MAX4080_11 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – 76V, High-Side, Current-Sense Amplifiers with Voltage Output

19-2562; Rev 4; 7/11
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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 cur-
rent 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 (V_SENSE = 0V). The charging current is rep-
resented by an output voltage from V_REF to V_CC, while
discharge current is given from V_REF to GND.
For maximum versatility, the 76V input voltage range
applies independently to both supply voltage (V_CC)
and common-mode input voltage (V_RS+). 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 sin-
gle 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.
Features
o Wide 4.5V to 76V Input Common-Mode Range
o Bidirectional or Unidirectional I_SENSE
o Low-Cost, Compact, Current-Sense Solution
o Three Gain Versions Available
5V/V (MAX4080F/MAX4081F)
20V/V (MAX4080T/MAX4081T)
60V/V (MAX4080S/MAX4081S)
o ±0.1% Full-Scale Accuracy
o Low 100µV Input Offset Voltage
o Independent Operating Supply Voltage
o 75µA Supply Current (MAX4080)
o Reference Input for Bidirectional OUT (MAX4081)
o Available in a Space-Saving, 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
MAX4080TASA+
-40°C to +125°C 8 SO
MAX4080SAUA+
-40°C to +125°C 8 µMAX
MAX4080SAUA/V+ -40°C to +125°C 8 µMAX
MAX4080SASA+
-40°C to +125°C 8 SO
Ordering Information continued at end of data sheet.
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
Selector Guide appears at end of data sheet.
Pin Configurations
TOP VIEW
+
RS+ 1
V_CC 2
N.C. 3
MAX4080
GND 4
+
8 RS- RS+ 1
7 N.C. V_CC 2
6 N.C. N.C. 3
MAX4081
5 OUT GND 4
8 RS-
7 REF1A
6 REF1B
5 OUT
µMAX/SO
µMAX/SO
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.