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MAX4245/MAX4246/
MAX4247
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 conservation, the
MAX4245/MAX4247 offer a low-power shutdown mode
that reduces supply current to 50nA, and puts the ampli-
fiers outputs in a high-impedance state. These devices
are unity-gain stable with a 1MHz gain-bandwidth prod
uct 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. 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.
Applications
● Portable Communications
● Single-Supply Zero-Crossing Detectors
● Instruments and Terminals
● Electronic Ignition Modules
● Infrared Receivers
● Sensor-Signal Detection
Selector Guide
PART
MAX4245AXT
MAX4245AUT
MAX4246AKA
MAX4246ASA
MAX4246AUA
MAX4247AUB
AMPLIFIERS
PER PACKAGE
1
1
2
2
2
2
SHUTDOWN
MODE
Yes
Yes
No
No
No
Yes
μMAX is a registered trademark of Maxim Integrated Products, Inc.
Features
● Rail-to-Rail Input and Output Voltage Swing
● 50nA (max) Shutdown Mode (MAX4245/MAX4247)
● 320µA (typ) Quiescent Current Per Amplifier
● Single +2.5V to +5.5V Supply Voltage Range
110dB Open-Loop Gain with 2kΩ Load
0.01% THD with 100kΩ Load
● Unity-Gain Stable up to CLOAD = 470pF
● No Phase Inversion for Overdriven Inputs
● 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)
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
MAX4245AXT+T -40°C to +125°C 6 SC70
MAX4245AUT+T -40°C to +125°C 6 SOT23
MAX4246AKA+T -40°C to +125°C 8 SOT23
MAX4246ASA+T -40°C to +125°C 8 SO
MAX4246AUA+T -40°C to +125°C 8 µMAX
MAX4247AUB+T -40°C to +125°C 10 µMAX
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
TOP
MARK
AAZ
AAUB
AAIN
Pin Configurations
TOP VIEW
+
IN+ 1
MAX4245
6 VDD
+
OUTA 1
VSS 2
5 SHDN INA- 2
IN- 3
4 OUT INA+ 3
SC70-6/SOT23-6
VSS 4
8 VDD
MAX4246
7 OUTB
6 INB-
5 INB+
SOT23-8/µMAX-8
Pin Configurations continued at end of datat sheet.
19-2016; Rev 3; 5/14

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MAX4245/MAX4246/
MAX4247
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
Absolute Maximum Ratings
Power-Supply Voltage (VDD to VSS)........................-0.3V to +6V
All Other Pins................................. (VSS - 0.3V) to (VDD + 0.3V)
Output Short-Circuit Duration
(OUT shorted to VSS or VDD)............................... Continuous
Continuous Power Dissipation (TA = +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
Soldering Temperature (reflow)........................................+260°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
(VDD = +2.7V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL connected from OUT to VDD / 2, SHDN_ = VDD (MAX4245/MAX4247 only),
TA = +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
Output Voltage Swing High
Output Voltage Swing Low
Output Short-Circuit Current
SYMBOL
VDD
IDD
ISHDN_
VOS
IB
IOS
RIN
CONDITIONS
Inferred from PSRR test
VDD = +2.7V
VDD = +5.5V
SHDN_ = VSS (Note 2)
VSS - 0.1V ≤ VCM ≤ VDD + 0.1V
VSS - 0.1V ≤ VCM ≤ VDD + 0.1V
VSS - 0.1V ≤ VCM ≤ VDD + 0.1V
|VIN+ - VIN-| ≤ 10mV
VCM
Inferred from CMRR test
