1CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2010, 2011. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
Micropower, Rail to Rail Input Current Sense Amplifier with
Voltage Output
ISL28006
The ISL28006 is a micropower, uni-directional high-side and
low-side current sense amplifier featuring a proprietary
rail-to-rail input current sensing amplifier. The ISL28006 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 ISL28006 consumes only 50µA of supply current
when operating from a 2.7V to 28V supply.
The ISL28006 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 ISL28006 is available in fixed (100V/V, 50V/V, 20V/V and
Adjustable) gains in the space saving 5 Ld SOT-23 package
and the 6 Ld SOT-23 package for the adjustable gain part. 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
• Gain Versions
- ISL28006-100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100V/V
- ISL28006-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50V/V
- ISL28006-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V/V
- ISL28006-ADJ . . . . . . . . . . . . . . . . ADJ (Min Gain = 20V/V)
• Operating Temperature Range . . . . . . . . . . . . -40°C to +125°C
• Packages. . . . . . . . . . . . . . . . . . . . . .5 Ld SOT-23, 6 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 AN1532 for “ISL28006 Evaluation Board User’s Guide”
FIGURE 1. TYPICAL APPLICATION FIGURE 2. GAIN ACCURACY vs VRS+ = 0V TO 28V
ISL28006
GND
ISL28006
ISL28006
+5VDC
+12VDC
+
-
+1.0VDC +1.0VDC
SENSE
SENSE
SENSE
OUTPUT
+5VDC
OUTPUT
+12VDC
OUTPUT
MULTIPLE
OUTPUT
POWER SUPPLY
ISENSE
+12VDC
ISENSE
+5VDC
ISENSE
+1.0VDC
+
-
+
-
RSENSE +5VDC
+5VDC
+5VDC
RSENSE
RSENSE
0246810121416182022242628
ACCURACY (%)
-1.4
-1.2
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
V
RS+
(V)
+100°C +25°C
-40°C +125°C GAIN 100
May 23, 2011
FN6548.5
ISL28006
2FN6548.5
May 23, 2011
Block Diagram
Pin Configurations
ISL28006-100, 50, 20
(5 LD SOT-23)
TOP VIEW
ISL28006-ADJ
(6 LD SOT-23)
TOP VIEW
GND
RS-
gmHI
gmLO
VSENSE
1.35V
IMIRROR
+
-OUT
Rf
Rg
R1
R5
VCC
VSENSE
R2
R3
R4
I = 2.86µA
RS+
R4
HIGH-SIDE
LOW-SIDE
SENSING
AND
GND
RS-
gmHI
gmLO
VSENSE
1.35V
IMIRROR
+
-OUT
R1
VCC
VSENSE
R2
R3
R4
I = 2.86µA
RS+
R4
HIGH-SIDE
LOW-SIDE
SENSING
AND
FB
FIXED GAIN PARTS ADJUSTABLE GAIN PART
R5
Rf
Rg
1
2
3
5
4VCC
OUT
GND
RS+
RS-
FIXED
GAIN
1
2
3
6
4
FB
OUT
VCC
GND
RS+
5R
S-
ADJ.
GAIN
Pin Descriptions
ISL28006-100, 50, 20
(5 LD SOT-23)
ISL28006-ADJ
(6 LD SOT-23) PIN NAME DESCRIPTION
16GNDPower Ground
1FBInput Pin for External Resistors
2 2 OUT Amplifier Output
33V
CC Positive Power Supply
44R
S+ Sense Voltage Non-inverting Input
55R
S- Sense Voltage Inverting Input
RS-
VCC
RS+
GND
CAPACITIVELY
COUPLED
ESD CLAMP
OUT
CAPACITIVELY
COUPLED
ESD CLAMP
FB
ISL28006
3FN6548.5
May 23, 2011
Ordering Information
PART NUMBER
(Notes 1, 2, 3) GAIN
PART MARKING
(Note 4)
PACKAGE
Tape & Reel
(Pb-Free)
PKG.
DWG. #
ISL28006FH100Z-T7 100V/V BDJA 5 Ld SOT-23 P5.064A
ISL28006FH100Z-T7A 100V/V BDJA 5 Ld SOT-23 P5.064A
ISL28006FH50Z-T7 50V/V BDHA 5 Ld SOT-23 P5.064A
ISL28006FH50Z-T7A 50V/V BDHA 5 Ld SOT-23 P5.064A
ISL28006FH20Z-T7 20V/V BDGA 5 Ld SOT-23 P5.064A
ISL28006FH20Z-T7A 20V/V BDGA 5 Ld SOT-23 P5.064A
ISL28006FHADJZ-T7 ADJ BDFA 6 Ld SOT-23 P6.064
ISL28006FHADJZ-T7A ADJ BDFA 6 Ld SOT-23 P6.064
ISL28006FH-100EVAL1Z 100V/V Evaluation Board
ISL28006FH-50EVAL1Z 50V/V Evaluation Board
ISL28006FH-20EVAL1Z 20V/V Evaluation Board
ISL28006FH-ADJEVAL1Z Adjustable Evaluation Board
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 ISL28006. For more information on MSL please see techbrief TB363.
4. The part marking is located on the bottom of the part.
ISL28006
4FN6548.5
May 23, 2011
Absolute Maximum Ratings Thermal Information
Max Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28V
Max Differential Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
Max Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±0.5V
Max Input Voltage (RS+, RS-, FB) . . . . . . . . . . . . . . . . . . . GND - 0.5V to 30V
Max Input Current for Input Voltage <GND - 0.5V. . . . . . . . . . . . . . . . ±20mA
Output Short-Circuit Duration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indefinite
Di-Electrically Isolated PR40 Process . . . . . . . . . . . . . . . . . . . Latch-up free
ESD Rating
Human Body Model (Tested per JESD22-A114F) . . . . . . . . . . . . . . . . 4kV
Machine Model (Tested per EIA/JESD22-A115-A) . . . . . . . . . . . . . . 200V
Charged Device Model (Tested per JESD22-C101D) . . . . . . . . . . . . . .1.5kV
Thermal Resistance (Typical) θJA (°C/W) θJC (°C/W)
5 Ld SOT-23 (Notes 5, 6) . . . . . . . . . . . . . . . 190 90
6 Ld SOT-23 (Notes 5, 6) . . . . . . . . . . . . . . . 180 90
Maximum Storage Temperature Range . . . . . . . . . . . . . .-65°C to +150°C
Maximum Junction Temperature (TJMAX) . . . . . . . . . . . . . . . . . . . . .+150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Recommended Operating Conditions
Ambient Temperature Range (TA) . . . . . . . . . . . . . . . . . . .-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. θJA 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 θJC, the “case temp” location is taken at the package top center.
Electrical Specifications VCC = 12V, VRS+ = 0V to 28V, VSENSE = 0V, RLOAD = 1MΩ, TA = +25°C unless otherwise specified.
Boldface limits apply over the operating temperature range, -40°C to +125°C. Temperature data established by characterization.
