Intersil ISL28006FH50Z-T7 Micropower, rail to rail input current sense amplifier Datasheet

Micropower, Rail to Rail Input Current Sense Amplifier with
Voltage Output
ISL28006
Features
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.
• Low Power Consumption. . . . . . . . . . . . . . . . . . . . . . 50µA, Typ
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.
• 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”
SENSE
+12VDC
OUTPUT
RSENSE
+5VDC
ISL28006
+
SENSE
+5VDC
RSENSE
-
ISENSE
+12VDC
0.6
+5VDC
OUTPUT
0.2
+5VDC
ISL28006
+
ISENSE
+5VDC
SENSE
+1.0VDC
RSENSE
MULTIPLE
OUTPUT
POWER SUPPLY
+5VDC
ISL28006
+
+1.0VDC
OUTPUT
ISENSE
+1.0VDC
+25°C +125°C
GAIN 100
0
-0.4
-0.6
-0.8
-1
-1.2
0
2
4
6
8
10 12 14 16 18 20 22 24 26 28
VRS+ (V)
FIGURE 1. TYPICAL APPLICATION
May 23, 2011
FN6548.5
-40°C
-0.2
-1.4
GND
+100°C
0.4
ACCURACY (%)
+12VDC
1
FIGURE 2. GAIN ACCURACY vs VRS+ = 0V TO 28V
CAUTION: 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.
ISL28006
Block Diagram
VCC
VCC
I = 2.86µA
I = 2.86µA
VSENSE
VSENSE
HIGH-SIDE
AND
LOW-SIDE
SENSING
RS+
R1
gmHI
HIGH-SIDE
AND
LOW-SIDE
SENSING
RS+
R1
RS-
gmHI
RSR2
RR44
OUT
-
1.35V
R3
R2
+
gmLO
R3
Rg
VSENSE
IMIRROR
RR44
GND
FIXED GAIN PARTS
OUT
-
1.35V
Rf
R5
+
Rf
FB
gmLO
Rg
R5
VSENSE
IMIRROR
GND
ADJUSTABLE GAIN PART
Pin Configurations
ISL28006-ADJ
(6 LD SOT-23)
TOP VIEW
ISL28006-100, 50, 20
(5 LD SOT-23)
TOP VIEW
GND 1
OUT 2
FB 1
5 RSFIXED
GAIN
ADJ.
GAIN
OUT 2
VCC 3
4 RS+
VCC 3
6 GND
5 RS4 RS+
Pin Descriptions
ISL28006-100, 50, 20
(5 LD SOT-23)
ISL28006-ADJ
(6 LD SOT-23)
PIN NAME
1
6
GND
1
FB
2
2
OUT
Amplifier Output
3
3
VCC
Positive Power Supply
4
4
RS+
Sense Voltage Non-inverting Input
5
5
RS-
Sense Voltage Inverting Input
DESCRIPTION
Power Ground
Input Pin for External Resistors
FB
VCC
RS-
CAPACITIVELY
COUPLED
ESD CLAMP
OUT
RS+
GND
2
FN6548.5
May 23, 2011
ISL28006
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART MARKING
(Note 4)
GAIN
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.
3
FN6548.5
May 23, 2011
ISL28006
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
VOS
(Input Offset
Voltage)
DESCRIPTION
Gain = 100
(Notes 8, 9)
CONDITIONS
VCC = VRS+ = 12V, VSENSE = 20mV to 100mV
MIN
(Note 7)
TYP
MAX
(Note 7)
UNIT
-250
60
250
µV
300
µV
-1.2
2.5
mV
2.8
mV
60
300
µV
450
µV
2.8
mV
3.2
mV
300
µV
-300
VCC = 12V, VRS+ = 0.2V, VSENSE = 20mV to 100mV
-2.5
VCC = VRS+ = 12V, VSENSE = 20mV to 100mV
-300
-2.8
Gain = 50, Gain = 20
(Notes 8, 9)
-450
VCC = 12V, VRS+ = 0.2V, VSENSE = 20mV to 100mV
-2.8
-1.2
-3.2
Adjustable, Gain = 21
Rf = 100kΩ, Rg = 5kΩ
(Notes 8, 9)
VCC = VRS+ = 12V, VSENSE = 20mV to 100mV
-300
60
-450
VCC = 12V, VRS+ = 0.2V, VSENSE = 20mV to 100mV
-3.1
-1.2
-3.4
IRS+, IRS IRS+
(+ Input Bias
Current)
Leakage Current
Gain = 100
VCC = 0V, VRS+ = 28V
0.041
VRS+ = 2V, VSENSE = 5mV
VRS+ = 0V, VSENSE = 5mV
4.7
-500
450
µV
3.1
mV
3.4
mV
1.2
µA
1.5
µA
6
µA
7
µA
-432
nA
-600
Gain = 50, Gain = 20
VRS+ = 2V, VSENSE = 5mV
VRS+ = 0V, VSENSE = 5mV
nA
4.7
-700
6
µA
8
µA
-432
nA
-840
ADJ Gain = 101
Rf = 100kΩ, Rg = 1kΩ
VRS+ = 2V, VSENSE = 5mV
VRS+ = 0V, VSENSE = 5mV
4.7
-500
-600
4
nA
-432
6
µA
7
µA
nA
nA
FN6548.5
May 23, 2011
ISL28006
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
IRS (- Input Bias
Current)
DESCRIPTION
G = 100, 50, 20, ADJ