CMRR
PSRR
AV
VOH
VOL
IOUT(SC)
VSS - 0.1V ≤ VCM ≤ VDD + 0.1V
2.5V ≤ VDD ≤ 5.5V
VSS + 0.05V ≤ VOUT ≤ VDD - 0.05V,
RL = 100kΩ
VSS + 0.2V ≤ VOUT ≤ VDD - 0.2V,
RL = 2kΩ
Specified as
VDD - VOUT
RL = 100kΩ
RL = 2kΩ
Specified as
VOUT - VSS
RL = 100kΩ
RL = 2kΩ
VDD = +5.0V
Sourcing
Sinking
MIN TYP MAX UNITS
2.5 5.5 V
320 650
375 700
µA
0.05 0.5
µA
±0.4 ±1.5
mV
±10 ±50
nA
±1 ±6 nA
4000
kΩ
VSS - 0.1
VDD + 0.1
65 80
75 90
V
dB
dB
120
95 110
dB
1
mV
35 60
1
mV
30 60
11
mA
30
Output Leakage Current in
Shutdown
IOUT(SH)
Device in Shutdown Mode
(SHDN_ = VSS), VSS ≤ VOUT ≤ VDD
(Note 2)
±0.01 ±0.5
µA
SHDN_ Logic Low
SHDN_ Logic High
SHDN_ Input Current
VIL
VIH
IL/IH
(Note 2)
(Note 2)
VSS SHDN_ ≤ VDD (Note 2)
0.3 x VDD
0.7 x VDD
0.5 50
V
V
nA
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Maxim Integrated 2

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MAX4245/MAX4246/
MAX4247
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
Electrical Characteristics (continued)
(VDD = +2.7V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL connected from OUT to VDD / 2, SHDN_ = VDD (MAX4245/MAX4247 only),
TA = +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
ΦM
GM
SR
en
in
CLOAD
t(SH)
t(EN)
tON
CIN
THD
tS
CONDITIONS
f = 10kHz
f = 10kHz
AV = 1 (Note 3)
(Note 2)
(Note 2)
f = 10kHz, VOUT = 2VP-P, AV = +1,
VDD = +5.0V, Load = 100kΩ to VDD/2
VOUT = 4V step, VDD = +5.0V, AV = +1
MIN TYP MAX UNITS
1.0 MHz
70 degrees
20 dB
0.4 V/µs
52 nV/√Hz
0.1 pA/√Hz
470 pF
3 µs
4 µs
4 µs
2.5 pF
0.01
%
10 µs
Electrical Characteristics
(VDD = +2.7V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL connected from OUT to VDD / 2, SHDN_ = VDD (MAX4245/MAX4247 only),
TA = -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
VDD
IDD
ISHDN_
VOS
TCVOS
IB
IOS
VCM
CMRR
PSRR
AV
VOH
VOL
IOUT
(SH)
CONDITIONS
Inferred from PSRR test
VDD = +2.7V
SHDN_ = VSS (Note 2)
VSS ≤ VCM ≤ VDD (Note 4)
VSS ≤ VCM ≤ VDD (Note 4)
VSS ≤ VCM ≤ VDD (Note 4)
VSS ≤ VCM ≤ VDD (Note 4)
Inferred from CMRR test (Note 4)
VSS ≤ VCM ≤ VDD (Note 4)
2.5V ≤ VDD ≤ 5.5V
VSS + 0.2V ≤ VOUT ≤ VDD - 0.2V,
RL = 2kΩ
Specified as VDD - VOUT, RL = 2kΩ
Specified as VOUT - VSS, RL = 2kΩ
Device in Shutdown Mode (SHDN_ = VSS),
VSS ≤ VOUT ≤ VDD (Note 3)
MIN TYP MAX UNITS
2.5 5.5 V
800 µA
1 µA
±3.0 mV
±2 µV/°C
±100
nA
±10 nA
VSS
VDD
V
60 dB
70 dB
85 dB
90 mV
90 mV
±1.0 µA
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Maxim Integrated 3

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MAX4245/MAX4246/
MAX4247
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
Electrical Characteristics (continued)
(VDD = +2.7V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL connected from OUT to VDD / 2, SHDN_ = VDD (MAX4245/MAX4247 only),
TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
SHDN_ Logic Low
VIL (Note 2)
0.3 x VDD
SHDN_ Logic High
SHDN_ Input Current
VIH
IL/IH
(Note 2)
VSS ≤ SHDN_ ≤ VDD (Notes 2, 3)
0.7 x VDD
100
Note 1: Specifications are 100% tested at TA = +25°C. All temperature limits are guaranteed by design.