PARAMETER DESCRIPTION CONDITIONS
MIN
(Note 7) TYP
MAX
(Note 7) UNIT
VOS
(Input Offset
Voltage)
Gain = 100
(Notes 8, 9)
VCC = VRS+ = 12V, VSENSE = 20mV to 100mV -250 60 250 µV
-300 300 µV
VCC = 12V, VRS+ = 0.2V, VSENSE = 20mV to 100mV -2.5 -1.2 2.5 mV
-2.8 2.8 mV
Gain = 50, Gain = 20
(Notes 8, 9)
VCC = VRS+ = 12V, VSENSE = 20mV to 100mV -300 60 300 µV
-450 450 µV
VCC = 12V, VRS+ = 0.2V, VSENSE = 20mV to 100mV -2.8 -1.2 2.8 mV
-3.2 3.2 mV
Adjustable, Gain = 21
Rf = 100kΩ, Rg = 5kΩ
(Notes 8, 9)
VCC = VRS+ = 12V, VSENSE = 20mV to 100mV -300 60 300 µV
-450 450 µV
VCC = 12V, VRS+ = 0.2V, VSENSE = 20mV to 100mV -3.1 -1.2 3.1 mV
-3.4 3.4 mV
IRS+, IRS - Leakage Current VCC = 0V, VRS+ = 28V 0.041 1.2 µA
1.5 µA
IRS+
(+ Input Bias
Current)
Gain = 100 VRS+ = 2V, VSENSE = 5mV 4.7 6 µA
7µA
VRS+ = 0V, VSENSE = 5mV -500 -432 nA
-600 nA
Gain = 50, Gain = 20 VRS+ = 2V, VSENSE = 5mV 4.7 6 µA
8µA
VRS+ = 0V, VSENSE = 5mV -700 -432 nA
-840 nA
ADJ Gain = 101
Rf = 100kΩ, Rg = 1kΩ
VRS+ = 2V, VSENSE = 5mV 4.7 6 µA
7µA
VRS+ = 0V, VSENSE = 5mV -500 -432 nA
-600 nA
ISL28006
5FN6548.5
May 23, 2011
IRS -
(- Input Bias
Current)
G = 100, 50, 20, ADJ VRS+ = 2V, VSENSE = 5mV 5 50 nA
75 nA
VRS+ = 0V, VSENSE = 5mV -125 -45 nA
-130 nA
CMRR Common Mode Rejection Ratio VRS+ = 2V to 28V 105 115 dB
PSRR Power Supply Rejection Ratio VCC = 2.7V to 28V, VRS+=2V 90 105 dB
VFS Full-scale Sense Voltage VCC = 28V, VRS+ = 0.2V, 12V 200 mV
G
(Gain)
(Note 8) ISL28006-100 100 V/V
ISL28006-50 50 V/V
ISL28006-20 20 V/V
ISL28006-ADJ 20 V/V
GA
(Gain Accuracy)
Gain = 100
(Note 10)
VCC = VRS+ = 12V, VSENSE = 20mV to 100mV -0.2 0.7 %
-1 1 %
VCC = 12V, VRS+ = 0.1V, VSENSE = 20mV to 100mV -0.25 %
Gain = 50, Gain = 20
(Note 10)
VCC = VRS+ = 12V, VSENSE = 20mV to 100mV -0.35 0.7 %
-1 1 %
VCC = 12V, VRS+ = 0.1V, VSENSE = 20mV to 100mV -2.2 -0.33 2.2 %
-2.3 2.3 %
ADJ Gain = 21
Rf = 100kΩ, Rg = 5kΩ
(Note 10)
VCC = VRS+ = 12V, VSENSE = 20mV to 100mV -0.65 1 %
-1 1.05 %
VCC = 12V, VRS+ = 0.1V, VSENSE = 20mV to 100mV -2.2 -0.33 2.2 %
-2.3 2.3
VOA
(Total Output
Accuracy)
Gain = 100
(Note 11)
VCC = VRS+ = 12V, VSENSE = 100mV -0.7 0.7 %
-0.9 0.9 %
VCC = 12V, VRS+ = 0.1V, VSENSE = 100mV -1.25 %
Gain = 50, Gain = 20
(Note 11)
VCC = VRS+ = 12V, VSENSE = 100mV -0.7 0.7 %
-0.9 0.9 %
VCC = 12V, VRS+ = 0.1V, VSENSE = 100mV -4.7 -1.41 1.8 %
-5.2 2.3 %
ADJ Gain = 21
Rf = 100kΩ, Rg = 5kΩ
(Note 11)
VCC = VRS+ = 12V, VSENSE = 100mV -0.7 1.05 %
-0.9 1.2 %
VCC = 12V, VRS+ = 0.1V, VSENSE = 100mV -4.7 -1.41 1.8 %
-5.2 2.3 %
VOH Output Voltage Swing, High
VCC - VOUT
IO = -500µA, VCC = 2.7V, VSENSE = 100mV, VRS+ = 2V 39 50 mV
VOL Output Voltage Swing, Low
VOUT
IO = 500µA, VCC = 2.7V, VSENSE = 0V, VRS+ = 2V 30 50 mV
ROUT Output Resistance VCC = VRS+ = 12V, VSENSE = 100mV,
IOUT = 10µA to 1mA
6.5 Ω
ISC+ Short Circuit Sourcing Current VCC = VRS+ = 5V, RL = 10Ω4.8 mA
ISC- Short Circuit Sinking Current VCC = VRS+ = 5V, RL = 10Ω8.7 mA
Electrical Specifications VCC = 12V, VRS+ = 0V to 28V, VSENSE = 0V, RLOAD = 1MΩ, TA = +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 DESCRIPTION CONDITIONS
MIN
(Note 7) TYP
MAX
(Note 7) UNIT
ISL28006
6FN6548.5
May 23, 2011
ISGain = 100 VRS+ > 2V, VSENSE = 5mV 50 59 µA
62 µA
Gain = 50, 20, VRS+ > 2V, VSENSE = 5mV 50 62 µA
63 µA
ADJ Gain = 21
Rf = 100kΩ, Rg = 5kΩ
VRS+ > 2V, VSENSE = 5mV 50 62 µA
63 µA
VCC Supply Voltage Guaranteed by PSRR 2.7 28 V
Slew Rate Gain = 100 Pulse on RS+ pin, VOUT = 8VP-P (Figure 67) 0.58 0.76 V/µs
Gain = 50 Pulse on RS+ pin, VOUT = 8VP-P (Figure 67) 0.58 0.67 V/µs
Gain = 20 Pulse on RS+ pin, VOUT = 3.5VP-P (Figure 67) 0.50 0.67 V/µs
ADJ Gain = 21
Rf = 100kΩ, Rg = 5kΩ
Pulse on RS+ pin, VOUT = 3.5VP-P (Figure 67) 0.50 0.67 V/µs
BW-3dB Gain = 100 VRS+ = 12V, 0.1V, VSENSE = 100mV 110 kHz
Gain = 50 VRS+ = 12V, 0.1V, VSENSE = 100mV 160 kHz
Gain = 20 VRS+ = 12V, 0.1V, VSENSE = 100mV 180 kHz
ADJ, Gain = 101 (Figure 59) VRS+ = 12V, 0.1V, VSENSE = 100mV, Rf= 100kΩ,
Rg=1kΩ
40 kHz
ADJ, Gain = 51 (Figure 59) VRS+ = 12V, VSENSE = 100mV, Rf = 100kΩ, Rg= 2kΩ78 kHz
VRS+ = 0.1V, VSENSE = 100mV, Rf = 100kΩ, Rg = 2kΩ122 kHz
ADJ, Gain = 21 (Figure 59) VRS+ = 12V, VSENSE = 100mV, Rf = 100kΩ, Rg= 5kΩ131 kHz
VRS+ = 0.1V, VSENSE = 100mV, Rf = 100kΩ, Rg = 5kΩ237 kHz
tSOutput Settling Time to 1% of Final
Value
VCC = VRS+ = 12V, VOUT =10V step, V
SENSE > 7mV 15 µs
VCC = VRS+ = 0.2V, VOUT = 10V step, VSENSE > 7mV 20 µs
Capacitive-Load Stability No sustained oscillations 300 pF
tS Power-up Power-Up Time to 1% of Final Value VCC = VRS+ = 12V, VSENSE = 100mV 15 µs
VCC = 12V, VRS+ = 0.2V, VSENSE = 100mV 50 µs
Saturation Recovery Time VCC = VRS+ = 12V, VSENSE = 100mV, overdrive 10 µs
NOTES:
7. Compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design.
8. DEFINITION OF TERMS:
• VSENSEA = VSENSE @ 100mV
• VSENSEB = VSENSE @ 20mV
• VOUTA = VOUT @ VSENSEA = 100mV
• VOUTB = VOUT @ VSENSEB = 20mV
• G =
9. VOS is extrapolated from the gain measurement.
10. % Gain Accuracy = GA =
11. Output Accuracy % VOA = , where VOUT = VSENSE X GAIN and VSENSE = 100mV
Electrical Specifications VCC = 12V, VRS+ = 0V to 28V, VSENSE = 0V, RLOAD = 1MΩ, TA = +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 DESCRIPTION CONDITIONS
MIN
(Note 7) TYP
MAX
(Note 7) UNIT
GAIN
VOUTAV
OUTB–
VSENSEAV
SENSEB–
------------------------------------------------------
⎝⎠
⎜⎟
⎛⎞
=
VOS VSENSEA
VOUTA
G
-----------------
–=
GMEASURED GEXPECTED
–
GEXPECTED
---------------------------------------------------------------------
⎝⎠
⎜⎟
⎛⎞
100×
VOUTMEASURED VOUTEXPECTED
–
VOUTEXPECTED
-------------------------------------------------------------------------------------------
⎝⎠
⎜⎟
⎛⎞
100×
ISL28006
7FN6548.5
May 23, 2011
Typical Performance Curves VCC = 12V, RL = 1MΩ, unless otherwise specified.
FIGURE 3. HIGH-SIDE and LOW-SIDE THRESHOLD VOLTAGE
VRS+(L-H) and VRS+(H-L), VSENSE = 10mV
FIGURE 4. VOUT vs VRS+, VSENSE = 20mV TRANSIENT RESPONSE
FIGURE 5. LARGE SIGNAL TRANSIENT RESPONSE VRS+ = 0.2V,
VSENSE = 100mV
FIGURE 6. LARGE SIGNAL TRANSIENT RESPONSE VRS+ = 12V,
VSENSE = 100mV
FIGURE 7. VOS (µV) DISTRIBUTION AT +25°C, VRS+ =12V,
QUANTITY: 100
FIGURE 8. VOS vs VRS+
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
TIME (ms)
VOLTS (V)
VTH(L-H) = 1.52V
VTH(H-L) = 1.23V
VRS+
G100, VOUT = 1V
G50, VOUT = 500mV
G20, VOUT = 200mV
VOUT (G = 100)
0
0.4
0.8
1.2
1.6
2.0
2.4
0 0.20.40.60.81.01.21.41.61.82.0
TIME (ms)
VRS+ (V)
0
2
4
6
8
10
12
VOUT (V)
RL = 1MΩ
VCC = 12V
VRS+
G100, VOUT = 2V
G50, VOUT = 1V
G20, VOUT = 400mV
VOUT (G = 100)
0
2
4
6
8
10
12
0 102030405060708090100
TIME (µs)
VOUT (V)
GAIN 100
0
2
4
6
8
10
12
0 102030405060708090100
TIME (µs)
VOUT (V)
GAIN 100
VOS (µV)
UNITS
0
2
4
6
8
10
12
14
16
18
20
-250 -200 -150 -100 -50 0 50 100
GAIN 100
VSENSE = 20mV, 100mV
0 2 4 6 8 10121416182022242628
VRS+ (V)
VOS (µV)
-400
-200
0
200
400
600
800
1000
1200
1400
1600
1800
2000
2200
2400
2600
2800
+25°C
-40°C
+125°C +100°C
GAIN 100
VSENSE = 20mV, 100mV
ISL28006
8FN6548.5
May 23, 2011
FIGURE 9. VOS vs VRS+ FIGURE 10. VOS vs VCC, VRS+= 12V
FIGURE 11. VOS vs VCC, VRS+ = 0.1V FIGURE 12. GAIN ACCURACY vs VRS+ = 0V TO 28V
FIGURE 13. GAIN ACCURACY vs VRS+ = 0V TO 2V FIGURE 14. GAIN ACCURACY vs VCC, VRS+ = 12V
Typical Performance Curves VCC = 12V, RL = 1MΩ, unless otherwise specified. (Continued)
VRS+ (V)
VOS (µV)
-400
-200
0
200
400
600
800
1000
1200
1400
1600
1800
2000
2200
2400
2600
2800
00.20.40.60.81.0 1.2 1.4 1.6 1.8 2.0
+25°C
-40°C
+125°C +100°C
GAIN 100
VSENSE = 20mV, 100mV
-250
-200
-150
-100
-50
0
50
100
150
200
250
2 4 6 8 10 12 14 16 18 20 22 24 26 28
VCC (V)
VOS (µV)
+25°C
-40°C +125°C
+100°C
GAIN 100
VSENSE = 2mV, 20mV
-3000
-2000
-1000
0
1000
2000
3000
2 4 6 8 10 12 14 16 18 20 22 24 26 28
VCC (V)
VOS (µV)
+125°C
+100°C +25°C
-40°C
GAIN 100
VSENSE = 2mV, 20mV
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28
ACCURACY (%)
-1.4
-1.2
-1.0
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
VRS+ (V)
+100°C +25°C
-40°C +125°C
GAIN 100
VSENSE = 20mV, 100mV
VRS+ (V)
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
ACCURACY (%)
-1.4
-1.2
-1.0
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
+100°C
+25°C
-40°C
+125°C
GAIN 100
VSENSE = 20mV, 100mV
ACCURACY (%)
VCC (V)
-5
-4.5
-4.0
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
2.5
3.0
2 4 6 8 10121416182022242628
+100°C +25°C -40°C
+125°C
GAIN 100
VSENSE = 2mV, 20mV
ISL28006
9FN6548.5
May 23, 2011
FIGURE 15. GAIN ACCURACY vs VCC, VRS+ = 0.1V FIGURE 16. NORMALIZED VOA vs IOUT
FIGURE 17. GAIN vs FREQUENCY VRS+ = 100mV/12V,
VSENSE = 100mV, VOUT = 50mVP-P
FIGURE 18. VOS (µV) vs TEMPERATURE
FIGURE 19. GAIN ACCURACY (%) vs TEMPERATURE FIGURE 20. VOUT ERROR (%) vs TEMPERATURE
Typical Performance Curves VCC = 12V, RL = 1MΩ, unless otherwise specified. (Continued)
VCC (V)
ACCURACY (%)
-20
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
2
2 4 6 8 10 12 14 16 18 20 22 24 26 28
+125°C
+25°C -40°C
+100°C
GAIN 100
VSENSE = 2mV, 20mV
1µ 10µ 100µ 1m 10m
IOUT(A)
VOA PERCENT ACCURACY (%)
-1.0
-0.9
-0.8
-0.7
-0.6
-0.5
-0.4
-0.3
-0.2
-0.1
0.0
0.1
0.2
+100°C
+25°C
-40°C
+125°C
GAIN 100
10 100 1k 10k 100k 1M
FREQUENCY (Hz)
GAIN (dB)
-35
-25
-15
-5
5
15
25
35
45
GAIN 100
VCC = 12V
AV = 100
RL = 1MΩ
VSENSE = 100mV
VRS+ = 12V
VRS+= 100mV
-100
-80
-60
-40
-20
0
20
40
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
VOS (µV)
GAIN 100
VSENSE = 20mV, 100mV
VRS+ = 12V
