ISL89411 INTERSIL [Intersil Corporation], ISL89411 Datasheet - Page 44

• Manufacturer Part Number: ISL89411
• Description: Intersil Power Management Solutions
• Manufacturer: INTERSIL [Intersil Corporation]

44
Current Sense Op Amps
Standard High Side/Low Side
Zero-Drift, High Side/Low Side
40V Low Side Only
Integrated Current Sense Amplifier
ISL28005
ISL28006
ISL28130C
Intersil Power Management Solutions  2012  www.intersil.com
ISL28134I
ISL28133
ISL28118
ISL28108
Single
Device
Single
Power Support
Current Sense Amplifiers
Current sense amplifiers (also called current shunt amplifiers) are special purpose amplifiers that output a voltage
proportional to the current flowing in a power rail. They utilize a “sense resistor” to convert the load current in the
power rail to a small voltage, which is then amplified by the current sense amplifier. The current in the power rail
can be in the range of 1A to 20A, as a result, the sense resistor is a very low ohmic value (usually in the mΩ range in
some cases PCB traces are used as sense resistors). These amplifiers are designed to amplify a very small “sense
voltage”— on the order of 10mV to 100mV in the presence of very large common-mode voltages. DC precision (low
input offset voltage) and high common-mode rejection ratio (CMRR) are distinguishing characteristics of these
amplifiers. Current sense amplifiers can either measure current flowing in a single direction (uni-directional) or both
directions (bi-directional) through a sense resistor.
5V Ultra Low Noise,
Zero-Drift
Rail-to-Rail
Precision Op Amp
• Rail-to-Rail Inputs and Outputs
• Low Offset Voltage................. 2.5µV, Max
• Superb Offset Drift ............15nV/°C, Max
• Low I
• Wide Bandwidth...........................3.5MHz
ISL28230C ISL28430C
Key Features
ISL28233
ISL28218
ISL28208
Device
Dual
Min
○ CMRR @ V
Voltage (V)
2.7
2.7
Supply
Typ
CC
ISL28433
ISL28408
Max
28
28
Quad
...................................675µA, Typ
Mode Range (V)
Input Common
Min
CM
0
0
2.25
Min Max
1.8
1.8
Voltage
Supply
3
3
= 0.1V beyond V
(V)
Max
5.5
5.5
28
40
40
28
6
Ground
Ground
Rail-To-Rail
Vos Max @
Yes
Yes
Yes
In
25°C
µV
500
250
Out
Yes
Yes
Yes
Yes
Yes
S
...135dB,
Vos Max
Max @
0.0025
25°C
0.006
Vos
0.04
0.15
0.23
Temp
mV
500
300
µV
TCVos
µV/°C
0.0005
0.02
0.05
Typ
CMRR Min
0.2
0.1
Temp
105
105
dB
Ib Max
25°C
0.25
0.18
575
nA
0.3
43
@
Typical Current Sense Application Circuit
20, 50, 100, Adj
RESISTOR
Gain Range
20, 50, 100
SENSE
(20-100)
CMRR
min @
25°C
120
103
105
V/V
dB
110
118
I-SENSE+
I-SENSE-
Is Max
25°C
0.025
0.900
0.025
0.25
mA
1.1
@
Accuracy
@ 25°C
Gain
0.7
%
2
GBW
MHz
0.4
3.5
0.4
1.2
4
Slew
Rate
V/µs
0.45
Accuracy
0.2
1.5
0.2
1.2
Temp
Gain
%
3
1
Noise @
Voltage
S = Single Op Amp
1kHz
√Hz
15.8
nV/
5.6
65
10
65
3
4
Is Max @
ISL28134
+
-
25°C
µA
59
62
V+
V-
-40 to 125
-40 to 125
-40 to 125
-40 to 85
Range
5
2
0 to 70
Temp
°C
1
GBW
kHz
180
180
D = Dual Op Amp
Zero-Drift: ISL28134
S
S
1.8V TO +5.5V
S
S
Temp Range
-40 to 125
-40 to 125
S/D
S/D S/D/Q
°C
D
D
GND
V
V
Package
S
REF
V
SENSE
OUT
S/D/Q
D/Q
S/D
S
Q = Quad Op Amp
5 Ld SOT23
5 Ld SOT23
Package
Q
Q
S/D/Q
S/D
S/D