MAX4294ESD ,Quad, ultra-small, single supply +1.8V to +5.5V or dual supples +-0.9V to +-2.75V, micropower, Rail-to-Rail I/O op amp.FeaturesThe MAX4291/MAX4292/MAX4294 family of micropow- Ultra-Low Voltage Operation—Guaranteed Dow ..
MAX4294ESD+T ,Ultra-Small, +1.8V, µPower, Rail-to-Rail I/O Op Ampsapplications.♦ Rail-to-Rail Input Common-Mode RangeThe MAX4291/MAX4292/MAX4294 have an input com-mo ..
MAX4294EUD+ ,Ultra-Small, +1.8V, µPower, Rail-to-Rail I/O Op AmpsELECTRICAL CHARACTERISTICS (continued)(V = 1.8V to 5.5V, V = V = 0, V = V /2, R = 100kΩ connected t ..
MAX4298EUB ,Ultra-High PSRR Stereo Drivers + Microphone Amp + 100mA Linear Regulator
MAX4298EUB ,Ultra-High PSRR Stereo Drivers + Microphone Amp + 100mA Linear Regulator
MAX4298EUB ,Ultra-High PSRR Stereo Drivers + Microphone Amp + 100mA Linear Regulator
MAX811TEUS-T ,Microprocessor voltage monitor with manual reset input. Reset threshold voltage 3.08VMAX811/MAX81219-0411; Rev 3; 3/994-Pin µP Voltage Monitors with Manual Reset Input________________
MAX812LEUS ,4-Pin µP Voltage Monitors with Manual Reset InputApplicationsSelect the letter corresponding to the desired nominal resetthreshold voltage, and inse ..
MAX812LEUS+T ,4-Pin µP Voltage Monitors with Manual Reset InputGeneral Description Benefits and
MAX812LEUS-T ,Microprocessor voltage monitor with manual reset input. Reset threshold voltage 4.63V. Push-pull active-high reset output.General Description ________
MAX812LEUS-T ,Microprocessor voltage monitor with manual reset input. Reset threshold voltage 4.63V. Push-pull active-high reset output.Applicationsto complete the part number.ComputersRESET THRESHOLDControllersSUFFIX VOLTAGE (V)Intell ..
MAX812MEUS ,4-Pin µP Voltage Monitors with Manual Reset InputElectrical Characteristics(V = 5V for L/M versions, V = 3.3V for T/S versions, V = 3V for R version ..
MAX4292ESA-MAX4292EUA-MAX4294ESD
Dual, ultra-small, single supply +1.8V to +5.5V or dual supples +-0.9V to +-2.75V, micropower, Rail-to-Rail I/O op amp.
MAX4291/MAX4292/MAX4294
Ultra-Small, +1.8V, µPower,
Rail-to-Rail I/O Op Amps19-1612; Rev 0; 3/00
Pin ConfigurationsRail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Ordering Information
Selector Guide
General DescriptionThe MAX4291/MAX4292/MAX4294 family of micropow-
er operational amplifiers operates from a +1.8V to
+5.5V single supply or ±0.9V to ±2.75V dual supplies
and has Rail-to-Rail®input/output capabilities. These
amplifiers provide a 500kHz gain-bandwidth product
and 120dB open-loop voltage gain while using only
100µA of supply current per amplifier. The combination
of low input offset voltage (±400µV) and high-open-loop
gain makes them suitable for low-power/low-voltage
high-precision applications.
The MAX4291/MAX4292/MAX4294 have an input com-
mon-mode range that extends to each supply rail, and
their outputs typically swing within 20mV of the rails with
a 2kΩload. Although the minimum operating voltage is
specified at +1.8V, these devices typically operate down
to +1.5V. The combination of ultra-low-voltage operation,
rail-to-rail inputs/output, and low-power consumption
makes these devices ideal for any portable/two-cell bat-
tery-powered system.
The single MAX4291 is offered in an ultra-small 5-pin
SC70 package and the dual MAX4292 is offered in a
space-saving 8-pin µMAX package.
