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MAX4080, MAX4081

76V, High-Side, Current-Sense Amplifiers with Voltage Output

Current-Sense Amplifiers Achieve 0.1% Accuracy with Operation Up to 76V

Overview

Technical Documents

Ordering Info

Status

Part Number	Status
MAX4080	Active: In Production. But some versions of the family are Not Recommended for New Designs. See Ordering Information.
MAX4081	Active: In Production.

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 (V_SENSE = 0V). The charging current is represented 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 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.

Data Sheet

Download	Rev 4	(PDF, 332kB)
E-Mail

An evaluation kit is available: MAX4080EVKIT

Key Features

Wide 4.5V to 76V Input Common-Mode Range
Bidirectional or Unidirectional I_SENSE
Low-Cost, Compact, Current-Sense Solution
Three Gain Versions Available
- 5V/V (MAX4080F/MAX4081F)
- 20V/V (MAX4080T/MAX4081T)
- 60V/V (MAX4080S/MAX4081S)
±0.1% Full-Scale Accuracy
Low 100µV Input Offset Voltage
Independent Operating Supply Voltage
75µA Supply Current (MAX4080)
Reference Input for Bidirectional OUT (MAX4081)
Available in a Space-Saving, 8-Pin µMAX Package

Applications/Uses

48V Telecom and Backplane Current Measurement
Automotive (12V, 24V, or 42V Batteries)
Avalanche Photodiode and PIN-Diode Current Monitoring
Bidirectional Motor Control
General System/Board-Level Current Sensing
Power-Management Systems
Precision High-Voltage Current Sources

Key Specifications:

Current Sense Amplifiers

Part Number

CMVR
(V)

V_CC
(V)

I_CC
(µA)

Bi-Dir. Curr. Sense

V_{SENSE_FS}
(mV)

V_OS @25°C
(µV)

Gain

Gain Accuracy @25°C
(%)

BW
(kHz)

Comp-
arators

Oper. Temp.
(°C)

Package/Pins

Budgetary Price

min

max

min

max

typ

recomm.

max

@ -3dB

See Notes

MAX4080

4.5

100

250

1000

600

5 V/V

20 V/V

60 V/V

0.6

250

-40 to +125

µMAX/8

SOIC(N)/8

$1.06 @1k

MAX4081

103

Yes

+/-50

+/-125

+/-500

150

µMAX/8

SOIC(N)/8

$1.21 @1k

See All Current Sense Amplifiers (36)

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Typical Operating Circuit

Application Notes

Tutorial 746		High-Side Current-Sense Measurement: Circuits and Principles
Reference Design 1867		Optocoupler Extends High-Side Current Sensor to 1kV
Application Note 1934		Add High Voltage Capability to the MAX471/MAX472 High-Side Current Sense Amplifiers
Application Note 3906		Creating a Bidirectional Current-Sense Amplifier from Two Unidirectional Current-Sense Amplifiers
Application Note 4078		Extend Current-Sense Amplifier's Input Range Down to 0V
Application Note 4170		Improve Current Measurement Accuracy by Skewing the Input Offset Voltage on Current-Sense Amplifiers
Application Note 4438		Protect Current-Sense Amplifiers Against Overvoltage Transients
Application Note 4517		Extend Range of Current-Sense Amplifiers
Application Note 4837		Protect Current-Sense Amplifiers from Negative Overvoltage

Product Guides

Amplifiers and Comparators (PDF)

Reliability Reports

Reliability Report:	MAX4081.pdf
Show FIT data for:
Request Reliability Report for:

Software/Models

MAX4080F Macromodel

MAX4080F Orcad Library

MAX4080FGBW Test Circuit File

MAX4080FLTR Test Circuit File

MAX4080FSTR Test Circuit File

MAX4080S Macromodel

MAX4080S Orcad Library

MAX4080SGBW Test Circuit File

MAX4080SLTR Test Circuit File

MAX4080SSTR Test Circuit File

MAX4080T Macromodel

MAX4080T Orcad Library

MAX4080TGBW Test Circuit File

MAX4080TLTR Test Circuit File

MAX4080TSTR Test Circuit File

MAX4081F Macromodel

MAX4081F Orcad Library

MAX4081FGBW Test Circuit File

MAX4081FLTR Test Circuit File

MAX4081FSTR Test Circuit File

MAX4081S Macromodel

MAX4081S Orcad Library

MAX4081SGBW Test Circuit File

MAX4081SLTR Test Circuit File

MAX4081SSTR Test Circuit File

MAX4081T Macromodel

MAX4081T Orcad Library

MAX4081TGBW Test Circuit File

MAX4081TLTR Test Circuit File

MAX4081TSTR Test Circuit File

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX4080FASA			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-2*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX4080FASA+			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+2*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4080FASA+T			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+2*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4080FASA-T			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-2*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX4080FAUA			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX4080FAUA+			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4080FAUA+T			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4080FAUA-T			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX4080SASA			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-2*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX4080SASA+			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+2*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
Part Number	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX4080SASA+T			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+2*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4080SASA-T			Active		N.SO;8 pin Land Pattern: Not Available	-40°C to +125°C	See data sheet
MAX4080SAUA			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX4080SAUA+			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4080SAUA+T			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4080SAUA-T			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX4080TASA			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-2*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX4080TASA+			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+2*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4080TASA+T			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+2*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4080TASA-T			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-2*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
Part Number	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX4080TAUA			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX4080TAUA+			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4080TAUA+T			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4080TAUA-T			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX4080TAUA/V+			NRND	MAX9918	µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4080TAUA/V+T			NRND	MAX9918	µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4081FASA			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-2*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX4081FASA+			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+2*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4081FASA+T			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+2*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4081FASA-T			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-2*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
Part Number	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX4081FAUA			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX4081FAUA+			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4081FAUA+T			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4081FAUA-T			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX4081SASA			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-2*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX4081SASA+			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+2*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4081SASA+T			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+2*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4081SASA-T			Active		N.SO;8 pin Land Pattern: Not Available	-40°C to +125°C	See data sheet
MAX4081SAUA			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX4081SAUA+			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
Part Number	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX4081SAUA+T			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4081SAUA-T			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX4081TASA			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-2*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX4081TASA+			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+2*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4081TASA+T			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+2*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4081TASA-T			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-2*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX4081TAUA			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX4081TAUA+			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4081TAUA+T			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4081TAUA-T			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

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Evaluation Kits

MAX4080EVKIT

Evaluation Kit for the MAX4080 and MAX4081

Products with Similar Part Numbers