19-2016; Rev 1; 4/05
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
General Description
The MAX4245/MAX4246/MAX4247 family of low-cost
op amps offer rail-to-rail inputs and outputs, draw only
320µA of quiescent current, and operate from a single
+2.5V to +5.5V supply. For additional power conserva-
tion, the MAX4245/MAX4247 offer a low-power shutdown
mode that reduces supply current to 50nA, and puts the
amplifiers’ outputs in a high-impedance state. These
devices are unity-gain stable with a 1MHz gain-band-
width product driving capacitive loads up to 470pF.
The MAX4245/MAX4246/MAX4247 family is specified
from -40°C to +125°C, making them suitable for use in a
variety of harsh environments, such as automotive appli-
cations. The MAX4245 single amplifier is available in
ultra-small 6-pin SC70 and space-saving 6-pin SOT23
packages. The MAX4246 dual amplifier is available in
8-pin SOT23, SO, and µMAX
®
packages. The MAX4247
dual amplifier comes in a tiny 10-pin µMAX package.
Features
o
Rail-to-Rail Input and Output Voltage Swing
o
50nA (max) Shutdown Mode (MAX4245/MAX4247)
o
320µA (typ) Quiescent Current Per Amplifier
o
Single +2.5V to +5.5V Supply Voltage Range
o
110dB Open-Loop Gain with 2kΩ Load
o
0.01% THD with 100kΩ Load
o
Unity-Gain Stable up to C
LOAD
= 470pF
o
No Phase Inversion for Overdriven Inputs
o
Available in Space-Saving Packages
6-Pin SC70 or 6-Pin SOT23 (MAX4245)
8-Pin SOT23/SO or 8-Pin µMAX (MAX4246)
10-Pin µMAX (MAX4247)
MAX4245/MAX4246/MAX4247
Applications
Portable Communications
Single-Supply Zero-Crossing Detectors
Instruments and Terminals
Electronic Ignition Modules
Infrared Receivers
Sensor-Signal Detection
PART
Ordering Information
TEMP RANGE
PIN-
PACKAGE
6 SC70-6
6 SOT23-6
8 SOT23-8
8 SO
8 µMAX
10 µMAX
TOP
MARK
AAZ
AAUB
AAIN
—
—
—
MAX4245AXT-T
-40°C to +125°C
MAX4245AUT-T -40°C to +125°C
MAX4246AKA-T
-40°C to +125°C
MAX4246ASA
MAX4246AUA
MAX4247AUB
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
Selector Guide
PART
MAX4245AXT-T
MAX4245AUT-T
MAX4246AKA-T
MAX4246ASA
MAX4246AUA
MAX4247AUB
AMPLIFIERS
PER PACKAGE
1
1
2
2
2
2
SHUTDOWN
MODE
TOP VIEW
Pin Configurations
Yes
Yes
No
No
No
Yes
IN- 3
4
OUT
INA+
3
6 INB-
IN+ 1
MAX4245
6
V
DD
OUTA
1
8 V
DD
MAX4246
INA-
2
7 OUTB
V
SS
2
5
SHDN
SC70-6/SOT23-6
V
SS
4
5 INB+
SOT23-8/µMAX/SO
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Pin Configurations continued at end of data sheet.
1
________________________________________________________________
Maxim Integrated Products
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.