Applications2-Cell Battery-Operated Systems
Portable Electronic Equipment
Battery-Powered Instrumentation
Digital Scales
Strain Gauges
Sensor Amplifiers
Cellular Phones
FeaturesUltra-Low Voltage Operation—Guaranteed Down
to +1.8V100µA Supply Current per Amplifier500kHz Gain-Bandwidth Product120dB Open-Loop Voltage Gain (RL= 100kΩ)0.017% THD + Noise at 1kHzRail-to-Rail Input Common-Mode RangeRail-to-Rail Output Drives 2kΩLoadNo Phase Reversal for Overdriven InputsUnity-Gain Stable for Capacitive Loads up to 100pF400µV Input Offset VoltageSingle Available in Ultra-Small 5-Pin SC70
Dual Available in Space-Saving 8-Pin µMAX*Future product—contact factory for availability.
MAX4291/MAX4292/MAX4294
Ultra-Small, +1.8V, µPower,
Rail-to-Rail I/O Op Amps
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= +1.8V to +5.5V, VEE= VCM= 0, VOUT= VCC / 2, RL= 100kΩconnected to VCC / 2, TA
= +25°C, unless otherwise noted.)(Note 1)
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.
Supply Voltage (VCCto VEE)..................................................+6V
All Other Pins...................................(VCC+ 0.3V) to (VEE- 0.3V)
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (TA= +70°C)
5-Pin SC70 (derate 2.5mW/°C above +70°C)................200mW
5-Pin SOT23 (derate 7.1mW/°C above +70°C)................571mW
8-Pin µMAX (derate 4.10mW/°C above +70°C)..............330mW
8-Pin SO (derate 5.88mW/°C above +70°C)..................471mW
14-Pin SO (derate 8.33mW/°C above +70°C)................667mW
14-Pin TSSOP (derate 6.3mW/°C above +70°C)............500mW
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
MAX4291/MAX4292/MAX4294
Ultra-Small, +1.8V, µPower,
Rail-to-Rail I/O Op Amps
ELECTRICAL CHARACTERISTICS(VCC= +1.8V to +5.5V, VEE= VCM= 0, VOUT= VCC / 2, RL= 100kΩconnected to VCC / 2, TA
= TMINto TMAX, unless otherwisenoted.) (Note 1)
ELECTRICAL CHARACTERISTICS(VCC= +1.8V to +5.5V, VEE= VCM= 0, VOUT= VCC / 2, RL= 100kΩconnected to VCC / 2, TA
= +25°C, unless otherwise noted.)(Note 1)
Ultra-Small, +1.8V, µPower,
Rail-to-Rail I/O Op Amps
Note 1:All devices are 100% tested at TA= +25°C. All temperature limits are guaranteed by design.
ELECTRICAL CHARACTERISTICS(VCC= +1.8V to +5.5V, VEE= VCM= 0, VOUT= VCC / 2, RL= 100kΩconnected to VCC / 2, TA
= TMINto TMAX, unless otherwisenoted.) (Note 1)
MAX4291/MAX4292/MAX4294
Ultra-Small, +1.8V, µPower,
Rail-to-Rail I/O Op Amps
MAX4291/MAX4292/MAX4294MINIMUM OPERATING VOLTAGE
vs. TEMPERATURE (PSRR ≥80dB)
MAX4291 toc02
TEMPERATURE (°C)
MINIMUM OPERATING VOLTAGE (V)
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
MAX4291 toc03
TEMPERATURE (°C)
INPUT OFFSET VOLTAGE (
INPUT BIAS CURRENT
vs. TEMPERATURE
MAX4291 toc04
TEMPERATURE (°C)
INPUT BIAS CURRENT (nA)
INPUT BIAS CURRENT vs. COMMON-MODE
VOLTAGE (VCC = 1.8V)
MAX4291 toc05
COMMON-MODE VOLTAGE (V)
INPUT BIAS CURRENT (nA)
INPUT BIAS CURRENT vs. COMMON-MODE
VOLTAGE (VCC = 5.5V)
MAX4291 toc06
COMMON-MODE VOLTAGE (V)
INPUT BIAS CURRENT (nA)
OUTPUT VOLTAGE SWING vs.