Note 2: Shutdown mode is only available in MAX4245 and MAX4247.
Note 3: Guaranteed by design, not production tested.
Note 4: For -40°C to +85°C, Input Common-Mode Range is VSS - 0.1V ≤ VCM ≤ VDD + 0.1V.
UNITS
V
V
nA
Typical Operating Characteristics
(VDD = 2.7V, VSS = VCM = 0V, VOUT = VDD / 2, no load, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT PER AMPLIFIER
vs. SUPPLY VOLTAGE
500
450 TA = +125°C
400 TA = +85°C
350 TA = +25°C
300
TA = -40°C
250
MAX4245/MAX4247
SHUTDOWN SUPPLY CURRENT
PER AMPLIFIER vs. TEMPERATURE
200
160
120
80
40
INPUT OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
600
VDD = 2.5V
500
TA = +125°C
TA = +85°C
400
TA = +25°C
300
200 TA = -40°C
100
200
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VDD (V)
0
-40
15 70
TEMPERATURE (°C)
125
0
0 0.5 1.0 1.5 2.0 2.5
VCM (V)
INPUT OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
600
VDD = 5.5V
500
TA = +125°C
TA = +85°C
400
300 TA = +25°C
200
TA = -40°C
100
0
0123456
VCM (V)
350
300
250
200
150
100
50
0
-40
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
VDD = 2.5V
VDD = 5.5V
15 70
TEMPERATURE (°C)
125
INPUT BIAS CURRENT
vs. COMMON-MODE VOLTAGE
20
VDD = 5.5V
15
TA = -40°C
10
TA = +125°C
5
TA = +85°C
0
-5
-10
TA = +25°C
-15
0123456
VCM (V)
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Maxim Integrated 4

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MAX4245/MAX4246/
MAX4247
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
Typical Operating Characteristics
(VDD = 2.7V, VSS = VCM = 0V, VOUT = VDD / 2, no load, TA = +25°C, unless otherwise noted.)
OUTPUT SOURCE CURRENT
vs. OUTPUT VOLTAGE
14
12 VDD = 5.5V
10
8
6 VDD = 2.5V
4
2
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VOUT (V)
OUTPUT SWING LOW
vs. TEMPERATURE
40
30
RL = 2k
20
10
RL = 100k
0
-40
15 70
TEMPERATURE (°C)
125
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. INPUT FREQUENCY
1
RL = 100k
AV = +1
VOUT = 2VP-P
0.1 VDD = 5.0V
MAX4245 toc13
0.01
0.001
0.0001
100
1000 10,000
INPUT FREQUENCY (Hz)
100,000
OUTPUT SINK CURRENT
vs. OUTPUT VOLTAGE
50
45
40
35
30 VDD = 5.5V
25
20 VDD = 2.5V
15
10
5
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VOUT (V)
CROSSTALK vs. FREQUENCY
-50
-70
-90
-110
-130
0.001 0.01 0.1 1 10 100 1000 10,000
FREQUENCY (kHz)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. AMPLITUDE
10
RL = 100k
AV = +1
1 fIN = 1kHz
VDD = 5.0V
0.1
0.01
0.001
OUTPUT SWING HIGH
vs. TEMPERATURE
40
30
RL = 2k
20
10 RL = 100k
0
-40
15 70
TEMPERATURE (°C)
125
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
0.1
10 10 100 1000 10,000
FREQUENCY (kHz)
GAIN AND PHASE vs. FREQUENCY
80 90MAX4245 toc15
NO LOAD
60 30
40 -30
20
PHASE
-90
GAIN
0 -150
-20 -210
0.0001
0
12 34
OUTPUT VOLTAGE (VP-P)
5
-40
0.1
-270
1 10 100 1000 10,000
FREQUENCY (kHz)
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Maxim Integrated 5