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MAX9943AUA+T-MAX9944ASA+
High-Voltage, Precision, Low-Power Op Amps
General Description
The MAX9943/MAX9944 is a family of high-voltage
amplifiers that offers precision, low drift, and low-power
consumption.
The MAX9943 (single) and MAX9944 (dual) op amps
offer 2.4MHz of gain-bandwidth product with only
550µA of supply current per amplifier.
The MAX9943/MAX9944 family has a wide power sup-
ply range operating from ±3V to ±19V dual supplies or
a 6V to 38V single supply.
The MAX9943/MAX9944 is ideal for sensor signal condi-
tioning, high-performance industrial instrumentation and
loop-powered systems (e.g., 4mA–20mA transmitters).
The MAX9943 is offered in a space-saving 6-pin TDFN or
8-pin µMAX®package. The MAX9944 is offered in an
8-pin SO or an 8-pin TDFN package. These devices are
specified over the -40°C to +125°C automotive tempera-
ture range.
Applications
Sensor Interfaces
Loop-Powered Systems
Industrial Instrumentation
High-Voltage ATE
High-Performance ADC/DAC Input/Output
Amplifiers
FeaturesWide 6V to 38V Supply RangeLow 100µV (max) Input Offset VoltageLow 0.4µV/°C Offset DriftUnity Gain Stable with 1nF Load Capacitance2.4MHz Gain-Bandwidth Product 550µA Supply Current 20mA Output Current Rail-to-Rail OutputPackage Options
3mm x 5mm, 8-Pin µMAX or 3mm x 3mm, 6-Pin
TDFN Packages (Single)
5mm x 6mm, 8-Pin SO or 3mm x 3mm, 8-Pin
TDFN Packages (Dual)
MAX9943/MAX9944
High-Voltage, Precision, Low-Power Op Amps
19-4433; Rev 3; 4/11
IN+
OUT
VEE
IN-
VCC
N.C.
MAX9943
TOP VIEW
*EP
TOP VIEW
6 TDFN-EP
*EP = EXPOSED PAD.
Package Detail
Ordering Information
PARTTEMP RANGEPIN-
PACKAGE
TOP
MARK
MAX9943AUA+-40°C to +125°C8 µMAXAACA
MAX9943ATT+-40°C to +125°C6 TDFN-EP*AUF
MAX9944ASA+-40°C to +125°C8 SO—
MAX9944ATA+-40°C to +125°C8 TDFN-EP*BLN
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
MAX9943 toc17
RLOAD (Ω)
LOAD
(pF)
100010,000
10,000
100,000
100100,000
STABLE
UNSTABLE
Capacitive Load vs. Resistive Load
µMAX is a registered trademark of Maxim Integrated Products, Inc.
MAX9943/MAX9944
High-Voltage, Precision, Low-Power Op Amps
ABSOLUTE MAXIMUM RATINGS
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)..................................-0.3V to +40V
All Other Pins (Note 1).....................(VEE- 0.3V) to (VCC+ 0.3V)
OUT Short-Circuit Current Duration
8-Pin µMAX (VCC- VEE≤20V)...............................................3s
8-Pin µMAX (VCC- VEE> 20V)................................Momentary
6-Pin TDFN (VCC- VEE≤20V).............................................60s
6-Pin TDFN (VCC- VEE> 20V)...............................................2s
8-Pin SO (VCC- VEE≤20V).................................................60s
8-Pin SO (VCC- VEE> 20V)...................................................2s
8-Pin TDFN (VCC- VEE≤20V).............................................60s
8-Pin TDFN (VCC- VEE> 20V)...............................................2s
Continuous Input Current (Any Pins)................................±20mA
Thermal Limits (Note 2)
Multiple Layer PCB
Continuous Power Dissipation (TA= +70°C)
8-Pin µMAX (derate 4.8mW/°C above +70°C)...........387.8mW
6-Pin TDFN-EP (derate 23.8mW/°C above +70°C)..1904.8mW
8-Pin SO (derate 7.6mW/°C above +70°C)...................606.1W
8-Pin TDFN-EP (derate 24.4mW/°C above +70°C)..1951.2mW
Operating Temperature Range.........................-40°C to +125°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s).................................+300°C
Soldering Temperature (reflow).......................................+260°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
DC CHARACTERISTICS
Operating Supply Voltage RangeVSUPPLYGuaranteed by PSRR test±3±19V
Quiescent Supply Current per
AmplifierICC550950µA
Power-Supply Rejection RatioPSRRVS = ±3V to ±19V105130dB
TA = +25°C20100Input Offset VoltageVOSTA = -40°C to +125°C240µV
Input Offset Voltage DriftTCVOS0.4µV/°C
VEE + 0.3V ≤ VCM ≤ VCC - 1.8V420Input Bias CurrentIBIASVEE ≤ VCM ≤ VCC - 1.8V90nA
Input Offset CurrentIOSVEE ≤ VCM ≤ VCC - 1.8V110nA
Input Voltage RangeVIN+ , VIN-Guaranteed by CMRR test,
TA = -40°C to +125°CVEEVCC -
1.8V
VEE + 0.3V ≤ VCM ≤ VCC - 1.8V105125Common-Mode Rejection RatioCMRRVEE ≤ VCM ≤ VCC - 1.8V105dB
ELECTRICAL CHARACTERISTICS
(VCC= 15V, VEE= -15V, VCM= 0V, RL= 10kΩto GND, VGND= 0V, TA= -40°C to +125°C. Typical values are at TA= +25°C, unless
otherwise noted.) (Note 3)
Note 1:Operation is limited by thermal limits.