-0.10
-0.05
0
0.05
0.10
0.15
0.20
0.25
0.30
-50-250 255075100125
TEMPERATURE (°C)
GAIN ACCURACY (%)
GAIN 100
VSENSE = 20mV, 100mV
VRS+ = 12V
-1
-0.9
-0.8
-0.7
-0.6
-0.5
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
VOUT ERROR (%)
GAIN 100
VRS+ = 12V
ISL28006
10 FN6548.5
May 23, 2011
FIGURE 21. VOS (µV) DISTRIBUTION AT +25°C, VRS+ = 12V,
QUANTITY: 100
FIGURE 22. VOS vs VRS+
FIGURE 23. VOS vs VRS+ FIGURE 24. VOS vs VCC, VRS+ = 12V
FIGURE 25. VOS vs VCC, VRS+ = VRS+ = 0.1V FIGURE 26. GAIN ACCURACY vs VRS+ = 0V TO 28V
Typical Performance Curves VCC = 12V, RL = 1MΩ, unless otherwise specified. (Continued)
VOS (µV)
UNITS
0
2
4
6
8
10
12
14
16
18
20
-250 -200 -150 -100 -50 0 50 100
GAIN 50
VSENSE = 20mV, 100mV
0 2 4 6 8 10121416182022242628
VRS+ (V)
VOS (µV)
-400
-200
0
200
400
600
800
1000
1200
1400
1600
1800
2000
2200
2400
2600
2800
+25°C
-40°C
+125°C +100°C
GAIN 50
VSENSE = 20mV, 100mV
VRS+ (V)
VOS (µV)
-400
-200
0
200
400
600
800
1000
1200
1400
1600
1800
2000
2200
2400
2600
2800
00.20.40.60.81.01.21.41.61.82.0
+25°C
-40°C
+125°C
+100°C
GAIN 50
VSENSE = 20mV, 100mV
-250
-200
-150
-100
-50
0
50
100
150
200
250
2 4 6 8 10121416182022242628
VCC (V)
VOS (µV)
+25°C
-40°C
+125°C
+100°C
GAIN 50
VSENSE = 2mV, 0mV
-3000
-2000
-1000
0
1000
2000
3000
2 4 6 8 10 12 14 16 18 20 22 24 26 28
VCC (V)
VOS (µV)
+125°C
+100°C +25°C
-40°C
GAIN 50
VSENSE = 2mV, 0mV
+100°C
+25°C -40°C
+125°C
0246810121416182022242628
ACCURACY (%)
-1.4
-1.2
-1.0
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
V
RS+
(V)
GAIN 50
VSENSE = 20mV, 100mV
ISL28006
11 FN6548.5
May 23, 2011
FIGURE 27. GAIN ACCURACY vs VRS+ = 0V TO 2V FIGURE 28. GAIN ACCURACY vs VCC, HIGH-SIDE
FIGURE 29. GAIN ACCURACY vs VCC, LOW-SIDE FIGURE 30. NORMALIZED VOA vs IOUT
FIGURE 31. GAIN vs FREQUENCY VRS+ = 100mV/12V,
VSENSE = 100mV, VOUT = 50mVP-P
FIGURE 32. VOS (µV) vs TEMPERATURE
Typical Performance Curves VCC = 12V, RL = 1MΩ, unless otherwise specified. (Continued)
V
RS+
(V)
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
ACCURACY (%)
-1.4
-1.2
-1.0
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
+100°C
+25°C
-40°C
+125°C GAIN 50
VSENSE = 20mV, 100mV
ACCURACY (%)
VCC (V)
-5.0
-4.5
-4.0
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
2.5
3.0
2 4 6 8 10121416182022242628
+100°C +25°C -40°C
+125°C
GAIN 50
VSENSE = 2mV, 20mV
VCC (V)
ACCURACY (%)
-20
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
2
2 4 6 8 10 12 14 16 18 20 22 24 26 28
+125°C
+25°C -40°C
+100°C
GAIN 50
VSENSE = 2mV, 20mV
1µ 10µ 100µ 1m 10m
I
OUT
(A)
VOA PERCENT ACCURACY (%)
-1.0
-0.9
-0.8
-0.7
-0.6
-0.5
-0.4
-0.3
-0.2
-0.1
0.0
0.1
0.2
+100°C
+25°C
-40°C
+125°C
GAIN 50
10 100 1k 10k 100k 1M
FREQUENCY (Hz)
GAIN (dB)
-35
-25
-15
-5
5
15
25
35
45
VCC = 12V
AV = 100
RL = 1MΩ
VSENSE = 100mV
VRS+ = 12V
VRS+= 100mV
GAIN 50
TEMPERATURE (°C)
VOS (µV)
-230
-210
-190
-170
-150
-130
-110
-90
-70
-50 -25 0 25 50 75 100 125
GAIN 50
VSENSE = 20mV, 100mV
VRS+ = 12V
ISL28006
12 FN6548.5
May 23, 2011
FIGURE 33. GAIN ACCURACY (%) vs TEMPERATURE FIGURE 34. VOUT ERROR (%) vs TEMPERATURE
FIGURE 35. VOS (µV) DISTRIBUTION AT +25°C, VRS+ = 12V,
QUANTITY: 100
FIGURE 36. VOS vs VRS+
FIGURE 37. VOS vs VRS+ FIGURE 38. VOS vs VCC, VRS+ = 12V
Typical Performance Curves VCC = 12V, RL = 1MΩ, unless otherwise specified. (Continued)
-50-250 255075100125
TEMPERATURE (°C)
GAIN ACCURACY (%)
0.1
0.11
0.12
0.13
0.14
0.15
0.16
0.17
0.18 GAIN 50
VSENSE = 20mV, 100mV
VRS+ = 12V
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
VOUT ERROR (%)
-0.12
-0.10
-0.08
-0.06
-0.04
-0.02
0
0.02
0.04
0.06
0.08
0.10 GAIN 50
VRS+ = 12V
VOS (µV)
UNITS
0
5
10
15
20
25
30
-250 -200 -150 -100 -50 0 50 100 150
GAIN 20
VSENSE = 20mV, 100mV
0 2 4 6 8 10121416182022242628
VRS+ (V)
VOS (µV)
-400
-200
0
200
400
600
800
1000
1200
1400
1600
1800
2000
2200
2400
2600
2800
+25°C
-40°C
+125°C +100°C
GAIN 20
VSENSE = 20mV, 100mV
VRS+ (V)
VOS (µV)
-400
-200
0
200
400
600
800
1000
1200
1400
1600
1800
2000
2200
2400
2600
2800
00.2 0.4 0.6 0.8 11.21.41.61.82
+25°C
-40°C
+125°C
+100°C
GAIN 20
VSENSE = 20mV, 100mV
-250
-200
-150
-100
-50
0
50
100
150
200
250
246810121416182022242628
VCC (V)
VOS (µV)
+25°C
-40°C +125°C
+100°C
GAIN 20
VSENSE = 2mV, 20mV
ISL28006
13 FN6548.5
May 23, 2011
FIGURE 39. VOS vs VCC, VRS+ = 0.1V FIGURE 40. GAIN ACCURACY vs VRS+ = 0V TO 28V
FIGURE 41. GAIN ACCURACY vs VRS+ = 0V TO 2V FIGURE 42. GAIN ACCURACY vs VCC, HIGH-SIDE
FIGURE 43. GAIN ACCURACY vs VCC, LOW-SIDE FIGURE 44. NORMALIZED VOA vs IOUT
Typical Performance Curves VCC = 12V, RL = 1MΩ, unless otherwise specified. (Continued)
-3000
-2000
-1000
0
1000
2000
3000
2 4 6 8 10 12 14 16 18 20 22 24 26 28
VCC (V)
VOS (µV)
+125°C
+100°C +25°C
-40°C