CONDITIONS
MIN
(Note 7)
VRS+ = 2V, VSENSE = 5mV
TYP
MAX
(Note 7)
UNIT
5
50
nA
75
VRS+ = 0V, VSENSE = 5mV
-125
-45
nA
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
G
(Gain)
(Note 8)
ISL28006-100
100
V/V
ISL28006-50
50
V/V
ISL28006-20
20
V/V
GA
(Gain Accuracy)
Gain = 100
(Note 10)
ISL28006-ADJ
20
VCC = VRS+ = 12V, VSENSE = 20mV to 100mV
-0.2
0.7
%
-1
1
%
VCC = 12V, VRS+ = 0.1V, VSENSE = 20mV to 100mV
Gain = 50, Gain = 20
(Note 10)
ADJ Gain = 21
Rf = 100kΩ, Rg = 5kΩ
(Note 10)
VCC = VRS+ = 12V, VSENSE = 20mV to 100mV
-0.25
%
-0.35
0.7
%
-1
1
%
2.2
%
-2.2
-2.3
2.3
%
VCC = VRS+ = 12V, VSENSE = 20mV to 100mV
-0.65
1
%
-1
1.05
%
2.2
%
Gain = 100
(Note 11)
VCC = VRS+ = 12V, VSENSE = 100mV
Gain = 50, Gain = 20
(Note 11)
VCC = VRS+ = 12V, VSENSE = 100mV
-2.2
VCC = 12V, VRS+ = 0.1V, VSENSE = 100mV
-0.33
-0.33
-2.3
2.3
-0.7
0.7
%
-0.9
0.9
%
VCC = 12V, VRS+ = 0.1V, VSENSE = 100mV
ADJ Gain = 21
Rf = 100kΩ, Rg = 5kΩ
(Note 11)
V/V
VCC = 12V, VRS+ = 0.1V, VSENSE = 20mV to 100mV
VCC = 12V, VRS+ = 0.1V, VSENSE = 20mV to 100mV
VOA
(Total Output
Accuracy)
mV
-1.25
%
-0.7
0.7
%
-0.9
0.9
%
-4.7
1.8
%
-5.2
-1.41
2.3
%
VCC = VRS+ = 12V, VSENSE = 100mV
-0.7
1.05
%
VCC = 12V, VRS+ = 0.1V, VSENSE = 100mV
-4.7
-0.9
-1.41
-5.2
1.2
%
1.8
%
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 = 10Ω
4.8
mA
ISC-
Short Circuit Sinking Current
VCC = VRS+ = 5V, RL = 10Ω
8.7
mA
5
FN6548.5
May 23, 2011
ISL28006
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
IS
VCC
Slew Rate
BW-3dB
DESCRIPTION
tS Power-up
MIN
(Note 7)
TYP
MAX
(Note 7)
UNIT
µA
Gain = 100
VRS+ > 2V, VSENSE = 5mV
50
59
62
µA
Gain = 50, 20,
VRS+ > 2V, VSENSE = 5mV
50
62
µA
63
µA
62
µA
63
µA
28
V
ADJ Gain = 21
Rf = 100kΩ, Rg = 5kΩ
VRS+ > 2V, VSENSE = 5mV
Supply Voltage
Guaranteed by PSRR
2.7
50
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
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 = 2kΩ
78
kHz
VRS+ = 0.1V, VSENSE = 100mV, Rf = 100kΩ, Rg = 2kΩ
122
kHz
ADJ, Gain = 21 (Figure 59)
tS
CONDITIONS
VRS+ = 12V, VSENSE = 100mV, Rf = 100kΩ, Rg = 5kΩ
131
kHz
VRS+ = 0.1V, VSENSE = 100mV, Rf = 100kΩ, Rg = 5kΩ
237
kHz
Output Settling Time to 1% of Final
Value
VCC = VRS+ = 12V, VOUT = 10V step, VSENSE > 7mV
15
µs
VCC = VRS+ = 0.2V, VOUT = 10V step, VSENSE > 7mV
20
µs
Capacitive-Load Stability
No sustained oscillations
300
pF
Power-Up Time to 1% of Final Value
VCC = VRS+ = 12V, VSENSE = 100mV
15
µs
VCC = 12V, VRS+ = 0.2V, VSENSE = 100mV
50
µs
VCC = VRS+ = 12V, VSENSE = 100mV, overdrive
10
µs
Saturation Recovery Time
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
⎛ V OUT A – V OUT B ⎞
• G = GAIN = ⎜ ------------------------------------------------------⎟
⎝ V SENSE A – V SENSE B⎠
V OUT A
9. VOS is extrapolated from the gain measurement. V OS = V SENSE A – ----------------G
⎛ G MEASURED – G EXPECTED⎞
10. % Gain Accuracy = GA = ⎜ ---------------------------------------------------------------------⎟ × 100
G EXPECTED
⎝
⎠
⎛ VOUT MEASURED – VOUT EXPECTED⎞
11. Output Accuracy % VOA = ⎜ -------------------------------------------------------------------------------------------⎟ × 100, where VOUT = VSENSE X GAIN and VSENSE = 100mV
VOUT EXPECTED
⎝
⎠
6
FN6548.5
May 23, 2011
ISL28006
Typical Performance Curves VCC = 12V, RL = 1MΩ, unless otherwise specified.
