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19-2562; Rev 0; 10/02

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 75碌A(chǔ) of supply current. These

devices are specified over the automotive operating

temperature range (-40擄C to +125擄C) and are available

in a space-saving 8-pin 碌MAX or SO package.

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

鹵0.1% Full-Scale Accuracy

o

Low 100碌V Input Offset Voltage

o

Independent Operating Supply Voltage

o

75碌A(chǔ) Supply Current (MAX4080)

o

Reference Input for Bidirectional OUT (MAX4081)

o

Available in a Space-Saving 8-Pin 碌MAX Package

MAX4080/MAX4081

Ordering Information

PART

MAX4080FAUA

MAX4080FASA

MAX4080TAUA

MAX4080TASA

MAX4080SAUA

MAX4080SASA

MAX4081FAUA

MAX4081FASA

MAX4081TAUA

MAX4081TASA

MAX4081SAUA

MAX4081SASA

TEMP RANGE

-40擄C to +125擄C

-40擄C to +125擄C

-40擄C to +125擄C

-40擄C to +125擄C

-40擄C to +125擄C

-40擄C to +125擄C

-40擄C to +125擄C

-40擄C to +125擄C

-40擄C to +125擄C

-40擄C to +125擄C

-40擄C to +125擄C

-40擄C to +125擄C

PIN-PACKAGE

8 碌MAX

8 SO

8 碌MAX

8 SO

8 碌MAX

8 SO

8 碌MAX

8 SO

8 碌MAX

8 SO

8 碌MAX

8 SO

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

Selector Guide appears at end of data sheet.

Pin Configurations

TOP VIEW

RS+ 1

V

CC

2

N.C.

3

8

7

RS-

N.C.

N.C.

OUT

RS+ 1

V

CC

2

N.C.

3

8

7

RS-

REF1A

REF1B

OUT

MAX4080

6

5

MAX4081

6

5

GND 4

GND 4

碌MAX/SO

碌MAX/SO

________________________________________________________________

Maxim Integrated Products

1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

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