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
MAX4245/MAX4246/MAX4247
ABSOLUTE MAXIMUM RATINGS
Power-Supply Voltage (V
DD
to V
SS
) .........................-0.3V to +6V
All Other Pins ...................................(V
SS
- 0.3V) to (V
DD
+ 0.3V)
Output Short-Circuit Duration
(OUT shorted to V
SS
or V
DD
)................................. Continuous
Continuous Power Dissipation (T
A
= +70°C)
6-Pin SC70 (derate 3.1mW/°C above +70°C) ..............245mW
6-Pin SOT23 (derate 8.7mW/°C above +70°C)............695mW
8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW
8-Pin SOT23 (derate 9.1mW/°C above +70°C)............727mW
8-Pin µMAX (derate 4.5mW/°C above +70°C) .............362mW
10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW
Operating Temperature Range .........................-40°C to +125°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
(V
DD
= +2.7V, V
SS
= 0V, V
CM
= 0V, V
OUT
= V
DD
/ 2, R
L
connected from OUT to V
DD
/ 2,
SHDN_
= V
DD
(MAX4245/MAX4247 only),
T
A
= +25°C,
unless otherwise noted.) (Note 1)
PARAMETER
Supply Voltage Range
Supply Current (Per Amplifier)
Supply Current in Shutdown
Input Offset Voltage
Input Bias Current
Input Offset Current
Input Resistance
Input Common-Mode Voltage
Range
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Large-Signal Voltage Gain
SYMBOL
V
DD
I
DD
I
SHDN_
V
OS
I
B
I
OS
R
IN
V
CM
CMRR
PSRR
A
V
V
DD
= +2.7V
V
DD
= +5.5V
SHDN_
= V
SS
(Note 2)
V
SS
- 0.1V
≤
V
CM
≤
V
DD
+ 0.1V
V
SS
- 0.1V
≤
V
CM
≤
V
DD
+ 0.1V
V
SS
- 0.1V
≤
V
CM
≤
V
DD
+ 0.1V
|V
IN+
- V
IN-
|
≤
10mV
Inferred from CMRR test
V
SS
- 0.1V
≤
V
CM
≤
V
DD
+ 0.1V
2.5V
≤
V
DD
≤
5.5V
V
SS
+ 0.05V
≤
V
OUT
≤
V
DD
- 0.05V,
R
L
= 100kΩ
V
SS
+ 0.2V
≤
V
OUT
≤
V
DD
- 0.2V, R
L
= 2kΩ
Output Voltage Swing High
Output Voltage Swing Low
Output Short-Circuit Current
Output Leakage Current in
Shutdown
SHDN_
Logic Low
SHDN_
Logic High
SHDN_
Input Current
V
OH
V
OL
I
OUT(SC)
I
OUT(SH)
V
IL
V
IH
I
L
/I
H
Specified as
V
DD
- V
OUT
Specified as
V
OUT
- V
SS
V
DD
= +5.0V
R
L
= 100kΩ
R
L
= 2kΩ
R
L
= 100kΩ
R
L
= 2kΩ
Sourcing
Sinking
95
V
SS
- 0.1
65
75
80
90
120
110
1
35
1
30
11
30
±0.01
±0.5
0.3 x V
DD
0.7 x V
DD
0.5
50
60
60
mV
mV
mA
µA
V
V
nA
CONDITIONS
Inferred from PSRR test
MIN
2.5
320
375
0.05
±0.4
±10
±1
4000
V
DD
+ 0.1
TYP
MAX
5.5
650
700
0.5
±1.5
±50
±6
UNITS
V
µA
µA
mV
nA
nA
kΩ
V
dB
dB
dB
Device in Shutdown Mode
(SHDN_ = V
SS
), V
SS
≤
V
OUT
≤
V
DD
(Note 2)
(Note 2)
(Note 2)
V
SS
≤
SHDN_
≤
V
DD
(Note 2)
2
_______________________________________________________________________________________
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V, V
SS
= 0V, V
CM
= 0V, V
OUT
= V
DD
/ 2, R
L
connected from OUT to V
DD
/ 2,
SHDN_
= V
DD
(MAX4245/MAX4247 only),
T
A
= +25°C,
unless otherwise noted.) (Note 1)
PARAMETER
Gain-Bandwidth Product
Phase Margin
Gain Margin
Slew Rate