1.6
VRS+
2.0
1.4
VTH(L-H) = 1.52V
1.2
0.8
VOUT (G = 100)
0.6
0.2
1.2
0
0
0.2
0.4
0.6
0.8 1.0 1.2
TIME (ms)
1.4
1.6
1.8
2.0
FIGURE 3. HIGH-SIDE and LOW-SIDE THRESHOLD VOLTAGE
VRS+(L-H) and VRS+(H-L), VSENSE = 10mV
6
4
G100, VOUT = 2V
G50, VOUT = 1V
G20, VOUT = 400mV
0.4
0
8
RL = 1MΩ
VCC = 12V
0.8
G100, VOUT = 1V
G50, VOUT = 500mV
G20, VOUT = 200mV
0.4
10
VOUT (G = 100)
1.6
VTH(H-L) = 1.23V
1.0
VRS+ (V)
VOLTS (V)
12
2.4
VRS+
0
0.2
0.4
0.6
0.8
1.0 1.2
TIME (ms)
2
1.4
0
2.0
GAIN 100
10
10
8
8
VOUT (V)
VOUT (V)
1.8
12
GAIN 100
6
6
4
4
2
2
0
10
20
30
40
50
60
70
80
90
0
100
0
10
20
30
TIME (µs)
FIGURE 5. LARGE SIGNAL TRANSIENT RESPONSE VRS+ = 0.2V,
VSENSE = 100mV
GAIN 100
18 VSENSE = 20mV, 100mV
16
14
VOS (µV)
12
10
8
6
4
2
0
-250
-200
-150
-100 -50
VOS (µV)
0
50
100
FIGURE 7. VOS (µV) DISTRIBUTION AT +25°C, VRS+ = 12V,
QUANTITY: 100
7
40
50
60
TIME (µs)
70
80
90
100
FIGURE 6. LARGE SIGNAL TRANSIENT RESPONSE VRS+ = 12V,
VSENSE = 100mV
20
UNITS
1.6
FIGURE 4. VOUT vs VRS+, VSENSE = 20mV TRANSIENT RESPONSE
12
0
VOUT (V)
1.8
2800
2600
2400
2200
2000
1800
1600
1400
1200
1000
800
600
400
200
0
-200
-400
GAIN 100
VSENSE = 20mV, 100mV
+125°C
+100°C
-40°C
0
2
4
6
8
+25°C
10 12 14 16 18 20 22 24 26 28
VRS+ (V)
FIGURE 8. VOS vs VRS+
FN6548.5
May 23, 2011
ISL28006
Typical Performance Curves VCC = 12V, RL = 1MΩ, unless otherwise specified. (Continued)
250
GAIN 100
VSENSE = 20mV, 100mV
+125°C
+100°C
200
150
+100°C
+25°C
100
VOS (µV)
VOS (µV)
2800
2600
2400
2200
2000
1800
1600
1400
1200
1000
800
600
400
200
0
-200
-400
+25°C
-40°C
50
0
-50
-40°C
-100
+125°C
-150
GAIN 100
VSENSE = 2mV, 20mV
-200
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
-250
2
2.0
4
6
8
VRS+ (V)
FIGURE 9. VOS vs VRS+
3000
+100°C
FIGURE 10. VOS vs VCC, VRS+= 12V
0.6
GAIN 100
VSENSE = 2mV, 20mV
+25°C
2000
+100°C
0.4
-40°C
ACCURACY (%)
-40°C
+125°C
0
-1000
0
-0.2
-0.4
-0.6
-0.8
-1.0
-2000
GAIN 100
VSENSE = 20mV, 100mV
-1.2
-3000
2
4
6
8
-1.4
10 12 14 16 18 20 22 24 26 28
VCC (V)
FIGURE 11. VOS vs VCC, VRS+ = 0.1V
0.6
+100°C
0
ACCURACY (%)
ACCURACY (%)
0.2
-0.2
-0.4
-40°C
-0.6
+125°C
-0.8
-1.0
GAIN 100
VSENSE = 20mV, 100mV
-1.2
0
0.2
0.4
0.6
0.8 1.0 1.2
VRS+ (V)
1.4
1.6
1.8
FIGURE 13. GAIN ACCURACY vs VRS+ = 0V TO 2V
8
0
2
4
6
8
10 12 14 16 18 20 22 24 26 28
VRS+ (V)
FIGURE 12. GAIN ACCURACY vs VRS+ = 0V TO 28V
+25°C
0.4
-1.4
+25°C +125°C
0.2
1000
VOS (µV)
10 12 14 16 18 20 22 24 26 28
VCC (V)
2.0
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
-3.5
-4.0
-4.5
-5
+100°C
+25°C
-40°C
+125°C
GAIN 100
VSENSE = 2mV, 20mV
2
4
6
8
10 12 14 16 18 20 22 24 26 28
VCC (V)
FIGURE 14. GAIN ACCURACY vs VCC, VRS+ = 12V
FN6548.5
May 23, 2011
ISL28006
Typical Performance Curves VCC = 12V, RL = 1MΩ, unless otherwise specified. (Continued)
0.2
0
0.1
-2
ACCURACY (%)
-40°C
+25°C
-4
+100°C
-6
-8
+125°C
-10
-12
-14
-16
GAIN 100
VSENSE = 2mV, 20mV
-18
-20
2
4
6
8
VOA PERCENT ACCURACY (%)
2
GAIN 100
0.0
-0.1
-0.2
-0.3
-40°C
-0.4
+125°C
-0.5
-0.6
+100°C
-0.7
-0.8
-0.9
+25°C
-1.0
1µ
10 12 14 16 18 20 22 24 26 28
10µ
100µ
IOUT(A)
VCC (V)
FIGURE 15. GAIN ACCURACY vs VCC, VRS+ = 0.1V
45
40
35 GAIN 100
20
GAIN 100
VSENSE = 20mV, 100mV
VRS+ = 12V
0
15
