ISL28005_11 Datasheet, PDF (1/14 Pages) Intersil Corporation – Micropower, Rail-to-Rail Input Current Sense Amplifier

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”
SENSE
+12VDC
SENSE
+5VDC
SENSE
+1.0VDC
MULTIPLE
OUTPUT
POWER SUPPLY
R_SENSE
-
+5VDC
ISL28005
+
R_SENSE
-
+5VDC
ISL28005
+
R_SENSE
-
+5VDC
ISL28005
+
GND
FIGURE 1. TYPICAL APPLICATION
+12VDC
OUTPUT
I_SENSE
+12VDC
+5VDC
OUTPUT
I_SENSE
+5VDC
+1.0VDC
OUTPUT
I_SENSE
+1.0VDC
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)
FIGURE 2. HIGH-SIDE AND LOW-SIDE THRESHOLD VOLTAGE
July 1, 2011
1
FN6973.4
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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