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 supply
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 Ampliers
Features
● Wide 6V to 38V Supply Range
● Low 100μV (max) Input Offset Voltage
● Low 0.4μV/°C Offset Drift
● Unity Gain Stable with 1nF Load Capacitance
● 2.4MHz Gain-Bandwidth Product
● 550μA Supply Current
● 20mA Output Current
● Rail-to-Rail Output
● Package 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)
19-4433; Rev 4; 10/17
μMAX is a registered trademark of Maxim Integrated Products, Inc.
Pin Configurations appear at end of data sheet.
R
LOAD
(Ω)
C
LOAD
(pF)
1000 10,000
1000
10,000
100,000
100
100 100,000
STABLE
UNSTABLE
MAX9943/MAX9944 High-Voltage, Precision, Low-Power Op Amps
Capacitive Load vs. Resistive Load
Supply Voltage (V
CC
to V
EE
) ................................-0.3V to +40V
All Other Pins (Note 1) ..................(V
EE
- 0.3V) to (V
CC
+ 0.3V)
OUT Short-Circuit Current Duration
8-Pin μMAX (V
CC
- V
EE
≤ 20V) .......................................... 3s
8-Pin μMAX (V
CC
- V
EE
> 20V) ............................ Momentary
6-Pin TDFN (V
CC
- V
EE
≤ 20V) ........................................ .60s
6-Pin TDFN (V
CC
- V
EE
> 20V) .......................................... 2s
8-Pin SO (V
CC
- V
EE
≤ 20V) ............................................. 60s
8-Pin SO (V
CC
- V
EE
> 20V) ............................................... 2s
8-Pin TDFN (V
CC
- V
EE
≤ 20V) ......................................... 60s
8-Pin TDFN (V
CC
- V
EE
> 20V) .......................................... 2s
Continuous Input Current (Any Pins) ...............................±20mA
Thermal Limits (Note 2)
Multiple Layer PCB
Continuous Power Dissipation (T
A
= +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
(Note 2)
(V
CC
= 15V, V
EE
= -15V, V
CM
= 0V, R
L
= 10kΩ to GND, V
GND
= 0V, T
A
= -40°C to +125°C. Typical values are at T
A
= +25°C, unless
otherwise noted.) (Note 3)
Note 1: Operation is limited by thermal limits.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DC CHARACTERISTICS
Operating Supply Voltage Range V
SUPPLY
Guaranteed by PSRR test ±3 ±19 V
Quiescent Supply Current per
Amplier
I
CC
550 950 µA
Power-Supply Rejection Ratio PSRR V
S
= ±3V to ±19V 105 130 dB
Input Offset Voltage V
OS
T
A
= +25°C 20 100
µV
T
A
= -40°C to +125°C 240
Input Offset Voltage Drift TCV
OS
0.4 µV/°C
Input Bias Current I
BIAS
V
EE
+ 0.3V ≤ V
CM
≤ V
CC
- 1.8V 4 20
nA
V
EE
≤ V
CM
≤ V
CC
- 1.8V 90
Input Offset Current I
OS
V
EE
≤ V
CM
≤ V
CC
- 1.8V 1 10 nA
Input Voltage Range V
IN+
, V
IN-
Guaranteed by CMRR test,
T
A
= -40°C to +125°C
V
EE
V
CC
-
1.8
V
Common-Mode Rejection Ratio CMRR
V
EE
+ 0.3V ≤ V
CM
≤ V
CC
- 1.8V 105 125
dB
V
EE
≤ V
CM
≤ V
CC
- 1.8V 105
MAX9943/MAX9944 High-Voltage, Precision, Low-Power Op Amps
www.maximintegrated.com
Maxim Integrated
│
2
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.
Electrical Characteristics
8 μMAX
Junction-to-Ambient Thermal Resistance (θ
JA
) .....206.3°C/W
Junction-to-Ambient Case Resistance (θ
JC
) ...............42°C/W
6 TDFN-EP
Junction-to-Ambient Thermal Resistance (θ
JA
) ..........42°C/W
Junction-to-Ambient Case Resistance (θ
JC
) .................9°C/W
8 SO
Junction-to-Ambient Thermal Resistance (θ
JA
) ........132°C/W
Junction-to-Ambient Case Resistance (θ
JC
) ...............38°C/W
8 TDFN-EP
Junction-to-Ambient Thermal Resistance (θ
JA
) ..........41°C/W
Junction-to-Ambient Case Resistance (θ
JC
) .................8°C/W
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 www.maximintegrated.com/thermal-tutorial.
Package Thermal Characteristics