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MAX4080SASAN/a60avai76V / High-Side / Current-Sense Amplifiers with Voltage Output
MAX4080SASAMAXIN/a40avai76V / High-Side / Current-Sense Amplifiers with Voltage Output
MAX4080TASAMAXIMN/a100avai76V / High-Side / Current-Sense Amplifiers with Voltage Output
MAX4080TAUAMAXIMN/a663avai76V / High-Side / Current-Sense Amplifiers with Voltage Output
MAX4081FAUAMAXIMN/a21avai76V / High-Side / Current-Sense Amplifiers with Voltage Output
MAX4081SASAMAXIMN/a100avai76V / High-Side / Current-Sense Amplifiers with Voltage Output
MAX4081TAUAMAXN/a1avai76V / High-Side / Current-Sense Amplifiers with Voltage Output


MAX4080TAUA ,76V / High-Side / Current-Sense Amplifiers with Voltage OutputApplicationsMAX4081SASA -40°C to +125°C 8 SOAutomotive (12V, 24V, or 42V Batteries)Selector Guide a ..
MAX4080TAUA+ ,76V, High-Side, Current-Sense Amplifiers with Voltage OutputApplicationsamplifiers with an input voltage range that extends from • Wide 4.5V to 76V Input Commo ..
MAX4080TAUA+T ,76V, High-Side, Current-Sense Amplifiers with Voltage OutputApplicationsamplifiers with an input voltage range that extends from • Wide 4.5V to 76V Input Commo ..
MAX4081FASA+ ,76V, High-Side, Current-Sense Amplifiers with Voltage OutputElectrical Characteristics(V = V = 4.5V to 76V, V = V = 5V (MAX4081 only), V = (V - V ) = 0V, R = 1 ..
MAX4081FAUA ,76V / High-Side / Current-Sense Amplifiers with Voltage OutputMAX4080/MAX408119-2562; Rev 0; 10/0276V, High-Side, Current-Sense Amplifiers withVoltage Output
MAX4081SASA ,76V / High-Side / Current-Sense Amplifiers with Voltage OutputFeaturesThe MAX4080/MAX4081 are high-side, current-sense Wide 4.5V to 76V Input Common-Mode Rangea ..
MAX774CSA ,-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-DC ControllersFeaturesThe MAX774/MAX775/MAX776 inverting switching ' 85% Efficiency for 5mA to 1A Load Currentsre ..
MAX774CSA ,-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-DC ControllersMAX774/MAX775/MAX77619-0191; Rev 1; 3/94-5V/-12V/-15V or Adjustable, High-Efficiency, Low I Inverti ..
MAX774CSA+ ,-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-to-DC ControllersMAX774/MAX775/MAX77619-0191; Rev 2; 12/02-5V/-12V/-15V or Adjustable, High-Efficiency, Low I Invert ..
MAX774EPA ,-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-DC ControllersMAX774/MAX775/MAX77619-0191; Rev 1; 3/94-5V/-12V/-15V or Adjustable, High-Efficiency, Low I Inverti ..
MAX774ESA ,-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-DC ControllersFeaturesThe MAX774/MAX775/MAX776 inverting switching ' 85% Efficiency for 5mA to 1A Load Currentsre ..
MAX774ESA+ ,-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-to-DC ControllersApplicationsOrdering Information continued on last page.Data CommunicatorsTypical Operating Circuit ..


MAX4080SASA-MAX4080TASA-MAX4080TAUA-MAX4081FAUA-MAX4081SASA-MAX4081TAUA
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 (VSENSE= 0V). The charging current is rep-
resented by an output voltage from VREFto VCC, while
discharge current is given from VREFto 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 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
Features
Wide 4.5V to 76V Input Common-Mode RangeBidirectional or Unidirectional ISENSELow-Cost, Compact, Current-Sense SolutionThree Gain Versions Available
5V/V (MAX4080F/MAX4081F)
20V/V (MAX4080T/MAX4081T)
60V/V (MAX4080S/MAX4081S)
±0.1% Full-Scale AccuracyLow 100µV Input Offset VoltageIndependent Operating Supply Voltage75µA Supply Current (MAX4080)Reference Input for Bidirectional OUT (MAX4081)Available in a Space-Saving 8-Pin µMAX Package
MAX4080/MAX4081
76V, High-Side, Current-Sense Amplifiers with
Voltage Output
Pin Configurations
Ordering Information