Note 2:Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to /thermal-tutorial.
8 µMAX
Junction-to-Ambient Thermal Resistance (θJA)......206.3°C/W
Junction-to-Ambient Case Resistance (θJC)...............42°C/W
6 TDFN-EP
Junction-to-Ambient Thermal Resistance (θJA)...........42°C/W
Junction-to-Ambient Case Resistance (θJC).................9°C/W
8 SO
Junction-to-Ambient Thermal Resistance (θJA).........132°C/W
Junction-to-Ambient Case Resistance (θJC)...............38°C/W
8 TDFN-EP
Junction-to-Ambient Thermal Resistance (θJA)...........41°C/W
Junction-to-Ambient Case Resistance (θJC).................8°C/W
PACKAGE THERMAL CHARACTERISTICS (Note 2)
MAX9943/MAX9944
High-Voltage, Precision, Low-Power Op Amps
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
-13.5V ≤ VO ≤ +13.5V, RL = 10kΩ,
TA = +25°C115130
-13.5V ≤ VO ≤ +13.5V, RL = 10kΩ,
TA = -40°C to +125°C100
-12V ≤ VO ≤ +12V, RL = 600Ω,
TA = +25°C100110
Open-Loop GainAVOL
-12V ≤ VO ≤ +12V, RL = 600Ω,
TA = -40°C to +85°C90
RL = 10kΩVCC -
TA = +25°CVCC -
VOH
RL = 600Ω
TA = -40°C to +85°CVCC - 2
RL = 10kΩVEE +
TA = +25°CVEE +
Output Voltage Swing
VOL
RL = 600Ω
TA = -40°C to +85°CVEE +
TA = +25°C60Short-Circuit CurrentISCTA = -40°C to +125°C100mA
AC CHARACTERISTICS
Gain Bandwidth ProductGBWP2.4MHz
Slew RateSR-5V ≤ VOUT ≤ +5V0.35V/µs
Input Voltage Noise Densityenf = 1kHz17.6nV/√Hz
Input Voltage NoiseTOTAL NOISE0.1Hz ≤ f ≤ 10Hz500nVP-P
Input Current Noise DensityInf = 1kHz0.18pA/√Hz
Capacitive LoadingCLOADNo sustained oscillation1000pF
ELECTRICAL CHARACTERISTICS (continued)
(VCC= 15V, VEE= -15V, VCM= 0V, RL= 10kΩto GND, VGND= 0V, TA= -40°C to +125°C. Typical values are at TA= +25°C, unless
otherwise noted.) (Note 3)
Note 3:All devices are 100% production tested at TA= +25°C. Temperature limits are guaranteed by design.
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9943 toc03
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
SUPPLY CURRENT vs. TEMPERATURE
MAX9943 toc04
TEMPERATURE (°C)
SUPPLY CURRENT (
OFFSET VOLTAGE vs. SUPPLY VOLTAGE
MAX9943 toc05
SUPPLY VOLTAGE (V)
OFFSET VOLTAGE (
OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
MAX9943 toc06
COMMON-MODE VOLTAGE (V)
OFFSET VOLTAGE (
OFFSET VOLTAGE vs. TEMPERATURE
MAX9943 toc07
TEMPERATURE (°C)
OFFSET VOLTAGE (
MAX9943/MAX9944
High-Voltage, Precision, Low-Power Op Amps
Typical Operating Characteristics
(VCC= 15V, VEE= -15V, VCM= 0V, RL= 10kΩto GND, VGND= 0V, TA= +25°C, unless otherwise noted.)