VOS (µV)
GAIN (dB)
10m
FIGURE 16. NORMALIZED VOA vs IOUT
25
VRS+= 100mV
5
-5
VCC = 12V
-15 V
SENSE = 100mV
A = 100
-25 V
RL = 1MΩ
-35
10
100
VRS+ = 12V
-20
-40
-60
-80
1k
10k
FREQUENCY (Hz)
100k
1M
-100
-50
FIGURE 17. GAIN vs FREQUENCY VRS+ = 100mV/12V,
VSENSE = 100mV, VOUT = 50mVP-P
0.30
0
25
50
75
TEMPERATURE (°C)
-0.5
100
125
GAIN 100
VRS+ = 12V
-0.6
VOUT ERROR (%)
0.20
-25
FIGURE 18. VOS (µV) vs TEMPERATURE
GAIN 100
VSENSE = 20mV, 100mV
VRS+ = 12V
0.25
GAIN ACCURACY (%)
1m
0.15
0.10
0.05
0
-0.7
-0.8
-0.9
-0.05
-0.10
-50
-25
0
25
50
75
100
TEMPERATURE (°C)
FIGURE 19. GAIN ACCURACY (%) vs TEMPERATURE
9
125
-1
-50
-25
0
25
50
75
TEMPERATURE (°C)
100
125
FIGURE 20. V OUT ERROR (%) vs TEMPERATURE
FN6548.5
May 23, 2011
ISL28006
Typical Performance Curves VCC = 12V, RL = 1MΩ, unless otherwise specified. (Continued)
20
GAIN 50
18 VSENSE = 20mV, 100mV
16
12
VOS (µV)
UNITS
14
10
8
6
4
2
0
-250
-200
-150
-100 -50
VOS (µV)
0
50
100
2800
2600
2400
2200
2000
1800
1600
1400
1200
1000
800
600
400
200
0
-200
-400
GAIN 50
VSENSE = 20mV, 100mV
+125°C
-40°C
0
2
4
150
+100°C
+100°C
100
VOS (µV)
VOS (µV)
GAIN 50
VSENSE = 2mV, 0mV
200
+25°C
-40°C
50
+125°C
0
-50
+25°C
-100
-150
-40°C
-200
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
-250
2
2.0
FIGURE 23. VOS vs VRS+
3000
4
6
8
+100°C
0.6
+25°C
0.4
+125°C
0
-1000
ACCURACY (%)
1000
-40°C
+25°C
0.2
-40°C
10 12 14 16 18 20 22 24 26 28
VCC (V)
FIGURE 24. VOS vs VCC, VRS+ = 12V
2000
VOS (µV)
+25°C
10 12 14 16 18 20 22 24 26 28
250
VRS+ (V)
0
-0.2
+100°C
-0.4
+125°C
-0.6
-0.8
-1.0
-2000
-3000
8
FIGURE 22. VOS vs VRS+
GAIN 50
VSENSE = 20mV, 100mV
+125°C
6
VRS+ (V)
FIGURE 21. VOS (µV) DISTRIBUTION AT +25°C, VRS+ = 12V,
QUANTITY: 100
2800
2600
2400
2200
2000
1800
1600
1400
1200
1000
800
600
400
200
0
-200
-400
+100°C
GAIN 50
VSENSE = 2mV, 0mV
2
4
6
8
10 12 14 16 18 20 22 24 26 28
VCC (V)
FIGURE 25. VOS vs VCC, VRS+ = VRS+ = 0.1V
10
GAIN 50
VSENSE = 20mV, 100mV
-1.2
-1.4
0
2
4
6
8
10 12 14 16 18 20 22 24 26 28
VRS+ (V)
FIGURE 26. GAIN ACCURACY vs VRS+ = 0V TO 28V
FN6548.5
May 23, 2011
ISL28006
Typical Performance Curves VCC = 12V, RL = 1MΩ, unless otherwise specified. (Continued)
0.6
0.4
+25°C
ACCURACY (%)
ACCURACY (%)
0.2
0
-0.2
-0.4
+100°C
-0.6
-0.8
-1.0
-1.4
-40°C
+125°C
-1.2
0
0.2
0.4
0.6
GAIN 50
VSENSE = 20mV, 100mV
0.8 1.0 1.2
VRS+ (V)
1.4
1.6
1.8
2.0
FIGURE 27. GAIN ACCURACY vs VRS+ = 0V TO 2V
0.1
+25°C
-40°C
+100°C
-6
-8
-10
-12
+125°C
-14
-16
GAIN 50
VSENSE = 2mV, 20mV
-18
-20
2
4
6
8
VOA PERCENT ACCURACY (%)
0.2
0
-4
+100°C
GAIN 50
VSENSE = 2mV, 20mV
2
4
6
8
10 12 14 16 18 20 22 24 26 28
VCC (V)
GAIN 50
0.0
-0.1
-0.2
-0.3
-40°C
-0.4
-0.5
+125°C
-0.6
-0.7
+100°C
-0.8
-0.9
+25°C
10µ
100µ
IOUT(A)
VCC (V)
FIGURE 29. GAIN ACCURACY vs VCC, LOW-SIDE
-90
25
-110
15
VOS (µV)
GAIN (dB)
-70
35
VRS+= 100mV
-5
VRS+ = 12V
VCC = 12V
-15 V
SENSE = 100mV
A = 100
-25 V
RL = 1MΩ
-35
10
100
1m
10m
FIGURE 30. NORMALIZED VOA vs IOUT
GAIN 50
5
-40°C
+125°C
-1.0
1µ
10 12 14 16 18 20 22 24 26 28
45
+25°C
FIGURE 28. GAIN ACCURACY vs VCC, HIGH-SIDE
2
-2
ACCURACY (%)
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
-3.5
-4.0
-4.5
-5.0
GAIN 50
VSENSE = 20mV, 100mV