Input Voltage-Noise Density
Input Current-Noise Density
Capacitive-Load Stability
Shutdown Delay Time
Enable Delay Time
Power-On Time
Input Capacitance
Total Harmonic Distortion
Settling Time to 0.01%
SYMBOL
GBW
φ
M
G
M
SR
e
n
i
n
C
LOAD
t
(SH)
t
(EN)
t
ON
C
IN
THD
t
S
f = 10kHz, V
OUT
= 2Vp-p, A
V
= +1,
V
DD
= +5.0V, Load = 100kΩ to V
DD
/2
V
OUT
= 4V step, V
DD
= +5.0V, A
V
= +1
f = 10kHz
f = 10kHz
A
V
= 1 (Note 3)
(Note 2)
(Note 2)
3
4
4
2.5
0.01
10
CONDITIONS
MIN
TYP
1.0
70
20
0.4
52
0.1
470
MAX
UNITS
MHz
degrees
dB
V/µs
nV/√Hz
pA/√Hz
pF
µs
µs
µs
pF
%
µs
MAX4245/MAX4246/MAX4247
ELECTRICAL CHARACTERISTICS
(V
DD
= +2.7V, V
SS
= 0V, V
CM
= 0V, V
OUT
= V
DD
/ 2, R
L
connected from OUT to V
DD
/ 2,
SHDN_
= V
DD
(MAX4245/MAX4247 only),
T
A
= -40°C to +125°C,
unless otherwise noted.) (Note 1)
PARAMETER
Supply Voltage Range
Supply Current (Per Amplifier)
Supply Current in Shutdown
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Offset Current
Input Common-Mode Voltage
Range
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Large-Signal Voltage Gain
Output Voltage Swing High
Output Voltage Swing Low
Output Leakage Current in
Shutdown
SYMBOL
V
DD
I
DD
I
SHDN_
V
OS
TCV
OS
I
B
I
OS
V
CM
CMRR
PSRR
A
V
V
OH
V
OL
I
OUT(SH)
V
DD
= +2.7V
SHDN_
= V
SS
(Note 2)
V
SS
≤
V
CM
≤
V
DD
(Note 4)
V
SS
≤
V
CM
≤
V
DD
(Note 4)
V
SS
≤
V
CM
≤
V
DD
(Note 4)
V
SS
≤
V
CM
≤
V
DD
(Note 4)
Inferred from CMRR test (Note 4)
V
SS
≤
V
CM
≤
V
DD
(Note 4)
2.5V
≤
V
DD
≤
5.5V
V
SS
+ 0.2V
≤
V
OUT
≤
V
DD
- 0.2V,
R
L
= 2kΩ
Specified as V
DD
- V
OUT
, R
L
= 2kΩ
Specified as V
OUT
- V
SS
, R
L
= 2kΩ
Device in Shutdown Mode (SHDN_ = V
SS
),
V
SS
≤
V
OUT
≤
V
DD
(Note 3)
V
SS
60
70
85
90
90
±1.0
±2
±100
±10
V
DD
CONDITIONS
Inferred from PSRR test
MIN
2.5
TYP
MAX
5.5
800
1
±3.0
UNITS
V
µA
µA
mV
µV/°C
nA
nA
V
dB
dB
dB
mV
mV
µA
_______________________________________________________________________________________
3
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
MAX4245/MAX4246/MAX4247
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V, V
SS
= 0V, V
CM
= 0V, V
OUT
= V
DD
/ 2, R
L
connected from OUT to V
DD
/ 2,
SHDN_
= V
DD
(MAX4245/MAX4247 only),
T
A
= -40°C to +125°C,
unless otherwise noted.) (Note 1)
PARAMETER
SHDN_
Logic Low
SHDN_
Logic High
SHDN_
Input Current
SYMBOL
V
IL
V
IH
I
L
/I
H
(Note 2)
(Note 2)
V
SS
≤
SHDN_
≤
V
DD
(Notes 2, 3)
0.7
✕
V
DD
100
CONDITIONS
MIN
TYP
MAX
0.3
✕
V
DD
UNITS
V
V
nA
Note 1:
Note 2:
Note 3:
Note 4:
Specifications are 100% tested at T
A
= +25°C. All temperature limits are guaranteed by design.
Shutdown mode is only available in MAX4245 and MAX4247.
Guaranteed by design, not production tested.
For -40°C to +85°C, Input Common-Mode Range is V
SS
- 0.1V
≤
V
CM
≤
V
DD
+ 0.1V.
Typical Operating Characteristics
(V
DD
= 2.7V, V
SS
= V
CM
= 0V, V
OUT
= V
DD
/ 2, no load, T
A
= +25°C, unless otherwise noted.)
