DATASHEET
ISL21080
FN6934
Rev.7.00
Sep 28, 2018
300nA NanoPower Voltage References
Features
The ISL21080 analog voltage references feature low supply
voltage operation at ultra-low 310nA typical, 1.5µA maximum
operating current. Additionally, the ISL21080 family features
ensured initial accuracy as low as ±0.2% and 50ppm/°C
temperature coefficient.
• Reference output voltage . . . . . . . . 0.900V, 1.024V, 1.250V,
1.500V, 2.048V, 2.500V, 3.000V, 3.300V, 4.096V, 5.000V
• Initial accuracy:
These references are ideal for general purpose portable
applications to extend battery life at lower cost. The ISL21080
is provided in the industry standard 3 Ld SOT-23 pinout.
-
The ISL21080 output voltages can be used as precision
voltage sources for voltage monitors, control loops, standby
voltages for low power states for DSP, FPGA, Datapath
Controllers, microcontrollers, and other core voltages: 0.9V,
1.024V, 1.25V, 1.5V, 2.048V, 2.5V, 3.0V, 3.3V, 4.096V, and
5.0V.
ISL21080-09 and -10 . . . . . . . . . . . . . . . . . . . . . . . . .
ISL21080-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ISL21080-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ISL21080-20 and -25 . . . . . . . . . . . . . . . . . . . . . . . . .
ISL21080-30, -33, -41, and -50 . . . . . . . . . . . . . . . . .
• Input voltage range:
- ISL21080-09 . . . . . . . . . . . . . . . . . . . . . . . . . . .
- ISL21080-10, -12, -15, -20 and -25. . . . . . . . .
- ISL21080-30 . . . . . . . . . . . . . . . . . . . . . . . . . . .
- ISL21080-33 . . . . . . . . . . . . . . . . . . . . . . . . . . .
- ISL21080-41. . . . . . . . . . . . . . . . . . . . . . . . . . . .
- ISL21080-50 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Special Note: Post-assembly X-ray inspection may lead to permanent
changes in device output voltage and should be minimized or
avoided. For further information, see “Applications Information” on
page 15 and AN1533, “X-Ray Effects on Intersil FGA References”.
Applications
±0.7%
±0.6%
±0.5%
±0.3%
±0.2%
2.0V to 5.5V
2.7V to 5.5V
3.2V to 5.5V
3.5V to 5.5V
4.5V to 8.0V
5.5V to 8.0V
• Output voltage noise . . . . . . . . . . . . .30µVP-P (0.1Hz to 10Hz)
• Energy harvesting applications
• Supply current . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5µA (max)
• Wireless sensor network applications
• Tempco . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50ppm/°C
• Low power voltage sources for controllers, FPGA, ASICs, or
logic devices
• Output current capability . . . . . . . . . . . . . . . . . . . . . . . . ±7mA
• Battery management/monitoring
• Operating temperature range. . . . . . . . . . . . . -40°C to +85°C
• Low power standby voltages
• Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Ld SOT-23
• Portable Instrumentation
• Pb-Free (RoHS compliant)
• Consumer/medical electronics
• Wearable electronics
Related Literature
• Lower cost industrial and instrumentation
For a full list of related documents, visit our website:
• Power regulation circuits
• ISL21080 family product page
• Control loops and compensation networks
• LED/diode supply
500
UNIT 1
400
UNIT 2
IN (nA)
300
UNIT 3
200
100
0
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
VIN (V)
FIGURE 1. IIN vs VIN, THREE UNITS
FN6934 Rev.7.00
Sep 28, 2018
Page 1 of 23
ISL21080
Pin Configuration
Pin Descriptions
3 LD SOT-23
TOP VIEW
PIN NUMBER
PIN NAME
1
VIN
Input Voltage Connection
2
VOUT
Voltage Reference Output
3
GND
Ground Connection
VIN 1
3
GND
DESCRIPTION
VOUT 2
Ordering Information
PART NUMBER
(Notes 2, 3)
PART
MARKING
(Note 4)
VOUT OPTION
(V)
GRADE
(%)
TEMP. RANGE
(°C)
TAPE AND REEL
(UNITS) (Note 1)
PACKAGE
(RoHS Compliant)
PKG.
