOOP GAIN
vs. OUTPUT SWING HIGH
20
130
110
90
130
110
90
R CONNECTED TO V
L
CC
R = 100kΩ
L
18
16
14
12
10
8
R = 100kΩ
L
R = 5kΩ
L
R = 5kΩ
L
R = 5kΩ
L
70
70
6
4
50
50
2
R = 100kΩ
L
0
30
30
-40 -20
0
20
40
60
80 100
0
50
100
150
200
250
300
0
50
100
150
200
250
300
TEMPERATURE (°C)
V
FROM GND (mV)
V
FROM V (mV)
OUT CC
OUT
GAIN AND PHASE vs. FREQUENCY
OPEN-LOOP GAIN vs. TEMPERATURE
OPEN-LOOP GAIN vs. TEMPERATURE
(C = 0)
L
MAX4289 toc12
80
120
110
100
90
120
110
100
90
180
R = 100kΩ
L
70
60
50
40
30
20
10
0
160
140
120
100
80
R = 100kΩ
L
GAIN
R = 5kΩ
L
R = 5kΩ
L
60
80
80
40
PHASE
20
70
70
R CONNECTED TO GND
L
R CONNECTED TO V
L
-10
-20
0.01
0
CC
-20
60
60
-40 -20
0
20
40
60
80 100
-40 -20
0
20
40
60
80 100
0.1
1
10
100
TEMPERATURE (°C)
TEMPERATURE (°C)
FREQUENCY (kHz)
4
_______________________________________________________________________________________
1.0V Micropower, SOT23, Operational Amplifier
Typical Operating Characteristics (continued)
(V
= 3V, V
= 0, R to V /2, T = +25°C, unless otherwise noted.)
CM L CC A
CC
MINIMUM-OPERATING VOLTAGE
vs. TEMPERATURE
SMALL-SIGNAL TRANSIENT RESPONSE
LARGE-SIGNAL TRANSIENT RESPONSE
MAX4289 toc13
MAX4289 toc14
1.2
1.1
1.0
0.9
0.8
PSRR > 70dB
IN
IN
50mV/div
1V/div
OUT
50mV/div
OUT
1V/div
-40 -20
0
20
40
60
80 100
10µs/div
200µs/div
TEMPERATURE (°C)
OUTPUT SINKING CURRENT
vs. OUTPUT VOLTAGE
OUTPUT SINKING CURRENT
vs. OUTPUT VOLTAGE
25
20
15
10
5
1.5
V
= 3V
CC
V
= 1V
CC
SINKING CURRENT
SINKING CURRENT
1.2
0.9
0.6
0.3
0
0
0
0.5
1.0
1.5
2.0
2.5
3.0
0
0.2
0.4
0.6
0.8
1.0
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
OUTPUT SOURCING CURRENT
vs. OUTPUT VOLTAGE
OUTPUT SOURCING CURRENT
vs. OUTPUT VOLTAGE
1.0
0.8
0.6
0.4
0.2
0
25
20
15
10
5
V
= 1V
CC
V
= 3V
CC
SOURCING CURRENT
SOURCING CURRENT
0
0
0.2
0.4
0.6
0.8
1.0
0
0.5
1.0
1.5
2.0
2.5
3.0
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
_______________________________________________________________________________________
5
1.0V Micropower, SOT23, Operational Amplifier
Pin Description
PIN
NAME
FUNCTION
SO
SOT23
1, 5, 8
5
4
3
2
1
6
N.C.
IN-
No Connection. Not internally connected.
2
3
4
6
7
Inverting Input
IN+
Noninverting Input
GND
OUT
Ground
Amplifier Output
V
Positive Supply. Bypass with a 0.1µF capacitor to GND.
