1

Micropower, Rail-to-Rail Input Current Sense Amplifier

with Voltage Output

ISL28005

The ISL28005 is a micropower, uni-directional high-side and low-

side current sense amplifier featuring a proprietary rail-to-rail

input current sensing amplifier. The ISL28005 is ideal for high-

side current sense applications where the sense voltage is

usually much higher than the amplifier supply voltage. The

device can be used to sense voltages as high as 28V when

operating from a supply voltage as low as 2.7V. The micropower

ISL28005 consumes only 50µA of supply current when operating

from a 2.7V to 28V supply.

The ISL28005 features a common-mode input voltage range

from 0V to 28V. The proprietary architecture extends the input

voltage sensing range down to 0V, making it an excellent choice

for low-side ground sensing applications. The benefit of this

architecture is that a high degree of total output accuracy is

maintained over the entire 0V to 28V common mode input

voltage range.

The ISL28005 is available in fixed (100V/V, 50V/V and 20V/V)

gains in the space saving 5 Ld SOT-23 package. The parts

operate over the extended temperature range from -40°C to

+125°C.

Features

• Low Power Consumption. . . . . . . . . . . . . . . . . . . . . . 50µA,Typ

• Supply Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.7V to 28V

• Wide Common Mode Input. . . . . . . . . . . . . . . . . . . . 0V to 28V

• Fixed Gain Versions

- ISL28005-100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100V/V

- ISL28005-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50V/V

- ISL28005-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V/V

• Operating Temperature Range. . . . . . . . . . .-40°C to +125°C

• Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Ld SOT-23

Applications

• Power Management/Monitors

• Power Distribution and Safety

• DC/DC, AC/DC Converters

• Battery Management /Charging

• Automotive Power Distribution

Related Literature

• See AN1531 for “ISL28005 Evaluation Board User’s Guide”

ISL28005

GND

ISL28005

ISL28005

+5VDC

+12VDC

+

-

+1.0VDC

+1.0VDC

SENSE

SENSE

SENSE

OUTPUT

+5VDC

OUTPUT

+12VDC

OUTPUT

MULTIPLE

OUTPUT

POWER SUPPLY

+12VDC

+5VDC

+1.0VDC

+

-

+

-

+5VDC

+5VDC

+5VDC

FIGURE 1. TYPICAL APPLICATION

0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

TIME (ms)

FIGURE 2. HIGH-SIDE AND LOW-SIDE THRESHOLD VOLTAGE

July 1, 2011

FN6973.4

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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