VRS+ = 12V
-130
-150
-170
-190
-210
1k
10k
FREQUENCY (Hz)
100k
FIGURE 31. GAIN vs FREQUENCY VRS+ = 100mV/12V,
VSENSE = 100mV, VOUT = 50mVP-P
11
1M
-230
-50
-25
0
25
50
75
TEMPERATURE (°C)
100
125
FIGURE 32. VOS (µV) vs TEMPERATURE
FN6548.5
May 23, 2011
ISL28006
Typical Performance Curves VCC = 12V, RL = 1MΩ, unless otherwise specified. (Continued)
0.18
0.17
0.16
GAIN 50
0.08
VRS+ = 12V
0.06
VOUT ERROR (%)
GAIN ACCURACY (%)
0.10
GAIN 50
VSENSE = 20mV, 100mV
VRS+ = 12V
0.15
0.14
0.13
0.12
0.04
0.02
0
-0.02
-0.04
-0.06
-0.08
0.11
-0.10
0.1
-50
-25
0
25
50
75
100
-0.12
-50
125
-25
0
TEMPERATURE (°C)
FIGURE 33. GAIN ACCURACY (%) vs TEMPERATURE
30
2800
2600
2400
2200
2000
1800
1600
1400
1200
1000
800
600
400
200
0
-200
-400
VOS (µV)
UNITS
20
15
10
5
0
-250
-200
-150
-100
-50
0
VOS (µV)
50
100
150
0
2
4
8
+100°C
-40°C
+25°C
10 12 14 16 18 20 22 24 26 28
FIGURE 36. VOS vs VRS+
250
GAIN 20
VSENSE = 20mV, 100mV
+125°C
6
+125°C
VRS+ (V)
GAIN 20
VSENSE = 2mV, 20mV
200
150
100
VOS (µV)
VOS (µV)
+100°C
125
GAIN 20
VSENSE = 20mV, 100mV
FIGURE 35. VOS (µV) DISTRIBUTION AT +25°C, VRS+ = 12V,
QUANTITY: 100
2800
2600
2400
2200
2000
1800
1600
1400
1200
1000
800
600
400
200
0
-200
-400
100
FIGURE 34. V OUT ERROR (%) vs TEMPERATURE
GAIN 20
VSENSE = 20mV, 100mV
25
25
50
75
TEMPERATURE (°C)
+25°C
-40°C
+100°C
50
0
+25°C
-50
-40°C
-100
+125°C
-150
-200
0
0.2
0.4
0.6
0.8
1
1.2
VRS+ (V)
FIGURE 37. VOS vs VRS+
12
1.4
1.6
1.8
2
-250
2
4
6
8
10 12 14 16 18 20 22 24 26 28
VCC (V)
FIGURE 38. VOS vs VCC, VRS+ = 12V
FN6548.5
May 23, 2011
ISL28006
Typical Performance Curves VCC = 12V, RL = 1MΩ, unless otherwise specified. (Continued)
3000
0.6
GAIN 20
VSENSE = 2mV, 20mV
+25°C
+100°C
0.4
2000
-40°C
ACCURACY (%)
VOS (µV)
1000
+125°C
0
-1000
-40°C
+25°C
0.2
0
-0.2
-0.6
-0.8
-1.0
-2000
GAIN 20
VSENSE = 20mV, 100mV
-1.2
-3000
2
4
6
8
-1.4
10 12 14 16 18 20 22 24 26 28
VCC (V)
FIGURE 39. VOS vs VCC, VRS+ = 0.1V
0.6
+25°C
0
ACCURACY (%)
ACCURACY (%)
0.2
-0.2
-0.4
-0.6
+100°C
-40°C
-0.8
-1.0
-1.2
+125°C
0
0.2
0.4
0.6
0.8 1.0 1.2
VRS+ (V)
1.4
1.6
1.8
2.0
FIGURE 41. GAIN ACCURACY vs VRS+ = 0V TO 2V
0.1
-6
+25°C
-40°C
-8
-10
-12
+125°C
-14
-16
GAIN 20
VSENSE = 2mV, 20mV
-18
-20
2
4
6
8
10 12 14 16 18 20 22 24 26 28
VCC (V)
FIGURE 43. GAIN ACCURACY vs VCC, LOW-SIDE
13
VOA PERCENT ACCURACY (%)
0.2
+100°C
2
4
6
8
10 12 14 16 18 20 22 24 26 28
VRS+ (V)
GAIN 20
VSENSE = 2mV, 20mV
+100°C
+25°C
-40°C
+125°C
2
4
6
8
10 12 14 16 18 20 22 24 26 28
VCC (V)
FIGURE 42. GAIN ACCURACY vs VCC, HIGH-SIDE
0
-2
ACCURACY (%)
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
-3.5
-4.0
-4.5
-5.0
2
-4
0
FIGURE 40. GAIN ACCURACY vs VRS+ = 0V TO 28V
GAIN 20
VSENSE = 20mV, 100mV
0.4
-1.4
+100°C
+125°C
-0.4
GAIN 20
0.0
-0.1
-0.2
+25°C
-0.3
-0.4
+125°C
-0.5
-0.6
+100°C
-0.7
-0.8
-40°C
-0.9
-1.0
1µ
10µ
100µ
IOUT(A)
1m
10m
FIGURE 44. NORMALIZED VOA vs IOUT
FN6548.5
May 23, 2011
ISL28006
Typical Performance Curves VCC = 12V, RL = 1MΩ, unless otherwise specified. (Continued)
45
-20
GAIN 20
35
GAIN 20
VSENSE = 20mV, 100mV
VRS+ = 12V
-40
25
GAIN (dB)
VOS (µV)
-60
15
VRS+ = 100mV
5
VRS+ = 12V
-5
VCC = 12V
-15 V
SENSE = 100mV
A = 100
-25 V
RL = 1MΩ
-35
10
100
