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EVALUATION KIT AVAILABLE
MAX4249–MAX4257
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
General Description
The MAX4249–MAX4257 low-noise, low-distortion oper-
ational amplifiers offer rail-to-rail outputs and single-
supply operation down to 2.4V. They draw 400µA of
quiescent supply current per amplifier while featuring
ultra-low distortion (0.0002% THD), as well as low input
voltage-noise density (7.9nV/!Hz) and low input
current-noise density (0.5fA/!Hz). These features make
the devices an ideal choice for portable/battery-powered
applications that require low distortion and/or low noise.
For additional power conservation, the MAX4249/
MAX4251/MAX4253/MAX4256 offer a low-power shut-
down mode that reduces supply current to 0.5µA and
puts the amplifiers’ outputs into a high-impedance
state. The MAX4249-MAX4257’s outputs swing rail-to-
rail and their input common-mode voltage range
includes ground. The MAX4250–MAX4254 are unity-
gain stable with a gain-bandwidth product of 3MHz.
The MAX4249/MAX4255/MAX4256/MAX4257 are inter-
nally compensated for gains of 10V/V or greater with a
gain-bandwidth product of 22MHz. The single MAX4250/
MAX4255 are available in space-saving 5-pin SOT23
packages. The MAX4252 is available in an 8-bump chip-
scale package (UCSP™) and the MAX4253 is available in
a 10-bump UCSP. The MAX4250AAUK comes in a 5-pin
SOT23 package and is specified for operation over the
automotive (-40°C to +125°C) temperature range.
Applications
Wireless Communications Devices
PA Control
Portable/Battery-Powered Equipment
Medical Instrumentation
ADC Buffers
Digital Scales/Strain Gauges
Features
o Available in Space-Saving UCSP, SOT23, and
µMAX® Packages
o Low Distortion: 0.0002% THD (1k" load)
o 400µA Quiescent Supply Current per Amplifier
o Single-Supply Operation from 2.4V to 5.5V
o Input Common-Mode Voltage Range Includes
Ground
o Outputs Swing Within 8mV of Rails with a 10k"
Load
o 3MHz GBW Product, Unity-Gain Stable
(MAX4250–MAX4254)
22MHz GBW Product, Stable with AV # 10V/V
(MAX4249/MAX4255/MAX4256/MAX4257)
o Excellent DC Characteristics
VOS = 70µV
IBIAS = 1pA
Large-Signal Voltage Gain = 116dB
o Low-Power Shutdown Mode
Reduces Supply Current to 0.5µA
Places Outputs in a High-Impedance State
o 400pF Capacitive-Load Handling Capability
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
MAX4249ESD+
-40°C to +85°C 14 SO
MAX4249EUB+
-40°C to +85°C 10 µMAX
MAX4250EUK+T -40°C to +85°C 5 SOT23
MAX4250AAUK+T -40°C to +125°C 5 SOT23
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
TOP
MARK
ACCI
AEYJ
Ordering Information continued at end of data sheet.
Selector Guide appears at end of data sheet.
Pin/Bump Configurations
TOP VIEW
(BUMPS ON BOTTOM)
1
A OUTA
2
VDD
3
OUTB
B INA- MAX4252 INB-
C INA+
VSS
INB+
A1
OUTB
B1
VDD
C1
OUTA
A2 A3
INB- INB+
MAX4253
C2 C3
INA- INA+
A4
SHDNB
B4
VSS
C4
SHDNA
UCSP
Pin/Bump Configurations continued at end of data sheet.
UCSP
UCSP is a trademark and µMAX is a registered trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct at
1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
19-1295; Rev 9; 12/12

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MAX4249–MAX4257
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
ABSOLUTE MAXIMUM RATINGS
Power-Supply Voltage (VDD to VSS) ......................+6.0V to -0.3V
Analog Input Voltage (IN_+, IN_-)....(VDD + 0.3V) to (VSS - 0.3V)
SHDN Input Voltage ......................................6.0V to (VSS - 0.3V)
Output Short-Circuit Duration to Either Supply ..........Continuous
Continuous Power Dissipation (TA = +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C)...........571mW
8-Bump UCSP (derate 4.7mW/°C above +70°C)........379mW
8-Pin µMAX (derate 4.5mW/°C above +70°C) ............362mW
8-Pin SO (derate 5.88mW/°C above +70°C)...............471mW
10-Bump UCSP (derate 6.1mW/°C above +70°C) ......484mW
10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW
14-Pin SO (derate 8.33mW/°C above +70°C)..............667mW
Operating Temperature Range ...........................-40°C to +85°C
MAX4250AAUK .............................................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°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 = 5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL connected to VDD/2, SHDN = VDD, TA = TMIN to TMAX, unless otherwise noted.
