DATASHEET
ISL28005
Micropower, Rail-to-Rail Input Current Sense Amplifier with Voltage Output
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.
FN6973
Rev 5.00
October 24, 2013
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
R
SENSE
+12VDC
OUTPUT
+5VDC
-
ISL28005
+
I
SENSE
+12VDC
+5VDC
OUTPUT
-
+5VDC
I
SENSE
+5VDC
+1.0VDC
OUTPUT
I
SENSE
+1.0VDC
ISL28005
+
SENSE
+1.0VDC
MULTIPLE
OUTPUT
POWER SUPPLY
GND
R
SENSE
1.8
1.6
1.4
1.2
VOLTS (V)
1.0
0.8
0.6
0.4
0.2
0
0
0.2
0.4
0.6
0.8 1.0 1.2
TIME (ms)
1.4
1.6
1.8
2.0
V
RS+
SENSE
+5VDC
R
SENSE
V
TH(L-H)
= 1.52V
V
TH(H-L)
= 1.23V
V
OUT
(G=100)
G100, V
OUT
= 1V
G50, V
OUT
= 500mV
G20, V
OUT
= 200mV
+5VDC
-
ISL28005
+
FIGURE 1. TYPICAL APPLICATION
FIGURE 2. HIGH-SIDE AND LOW-SIDE THRESHOLD VOLTAGE
FN6973 Rev 5.00
October 24, 2013
Page 1 of 16
ISL28005
Block Diagram
V
CC
I = 2.86µA
V
SENSE
R
S+
R
1
gm
HI
HIGH-SIDE
AND
LOW-SIDE
SENSING
R
S-
R
2
+
1.35V
-
OUT
R
f
V
CC
I
MIRROR
R
3
gm
LO
V
SENSE
R
5
R
g
R
4
GND
Pin Configuration
ISL28005
(5 LD SOT-23)
TOP VIEW
GND 1
OUT 2
V
CC
3
FIXED
GAIN
4 RS+
5 RS-
Pin Descriptions
ISL28005
(5 ld SOT-23)
1
2
3
4
5
PIN
NAME
GND
OUT
V
CC
RS+
RS-
DESCRIPTION
Power Ground
Amplifier Output
Positive Power Supply
Sense Voltage Non-inverting Input
Sense Voltage Inverting Input
V
CC
RS-
CAPACITIVELY
COUPLED
ESD CLAMP
OUT
RS+
GND
FN6973 Rev 5.00
October 24, 2013
Page 2 of 16
ISL28005
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
ISL28005FH100Z-T7
ISL28005FH100Z-T7A
ISL28005FH50Z-T7
ISL28005FH50Z-T7A
ISL28005FH20Z-T7
ISL28005FH20Z-T7A
ISL28005FH-100EVAL1Z
ISL28005FH-50EVAL1Z
ISL28005FH-20EVAL1Z
NOTES:
1. Please refer to
TB347
for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil
Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information page for
ISL28005.
For more information on MSL please see techbrief
TB363.
4. The part marking is located on the bottom of the part.
100V/V
100V/V
50V/V
50V/V
20V/V
20V/V
GAIN
PART MARKING
BDEA (Note 4)
BDEA (Note 4)
BDDA (Note 4)
BDDA (Note 4)
BDCA (Note 4)
BDCA (Note 4)
PACKAGE
Tape & Reel
(Pb-Free)
5 Ld SOT-23
5 Ld SOT-23
5 Ld SOT-23
5 Ld SOT-23
5 Ld SOT-23
5 Ld SOT-23
PKG.
DWG. #
P5.064A
P5.064A
P5.064A
P5.064A
P5.064A
P5.064A
100V/V Evaluation Board
50V/V Evaluation Board
20V/V Evaluation Board
FN6973 Rev 5.00
October 24, 2013
Page 3 of 16
ISL28005
Absolute Maximum Ratings
Max Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..28V
Max Differential Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20mA
Max Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±0.5V
Max Input Voltage (RS+, RS-) . . . . . . . . . . . . . . . . . . . . . . . GND-0.5V to 30V
Max Input Current for Input Voltage <GND -0.5V . . . . . . . . . . . . . . . ±20mA
Output Short-Circuit Duration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indefinite
ESD Rating
Human Body Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4kV
Machine Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .200V
Charged Device Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5kV
Thermal Information
Thermal Resistance (Typical)
JA
(°C/W)
JC
(°C/W)
5 Ld SOT-23 (Notes 5, 6) . . . . . . . . . . . . . . .
190
90
Maximum Storage Temperature Range . . . . . . . . . . . . . .-65°C to +150°C
Maximum Junction Temperature (T
JMAX
) . . . . . . . . . . . . . . . . . . . . .+150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Recommended Operating Conditions
Ambient Temperature Range (T
A
) . . . . . . . . . . . . . . . . . . .-40°C to +125°C
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
5.
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief
TB379
for details.
6. For
JC
, the “case temp” location is taken at the package top center.
Electrical Specification
V
CC
= 12V, V
RS+
= 0V to 28V, V
SENSE
= 0V, R
LOAD
= 1MΩ, T
A
= +25°C unless otherwise specified. Boldface limits
apply over the operating temperature range, -40°C to +125°C. Temperature data established by characterization.