DWG. #
ISL21080DIH309Z-TK
BCLA
0.9
±0.7
-40 to +85
1k
3 Ld SOT-23
P3.064A
ISL21080DIH310Z-TK
BCMA
1.024
±0.7
-40 to +85
1k
3 Ld SOT-23
P3.064A
ISL21080DIH312Z-TK
BCNA
1.25
±0.6
-40 to +85
1k
3 Ld SOT-23
P3.064A
ISL21080CIH315Z-TK
BCDA
1.5
±0.5
-40 to +85
1k
3 Ld SOT-23
P3.064A
ISL21080CIH315Z-T7A
BCDA
1.5
±0.5
-40 to +85
250
3 Ld SOT-23
P3.064A
ISL21080CIH320Z-TK
BCPA
2.048
±0.3
-40 to +85
1k
3 Ld SOT-23
P3.064A
ISL21080CIH325Z-TK
BCRA
2.5
±0.3
-40 to +85
1k
3 Ld SOT-23
P3.064A
ISL21080CIH330Z-TK
BCSA
3.0
±0.2
-40 to +85
1k
3 Ld SOT-23
P3.064A
ISL21080CIH333Z-TK
BCTA
3.3
±0.2
-40 to +85
1k
3 Ld SOT-23
P3.064A
ISL21080CIH341Z-TK
BCVA
4.096
±0.2
-40 to +85
1k
3 Ld SOT-23
P3.064A
ISL21080CIH350Z-TK
BCWA
5.0
±0.2
-40 to +85
1k
3 Ld SOT-23
P3.064A
ISL2108009EV1Z
ISL21080DIH309Z Evaluation Board
ISL2108010EV1Z
ISL21080DIH310Z Evaluation Board
ISL2108012EV1Z
ISL21080DIH312Z Evaluation Board
ISL2108015EV1Z
ISL21080DIH315Z Evaluation Board
ISL2108020EV1Z
ISL21080DIH320Z Evaluation Board
ISL2108025EV1Z
ISL21080DIH325Z Evaluation Board
ISL2108030EV1Z
ISL21080DIH330Z Evaluation Board
ISL2108033EV1Z
ISL21080DIH333Z Evaluation Board
ISL2108040EV1Z
ISL21080DIH341Z Evaluation Board
ISL2108050EV1Z
ISL21080DIH350Z Evaluation Board
NOTES:
1. Refer to TB347 for details about reel specifications.
2. These 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). 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), refer to the ISL21080DIH309, ISL21080DIH310, ISL21080DIH312, ISL21080CIH315, ISL21080CIH320,
ISL21080CIH325, ISL21080CIH330, ISL21080CIH333, ISL21080CIH341, and ISL21080CIH350 product information pages. For more information
about MSL, see TB363.
4. The part marking is located on the bottom of the part.
FN6934 Rev.7.00
Sep 28, 2018
Page 2 of 23
ISL21080
Absolute Maximum Ratings
Thermal Information
Max Voltage
VIN to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +6.5V
VIN to GND (ISL21080-41 and 50 only) . . . . . . . . . . . . . . . -0.5V to +10V
VOUT to GND (10s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to VOUT +1V
VOUT to GND (10s)
ISL21080-41 and 50 only . . . . . . . . . . . . . . . . . . . . . . -0.5V to +5.1V
ESD Ratings
Human Body Model (Tested to JESD22-A114) . . . . . . . . . . . . . . . . . . 5kV
Machine Model (Tested to JESD22-A115) . . . . . . . . . . . . . . . . . . . . . 500V
Charged Device Model (Tested to JESD22-C101) . . . . . . . . . . . . . . . . 2kV
Latch-Up (Tested per JESD-78B; Class 2, Level A) . . . . . . . . . . . . . . 100mA
Thermal Resistance (Typical)
JA (°C/W)
JC (°C/W)