Typical values are at TA = +25°C.) (Notes 2, 3)
PARAMETER
Supply Voltage Range
Quiescent Supply Current Per
Amplifier
Input Offset Voltage (Note 5)
Input Offset Voltage Tempco
Input Bias Current
Input Offset Current
Differential Input Resistance
Input Common-Mode Voltage
Range
Common-Mode Rejection Ratio
SYMBOL
CONDITIONS
VDD (Note 4)
VDD = 3V
IQ
Normal
mode
VDD = 5V
E temperature
MAX4250AAUK
VDD = 5V, UCSP only
VOS
TCVOS
IB
IOS
RIN
VCM
CMRR
Shutdown mode (SHDN = VSS) (Note 2)
E temperature
MAX4250AAUK
(Note 6)
(Note 6)
TA = +25°C
TA = -40°C to +85°C
TA = -40°C to +125°C
TA = +25°C
TA = -40°C to +85°C
TA = -40°C to +125°C
Guaranteed by
CMRR test
VSS - 0.2V VCM
VDD - 1.1V
E temperature
MAX4250AAUK
E temperature
MAX4250AAUK
MIN TYP MAX UNITS
2.4 5.5 V
400
420 575
675
420 655
µA
0.5
±0.07
0.3
0.1
0.1
1.5
±0.75
±1.85
1
50
1500
1
10
100
mV
µV/°C
pA
pA
1000
G
-0.2
VDD -1.1
V
0 VDD -1.1
70 115
68
dB
2 Maxim Integrated

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MAX4249–MAX4257
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL connected to VDD/2, SHDN = VDD, TA = TMIN to TMAX, unless otherwise noted.
Typical values are at TA = +25°C.) (Notes 2, 3)
PARAMETER
Power-Supply Rejection Ratio
Large-Signal Voltage Gain
Output Voltage Swing
Output Voltage Swing
Output Short-Circuit Current
Output Leakage Current
SHDN Logic Low
SYMBOL
CONDITIONS
PSRR VDD – 2.4V to 5.5V
E temperature
MAX4250AAUK
RL = 10kto VDD/2; E temperature
VOUT = 25mV to VDD
– 4.97V
MAX4250AAUK
AV RL = 1kto VDD/2; E temperature
VOUT = 150V to VDD
– 4.75V
MAX4250AAUK
VOUT
|VIN+ - VIN-| 10mV;
RL = 10kto VDD/2
VDD - VOH
VOL - VSS
E
A
E
A
VOUT
|VIN+ - VIN-| 10mV,
RL = 1kto VDD/2
VDD - VOH
VOL - VSS
E
A
E
A
ISC
ILEAK
Shutdown mode (SHDN = VSS),
VOUT = VSS to VDD (Note 2)
VIL (Note 2)
MIN TYP MAX UNITS
75 100
72
dB
80 116
77
80 112
dB
77
8 25
30
7 20 mV
25
77 200
225 mV
47 100
125
68 mA
0.001
1.0
µA
0.2 X VDD
V
SHDN Logic High
VIH (Note 2)
0.8 X VDD
V
SHDN Input Current
IIL/IIH SHDN = VSS = VDD (Note 2)
0.5 1.5
µA
Input Capacitance
11 pF
Gain-Bandwidth Product
GBW
MAX4250–MAX4254
MAX4249/MAX4255/MAX4256/MAX4257
3
MHz
22
Slew Rate
Peak-to-Peak Input-Noise
Voltage
Input Voltage-Noise Density
Input Current-Noise Density
SR
enP-P
en
in
MAX4250–MAX4254
MAX4249/MAX4255/MAX4256/MAX4257
f = 0.1Hz to 10Hz
f = 10Hz
f = 1kHz
f = 30kHz
f = 1kHz
0.3
V/µs
2.1
760 nVP-P
27
8.9 nV/Hz
7.9
0.5 fA/Hz
Maxim Integrated
3

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MAX4249–MAX4257
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL connected to VDD/2, SHDN = VDD, TA = TMIN to TMAX, unless otherwise noted.
