Micropower, Rail-to-Rail Input Current Sense
Amplifier with Voltage Output
ISL28005
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
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.
• Operating Temperature Range . . -40°C to +125°C
• Package . . . . . . . . . . . . . . . . . . . . .5 Ld SOT-23
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.
Applications*(see page 13)
• Power Management/Monitors
• Power Distribution and Safety
• DC/DC, AC/DC Converters
• Battery Management /Charging
• Automotive Power Distribution
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.
Related Literature*(see page 13)
• See AN1531 for “ISL28005 Evaluation Board User’s
Guide”
Typical Application
High-Side And Low-Side
Threshold Voltage
SENSE
+12VDC
OUTPUT
+12VDC
1.8
R
V
SENSE
RS+
+5VDC
-
1.6
1.4
I
SENSE
ISL28005
+12VDC
+
V
V
= 1.52V
TH(L-H)
SENSE
+5VDC
1.2
1.0
0.8
0.6
0.4
0.2
0
+5VDC
OUTPUT
V
= 1.23V
TH(H-L)
R
SENSE
SENSE
-
+5VDC
I
(G=100)
SENSE
ISL28005
OUT
+5VDC
+
SENSE
G100, V
= 1V
OUT
+1.0VDC
OUTPUT
+1.0VDC
G50, V
G20, V
= 500mV
= 200mV
OUT
OUT
R
+5VDC
-
MULTIPLE
I
SENSE
+1.0VDC
ISL28005
OUTPUT
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
TIME (ms)
POWER SUPPLY
+
GND
September 16, 2010
FN6973.3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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