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

For maximum versatility, the 76V input voltage range

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

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 Range

♦ 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

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

Voltage Output

________________________________________________________________

Maxim Integrated Products

1

N.C.

OUT

GND

1

2

8

7

RS-

N.C.

N.C.

RS+

μMAX/SO

TOP VIEW

3

4

6

5

MAX4080

REF1B

OUT

GND

1

2

8

7

RS-

REF1A

N.C.

RS+

μMAX/SO

3

4

6

5

MAX4081

Pin Configurations

Ordering Information

19-2562; Rev 1; 11/08

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.

EVALUATION

KIT

AVAILABLE

PART

TEMP RANGE

PIN-PACKAGE

MAX4080FAUA

-40

°C to +125°C

8 µMAX

MAX4080FASA

-40

°C to +125°C

8 SO

MAX4080TAUA

-40

°C to +125°C

8 µMAX

MAX4080TASA

-40

°C to +125°C

8 SO

MAX4080SAUA

-40

°C to +125°C

8 µMAX

MAX4080SASA

-40

°C to +125°C

8 SO

MAX4081FAUA

-40

°C to +125°C

8 µMAX

MAX4081FASA

-40

°C to +125°C

8 SO

MAX4081TAUA

-40

°C to +125°C

8 µMAX

MAX4081TASA

-40

°C to +125°C

8 SO

MAX4081SAUA

-40

°C to +125°C

8 µMAX

MAX4081SASA

-40

°C to +125°C

8 SO

Selector Guide appears at end of data sheet.

µMAX is a registered trademark of Maxim Integrated Products, Inc.