3 Lead SOT-23 (Notes 6, 7) . . . . . . . . . . . . . .
275
110
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . .+107°C
Continuous Power Dissipation (TA = +85°C) . . . . . . . . . . . . . . . . . . . 99mW
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493
Recommended Operating Conditions
Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.5V
Environmental Operating Conditions
X-Ray Exposure (Note 5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mRem
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. Measured with no filtering, distance of 10” from source, intensity set to 55kV and 70µA current, 30s duration. Other exposure levels should be
analyzed for Output Voltage drift effects. See “Applications Information” on page 15.
6. JA is measured with the component mounted on a high-effective thermal conductivity test board in free air. See TB379 for details.
7. For JC, the “case temp” location is taken at the package top center.
Electrical Specifications (ISL21080-09, VOUT = 0.9V)
VIN = 3.0V, TA = -40°C to +85°C, IOUT = 0, unless otherwise
specified. Boldface limits apply over the operating temperature range, -40°C to +85°C.
PARAMETER
SYMBOL
Output Voltage
VOUT
VOUT Accuracy at TA = +25°C (Notes 8, 9)
VOA
Output Voltage Temperature Coefficient
(Note 10)
TC VOUT
CONDITIONS
MIN
(Note 13)
TYP
MAX
(Note 13)
0.9
-0.7
UNIT
V
+0.7
%
50
ppm/°C
5.5
V
0.35
1.5
µA
Input Voltage Range
VIN
Supply Current
IIN
Line Regulation
VOUT /VIN
2V ≤ VIN ≤ 5.5V
30
350
µV/V
Load Regulation
VOUT/IOUT
Sourcing: 0mA ≤ IOUT ≤ 10mA
6
100
µV/mA
Sinking: -10mA ≤ IOUT≤ 0mA
23
350
µV/mA
2.0
Short-Circuit Current
ISC
TA = +25°C, VOUT tied to GND
30
mA
Turn-On Settling Time
tR
VOUT = ±0.1% with no load
1
ms
f = 120Hz
-40
dB
Ripple Rejection
Output Voltage Noise
eN
0.1Hz ≤ f ≤10Hz
40
µVP-P
Broadband Voltage Noise
VN
10Hz ≤ f ≤1kHz
10
µVRMS
f = 1kHz
1.1
µV/Hz
TA = +125°C
100
ppm
TA = +25°C
60
ppm
Noise Density
Thermal Hysteresis (Note 11)
VOUT/TA
Long Term Stability (Note 12)
VOUT/t
FN6934 Rev.7.00
Sep 28, 2018
Page 3 of 23
ISL21080
Electrical Specifications (ISL21080-10, VOUT = 1.024V)
specified. Boldface limits apply over the operating temperature range, -40°C to +85°C.
PARAMETER
SYMBOL
Output Voltage
VOUT
VOUT Accuracy at TA = +25°C (Notes 8, 9)
VOA
Output Voltage Temperature Coefficient
(Note 10)
TC VOUT
Input Voltage Range
VIN = 3.0V, TA = -40°C to +85°C, IOUT = 0, unless otherwise
MIN
(Note 13)
CONDITIONS
TYP
MAX
(Note 13)
1.024
-0.7
2.7
VIN
UNIT
V
+0.7
%
50
ppm/°C
5.5
V
Supply Current
IIN
0.31
1.5
µA
Line Regulation
VOUT /VIN
2.7V ≤ VIN ≤ 5.5V
80
350
µV/V
Load Regulation
VOUT/IOUT
Sourcing: 0mA ≤ IOUT ≤ 7mA
25
100
µV/mA
Sinking: -7mA ≤ IOUT≤ 0mA
50
350
µV/mA
Short-Circuit Current
ISC
TA = +25°C, VOUT tied to GND
50
mA
Turn-On Settling Time
tR
VOUT = ±0.1% with no load
4
ms
f = 120Hz
-40
dB
Output Voltage Noise
eN
0.1Hz ≤ f ≤10Hz
30
µVP-P
Broadband Voltage Noise
VN
10Hz ≤ f ≤1kHz
52
µVRMS
f = 1kHz
2.2
µV/Hz
TA = +165°C
100
ppm
TA = +25°C
50
ppm
Ripple Rejection
Noise Density
Thermal Hysteresis (Note 11)
VOUT/TA
Long Term Stability (Note 12)
VOUT/t
Electrical Specifications (ISL21080-12, VOUT = 1.25V)
specified. Boldface limits apply over the operating temperature range, -40°C to +85°C.