GAIN 20
VSENSE = 2mV, 20mV
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28
ACCURACY (%)
-1.4
-1.2
-1.0
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
V
RS+
(V)
+100°C
+25°C -40°C
+125°C
GAIN 20
VSENSE = 20mV, 100mV
V
RS+
(V)
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
ACCURACY (%)
-1.4
-1.2
-1.0
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
+100°C
+25°C
-40°C
+125°C
GAIN 20
VSENSE = 20mV, 100mV
ACCURACY (%)
VCC (V)
-5.0
-4.5
-4.0
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
2.5
3.0
2 4 6 8 10 12 14 16 18 20 22 24 26 28
+100°C +25°C -40°C
+125°C
GAIN 20
VSENSE = 2mV, 20mV
VCC (V)
ACCURACY (%)
-20
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
2
2 4 6 8 10 12 14 16 18 20 22 24 26 28
+125°C
-40°C
+100°C +25°C
GAIN 20
VSENSE = 2mV, 20mV
1µ 10µ 100µ 1m 10m
I
OUT
(A)
VOA PERCENT ACCURACY (%)
-1.0
-0.9
-0.8
-0.7
-0.6
-0.5
-0.4
-0.3
-0.2
-0.1
0.0
0.1
0.2
GAIN 20
+100°C
+25°C
-40°C
+125°C
ISL28006
14 FN6548.5
May 23, 2011
FIGURE 45. GAIN vs FREQUENCY VRS+ = 100mV/12V,
VSENSE = 100mV, VOUT = 50mVP-P
FIGURE 46. VOS (µV) vs TEMPERATURE
FIGURE 47. GAIN ACCURACY (%) vs TEMPERATURE FIGURE 48. VOUT ERROR (%) vs TEMPERATURE
FIGURE 49. VOS (µV) DISTRIBUTION AT +25°C, VRS+ = 12V,
QUANTITY: 100
FIGURE 50. VOS vs VRS+
Typical Performance Curves VCC = 12V, RL = 1MΩ, unless otherwise specified. (Continued)
10 100 1k 10k 100k 1M
FREQUENCY (Hz)
GAIN (dB)
-35
-25
-15
-5
5
15
25
35
45
VCC = 12V
AV = 100
RL = 1MΩ
VSENSE = 100mV
VRS+ = 12V
GAIN 20
VRS+ = 100mV
TEMPERATURE (°C)
VOS (µV)
-50 -25 0 25 50 75 100 125
-140
-120
-100
-80
-60
-40
-20 GAIN 20
VSENSE = 20mV, 100mV
VRS+ = 12V
0.290
0.295
0.300
0.305
0.310
0.3150
0.320
0.325
0.330
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
GAIN ACCURACY (%)
GAIN 20
VSENSE = 20mV, 100mV
VRS+ = 12V
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
VOUT ERROR (%)
0.15
0.17
0.19
0.21
0.23
0.25
0.27
0.29
0.31 GAIN 20
VRS+ = 12V
-200 -160 -120 -80 -40 0 40 80 120 160 200
VOS (µV)
UNITS
0
2
4
6
8
10
12
14
16
18
20
22
24
26 GAIN 101 ADJ
Rf = 100k, Rg = 1k
VSENSE = 20mV, 100mV
0 2 4 6 8 10121416182022242628
VRS+ (V)
VOS (µV)
-400
-200
0
200
400
600
800
1000
1200
1400
1600
1800
2000
2200
2400
2600
2800
+25°C
-40°C
+125°C +100°C
GAIN 101 ADJ
Rf = 100k, Rg = 1k
VSENSE = 20mV, 100mV
ISL28006
15 FN6548.5
May 23, 2011
FIGURE 51. VOS vs VRS+ FIGURE 52. VOS vs VCC, HIGH-SIDE
FIGURE 53. VOS vs VCC, LOW-SIDE FIGURE 54. GAIN ACCURACY vs VRS+ = 0V TO 28V
FIGURE 55. GAIN ACCURACY vs VRS+ = 0V TO 2V FIGURE 56. GAIN ACCURACY vs VCC, VRS+ = 12V
Typical Performance Curves VCC = 12V, RL = 1MΩ, unless otherwise specified. (Continued)
VRS+ (V)
VOS (µV)
-400
-200
0
200
400
600
800
1000
1200
1400
1600
1800
2000
2200
2400
2600
2800
00.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
+25°C
-40°C
+125°C
+100°C
GAIN 101 ADJ
Rf = 100k, Rg = 1k
VSENSE = 20mV, 100mV
-250
-200
-150
-100
-50
0
50
100
150
200
250
2 4 6 8 10121416182022242628
VCC (V)
VOS (µV)
+25°C
-40°C
+125°C
+100°C
GAIN 101 ADJ
Rf = 100k, Rg = 1k
VSENSE = 2mV, 20mV
-3000
-2000
-1000
0
1000
2000
3000
2 4 6 8 10 12 14 16 18 20 22 24 26 28
VCC (V)
VOS (µV)
+125°C
+100°C +25°C
-40°C
GAIN 101 ADJ
Rf = 100k, Rg = 1k
VSENSE = 2mV, 20mV
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28
ACCURACY (%)
-1.4
-1.2
-1.0
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
+100°C
+25°C
-40°C
+125°C
V
RS+
(V)
GAIN 101 ADJ
R
f
= 100k, R
g
= 1k
V
SENSE
= 20mV, 100mV
V
RS+
(V)
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
ACCURACY (%)
-1.4
-1.2
-1.0
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
+100°C
+25°C -40°C
+125°C
GAIN 101 ADJ
Rf = 100k, Rg = 1k
VSENSE = 20mV, 100mV
ACCURACY (%)
VCC (V)
-5.0
-4.5
-4.0
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
2.5
3.0
2 4 6 8 10 12 14 16 18 20 22 24 26 28
+100°C +25°C
-40°C
+125°C
GAIN 101 ADJ
Rf = 100k, Rg = 1k
VSENSE = 2mV, 20mV
ISL28006
16 FN6548.5
May 23, 2011
FIGURE 57. GAIN ACCURACY vs VCC, VRS+ = 0.1V FIGURE 58. NORMALIZED VOA vs IOUT
FIGURE 59. GAIN vs FREQUENCY VRS+ = 100mV/12V,
VSENSE = 100mV, VOUT = 50mVP-P
FIGURE 60. VOS (µV) vs TEMPERATURE
FIGURE 61. GAIN ACCURACY (%) vs TEMPERATURE FIGURE 62. VOUT ERROR (%) vs TEMPERATURE
Typical Performance Curves VCC = 12V, RL = 1MΩ, unless otherwise specified. (Continued)
VCC (V)
ACCURACY (%)
-20
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
2
2 4 6 8 10 12 14 16 18 20 22 24 26 28
+125°C
+100°C +25°C -40°C
GAIN 101 ADJ
Rf = 100k, Rg = 1k
VSENSE = 2mV, 20mV
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
0.2
1µ 10µ 100µ 1m 10m
IOUT(A)
VOA PERCENT ACCURACY (%)
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
0.2
+100°C
-40°C
GAIN 21 ADJ
Rf = 100k
Rg = 5k
