EVALUATION KIT AVAILABLE
MAX4080/MAX4081
76V, High-Side, Current-Sense Amplifiers
with Voltage Output
General Description
The MAX4080/MAX4081 are high-side, current-sense
amplifiers with an input voltage range that extends from
4.5V to 76V making them ideal for telecom, automotive,
backplane, and other systems where high-voltage current
monitoring is critical. The MAX4080 is designed for unidirectional current-sense applications and the MAX4081
allows bidirectional current sensing. The MAX4081 single output pin continuously monitors the transition from
charge to discharge and avoids the need for a separate
polarity output. The MAX4081 requires an external reference to set the zero-current output level (VSENSE = 0V).
The charging current is represented by an output voltage
from VREF to VCC, while discharge current is given from
VREF to GND.
For maximum versatility, the 76V input voltage range
applies independently to both supply voltage (VCC) and
common-mode input voltage (VRS+). High-side current
monitoring does not interfere with the ground path of the
load being measured, making the MAX4080/MAX4081
particularly useful in a wide range of high-voltage systems.
The combination of three gain versions (5V/V, 20V/V,
60V/V = F, T, S suffix) and a user-selectable, external
sense resistor sets the full-scale current reading and its
proportional output voltage. The MAX4080/MAX4081
offer a high level of integration, resulting in a simple, accurate, and compact current-sense solution.
The MAX4080/MAX4081 operate from a 4.5V to 76V single supply and draw only 75µA of supply current. These
devices are specified over the automotive operating temperature range (-40°C to +125°C) and are available in a
space-saving 8-pin µMAX® or SO package.
Applications
●● Automotive (12V, 24V, or 42V Batteries)
●● 48V Telecom and Backplane Current Measurement
●● Bidirectional Motor Control
●● Power-Management Systems
●● Avalanche Photodiode and PIN-Diode Current
Monitoring
●● General System/Board-Level Current Sensing
●● Precision High-Voltage Current Sources
µMAX is a registered trademark of Maxim Integrated Products, Inc.
19-2562; Rev 5; 5/15
Benefits and Features
●● Ideal for High-Voltage Current Monitoring Applications
• Wide 4.5V to 76V Input Common-Mode Range
• Independent Operating Supply Voltage
●● High Accuracy and Low Quiescent Current Support
Precision Application Requirements
• ±0.1% Full-Scale Accuracy
• Low 100μV Input Offset Voltage
• Three Gain Versions Available
-- 5V/V (MAX4080F/MAX4081F)
-- 20V/V (MAX4080T/MAX4081T)
-- 60V/V (MAX4080S/MAX4081S)
• 75μA Supply Current (MAX4080)
●● Flexible Current Sensing Supports Monitoring of
Charge and Discharge of Batteries
• Bidirectional (MAX4081) or Unidirectional
(MAX4080) ISENSE
• Reference Input for Bidirectional OUT (MAX4081)
●● Minimizes Required Board Space
• 8-Pin μMAX Package
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX4080FAUA+
-40°C to +125°C
8 µMAX
MAX4080FAUA/V+
-40°C to +125°C
8 µMAX
MAX4080FASA+
-40°C to +125°C
8 SO
MAX4080TAUA+
-40°C to +125°C
8 µMAX
MAX4080TAUA/V+
-40°C to +125°C
8 µMAX
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
Ordering Information continued at end of data sheet.
Selector Guide appears at end of data sheet.
Pin Configurations
TOP VIEW
RS+ 1
VCC 2
+
8
RS-
RS+ 1
+
8
RS-
7
N.C.
VCC 2
7
REF1A
3
6
N.C.
N.C.
3
6
REF1B
GND 4
5
OUT
GND 4
5
OUT
N.C.
MAX4080
µMAX/SO
MAX4081
µMAX/SO