-80
-100
-120
1k
10k
FREQUENCY (Hz)
100k
-140
-50
1M
FIGURE 45. GAIN vs FREQUENCY VRS+ = 100mV/12V,
VSENSE = 100mV, VOUT = 50mVP-P
0.330
0.310
0.305
0.25
0.23
0.21
0.19
0.295
0.17
0
25
50
75
100
0.15
-50
125
-25
0
TEMPERATURE (°C)
80
120 160 200
FIGURE 49. VOS (µV) DISTRIBUTION AT +25°C, VRS+ = 12V,
QUANTITY: 100
14
25
50
75
TEMPERATURE (°C)
100
125
FIGURE 48. V OUT ERROR (%) vs TEMPERATURE
VOS (µV)
UNITS
FIGURE 47. GAIN ACCURACY (%) vs TEMPERATURE
26
GAIN 101 ADJ
24
Rf = 100k, Rg = 1k
22
V
= 20mV, 100mV
20 SENSE
18
16
14
12
10
8
6
4
2
0
-200 -160 -120 -80 -40 0
40
VOS (µV)
125
0.27
0.300
-25
100
GAIN 20
VRS+ = 12V
0.29
0.3150
0.290
-50
25
50
75
TEMPERATURE (°C)
0.31
VOUT ERROR (%)
GAIN ACCURACY (%)
0.320
0
FIGURE 46. VOS (µV) vs TEMPERATURE
GAIN 20
VSENSE = 20mV, 100mV
VRS+ = 12V
0.325
-25
2800
2600
2400
2200
2000
1800
1600
1400
1200
1000
800
600
400
200
0
-200
-400
GAIN 101 ADJ
Rf = 100k, Rg = 1k
VSENSE = 20mV, 100mV
+125°C
+100°C
-40°C
0
2
4
6
8
+25°C
10 12 14 16 18 20 22 24 26 28
VRS+ (V)
FIGURE 50. VOS vs VRS+
FN6548.5
May 23, 2011
ISL28006
2800
2600
2400
2200
2000
1800
1600
1400
1200
1000
800
600
400
200
0
-200
-400
250
GAIN 101 ADJ
Rf = 100k, Rg = 1k
VSENSE = 20mV, 100mV
150
+125°C
100
+25°C
-40°C
GAIN 101 ADJ
Rf = 100k, Rg = 1k
VSENSE = 2mV, 20mV
200
VOS (µV)
VOS (µV)
Typical Performance Curves VCC = 12V, RL = 1MΩ, unless otherwise specified. (Continued)
+100°C
50
+25°C
0
-50
-100
+100°C
-40°C
-150
-200
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
+125°C
-250
2
2.0
4
6
8
VRS+ (V)
FIGURE 51. VOS vs VRS+
+100°C
2000
+25°C
FIGURE 52. VOS vs VCC, HIGH-SIDE
1000
VOS (µV)
0.6
GAIN 101 ADJ
Rf = 100k, Rg = 1k
VSENSE = 2mV, 20mV
-40°C
+125°C
0
0.4
-1000
+125°C
+100°C
0.2
ACCURACY (%)
3000
10 12 14 16 18 20 22 24 26 28
VCC (V)
GAIN 101 ADJ
Rf = 100k, Rg = 1k
VSENSE = 20mV, 100mV
0
-0.2
+25°C
-0.4
-40°C
-0.6
-0.8
-1.0
-2000
-1.2
-3000
2
4
6
8
-1.4
10 12 14 16 18 20 22 24 26 28
VCC (V)
FIGURE 53. VOS vs VCC, LOW-SIDE
0.6
0
+100°C
+125°C
ACCURACY (%)
ACCURACY (%)
0.2
-0.2
-0.4
-0.6
+25°C
-40°C
-0.8
-1.0
-1.2
-1.4
0
0.2
0.4
0.6
0.8 1.0 1.2
VRS+ (V)
1.4
1.6
1.8
FIGURE 55. GAIN ACCURACY vs VRS+ = 0V TO 2V
15
2
4
6
8
10 12 14 16 18 20 22 24 26 28
VRS+ (V)
FIGURE 54. GAIN ACCURACY vs VRS+ = 0V TO 28V
GAIN 101 ADJ
Rf = 100k, Rg = 1k
VSENSE = 20mV, 100mV
0.4
0
2.0
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
-3.5
-4.0
-4.5
-5.0
-40°C
+100°C
+25°C
GAIN 101 ADJ
Rf = 100k, Rg = 1k
VSENSE = 2mV, 20mV
+125°C
2
4
6
8
10 12 14 16 18 20 22 24 26 28
VCC (V)
FIGURE 56. GAIN ACCURACY vs VCC, VRS+ = 12V
FN6548.5
May 23, 2011
ISL28006
Typical Performance Curves VCC = 12V, RL = 1MΩ, unless otherwise specified. (Continued)
0.2
0.0
2
ACCURACY (%)
-2
+100°C +25°C -40°C
-4
-6
-8
+125°C
-10
-12
-14
GAIN 101 ADJ
Rf = 100k, Rg = 1k
VSENSE = 2mV, 20mV
-16
-18
-20
2
4
6
8
VOA PERCENT ACCURACY (%)
0
10 12 14 16 18 20 22 24 26 28
+25°C
-0.2
-40°C
-0.4
-0.6 GAIN 101 ADJ
R = 100k
-0.8 Rf = 1k
g
-1.0
0.2
0.0
-0.2
-0.4
-0.6 GAIN 21 ADJ
-0.8 Rf = 100k
R = 5k
-1.0 g
1µ
10µ
+100°C
+125°C
+25°C
-40°C
+100°C
+125°C
100µ
IOUT(A)
VCC (V)
FIGURE 57. GAIN ACCURACY vs VCC, VRS+ = 0.1V
45
GAIN (dB)
30
VRS+ = 0.1V GAIN = 21