+125°C
GAIN 101 ADJ
Rf = 100k
Rg = 1k
+25°C
+100°C
-40°C
+125°C
+25°C
100 1k 10k 100k 1M
FREQUENCY (Hz)
GAIN (dB)
0
5
10
15
20
25
30
35
40
45
VCC = 12V
GAIN = 21, 51, 101
RL = 1MΩ
VSENSE = 100mV
Rf = 100k
Rg = 1k, 2k, 5k
VRS+ = 12V GAIN = 21
VRS+ = 0.1V GAIN = 101
VRS+ = 12V GAIN = 51
VRS+ = 0.1V GAIN = 21
VRS+ = 12V GAIN = 51
VRS+ = 12V GAIN = 101
TEMPERATURE (°C)
VOS (µV)
-50 -25 0 25 50 75 100 125
-350
-300
-250
-200
-150
-100
-50
0
50
100
150
200
VRS+ = 12V
GAIN = 21, 101
RL = 1MΩ
VSENSE = 20mV, 100mV
Rf = 100k
Rg = 1k, 5k
GAIN = 21
GAIN = 101
0
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
GAIN ACCURACY (%)
VRS+ = 12V
GAIN = 21, 101
RL = 1MΩ
VSENSE = 20mV, 100mV
Rf = 100k
Rg = 1k, 5k
GAIN = 21
GAIN = 101
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
VOUT ERROR (%)
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
0.6
VRS+ = 12V
GAIN = 21, 101
RL = 1MΩ
VSENSE = 20mV, 100mV
Rf = 100k
Rg = 1k, 5k
GAIN = 21
GAIN = 101
ISL28006
17 FN6548.5
May 23, 2011
Applications Information
Functional Description
The ISL28006-20, ISL28006-50 and ISL28006-100 are single
supply, uni-directional current sense amplifiers with fixed gains
of 20V/V, 50V/V and 100V/V respectively. The ISL28006-ADJ is
single supply, uni-directional current sense amplifier with an
adjustable gain via external resistors (see Figure 72). The
ISL28006-ADJ is stable for gains of 20 and higher.
The ISL28006 is a 2-stage amplifier. Figure 68 shows the active
circuitry for high-side current sense applications where the sense
voltage is between 1.35V to 28V. Figure 69 shows the active
circuitry for ground sense applications where the sense voltage is
between 0V to 1.35V.
The first stage is a bi-level trans-conductance amp and level
translator. The gm stage converts the low voltage drop (VSENSE)
sensed across an external milli-ohm sense resistor, to a current
(@ gm = 21.3µA/V). The trans-conductance amplifier forces a
current through R1 resulting to a voltage drop across R1 that is
equal to the sense voltage (VSENSE). The current through R1 is
mirrored across R5 creating a ground-referenced voltage at the
input of the second amplifier equal to VSENSE.
The second stage is responsible for the overall gain and
frequency response performance of the device. The fixed gains
(20, 50, 100) are set with internal resistors Rf and Rg. The
variable gain (ADJ) has an additional FB pin and uses external
gain resistors to set the gain of the output. For the fixed gain
amps the only external component needed is a current sense
resistor (typically 0.001Ω to 0.01Ω, 1W to 2W).
The transfer function for the fixed gain parts is given in
Equation 1.
The transfer function for the adjustable gain part is given in
Equation 2.
The input gm stage derives its ~2.86µA supply current from the
input source through the RS+ terminal as long as the sensed
voltage at the RS+ pin is >1.35V and the gmHI amplifier is
selected. When the sense voltage at RS+ drops below the 1.35V
threshold, the gmLO amplifier kicks in and the gmLO output
current reverses, flowing out of the RS- pin.
Test Circuits and Waveforms
FIGURE 63. IS, VOS, VOA, CMRR, PSRR, GAIN ACCURACY FIGURE 64. INPUT BIAS CURRENT, LEAKAGE CURRENT
FIGURE 65. ts, SATURATION RECOVERY TIME FIGURE 66. GAIN vs FREQUENCY
FIGURE 67. SLEW RATE
RS+
VCC
RS-
VOUT
OUT
RL
GND
VSENSE
VRS+
1MΩ
+
-
+
-
RS+
VCC
RS-
VOUT
OUT
RL
GND
VSENSE
VRS+
1MΩ
+
-
+
-
R1
R2
V
R1
V
R
2
RS+
VCC
RS-
VOUT
OUT
RL
GND
VRS-
VRS+
1MΩ
PULSE GENERATOR
RS+
VCC
RS-
VOUT
OUT
RL
GND
VSENSE
VRS+
1MΩ
SIGNAL
GENERATOR
RS+
VCC
RS-
VOUT
OUT
RL
GND
VRS+
1MΩ
PULSE
GENERATOR
VOUT GAIN ISRSVOS
+()×=(EQ. 1)
VOUT 1
RF
RG
-------
+
⎝⎠
⎜⎟
⎛⎞
ISRSVOS
+()=(EQ. 2)
ISL28006
18 FN6548.5
May 23, 2011
RS+
RS-
gmHI
gmLO
RS
IS
+
-
LOAD
VSENSE
1.35V
IMIRROR
+
-
OUT
Rf
Rg
R1
R5
VCC
ADJ
OPTION
ONLY
HIGH-SIDE
SENSING
OPTIONAL
TRANSIENT
PROTECTION
OPTIONAL
FILTER
CAPACITOR
‘VSENSE
VCC = 2V to 28V
R2
R3
R4
FIGURE 68. HIGH-SIDE CURRENT DETECTION
I = 2.86µA
GND
VSENSE VRS+ = 2V TO 28V
FB
RS-
gmHI
gmLO
RS
IS
+
-
LOAD
VSENSE
1.35V
IMIRROR
+
-
OUT
Rf
Rg
R1
R5
VCC
ADJ
OPTION
ONLY
LOW-SIDE
SENSING
OPTIONAL
TRANSIENT
PROTECTION
OPTIONAL
FILTER
CAPACITOR
‘VSENSE
VCC = 2V TO 28V
R2
R3
R4
FIGURE 69. LOW-SIDE CURRENT DETECTION
I = 2.86µA
VCC
GND
VSENSE VRS+= 0V TO 2V
FB
RS+
ISL28006
19 FN6548.5
May 23, 2011
Hysteretic Comparator
The input trans-conductance amps are under control of a
hysteretic comparator operating from the incoming source
voltage on the RS+ pin (Figure 68). The comparator monitors the
voltage on RS+ and switches the sense amplifier from the
low-side gm amp to the high-side gm amplifier whenever the
input voltage at RS+ increases above the 1.35V threshold.