OFFSET VOLTAGE HISTOGRAM
MAX9943 toc01
OFFSET VOLTAGE (µV)
FREQUENCY (%)
INPUT VOLTAGE OFFSET
DRIFT HISTOGRAM
MAX9943 toc02
VOS DRIFT (µV/°C)
FREQUENCY (%)
INPUT BIAS CURRENT
vs. COMMON-MODE VOLTAGE
MAX9943 toc08
COMMON-MODE VOLTAGE (V)
INPUT BIAS CURRENT (nA)
COMMON-MODE REJECTION
RATIO vs. FREQUENCY
MAX9943 toc10
FREQUENCY (kHz)
CMRR (dB)
0.00110,000
VOH vs. OUTPUT CURRENT
MAX9943 toc12
OUTPUT VOLTAGE (V)
TA = +85°C
TA = +25°C
TA = -40°C
OUTPUT CURRENT (mA)
TA = +125°C
INPUT BIAS CURRENT
vs. SUPPLY VOLTAGE
MAX9943 toc09
SUPPLY VOLTAGE (V)
INPUT BIAS CURRENT (nA)
POWER-SUPPLY REJECTION
RATIO vs. FREQUENCY
MAX9943 toc11
FREQUENCY (kHz)
PSRR (dB)
0.00110,000
VOL vs. OUTPUT CURRENT
MAX9943 toc13
OUTPUT VOLTAGE (V)
TA = +85°C
TA = +125°C
TA = -40°C
TA = +25°C
OUTPUT CURRENT (mA)
MAX9943/MAX9944
High-Voltage, Precision, Low-Power Op Amps
Typical Operating Characteristics (continued)
(VCC= 15V, VEE= -15V, VCM= 0V, RL= 10kΩto GND, VGND= 0V, TA= +25°C, unless otherwise noted.)
MAX9943/MAX9944
High-Voltage, Precision, Low-Power Op Amps
Typical Operating Characteristics (continued)
(VCC= 15V, VEE= -15V, VCM= 0V, RL= 10kΩto GND, VGND= 0V, TA= +25°C, unless otherwise noted.)
OUTPUT IMPEDANCE vs. FREQUENCY
MAX9943 toc14
FREQUENCY (kHz)
OUTPUT IMPEDANCE (
0.110,000
INPUT VOLTAGE NOISE
vs. FREQUENCY
MAX9943 toc15
FREQUENCY (Hz)
10,000100010010
100100,000
INPUT VOLTAGE NOISE (nV/
Hz)
CAPACITIVE LOAD vs. RESISTIVE LOAD
MAX9943 toc17
RLOAD (Ω)
LOAD
(pF)
100010,000
10,000
100,000
100100,000
STABLE
UNSTABLE
OPEN-LOOP GAIN vs. FREQUENCY
MAX9943 toc16
FREQUENCY (kHz)
OPEN-LOOP GAIN (dB)
0.00001100010,000
1μs/div
SMALL SIGNAL-STEP RESPONSE
20mV/div
MAX9943 toc18
OUT
10μs/div
LARGE SIGNAL-STEP RESPONSE
1V/div
MAX9943 toc19
OUT
Detailed Description
The MAX9943/MAX9944 are single/dual operational
amplifiers designed for industrial applications. They
operate from 6V to 38V supply range while maintaining
excellent performance. These devices utilize a three-
stage architecture optimized for low offset voltage and
low input noise with only 550µA supply current. The
devices are unity gain stable with a 1nF capacitive
load. These well-matched devices guarantee the high
open-loop gain, CMRR, PSRR, and low voltage offset.
The MAX9943/MAX9944 provide a wide input/output
voltage range. The input terminals of the MAX9943/
MAX9944 are protected from excessive differential volt-
age with back-to-back diodes. The input signal current
is also limited by an internal series resistor. With a 40V
differential voltage, the input current is limited to 20mA.
The output can swing to the negative rail while deliver-
ing 20mA of current, which is ideal for loop-powered
system applications. The specifications and operation
of the MAX9943/MAX9944 family is guaranteed over the
-40°C to +125°C temperature range.
Application Information
Bias Current vs. Input Common Mode
TheMAX9943/MAX9944 use an internal bias current
cancellation circuit to achieve very low bias current over
a wide input common-mode range. For such a circuit to
function properly, the input common mode must be at
least 300mV away from the negative supply VEE. The
input common mode can reach the negative supply
VEE. However, in the region between VEEand VEE+
0.3V, there is an increase in bias current for both inputs.