Typical values are at TA = +25°C.) (Notes 2, 3)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Total Harmonic Distortion Plus
Noise
THD+N
MAX4250–MAX4254
AV = 1V/V, VOUT = 2VP-P,
RL = 1kto GND
(Note 7)
MAX4249/MAX4255/
MAX4256/MAX4257
AV = 1V/V, VOUT = 2VP-P,
RL = 1kto GND (Note 7)
f = 1kHz
f = 20kHz
f = 1kHz
f = 20kHz
0.0004
0.006
0.0012
0.007
%
Capacitive-Load Stability
No sustained oscillations
400 pF
Gain Margin
Phase Margin
Settling Time
MAX4250–MAX4254, AV = 1V/V
GM MAX4249/MAX4255/MAX4256/MAX4257,
AV = 10V/V
MAX4250–MAX4254, AV = 1V/V
ΦM MAX4249/MAX4255/MAX4256/MAX4257,
AV = 10V/V
To 0.01%, VOUT
= 2V step
MAX4250–MAX4254
MAX4249/MAX4255/
MAX4256/MAX4257
10
dB
12.5
74
Degrees
68
6.7
1.6 µs
Delay Time to Shutdown
IVDD = 5% of
tSH normal
operation
MAX4251/MAX4253
MAX4249/MAX4256
0.8
µs
1.2
Delay Time to Enable
VOUT = 2.5V,
MAX4251/MAX4253
tEN VOUT settles to
0.1%
MAX4249/MAX4256
8
µs
3.5
Power-Up Delay Time
tPU VDD = 0 to 5V step, VOUT stable to 0.1%
6
µs
Note 2: SHDN is available on the MAX4249/MAX4251/MAX4253/MAX4256 only.
Note 3: All device specifications are 100% tested at TA = +25°C. Limits over temperature are guaranteed by design.
Note 4: Guaranteed by the PSRR test.
Note 5: Offset voltage prior to reflow on the UCSP.
Note 6: Guaranteed by design.
Note 7: Lowpass-filter bandwidth is 22kHz for f = 1kHz and 80kHz for f = 20kHz. Noise floor of test equipment = 10nV/!Hz.
4 Maxim Integrated

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MAX4249–MAX4257
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
Typical Operating Characteristics
(VDD = 5V, VSS = 0V, VCM = VOUT = VDD/2, input noise floor of test equipment =10nV/!Hz for all distortion measurements,
TA = +25°C, unless otherwise noted.)
MAX4251/MAX4256
INPUT OFFSET VOLTAGE DISTRIBUTION
40
400 UNITS
35 VCM = 0
TA = +25°C
30
25
20
OFFSET VOLTAGE
vs. TEMPERATURE
250
200 VCM = 0
150
100
50
0
INPUT OFFSET VOLTAGE
vs. INPUT COMMON-MODE VOLTAGE
200
150
100
15 -50
-100
10
-150
5 -200
50
VDD = 3V
VDD = 5V
0
0
VOS (µV)
-250
-40 -20
0
20 40 60 80
TEMPERATURE (°C)
-50
-0.5
0.5 1.5 2.5 3.5
INPUT COMMON-MODE VOLTAGE (V)
4.5
OUTPUT VOLTAGE
vs. OUTPUT LOAD CURRENT
0.6
VDD = 3V OR 5V
0.5 VDIFF = ±10mV
VDD - VOH
0.4
OUTPUT VOLTAGE SWING (VOH)
vs. TEMPERATURE
0.10
0.09
0.08 RL = 1kΩ
0.07
0.06
OUTPUT VOLTAGE SWING (VOL)
vs. TEMPERATURE
0.06
0.05 RL = 1kΩ
0.04
0.3 0.05
VOL 0.04
0.2 0.03
0.03
0.02
0.1
0
0 1 2 3 4 5 6 7 8 9 10
OUTPUT LOAD CURRENT (mA)
0.02
0.01
0
-40
-20
RL = 10kΩ
RL = 100kΩ
0 20 40 60
TEMPERATURE (°C)
80
0.01
0
-40 -20
RL = 10kΩ
RL = 100kΩ
0 20 40 60
TEMPERATURE (°C)
80
140
130
120
110
100
90
80
70
60
50
0
LARGE-SIGNAL VOLTAGE GAIN
vs. OUTPUT VOLTAGE SWING
RL = 200kΩ
RL = 20kΩ
RL = 2kΩ
VDD = 3V
RL REFERENCED TO GND
50 100 150 200 250
VOUT SWING FROM EITHER SUPPLY (mV)
140
130
120
110
100
90
80
70
60
0
LARGE-SIGNAL VOLTAGE GAIN
vs. OUTPUT VOLTAGE SWING
RL = 20kΩ
RL = 200kΩ
RL = 2kΩ
RL REFERENCEDVTDODG=N3DV
50 100 150 200 250
VOUT SWING FROM EITHER SUPPLY (mV)
LARGE-SIGNAL VOLTAGE GAIN
vs. OUTPUT VOLTAGE SWING
140
RL = 200kΩ
130
120
110 RL = 20kΩ
100
90
RL = 2kΩ
80
70
60
VDD = 5V
RL REFERENCED TO GND
50
0 50 100 150 200 250
VOUT SWING FROM EITHER SUPPLY (mV)
Maxim Integrated
5