CC
Detailed Description
The MAX4289 consumes ultra-low power (9µA supply
current typically) and has a rail-to-rail output stage that
is specifically designed for low-voltage operation. The
IN
input common-mode voltage range extends from V
-
CC
500mV/div
0.2V to ground, although full rail-to-rail input range is
possible with degraded performance. The input offset
voltage is typically 200µV. Low-operating supply volt-
age, low supply current, and rail-to-rail outputs make
this operational amplifier an excellent choice for preci-
sion or general-purpose, low-voltage, battery-powered
systems.
OUT
500mV/div
V
IN
= 2.0V
IN
= 1kHz
L
f
R = 100kΩ
Rail-to-Rail Output Stage
The MAX4289 output stage can drive a 5kΩ load and
still swing to within 7mV of the rails. Figure 1 shows the
output voltage swing of the MAX4289 configured as a
unity-gain buffer, powered from a single 2V supply volt-
age. The output for this setup typically swings from
200µs/div
Figure 1. Rail-to-Rail Input/Output Voltage Range
+0.4mV to (V
- 0.2mV) with a 100kΩ load.
CC
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
Applications Information
Power-Supply Considerations
25
20
The MAX4289 operates from a single 1.0V to 5.5V supply
and consumes only 9µA of supply current. A high power-
supply rejection ratio of 75dB allows the amplifier to be
powered directly off a decaying battery voltage, simplify-
ing design and extending battery life. The MAX4289 is
ideally suited for single-cell battery-powered systems.
Figures 2 and 3 show the supply current and PSRR as a
function of supply voltage and temperature.
T
A
= +85°C
15
10
5
T
= +25°C
A
T
= -40°C
A
0
0
1
2
3
4
5
6
SUPPLY VOLTAGE (V)
Figure 2. I
vs. V
Over the Temperature Range
CC
CC
6
_______________________________________________________________________________________
1.0V Micropower, SOT23, Operational Amplifier
POWER-SUPPLY REJECTION RATIO
vs. SUPPLY VOLTAGE
90
T = +85°C
A
80
70
60
50
R
ISO
MAX4289
T = -40°C
A
R
C
L
L
T = +25°C
A
0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5
SUPPLY VOLTAGE (V)
R
L
A =
≈ 1
V
R + R
L
ISO
Figure 4. Using a Resistor to Isolate a Capacitive Load from
the Op Amp
Figure 3. PSRR vs. V
Over the Temperature Range
CC
Power Supplies and Layout
The MAX4289 operates from a single 1V to 5.5V power
supply. Bypass the power with a 0.1µF capacitor to
ground.
Power-Up Settling Time
The MAX4289 typically requires 300µs to power-up
after V
is stable. During this startup time, the output
is indeterminate. The application circuit should allow for
this initial delay.
CC
Good layout techniques optimize performance by
decreasing the amount of stray capacitance at the op
amp’s inputs and outputs. To decrease stray capaci-
tance, minimize trace lengths by placing external com-
ponents close to the op amp’s pins.
Driving Capacitive Loads
The MAX4289 is unity-gain stable for loads up to
200pF. Applications that require greater capacitive-
drive capability should use an isolation resistor
between the output and the capacitive load (Figure 4).
Note that this solution results in a loss of gain accuracy
because R
resistor.
forms a voltage-divider with the load
ISO
Using the MAX4289 as a Comparator
Although optimized for use as an operational amplifier,
the MAX4289 can also be used as a rail-to-rail I/O com-
parator (Figure 5). External hysteresis can be used to
minimize the risk of output oscillation. The positive feed-
back circuit, shown in Figure 5, causes the input thresh-
old to change when the output voltage changes state.
_______________________________________________________________________________________
7
1.0V Micropower, SOT23, Operational Amplifier
HYSTERESIS
V
V
HI
INPUT
V
OH
LO
V
OH
OUTPUT
V
OL
V
IN
R
HYST
R1
R2
V
CC
V
OUT
MAX4289
V
EE
V
EE
Figure 5. Hysteresis Comparator Circuit
Chip Information
TRANSISTOR COUNT: 557
8
_______________________________________________________________________________________
1.0V Micropower, SOT23, Operational Amplifier
Package Information
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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