Conversely, a decreasing voltage on the RS+ pin, causes the
hysteric comparator to switch from the high-side gm amp to the
low-side gm amp as the voltage decreases below 1.35V. It is that
low-side sense gm amplifier that gives the ISL28006 the
proprietary ability to sense current all the way to 0V. Negative
voltages on the RS+ or RS- are beyond the sensing voltage range
of this amplifier.
Typical Application Circuit
Figure 72 shows the basic application circuit and optional
protection components for switched-load applications. For
applications where the load and the power source is permanently
connected, only an external sense resistor is needed. For
applications where fast transients are caused by hot plugging the
source or load, external protection components may be needed.
The external current limiting resistor (RP) in Figure 72 may be
required to limit the peak current through the internal ESD
diodes to <20mA. This condition can occur in applications that
experience high levels of in-rush current causing high peak
voltages that can damage the internal ESD diodes. An RP resistor
value of 100Ω will provide protection for a 2V transient with the
maximum of 20mA flowing through the input while adding only
an additional 13µV (worse case over-temperature) of VOS. Refer
to Equation 3:
Switching applications can generate voltage spikes that can
overdrive the amplifier input and drive the output of the amplifier
into the rails, resulting in a long overload recover time.
Capacitors CM and CD filter the common mode and differential
voltage spikes.
Error Sources
There are 3 dominant error sources: gain error, input offset
voltage error and Kelvin voltage error (see Figure 71). The gain
error is dominated by the internal resistance matching
tolerances. The remaining errors appear as sense voltage errors
at the input to the amplifier. They are VOS of the amplifier and
Kelvin voltage errors. If the transient protection resistor is added,
an additional VOS error can result from the IxR voltage due to
input bias current. The limiting resistor should only be added to
the RS- input, due to the high-side gm amplifier (gmHI) sinking
several micro amps of current through the RS+ pin.
Layout Guidelines
The Kelvin Connected Sense Resistor
The source of Kelvin voltage errors is illustrated in Figure 71. The
resistance of 1/2 Oz copper is ~1mΩ per square with a TC of
~3900ppm/°C (0.39%/°C). When you compare this unwanted
parasitic resistance with the total 1mΩ to 10mΩ resistance of
the sense resistor, it is easy to see why the sense connection
must be chosen very carefully. For example, consider a
maximum current of 20A through a 0.005Ω sense resistor,
generating a VSENSE = 0.1 and a full scale output voltage of 10V
(G = 100). Two side contacts of only 0.25 square per contact puts
the VSENSE input about 0.5 x 1mΩ away from the resistor end
capacitor. If only 10A the 20A total current flows through the
kelvin path to the resistor, you get an error voltage of 10mV
(10A x 0.5sq x 0.001Ω/sq. = 10mV) added to the 100mV sense
voltage for a sense voltage error of 10% (0.110V-0.1)/0.1V) x 100.
FIGURE 70. GAIN ACCURACY vs VRS+ = 0V TO 2V
VRS+ (V)
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
0 0.20.40.60.81.01.21.41.61.82.0
ACCURACY (%)
(EQ. 3)
RPIRS-
×()100Ω130nA×()13μV==()
FIGURE 71. PC BOARD CURRENT SENSE KELVIN CONNECTION
PC Board
Non-uniform
Current Flow
Current Sense Resistor
1 to 10mO
Current In Current Out
Kelvin VSContacts
Copper Trace
30mO/Sq.
PC Board
Non-uniform
Current Flow
Current Sense Resistor
1 to 10mO
Current In Current Out
Kelvin VSContacts
Copper Trace
30mO/Sq.
CURRENT SENSE RESISTOR
1mΩ TO 10mΩ1mΩ /SQ
CURRENT OUT
CURRENT IN
NON-UNIFORM
CURRENT FLOW
PC BOARD
KELVIN VS CONTACTS
1/2 Oz COPPER TRACE
ISL28006
20 FN6548.5
May 23, 2011
Overall Accuracy (VOA %)
VOA is defined as the total output accuracy Referred-to-Output
(RTO). The output accuracy contains all offset and gain errors, at
a single output voltage. Equation 4 is used to calculate the %
total output accuracy.
where
VOUT Actual = VSENSE x GAIN
Example: Gain = 100, For 100mV VSENSE input we measure
10.1V. The overall accuracy (VOA) is 1% as shown in Equation 5.
Power Dissipation
It is possible to exceed the +150°C maximum junction
temperatures under certain load and power supply conditions. It
is therefore important to calculate the maximum junction
temperature (TJMAX) for all applications to determine if power
supply voltages, load conditions, or package type need to be
modified to remain in the safe operating area. These parameters
are related using Equation 6:
where:
•P
DMAXTOTAL is the sum of the maximum power dissipation of
each amplifier in the package (PDMAX)
•PD
MAX for each amplifier can be calculated using Equation 7:
where:
•T
MAX = Maximum ambient temperature
•θJA = Thermal resistance of the package
•PD
MAX = Maximum power dissipation of 1 amplifier
•V
CC = Total supply voltage
•I
qMAX = Maximum quiescent supply current of 1 amplifier
•V
OUTMAX = Maximum output voltage swing of the application
•R
L = Load resistance
FIGURE 72. TYPICAL APPLICATION CIRCUIT
gmHI
gmLO
1.35V
+
-
VCC
ADJ
OPTION
ONLY
I = 2.86µA
GND
RS
RS-
RP
(1mΩ
TO
0.1Ω)
0.1VDC
TO
28VDC
+
-
CD
LOAD
CM
2.7VDC
TO
28VDC
RS+
FB
OUT
FIXED GAIN
OPTION
ONLY
VOA 100
VOUTactual VOUT ectedexp–
VOUT ectedexp
------------------------------------------------------------------------------
⎝⎠
⎜⎟
⎛⎞
×=(EQ. 4)
(EQ. 5)
VOA 100 10.1 10–
10
-------------------------
⎝⎠
⎛⎞
×1%==
TJMAX TMAX θJAxPDMAXTOTAL
+= (EQ. 6)
PDMAX VSIqMAX VS
( - VOUTMAX)VOUTMAX
RL
------------------------
×+×=(EQ. 7)
ISL28006
21 FN6548.5
May 23, 2011
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make
sure you have the latest Rev.
