ISL28005_10 Datasheet, PDF (1/14 Pages) Intersil Corporation – Micropower, Rail-to-Rail Input Current Sense Amplifier with Voltage Output

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*(see page 13)
• Power Management/Monitors
• Power Distribution and Safety
• DC/DC, AC/DC Converters
• Battery Management /Charging
• Automotive Power Distribution
Related Literature*(see page 13)
• See AN1531 for “ISL28005 Evaluation Board User’s
Guide”
Typical Application
SENSE
+12VDC
SENSE
+5VDC
SENSE
+1.0VDC
MULTIPLE
OUTPUT
POWER SUPPLY
GND
R_SENSE
-
+5VDC
ISL28005
+
R_SENSE
-
+5VDC
ISL28005
+
R_SENSE
-
+5VDC
ISL28005
+
+12VDC
OUTPUT
I_SENSE
+12VDC
+5VDC
OUTPUT
I_SENSE
+5VDC
+1.0VDC
OUTPUT
I_SENSE
+1.0VDC
High-Side And Low-Side
Threshold Voltage
1.8
V_RS+
1.6
1.4
V_TH(L-H) = 1.52V
1.2
V_TH(H-L) = 1.23V
1.0
0.8
0.6
0.4
0.2
0
0
V_OUT (G=100)
G100, V_OUT = 1V
G50, V_OUT = 500mV
G20, V_OUT = 200mV
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
TIME (ms)
September 16, 2010
FN6973.3
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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