TEMPERATURE (RL = 100kΩ to VCC / 2)
MAX4291 toc07
TEMPERATURE (°C)
OUTPUT VOLTAGE SWING (mV)
OUTPUT VOLTAGE SWING vs.
TEMPERATURE (RL = 2kΩ to VCC / 2)
MAX4291 toc08
TEMPERATURE (°C)
OUTPUT VOLTAGE SWING (mV)
COMMON-MODE REJECTION
RATIO vs. TEMPERATURE
MAX4291 toc09
TEMPERATURE (°C)
CMRR (dB)
Typical Operating Characteristics(VCC= +2.4V, VEE= VCM= 0, VOUT= VCC / 2, no load, TA= +25°C, unless otherwise noted.)
MAX4291/MAX4292/MAX4294
Ultra-Small, +1.8V, µPower,
Rail-to-Rail I/O Op Amps
Typical Operating Characteristics (continued)(VCC= +2.4V, VEE= VCM= 0, VOUT= VCC / 2, no load, TA= +25°C, unless otherwise noted.)
MAX4291/MAX4292/MAX4294
Ultra-Small, +1.8V, µPower,
Rail-to-Rail I/O Op AmpsLOAD RESISTOR vs. CAPACITIVE LOAD
MAX4291 toc19
CAPACITIVE LOAD (nF)
LOAD RESISTOR (k
OUT
100mV
100mV
1µs/div
SMALL-SIGNAL TRANSIENT RESPONSE
(NONINVERTING CONFIGURATION)MAX4291 toc20
OUT
100mV
100mV
1µs/div
SMALL-SIGNAL TRANSIENT RESPONSE
(INVERTING CONFIGURATION)MAX4291 toc21
OUT
-2V
+2V
-2V
+2V
10µs/div
LARGE-SIGNAL TRANSIENT RESPONSE
(NONINVERTING CONFIGURATION)MAX4291 toc22
OUT
-2V
+2V
-2V
+2V
10µs/div
LARGE-SIGNAL TRANSIENT RESPONSE
(INVERTING CONFIGURATION)MAX4291 toc23
SUPPLY CURRENT vs. SINK CURRENT
MAX4291/2/4-24
SINK CURRENT (mA)
SUPPLY CURRENT (
SUPPLY CURRENT vs. SOURCE CURRENT
MAX4291/2/4-25
SOURCE CURRENT (mA)
SUPPLY CURRENT (
Typical Operating Characteristics (continued)(VCC= +2.4V, VEE= VCM= 0, VOUT= VCC / 2, no load, TA= +25°C, unless otherwise noted.)
Detailed Description
Rail-to-Rail Input StageThe MAX4291/MAX4292/MAX4294 have rail-to-rail
inputs and output stages that are specifically designed
for low-voltage, single-supply operation. The input
stage consists of separate NPN and PNP differential
stages, which operate together to provide a common-
mode range extending to both supply rails. The
crossover region of these two pairs occurs halfway
between VCCand VEE. The input offset voltage is typi-
cally ±400µV. Low operating supply voltage, low sup-
ply current, rail-to-rail common-mode input range, and
rail-to-rail outputs make this family of operational ampli-
fiers (op amps) an excellent choice for precision or
general-purpose, low-voltage, battery-powered sys-
tems.
Since the input stage consists of NPN and PNP pairs,
the input bias current changes polarity as the common-
mode voltage passes through the crossover region.
Match the effective impedance seen by each input to
reduce the offset error caused by input bias currents
flowing through external source impedances (Figures
1a and 1b).
The combination of high source impedance plus input
capacitance (amplifier input capacitance plus stray
capacitance) creates a parasitic pole that produces an
underdamped signal response. Reducing input capaci-
tance or placing a small capacitor across the feedback
resistor improves response in this case.
MAX4291/MAX4292/MAX4294
Ultra-Small, +1.8V, µPower,
Rail-to-Rail I/O Op Amps
Pin Description
