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ISL28005 Datasheet

Rail-to-Rail Input Current Sense Amplifier

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DATASHEET
ISL28005
Micropower, Rail-to-Rail Input Current Sense Amplifier with Voltage Output
FN6973
Rev 5.00
October 24, 2013
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”
• See AN1567 for “ISL28005, ISL28006 Unidirectional
Current Sense Amplifiers”
SENSE
+12VDC
SENSE
+5VDC
SENSE
+1.0VDC
MULTIPLE
OUTPUT
POWER SUPPLY
RSENSE
- +5VDC
ISL28005
+
RSENSE
- +5VDC
ISL28005
+
RSENSE
- +5VDC
ISL28005
+
GND
FIGURE 1. TYPICAL APPLICATION
+12VDC
OUTPUT
ISENSE
+12VDC
+5VDC
OUTPUT
ISENSE
+5VDC
+1.0VDC
OUTPUT
ISENSE
+1.0VDC
1.8
VRS+
1.6
1.4
1.2 VTH(L-H) = 1.52V
VTH(H-L) = 1.23V
1.0
0.8
0.6
0.4
0.2
0
0
VOUT (G=100)
G100, VOUT = 1V
G50, VOUT = 500mV
G20, VOUT = 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
FN6973 Rev 5.00
October 24, 2013
Page 1 of 16


Renesas Electronics Components Datasheet

ISL28005 Datasheet

Rail-to-Rail Input Current Sense Amplifier

No Preview Available !

ISL28005
Block Diagram
RS+
RS-
I = 2.86µA
VSENSE
R1
gmHI
VCC
HIGH-SIDE
AND
LOW-SIDE
SENSING
R2
1.35V
VCC
R3
gmLO
+
-
IMIRROR
R5
VSENSE
Rf
Rg
R4
GND
OUT
Pin Configuration
ISL28005
(5 LD SOT-23)
TOP VIEW
GND 1
OUT 2
VCC 3
FIXED
GAIN
5 RS-
4 RS+
Pin Descriptions
ISL28005
(5 ld SOT-23)
1
2
3
4
5
PIN
NAME
DESCRIPTION
GND Power Ground
OUT Amplifier Output
VCC Positive Power Supply
RS+ Sense Voltage Non-inverting Input
RS- Sense Voltage Inverting Input
VCC
RS- CAPACITIVELY
COUPLED
OUT
ESD CLAMP
RS+
GND
FN6973 Rev 5.00
October 24, 2013
Page 2 of 16


Part Number ISL28005
Description Rail-to-Rail Input Current Sense Amplifier
Maker Renesas
Total Page 16 Pages
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