19-2562; Rev 0; 10/02
Selector Guide appears at end of data sheet.
MAX4080/MAX4081
76V, High-Side, Current-Sense Amplifiers with
Voltage Output
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.
VCCto GND............................................................-0.3V to +80V
RS+, RS- to GND....................................................-0.3V to +80V
OUT to GND.............-0.3V to the lesser of +18V or (VCC+ 0.3V)
REF1A, REF1B to GND
(MAX4081 Only)....-0.3V to the lesser of +18V or (VCC+ 0.3V)
Output Short Circuit to GND.......................................Continuous
Differential Input Voltage (VRS+ - VRS-)...............................±80V
Current into Any Pin..........................................................±20mA
Continuous Power Dissipation (TA= +70°C)
8-Pin µMAX (derate 4.5mW/°C above +70°C).............362mW
8-Pin SO (derate 5.88mW/°C above +70°C)................471mW
Operating Temperature Range.........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
DC ELECTRICAL CHARACTERISTICS

(VCC= VRS+= 4.5V to 76V, VREF1A= VREF1B= 5V (MAX4081 only), VSENSE= (VRS+- VRS-) = 0V, RLOAD= 100kΩ, TA= TMINto
MAX4080/MAX4081
76V, High-Side, Current-Sense Amplifiers with
Voltage Output
DC ELECTRICAL CHARACTERISTICS (continued)

(VCC= VRS+= 4.5V to 76V, VREF1A= VREF1B= 5V (MAX4081 only), VSENSE= (VRS+- VRS-) = 0V, RLOAD= 100kΩ, TA= TMINto
MAX4080/MAX4081
76V, High-Side, Current-Sense Amplifiers with
Voltage Output
AC ELECTRICAL CHARACTERISTICS

(VCC= VRS+= 4.5V to 76V, VREF1A= VREF1B= 5V (MAX4081 only), VSENSE= (VRS+- VRS-) = 0V, RLOAD= 100kΩ, CLOAD= 20pF,
Note 2:
VREFis defined as the average voltage of VREF1Aand VREF1B. REF1B is usually connected to REF1A or GND.
VSENSEis defined as VRS+- VRS-.
Note 3:
The common-mode range at the low end of 4.5V applies to the most positive potential at RS+ or RS-. Depending on the
polarity of VSENSEand the device’s gain, either RS+ or RS- can extend below 4.5V by the device’s typical full-scale value of
VSENSE.
Note 4:
Negative VSENSEapplies to MAX4081 only.
Note 5:
VSENSEis:
MAX4080F, 10mV to 1000mV
MAX4080T, 10mV to 250mV
MAX4080S, 10mV to 100mV
MAX4081F, -500mV to +500mV
MAX4081T, -125mV to +125mV
MAX4081S, -50mV to +50mV
Note 6:
VOSis extrapolated from the gain accuracy test for the MAX4080 and measured as (VOUT- VREF)/AVat VSENSE= 0V, for the
MAX4081.
Note 7:
VSENSEis:
MAX4080F, 500mV
MAX4080T, 125mV
MAX4080S, 50mV
MAX4081F/T/S, 0V
VREF1B= VREF1A= 2.5V
Note 8:
Output voltage is internally clamped not to exceed 18V.
Note 9:
Output settles to within 1% of final value.
Note 10:The device will not experience phase reversal when overdriven.
MAX4080/MAX4081
76V, High-Side, Current-Sense Amplifiers with
Voltage Output

INPUT OFFSET VOLTAGE HISTOGRAM
MAX4080 toc01
INPUT OFFSET VOLTAGE (µV)
PERCENTAGE (%)
INPUT OFFSET VOLTAGE
vs. TEMPERATURE