DATE REVISION CHANGE
4/12/11 FN6548.5 Converted to new template
Page 1 - Changed headings for “Typical Application” and “Gain Accuracy vs VRS+ = 0V to 28V” to Figure titles (Figures 1 and 2).
Page 1 - Updated Intersil Trademark statement at bottom of page 1 per directive from Legal.
Page 7 - Updated over temp note in Min Max column of spec tables from "Parameters with MIN and/or MAX limits are 100%
tested at +25°C, unless otherwise specified. Temperature limits established by characterization and are not production
tested." to new standard "Compliance to datasheet limits is assured by one or more methods: production test, characterization
and/or design."
Page 19 - Figure 69, Low side current detection schematic: Moved the LOAD from the ground side of the power side circuit to
the high side.
9/2/10 FN6548.4 Added -T7A tape and reel options to Ordering Information Table for all packages.
5/12/10 FN6548.3 Added Note 4 to Part Marking Column in “Ordering Information” on page 3.
Corrected hyperlinks in Notes 1 and 3 in “Ordering Information” on page 3.
4/8/10 Removed “Coming Soon” from evaluation boards in “Ordering Information” on page 3.
4/7/10 Added “Related Literature” on page 1
Updated Package Drawing Number in the “Ordering Information” on page 3 for the 20V, 50V and 100V options from MDP0038
to P50.64A.
Revised package outline drawing from MDP0038 to P5.064A on page 24. MDP0038 package contained 2 packages for both
the 5 and 6 Ld SOT-23. MDP0038 was obsoleted and the packages were separated and made into 2 separate package outline
drawings; P5.064A and P6.064A. Changes to the 5 Ld SOT-23 were to move dimensions from table onto drawing, add land
pattern and add JEDEC reference number.
3/10/10 FN6548.2 Releasing adjustable gain option.
Added adjustable block diagram (Page 2), Added adjustable gain limits to electrical spec table, added Figures 47 through 60,
Added +85°C curves to Figures 6 thru 14, 20 thru 28, 34 thru 42, and Figures 48 thru 56. Modified Figure 70.
2/4/10 FN6548.1 -Page 1:
Edited last sentence of paragraph 2.
Moved order of GAIN listings from 20, 50, 100 to 100, 50, 20 in the 3rd paragraph.
Under Features ....removed "Low Input Offset Voltage 250µV, max"
Under Features .... moved order of parts listing from 20, 50, 100 (from top to bottom) to 100, 50, 20.
-Page 3: Removed coming soon on ISL28006FH50Z and ISL28006FH20Z and changes the order or listing them to 100, 50, 20.
-Page 5: VOA test. Under conditions column ...deleted 20mV to. It now reads ... Vsense = 100mV
SR test. Under conditions column ..deleted what was there. It now reads ... Pulse on RS+pin, See Figure 51
-Page 6: ts test. Removed Gain = 100 and Gain = 100V/V in both description and conditions columns respectively.
-Page 9: Added VRS+= 12V to Figures 16, 17, 18.
-Page 11: Added VRS+= 12V to Figures 30, 31, 32.
-Page 13 & 14: Added VRS+= 12V to Figures 44, 45, 46.
-Page 14 Added Figure 51 and adjusted figure numbers to account for the added figure.
-Figs 8, 26, and 40 change "HIGH SIDE" to "VRS = 12V", where RS is subscript.
-Figs 9, 27, and 41 change "LOW SIDE" to "VRS = 0.1V", where RS is subscript.
12/14/09 FN6548.0 Initial Release
ISL28006
22
Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems as noted
in the quality certifications found at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time
without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be
accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
FN6548.5
May 23, 2011
For additional products, see www.intersil.com/product_tree
Products
Intersil Corporation is a leader in the design and manufacture of high-performance analog semiconductors. The Company's products
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Intersil's product families address power management and analog signal processing functions. Go to www.intersil.com/products for a
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*For a complete listing of Applications, Related Documentation and Related Parts, please see the respective device information page
on intersil.com: ISL28006
To report errors or suggestions for this datasheet, please go to www.intersil.com/askourstaff
FITs are available from our website at http://rel.intersil.com/reports/search.php
ISL28006
23 FN6548.5
May 23, 2011
Package Outline Drawing
P5.064A
5 LEAD SMALL OUTLINE TRANSISTOR PLASTIC PACKAGE
Rev 0, 2/10
Dimension is exclusive of mold flash, protrusions or gate burrs.
This dimension is measured at Datum “H”.
Package conforms to JEDEC MO-178AA.
Foot length is measured at reference to guage plane.
Dimensions in ( ) for Reference Only.
Dimensioning and tolerancing conform to ASME Y14.5M-1994.
6.
3.
5.
4.
2.
Dimensions are in millimeters.1.
NOTES:
DETAIL "X"
SIDE VIEW
TYPICAL RECOMMENDED LAND PATTERN
TOP VIEW
INDEX AREA
PIN 1
SEATING PLANE
GAUGE
0.45±0.1
(2 PLCS)
10° TYP
4
1.90
0.40 ±0.05
2.90
0.95
1.60
2.80
0.05-0.15
1.14 ±0.15
0.20 CA-B DM
(1.20)
(0.60)
(0.95)
(2.40)
0.10 C
0.08-0.20
SEE DETAIL X
1.45 MAX
(0.60)
0-3°
C
B
A
D
3
3
3
0.20 C
(1.90)
2x
0.15 C
2x
D
0.15 C
2x
A-B
(0.25)
H
5
2
4
5
5
END VIEW
PLANE
ISL28006
24 FN6548.5
May 23, 2011
Package Outline Drawing
P6.064
6 LEAD SMALL OUTLINE TRANSISTOR PLASTIC PACKAGE
Rev 4, 2/10
Dimension is exclusive of mold flash, protrusions or gate burrs.
Package conforms to JEDEC MO-178AB.
Foot length is measured at reference to guage plane.
Dimensions in ( ) for Reference Only.
Dimensioning and tolerancing conform to ASME Y14.5M-1994.
5.
3.
4.
2.
Dimensions are in millimeters.1.
NOTES:
DETAIL "X"
SIDE VIEW
TYPICAL RECOMMENDED LAND PATTERN
TOP VIEW
END VIEW
INDEX AREA
PIN 1
SEATING PLANE
GAUGE
0.45±0.1
(2 PLCS)
10° TYP
4
1.90
0.40 ±0.10
2.90 ±0.10
0.95
1.60 +0.15/-0.10
2.80
0.00-0.15
1.15 +0.15/-0.25
0.20 CA-B DM
(1.20)
(0.60)
(0.95)
(2.40)
0.10 C
0.08-0.22
SEE DETAIL X
(0.25)
1.45 MAX
(0.60)
0-8°
C
B
A
D
3
3
3
3
0.20 C
2x
123
654
PLANE