PARAMETER
V
OS
DESCRIPTION
Input Offset Voltage
(Notes 8, 9)
CONDITIONS
V
CC
= V
RS
+ = 12V,
V
S
= 20mV to = 100mV
V
CC
= 12V, V
RS
+ = 0.2V, V
S
= 20mV,
V
S
= 100mV
I
RS
+, I
RS
-
I
RS
+
Leakage Current
Gain = 100 + Input Bias Current
V
CC
= 0V, V
RS+
= 28V
V
RS
+ = 2V,
VSENSE
= 5mV
V
RS
+ = 0V,
VSENS
E
= 5mV
Gain = 50, Gain = 20 +Input Bias Current
V
RS
+ = 2V,
V
SENSE
= 5mV
V
RS
+ = 0V,
V
SENSE
= 5mV
I
RS
-
Input Bias Current
V
RS
+ = 2V,
VSENSE
= 5mV
V
RS
+ = 0V,
VSENSE
= 5mV
CMRR
PSRR
VF
S
G
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Full-scale Sense Voltage
Gain
(Note 8)
V
RS
+ = 2V to 28V
V
CC
= 2.7V to 28V, V
RS
+ = 2V
V
CC
= 28V, V
RS
+ = 0.2V, 12V
ISL28005-100
ISL28005-50
ISL28005-20
-125
-130
105
90
200
100
50
20
-700
-840
-500
-600
MIN
(Note 7)
-500
-500
-3
-3.3
TYP
60
-1.2
0.041
4.7
-425
4.7
-432
5
-45
115
105
50
75
6
8
MAX
(Note 7)
500
500
3
3.3
1.2
1.5
6
7
UNIT
µV
mV
µA
µA
nA
µA
nA
nA
nA
dB
dB
mV
V/V
V/V
V/V
FN6973 Rev 5.00
October 24, 2013
Page 4 of 16
ISL28005
V
CC
= 12V, V
RS+
= 0V to 28V, V
SENSE
= 0V, R
LOAD
= 1MΩ, T
A
= +25°C unless otherwise specified. Boldface limits
apply over the operating temperature range, -40°C to +125°C. Temperature data established by characterization. (Continued)
PARAMETER
G
A
DESCRIPTION
Gain = 100 Gain Accuracy
(Note 10)
CONDITIONS
V
CC
= V
RS
+ = 12V, V
SENSE
= 20mV to
100mV
V
CC
= 12V, V
RS
+ = 0.1V,
V
SENSE
= 20mV to 100mV
Gain = 50, Gain = 20 Gain Accuracy
(Note 10)
V
CC
= V
RS
+ = 12V, V
SENSE
= 20mV to
100mV
V
CC
= 12V, V
RS
+ = 0.1V,
V
SENSE
= 20mV to 100mV
V
OA
Gain = 100 Total Output Accuracy
(Note 11)
V
CC
= V
RS
+ = 12V,
V
SENSE
= 100mV
V
CC
= 12V, V
RS
+ = 0.1V,
V
SENSE
= 100mV
Gain = 50, Gain = 20 Total Output
Accuracy (Note 11)
V
CC
= V
RS
+ = 12V,
V
SENSE
= 100mV
V
CC
= 12V, V
RS
+ = 0.1V,
V
SENSE
= 100mV
V
OH
Output Voltage Swing, High
V
CC
- V
OUT
Output Voltage Swing, Low
V
OUT
Output Resistance
Short Circuit Sourcing Current
Short Circuit Sinking Current
Gain = 100
Supply Current
Gain = 50, 20
Supply Current
V
CC
SR
Supply Voltage
Gain = 100 Slew Rate
I
O
= -500µA, V
CC
= 2.7V
V
SENSE
= 100mV
V
RS
+ = 2V
I
O
= 500µA, V
CC
= 2.7V
V
SENSE
= 0V, V
RS
+ = 2V
V
CC
= V
RS
+ = 12V, V
SENSE
= 100mV
I
OUT
= 10µA to 1mA
V
CC
= V
RS
+ = 5V, R
L
= 10Ω
V
CC
= V
RS
+ = 5V, R
L
= 10Ω
V
RS
+ > 2V, V
SENSE
= 5mV
V
RS
+ > 2V, V
SENSE
= 5mV
Guaranteed by PSRR
Pulse on RS+ pin,
V
OUT
= 8V
P-P
(see Figure 25)
Pulse on RS+ pin,
V
OUT
= 8V
P-P
(see Figure 25)
Pulse on RS+ pin,
V
OUT
= 3.5V
P-P
(see Figure 25)
V
RS
+ = 12V, 0.1V, V
SENSE
= 100mV
V
RS
+ = 12V, 0.1V, V
SENSE
= 100mV
V
RS
+ = 12V, 0.1V, V
SENSE
= 100mV
2.7
0.58
0.76
-2.5
-2.7
-6
-7
-1.41
39
-2
-3
-3
-4
-2.5
-2.7
-1.25
2.5
2.7
6
7
50
-0.31
MIN
(Note 7)
-2
-3
-0.25
2
3
3
4
2.5
2.7
TYP
MAX
(Note 7)
2
3
UNIT
%
%
%
%
%
%
%
%
mV
Electrical Specification
V
OL
R
OUT
I
SC+
I
SC-
I
CC
30
6.5
4.8
8.7
50
50
50
mV
mA
mA
59
62
62
63
28
µA
µA
V
V/µs
Gain = 50 Slew Rate
0.58
0.67
V/µs
Gain = 20 Slew Rate
0.50
0.67
V/µs
BW
-3dB
Gain = 100
-3dB Bandwidth
Gain = 50
-3dB Bandwidth
Gain = 20
-3dB Bandwidth
110
160
180
kHz
kHz
kHz
FN6973 Rev 5.00
October 24, 2013
Page 5 of 16
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