PARAMETER
SYMBOL
Output Voltage
VOUT
VOUT Accuracy at TA = +25°C (Notes 8, 9)
VOA
Output Voltage Temperature Coefficient
(Note 10)
TC VOUT
VIN = 3.0V, TA = -40°C to +85°C, IOUT = 0, unless otherwise
CONDITIONS
MIN
(Note 13)
TYP
MAX
(Note 13)
1.25
-0.6
UNIT
V
+0.6
%
50
ppm/°C
5.5
V
0.31
1.5
µA
2.7
Input Voltage Range
VIN
Supply Current
IIN
Line Regulation
VOUT /VIN
2.7V ≤ VIN ≤ 5.5V
80
350
µV/V
Load Regulation
VOUT/IOUT
Sourcing: 0mA ≤ IOUT ≤ 7mA
25
100
µV/mA
Sinking: -7mA ≤ IOUT≤ 0mA
50
350
µV/mA
Short-Circuit Current
ISC
TA = +25°C, VOUT tied to GND
50
mA
Turn-On Settling Time
tR
VOUT = ±0.1% with no load
4
ms
f = 120Hz
-40
dB
Ripple Rejection
Output Voltage Noise
eN
0.1Hz ≤ f ≤10Hz
30
µVP-P
Broadband Voltage Noise
VN
10Hz ≤ f ≤1kHz
52
µVRMS
f = 1kHz
1.1
µV/Hz
TA = +165°C
100
ppm
TA = +25°C
50
ppm
Noise Density
Thermal Hysteresis (Note 11)
VOUT/TA
Long Term Stability (Note 12)
VOUT/t
FN6934 Rev.7.00
Sep 28, 2018
Page 4 of 23
ISL21080
Electrical Specifications (ISL21080-15, VOUT = 1.5V)
VIN = 3.0V, TA = -40°C to +85°C, IOUT = 0, unless otherwise
specified. Boldface limits apply over the operating temperature range, -40°C to +85°C.
PARAMETER
SYMBOL
Output Voltage
VOUT
VOUT Accuracy at TA = +25°C (Notes 8, 9)
VOA
Output Voltage Temperature Coefficient
(Note 10)
TC VOUT
Input Voltage Range
MIN
(Note 13)
CONDITIONS
TYP
MAX
(Note 13)
1.5
-0.5
2.7
VIN
UNIT
V
+0.5
%
50
ppm/°C
5.5
V
Supply Current
IIN
0.31
1.5
µA
Line Regulation
VOUT /VIN
2.7V ≤ VIN ≤ 5.5V
80
350
µV/V
Load Regulation
VOUT/IOUT
Sourcing: 0mA ≤ IOUT ≤ 7mA
10
100
µV/mA
Sinking: -7mA ≤ IOUT≤ 0mA
50
350
µV/mA
Short-Circuit Current
ISC
TA = +25°C, VOUT tied to GND
50
mA
Turn-On Settling Time
tR
VOUT = ±0.1% with no load
4
ms
f = 120Hz
-40
dB
Output Voltage Noise
eN
0.1Hz ≤ f ≤10Hz
30
µVP-P
Broadband Voltage Noise
VN
10Hz ≤ f ≤1kHz
52
µVRMS
Ripple Rejection
Noise Density
Thermal Hysteresis (Note 11)
VOUT/TA
Long Term Stability (Note 12)
VOUT/t
f = 1kHz
1.1
µV/Hz
TA = +165°C
100
ppm
TA = +25°C
50
ppm
Electrical Specifications (ISL21080-20, VOUT = 2.048V)
d
specified. Boldface limits apply over the operating temperature range, -40°C to +85°C.
