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

Voltage Output

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11

Table 1. Typical Component Values

FULL-SCALE LOAD

CURRENT-SENSE

RESISTOR (m

Ω)

GAIN

(V/V)

FULL-SCALE

(mV)

MAX4081 FULL-SCALE

OUTPUT VOLTAGE

0.500

1000

5

±500

±2.5

0.125

1000

20

±125

±2.5

0.050

1000

60

±50

±3.0

5.000

100

5

±500

±2.5

1.250

100

20

±125

±2.5

0.500

100

60

±50

±3.0

50.000

10

5

±500

±2.5

12.500

10

20

±125

±2.5

5.000

10

60

±50

±3.0

FULL-SCALE LOAD

CURRENT-SENSE

RESISTOR (m

Ω)

GAIN

(V/V)

FULL-SCALE

(mV)

MAX4080 FULL-SCALE

OUTPUT VOLTAGE (V)

1.000

1000

5

1000

5.0

0.250

1000

20

250

5.0

0.100

1000

60

100

6.0

10.000

100

5

1000

5.0

2.500

100

20

250

5.0

1.000

100

60

100

6.0

50.000

10

5

500

2.5

25.000

10

20

250

5.0

10.000

10

60

100

6.0

External References (MAX4081)

REF1A and REF1B to a low-noise, regulated voltage

source to set the output reference level. In this mode,

Figure 4).

Alternatively, connect REF1B to ground, and REF1A to a

low-noise, regulated voltage source. In this case, the out-

In either mode, the output swings above the reference

output swings below the reference voltage for negative

Applications Information

Recommended Component Values

Ideally, the maximum load current develops the full-

scale sense voltage across the current-sense resistor.

Choose the gain needed to yield the maximum output

voltage required for the application:

for gain of 5V/V, 250mV for gain of 20V/V, 100mV for

In applications monitoring a high current, ensure that

tor’s power dissipation is exceeded, its value may drift

or it may fail altogether.

The MAX4080/MAX4081 sense a wide variety of cur-

rents with different sense-resistor values. Table 1 lists

common resistor values for typical operation.