MAX4080 toc02
INPUT OFFSET VOLTAGE (
TEMPERATURE (°C)
GAIN ACCURACY vs. TEMPERATURE
MAX4080 toc03
TEMPERATURE (°C)
GAIN ACCURACY (%)
GAIN ACCURACY vs. VCC

MAX4080 toc04
VCC (V)
GAIN ACCURACY (%)52402816
MAX4080 toc05
FREQUENCY (Hz)
COMMON-MODE REJECTION RATIO (dB)
100k10k1k10010
11M
MAX4081F/T/S
COMMON-MODE REJECTION RATIO
vs. FREQUENCY

MAX4080 toc06
FREQUENCY (Hz)
POWER-SUPPLY REJECTION RATIO (dB)
100k10k1k10010
11M
MAX4081F/T/S
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY

MAX4080 toc07
FREQUENCY (Hz)
REFERENCE REJECTION RATIO (dB)
MAX4081F/T/S
REFERENCE REJECTION RATIO
vs. FREQUENCY
10k1k100101100k
MAX4080 toc08
FREQUENCY (kHz)
GAIN (dB)
MAX4080F/T/S
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4080 toc09
FREQUENCY (kHz)
GAIN (dB)
MAX4081F/T/S
SMALL-SIGNAL GAIN vs. FREQUENCY
Typical Operating Characteristics
(VCC= VRS+= 48V, VSENSE= 0V, CLOAD= 20pF, RLOAD= ∞, TA= +25°C, unless otherwise noted.)
MAX4080/MAX4081
76V, High-Side, Current-Sense Amplifiers with
Voltage Output
Typical Operating Characteristics (continued)

(VCC= VRS+= 48V, VSENSE= 0V, CLOAD= 20pF, RLOAD= ∞, TA= +25°C, unless otherwise noted.)
MAX4080/MAX4081
76V, High-Side, Current-Sense Amplifiers with
Voltage Output

MAX4080 toc19
INPUT
10mV/div
OUTPUT
50mV/div
20µs/div
MAX4081F
SMALL-SIGNAL TRANSIENT RESPONSE

MAX4080 toc20
INPUT
2.5mV/div
OUTPUT
50mV/div
20µs/div
MAX4081T
SMALL-SIGNAL TRANSIENT RESPONSE

MAX4080 toc21
INPUT
1mV/div
OUTPUT
50mV/div
20µs/div
MAX4081S
SMALL-SIGNAL TRANSIENT RESPONSE

MAX4080 toc22
INPUT
400mV/div
OUTPUT
2V/div
20µs/div
MAX4080F
LARGE-SIGNAL TRANSIENT RESPONSE

MAX4080 toc23
INPUT
100mV/div
OUTPUT
2V/div
20µs/div
MAX4080T
LARGE-SIGNAL TRANSIENT RESPONSE

MAX4080 toc24
INPUT
33mV/div
OUTPUT
2V/div
20µs/div
MAX4080S
LARGE-SIGNAL TRANSIENT RESPONSE

MAX4080 toc25
INPUT
400mV/div
OUTPUT
2V/div
20µs/div
MAX4081F
LARGE-SIGNAL TRANSIENT RESPONSE

MAX4080 toc26
INPUT
100mV/div
OUTPUT
2V/div
20µs/div
MAX4081T
LARGE-SIGNAL TRANSIENT RESPONSE

MAX4080 toc27
INPUT
33mV/div
OUTPUT
2V/div
20µs/div
MAX4081S
LARGE-SIGNAL TRANSIENT RESPONSEypical Operating Characteristics (continued)

(VCC= VRS+= 48V, VSENSE= 0V, CLOAD= 20pF, RLOAD= ∞, TA= +25°C, unless otherwise noted.)
MAX4080/MAX4081
76V, High-Side, Current-Sense Amplifiers with
Voltage Output
Typical Operating Characteristics (continued)

(VCC= VRS+= 48V, VSENSE= 0V, CLOAD= 20pF, RLOAD= ∞, TA= +25°C, unless otherwise noted.)
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