PARAMETER
SYMBOL
Output Voltage
VOUT
VOUT Accuracy at TA = +25°C (Notes 8, 9)
VOA
Output Voltage Temperature Coefficient
(Note 10)
TC VOUT
VIN = 3.0V, TA = -40°C to +85°C, IOUT = 0, unless otherwise
CONDITIONS
MIN
(Note 13)
TYP
MAX
(Note 13)
2.048
-0.3
UNIT
V
+0.3
%
50
ppm/°C
5.5
V
0.31
1.5
µA
2.7
Input Voltage Range
VIN
Supply Current
IIN
Line Regulation
VOUT /VIN
2.7V ≤ VIN ≤ 5.5V
80
350
µV/V
Load Regulation
VOUT/IOUT
Sourcing: 0mA ≤ IOUT ≤ 7mA
25
100
µV/mA
Sinking: -7mA ≤ IOUT≤ 0mA
50
350
µV/mA
Short-Circuit Current
ISC
TA = +25°C, VOUT tied to GND
50
mA
Turn-On Settling Time
tR
VOUT = ±0.1% with no load
4
ms
f = 120Hz
-40
dB
Ripple Rejection
Output Voltage Noise
eN
0.1Hz ≤ f ≤10Hz
30
µVP-P
Broadband Voltage Noise
VN
10Hz ≤ f ≤1kHz
52
µVRMS
f = 1kHz
1.1
µV/Hz
TA = +165°C
100
ppm
TA = +25°C
50
ppm
Noise Density
Thermal Hysteresis (Note 11)
VOUT/TA
Long Term Stability (Note 12)
VOUT/t
FN6934 Rev.7.00
Sep 28, 2018
Page 5 of 23
ISL21080
Electrical Specifications (ISL21080-25, VOUT = 2.5V)
specified. Boldface limits apply over the operating temperature range, -40°C to +85°C.
PARAMETER
SYMBOL
Output Voltage
VOUT
VOUT Accuracy at TA = +25°C (Notes 8, 9)
VOA
Output Voltage Temperature Coefficient
(Note 10)
TC VOUT
VIN = 3.0V, TA = -40°C to +85°C, IOUT = 0, unless otherwise
CONDITIONS
MIN
(Note 13)
MAX
(Note 13)
UNIT
+0.3
%
50
ppm/°C
5.5
V
0.31
1.5
µA
TYP
2.5
-0.3
2.7
V
Input Voltage Range
VIN
Supply Current
IIN
Line Regulation
VOUT /VIN
2.7V ≤ VIN ≤ 5.5V
80
350
µV/V
Load Regulation
VOUT/IOUT
Sourcing: 0mA ≤ IOUT ≤ 7mA
25
100
µV/mA
Sinking: -7mA ≤ IOUT≤ 0mA
50
350
µV/mA
Short-Circuit Current
ISC
TA = +25°C, VOUT tied to GND
50
mA
Turn-On Settling Time
tR
VOUT = ±0.1% with no load
4
ms
f = 120Hz
-40
dB
Ripple Rejection
Output Voltage Noise
eN
0.1Hz ≤ f ≤10Hz
30
µVP-P
Broadband Voltage Noise
VN
10Hz ≤ f ≤1kHz
52
µVRMS
f = 1kHz
1.1
µV/Hz
TA = +165°C
100
ppm
TA = +25°C
50
ppm
Noise Density
Thermal Hysteresis (Note 11)
VOUT/TA
Long Term Stability (Note 12)
VOUT/t
Electrical Specifications (ISL21080-30, VOUT = 3.0V)
specified. Boldface limits apply over the operating temperature range, -40°C to +85°C.