MAX4245/MAX4247
SHUTDOWN SUPPLY CURRENT
PER AMPLIFIER vs. TEMPERATURE
MAX4245 toc01
MAX4245 toc02
SUPPLY CURRENT PER AMPLIFIER
vs. SUPPLY VOLTAGE
500
450
400
I
DD
(µA)
350
300
250
200
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
V
DD
(V)
T
A
= +125°C
200
INPUT OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
V
DD
= 2.5V
500
T
A
= +85°C
400
V
OS
(µV)
T
A
= +125°C
MAX4245 toc03
600
160
I
SHDN
(nA)
T
A
= +85°C
T
A
= +25°C
120
300
200
T
A
= +25°C
80
T
A
= -40°C
T
A
= -40°C
40
100
0
-40
15
70
125
0
0.5
1.0
1.5
2.0
2.5
TEMPERATURE (°C)
V
CM
(V)
0
INPUT OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
MAX4245 toc04
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
MAX4245 toc05
INPUT BIAS CURRENT
vs. COMMON-MODE VOLTAGE
V
DD
= 5.5V
15
10
T
A
= +125°C
T
A
= -40°C
MAX4245 toc06
600
V
DD
= 5.5V
500
T
A
= +125°C
350
300
250
V
DD
= 2.5V
200
150
100
50
0
V
DD
= 5.5V
20
T
A
= +85°C
400
V
OS
(µV)
V
OS
(µV)
300
200
T
A
= -40°C
100
0
0
1
2
3
V
CM
(V)
4
5
6
T
A
= +25°C
I
BIAS
(nA)
5
T
A
= +85°C
0
-5
-10
T
A
= +25°C
-15
-40
15
70
125
0
1
2
3
V
CM
(V)
4
5
6
TEMPERATURE (°C)
4
_______________________________________________________________________________________
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
Typical Operating Characteristics (continued)
(V
DD
= 2.7V, V
SS
= V
CM
= 0V, V
OUT
= V
DD
/ 2, no load, T
A
= +25°C, unless otherwise noted.)
OUTPUT SOURCE CURRENT
vs. OUTPUT VOLTAGE
MAX4245 toc07
MAX4245/MAX4246/MAX4247
OUTPUT SINK CURRENT
vs. OUTPUT VOLTAGE
MAX4245 toc08
OUTPUT SWING HIGH
vs. TEMPERATURE
40
MAX4245 toc09
14
12
10
I
SOURCE
(mA)
8
6
4
2
0
V
DD
= 2.5V
V
DD
= 5.5V
50
45
40
35
I
SINK
(mA)
30
25
20
15
10
5
0
V
DD
= 2.5V
V
DD
= 5.5V
V
DD
- V
OUT
(mV)
30
R
L
= 2kΩ
20
10
R
L
= 100kΩ
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
V
OUT
(V)
-40
15
70
125
TEMPERATURE (°C)
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
V
OUT
(V)
OUTPUT SWING LOW
vs. TEMPERATURE
MAX4245 toc10
CROSSTALK vs. FREQUENCY
MAX4245 toc11
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
-10
-20
-30
PSRR (dB)
-40
-50
-60
-70
MAX4245 toc12
-50
0
40
-70
V
OUT
- V
SS
(mV)
30
R
L
= 2kΩ
20
CROSSTALK (dB)
-90
10
R
L
= 100kΩ
0
-40
15
70
125
TEMPERATURE (°C)
-110
-80
-90
-130
0.001 0.01
-100
0.1
1
10
100 1000 10,000
0.1
10
10
100
1000
10,000
FREQUENCY (kHz)
FREQUENCY (kHz)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. INPUT FREQUENCY
1
MAX4245 toc13
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. AMPLITUDE
R
L
= 100kΩ
A
V
= +1
f
IN
= 1kHz
V
DD
= 5.0V
MAX4245 toc14
GAIN AND PHASE vs. FREQUENCY
80
NO LOAD
60
40
GAIN (dB)
30
PHASE (deg)
-30
PHASE
GAIN
-90
-150
-210
-270
1
10
100
1000
10,000
FREQUENCY (kHz)
MAX4245 toc15
0.1
THD + N (%)
R
L
= 100kΩ
A
V
= +1
V
OUT
= 2V
P-P
V
DD
= 5.0V
THD + N (%)
10
90
1
0.1
0.01
20
0
0.01
0.001
0.001
0.0001
1000
10,000
100,000
0
1
2
3
4
5
INPUT FREQUENCY (Hz)
OUTPUT VOLTAGE (V
P-P
)
-20
-40
0.1
0.0001
100
_______________________________________________________________________________________
5
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