VRS+ = 12V GAIN = 21
0
-50
GAIN = 21
-100
-150
GAIN = 101
-200
-250
-300
-350
-50
1M
FIGURE 59. GAIN vs FREQUENCY VRS+ = 100mV/12V,
VSENSE = 100mV, VOUT = 50mVP-P
-25
0
25
50
75
TEMPERATURE (°C)
100
125
FIGURE 60. VOS (µV) vs TEMPERATURE
0.6
0.40
0.5
0.35
GAIN = 101
0.30
VOUT ERROR (%)
GAIN ACCURACY (%)
GAIN = 21, 101
Rf = 100k
Rg = 1k, 5k
RL = 1MΩ
50
10 GAIN = 21, 51, 101
Rf = 100k
5 Rg = 1k, 2k, 5k
VRS+ = 12V GAIN = 51
RL = 1MΩ
0
100
1k
10k
100k
FREQUENCY (Hz)
0.25
0.20
0.15
VRS+ = 12V
100
VRS+ = 12V GAIN = 51
VCC = 12V
15 VSENSE = 100mV
VSENSE = 20mV, 100mV
150
VRS+ = 0.1V GAIN = 101
25
20
200
VOS (µV)
35
10m
FIGURE 58. NORMALIZED VOA vs IOUT
VRS+ = 12V GAIN = 101
40
1m
VSENSE = 20mV, 100mV
VRS+ = 12V
0.10 GAIN = 21, 101
Rf = 100k
0.05 Rg = 1k, 5k
RL = 1MΩ
0
-50
-25
0
GAIN = 21
25
50
75
100
TEMPERATURE (°C)
FIGURE 61. GAIN ACCURACY (%) vs TEMPERATURE
16
125
0.4
GAIN = 101
0.3
0.2
0.1
VSENSE = 20mV, 100mV
VRS+ = 12V
0 GAIN = 21, 101
Rf = 100k
-0.1 Rg = 1k, 5k
RL = 1MΩ
-0.2
-50
-25
0
GAIN = 21
25
50
75
100
125
TEMPERATURE (°C)
FIGURE 62. V OUT ERROR (%) vs TEMPERATURE
FN6548.5
May 23, 2011
ISL28006
Test Circuits and Waveforms
VCC
VR1
VCC
R1
+
+
VRS+
VSENSE
RS+
+
VSENSE
VRS+
GND
-
1MΩ
RS+
+
OUT
RS-
-
-
RL VOUT
R2
OUT
RSGND
1MΩ
RL VOUT
VR2
FIGURE 63. IS, VOS, VOA, CMRR, PSRR, GAIN ACCURACY
FIGURE 64. INPUT BIAS CURRENT, LEAKAGE CURRENT
SIGNAL
GENERATOR
VCC
RS+
RS+
OUT
RS-
VRS+
GND
1MΩ
VRS-
VCC
VSENSE
VRS+
OUT
RSGND
RL VOUT
1MΩ
RL VOUT
PULSE GENERATOR
FIGURE 65. ts, SATURATION RECOVERY TIME
FIGURE 66. GAIN vs FREQUENCY
VCC
RS+
OUT
RS-
VRS+
GND
1MΩ
RL
VOUT
PULSE
GENERATOR
FIGURE 67. SLEW RATE
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.
17
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.
V OUT = GAIN × ( I S R S + V OS )
(EQ. 1)
The transfer function for the adjustable gain part is given in
Equation 2.
RF⎞
⎛
V OUT = ⎜ 1 + -------⎟ ( I S R S + V OS )
R
⎝
G⎠
(EQ. 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.
FN6548.5
May 23, 2011
ISL28006
VCC
OPTIONAL
FILTER
CAPACITOR
I = 2.86µA
VSENSE
IS
RS+
+
R1
VSENSE
RS
HIGH-SIDE
SENSING
VRS+ = 2V TO 28V
gmHI
-
VCC = 2V to 28V
RSR2
+
OPTIONAL
TRANSIENT
PROTECTION
OUT
-
1.35V
Rf
ADJ
OPTION
ONLY
FB
R3
gmLO
‘VSENSE
Rg
R5
IMIRROR
LOAD
R4
GND
FIGURE 68. HIGH-SIDE CURRENT DETECTION
VCC
OPTIONAL
FILTER
CAPACITOR
I = 2.86µA
VSENSE
IS
RS+
+
R1
RS
VSENSE
LOW-SIDE
SENSING
VRS+= 0V TO 2V
gmHI
-
VCC = 2V TO 28V
RSR2
LOAD
+
OPTIONAL
TRANSIENT
PROTECTION
1.35V
R3
-
VCC
OUT
Rf
FB
gmLO
IMIRROR
R5
Rg
ADJ
OPTION
ONLY
‘VSENSE
R4
GND
FIGURE 69. LOW-SIDE CURRENT DETECTION
18
FN6548.5
May 23, 2011
ISL28006
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.
0.5
0.4
ACCURACY (%)
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
( ( R P × I RS- ) = ( 100Ω × 130nA ) = 13μV )
(EQ. 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
-0.4
-0.5
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:
0
0.2
0.4
0.6
0.8 1.0 1.2
VRS+ (V)
1.4
1.6
1.8
2.0
The Kelvin Connected Sense Resistor
FIGURE 70. GAIN ACCURACY vs VRS+ = 0V TO 2V
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
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.