PARAMETER
SYMBOL
Output Voltage
VOUT
VOUT Accuracy at TA = +25°C (Notes 8, 9)
VOA
Output Voltage Temperature Coefficient
(Note 10)
TC VOUT
VIN = 5.0V, TA = -40°C to +85°C, IOUT = 0, unless otherwise
CONDITIONS
MIN
(Note 13)
TYP
MAX
(Note 13)
3.0
-0.2
UNIT
V
+0.2
%
50
ppm/°C
5.5
V
0.31
1.5
µA
Input Voltage Range
VIN
Supply Current
IIN
Line Regulation
VOUT /VIN
3.2V ≤ VIN ≤ 5.5V
80
350
µV/V
Load Regulation
VOUT/IOUT
Sourcing: 0mA ≤ IOUT ≤ 7mA
25
100
µV/mA
Sinking: -7mA ≤ IOUT≤ 0mA
50
350
µV/mA
3.2
Short-Circuit Current
ISC
TA = +25°C, VOUT tied to GND
50
mA
Turn-On Settling Time
tR
VOUT = ±0.1% with no load
4
ms
f = 120Hz
-40
dB
Ripple Rejection
Output Voltage Noise
eN
0.1Hz ≤ f ≤10Hz
30
µVP-P
Broadband Voltage Noise
VN
10Hz ≤ f ≤1kHz
52
µVRMS
f = 1kHz
1.1
µV/Hz
TA = +165°C
100
ppm
TA = +25°C
50
ppm
Noise Density
Thermal Hysteresis (Note 11)
VOUT/TA
Long Term Stability (Note 12)
VOUT/t
FN6934 Rev.7.00
Sep 28, 2018
Page 6 of 23
ISL21080
Electrical Specifications (ISL21080-33, VOUT = 3.3V)
VIN = 5.0V, TA = -40°C to +85°C, IOUT = 0, unless otherwise
specified. Boldface limits apply over the operating temperature range, -40°C to +85°C.
PARAMETER
SYMBOL
Output Voltage
VOUT
VOUT Accuracy at TA = +25°C (Notes 8, 9)
VOA
Output Voltage Temperature Coefficient
(Note 10)
TC VOUT
CONDITIONS
MIN
(Note 13)
TYP
MAX
(Note 13)
3.3
-0.2
UNIT
V
+0.2
%
50
ppm/°C
5.5
V
0.31
1.5
µA
Input Voltage Range
VIN
Supply Current
IIN
Line Regulation
VOUT /VIN
3.5 V ≤ VIN ≤ 5.5V
80
350
µV/V
Load Regulation
VOUT/IOUT
Sourcing: 0mA ≤ IOUT ≤ 10mA
25
100
µV/mA
Sinking: -10mA ≤ IOUT≤ 0mA
50
350
µV/mA
3.5
Short-Circuit Current
ISC
TA = +25°C, VOUT tied to GND
50
mA
Turn-On Settling Time
tR
VOUT = ±0.1% with no load
4
ms
f = 120Hz
-40
dB
Ripple Rejection
Output Voltage Noise
eN
0.1Hz ≤ f ≤10Hz
30
µVP-P
Broadband Voltage Noise
VN
10Hz ≤ f ≤1kHz
52
µVRMS
f = 1kHz
1.1
µV/Hz
TA = +165°C
100
ppm
TA = +25°C
50
ppm
Noise Density
Thermal Hysteresis (Note 11)
VOUT/TA
Long Term Stability (Note 12)
VOUT/t
Electrical Specifications (ISL21080-41 VOUT = 4.096V)
specified. Boldface limits apply over the operating temperature range, -40°C to +85°C.