Capacitive Load Stability
Driving large capacitive loads can cause instability in
many op amps. The MAX9943/MAX9944 are stable with
capacitive loads up to 1nF. The Capacitive Load vs.
Resistive Load graph in the TypicalOperating
Characteristics gives the stable operation region for
capacitive versus resistive loads. Stability with higher
capacitive loads can be improved by adding an isola-
tion resistor in series with the op-amp output, as shown
in Figure 1. This resistor improves the circuit’s phase
margin by isolating the load capacitor from the amplifi-
er’s output.
MAX9943/MAX9944
High-Voltage, Precision, Low-Power Op Amps
Pin Description
MAX9943
6 TDFN-EP
MAX9943
8 µMAX
MAX9944
8 SO/TDFN-EPNAMEFUNCTION6—OUTOutput—1OUTAOutput A—7OUTBOutput B4VEENegative Power Supply. Bypass with a 0.1µF capacitor to ground.3—IN+Positive Input—3INA+Positive Input A—5INB+Positive Input B2—IN-Negative Input—2INA-Negative Input A—6INB-Negative Input B1, 5, 8—N.C.No Connection8VCCPositive Power Supply. Bypass with a 0.1µF capacitor to ground.—EPExposed Pad (TDFN Only). Connect to a large VEE plane to maximize
thermal performance. Not intended as an electrical connection point.
MAX9943/MAX9944
Power Supplies and Layout
The MAX9943/MAX9944 can operate with dual supplies
from ±3V to ±19V or with a single supply from +6V to
+38V with respect to ground. When used with dual sup-
plies, bypass both VCCand VEEwith their own 0.1µF
capacitor to ground. When used with a single supply,
bypass VCCwith a 0.1µF capacitor to ground. Careful
layout technique helps 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.
Output Current Capability
The MAX9943/MAX9944 are capable of driving heavy
loads such as the ones that can be found in loop-pow-
ered systems for remote sensors. The information is
transmitted through ±20mA or 4mA–20mA current output
across long lines that are terminated with low resistance
loads (e.g., 600Ω). The Typical Application Circuitshows
the MAX9944 used as a voltage-to-current converter with
a current-sense amplifier in the feedback loop. Because
of the high output current capability of the MAX9944, the
device can be used to directly drive the current-loop.
The specifications and operation of the MAX9943/
MAX9944 family is guaranteed over the -40°C to
+125°C temperature range, However, when used in
applications with ±15V supply voltage (see Figure 3),
the capability of driving more than ±20mA of current is
limited to the -40°C to +85°C temperature range. Use a
lower supply voltage if this current must be delivered at
a higher temperature range.
Input Common Mode and Output Swing
The MAX9943/MAX9944 input common-mode range
can swing to the negative rail VEE. The output voltage
can swing to both the positive VCCand the negative
VEErails if the output stage is not heavily loaded. These
two features are very important for applications where
the MAX9943/ MAX9944 are used with a single-supply
(VEEconnected to ground). One of the applications that
can benefit from these features is when the single-sup-
ply op amp is driving an ADC.
Input Differential Voltage Protection
During normal op-amp operation, the inverting and non-
inverting inputs of the MAX9943/MAX9944 are at essen-
tially the same voltage. However, either due to fast
input voltage transients or due to other fault conditions,
these pins can be forced to be at two different voltages.
Internal back-to-back diodes and series resistors pro-
tect the inputs from an excessive differential voltage
(see Figure 2). Therefore, IN+ and IN- can be any volt-
age within the range shown in the absolute maximum
rating. Note the protection time is still dependent on the
package thermal limits.
Chip Information
PROCESS: BiCMOS
High-Voltage, Precision, Low-Power Op Amps
RISO
INPUT
OUTPUTMAX9943
Figure 1. Capacitive Load Driving Circuit
1.5kΩ
1.5kΩ
Figure 2. Input Protection Circuit

Partno	Mfg	Dc	Qty	Available	Descript
MAX9943AUA+T \|MAX9943AUAT	MAXIM	N/a	2500	avai	High-Voltage, Precision, Low-Power Op Amps
MAX9944ASA+ \|MAX9944ASA	MAXIM	N/a	1000	avai	High-Voltage, Precision, Low-Power Op Amps
MAX9944ASA+ \|MAX9944ASA	MAX	N/a	2500	avai	High-Voltage, Precision, Low-Power Op Amps