CURRENT
RESISTOR
Current SENSE
Sense Resistor
CURRENT
Current InIN
1mΩ
10mΩ
1 toTO
10mO
Non-uniform
NON-UNIFORM
CURRENT
FLOW
Current Flow
Copper
Trace TRACE
1/2
Oz COPPER
1mΩ /SQ
30mO/Sq.
CURRENT OUT
Current Out
PC
PC BOARD
Board
KELVIN
CONTACTS
Kelvin VVSContacts
S
FIGURE 71. PC BOARD CURRENT SENSE KELVIN CONNECTION
19
FN6548.5
May 23, 2011
ISL28006
2.7VDC
TO
28VDC
VCC
I = 2.86µA
RS+
(1mΩ
RS TO
0.1Ω)
FIXED GAIN
OPTION
ONLY
gmHI
CD
RS-
CM
+
RP
+
-
OUT
-
1.35V
0.1VDC
TO
28VDC
FB
ADJ
OPTION
ONLY
gmLO
LOAD
GND
FIGURE 72. TYPICAL APPLICATION CIRCUIT
Overall Accuracy (VOA %)
where:
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.
• PDMAXTOTAL is the sum of the maximum power dissipation of
each amplifier in the package (PDMAX)
⎛ V OUT actual – V OUT exp ected⎞
V OA = 100 × ⎜ ------------------------------------------------------------------------------⎟
V OUT exp ected
⎝
⎠
(EQ. 4)
• PDMAX for each amplifier can be calculated using Equation 7:
V OUTMAX
PD MAX = V S × I qMAX + ( V S - V OUTMAX ) × -----------------------RL
(EQ. 7)
where:
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.
10.1 – 10
V OA = 100 × ⎛ -------------------------⎞ = 1%
⎝
10 ⎠
(EQ. 5)
• TMAX = Maximum ambient temperature
• θJA = Thermal resistance of the package
• PDMAX = Maximum power dissipation of 1 amplifier
• VCC = Total supply voltage
• IqMAX = Maximum quiescent supply current of 1 amplifier
Power Dissipation
• VOUTMAX = Maximum output voltage swing of the application
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:
• RL = Load resistance
T JMAX = T MAX + θ JA xPD MAXTOTAL
20
(EQ. 6)
FN6548.5
May 23, 2011
ISL28006
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
4/12/11
9/2/10
5/12/10
REVISION
CHANGE
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.
FN6548.4 Added -T7A tape and reel options to Ordering Information Table for all packages.
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
21
FN6548.5
May 23, 2011
ISL28006
Products
Intersil Corporation is a leader in the design and manufacture of high-performance analog semiconductors. The Company's products
address some of the industry's fastest growing markets, such as, flat panel displays, cell phones, handheld products, and notebooks.
Intersil's product families address power management and analog signal processing functions. Go to www.intersil.com/products for a
complete list of Intersil product families.
*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
For additional products, see www.intersil.com/product_tree
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
22
FN6548.5
May 23, 2011
ISL28006
Package Outline Drawing
P5.064A
5 LEAD SMALL OUTLINE TRANSISTOR PLASTIC PACKAGE
Rev 0, 2/10
1.90
0-3°
D
A
0.08-0.20
5
4
PIN 1
INDEX AREA
2.80
3
1.60
3
0.15 C D
2x
2
5
(0.60)
0.20 C
2x
0.95
SEE DETAIL X
B
0.40 ±0.05
3
END VIEW
0.20 M C A-B D
TOP VIEW
10° TYP
(2 PLCS)
2.90
5
H
0.15 C A-B
2x
C
1.45 MAX
1.14 ±0.15
0.10 C
SIDE VIEW
SEATING PLANE
(0.25) GAUGE
PLANE
0.45±0.1
0.05-0.15
4
DETAIL "X"
(0.60)
(1.20)
NOTES:
(2.40)
1.
Dimensions are in millimeters.
Dimensions in ( ) for Reference Only.
2.
Dimensioning and tolerancing conform to ASME Y14.5M-1994.
3.
Dimension is exclusive of mold flash, protrusions or gate burrs.
4.
Foot length is measured at reference to guage plane.
5.
This dimension is measured at Datum “H”.
6.
Package conforms to JEDEC MO-178AA.
(0.95)
(1.90)
TYPICAL RECOMMENDED LAND PATTERN
23
FN6548.5
May 23, 2011
ISL28006
Package Outline Drawing
P6.064
6 LEAD SMALL OUTLINE TRANSISTOR PLASTIC PACKAGE
Rev 4, 2/10
0-8°
1.90
0.95
0.08-0.22
D
A
6
5
4
2.80
PIN 1
INDEX AREA
1.60 +0.15/-0.10
3
3
(0.60)
1
2
3
0.20 C
2x
0.40 ±0.10
B
SEE DETAIL X
3
0.20 M C A-B D
END VIEW
TOP VIEW
10° TYP
(2 PLCS)
2.90 ±0.10
3
1.15 +0.15/-0.25
C
0.10 C
SEATING PLANE
0.00-0.15
SIDE VIEW
(0.25)
GAUGE
PLANE
1.45 MAX
DETAIL "X"
0.45±0.1
4
(0.95)
(0.60)
(1.20)
(2.40)
NOTES:
1.
Dimensions are in millimeters.
Dimensions in ( ) for Reference Only.
2.
Dimensioning and tolerancing conform to ASME Y14.5M-1994.
3.
Dimension is exclusive of mold flash, protrusions or gate burrs.
4.
Foot length is measured at reference to guage plane.
5.
Package conforms to JEDEC MO-178AB.
TYPICAL RECOMMENDED LAND PATTERN
24
FN6548.5
May 23, 2011

Open as PDF

Similar pages