PARAMETER
SYMBOL
Output Voltage
VOUT
VOUT Accuracy at TA = +25°C (Notes 8, 9)
VOA
Output Voltage Temperature Coefficient
(Note 10)
VIN = 5.0V, TA = -40°C to +85°C, IOUT = 0, unless otherwise
CONDITIONS
MIN
(Note 13)
TYP
MAX
(Note 13)
4.096
-0.2
UNIT
V
+0.2
%
50
ppm/°C
8.0
V
0.5
1.5
µA
TC VOUT
4.5
Input Voltage Range
VIN
Supply Current
IIN
Line Regulation
VOUT /VIN
4.5 V ≤ VIN ≤ 8.0V
80
350
µV/V
Load Regulation
VOUT/IOUT
Sourcing: 0mA ≤ IOUT ≤ 10mA
10
100
µV/mA
Sinking: -10mA ≤ IOUT≤ 0mA
20
350
µV/mA
Short-Circuit Current
ISC
TA = +25°C, VOUT tied to GND
80
mA
Turn-On Settling Time
tR
VOUT = ±0.1% with no load
4
ms
f = 120Hz
-40
dB
Ripple Rejection
Output Voltage Noise
eN
0.1Hz ≤ f ≤10Hz
30
µVP-P
Broadband Voltage Noise
VN
10Hz ≤ f ≤1kHz
52
µVRMS
f = 1kHz
1.1
µV/Hz
TA = +165°C
100
ppm
TA = +25°C
50
ppm
Noise Density
Thermal Hysteresis (Note 11)
VOUT/TA
Long Term Stability (Note 12)
VOUT/t
FN6934 Rev.7.00
Sep 28, 2018
Page 7 of 23
ISL21080
Electrical Specifications (ISL21080-50 VOUT = 5.0V)
VIN = 6.5V, TA = -40°C to +85°C, IOUT = 0, unless otherwise
specified. Boldface limits apply over the operating temperature range, -40°C to +85°C.
PARAMETER
SYMBOL
Output Voltage
VOUT
VOUT Accuracy at TA = +25°C (Notes 8, 9)
VOA
Output Voltage Temperature Coefficient
(Note 10)
CONDITIONS
MIN
(Note 13)
TYP
VIN
Supply Current
IIN
UNIT
5.0
-0.2
TC VOUT
Input Voltage Range
MAX
(Note 13)
5.5
0.5
V
+0.2
%
50
ppm/°C
8.0
V
1.5
µA
Line Regulation
VOUT /VIN
5.5 V ≤ VIN ≤ 8.0V
80
350
µV/V
Load Regulation
VOUT/IOUT
Sourcing: 0mA ≤ IOUT ≤ 10mA
10
100
µV/mA
Sinking: -10mA ≤ IOUT≤ 0mA
20
350
µV/mA
80
mA
Short-Circuit Current
ISC
TA = +25°C, VOUT tied to GND
Turn-On Settling Time
tR
VOUT = ±0.1% with no load
Ripple Rejection
4
ms
f = 120Hz
-40
dB
Output Voltage Noise
eN
0.1Hz ≤ f ≤10Hz
30
µVP-P
Broadband Voltage Noise
VN
10Hz ≤ f ≤1kHz
52
µVRMS
Noise Density
Thermal Hysteresis (Note 11)
VOUT/TA
Long Term Stability (Note 12)
VOUT/t
f = 1kHz
1.1
µV/Hz
TA = +165°C
100
ppm
TA = +25°C
50
ppm
NOTES:
8. Post-reflow drift for the ISL21080 devices ranges from 100µV to 1.0mV based on experimental results with devices on FR4 double sided boards. The
design engineer must take this into account when considering the reference voltage after assembly.
9. Post-assembly X-ray inspection may also lead to permanent changes in device output voltage and should be minimized or avoided. Initial accuracy
can change 10mV or more under extreme radiation. Most inspection equipment does not affect the FGA reference voltage, but if X-ray inspection is
required, it is advisable to monitor the reference output voltage to verify excessive shift has not occurred.
10. Over the specified temperature range. Temperature coefficient is measured by the box method whereby the change in VOUT is divided by the
temperature range; in this case, -40°C to +85°C = +125°C.
11. Thermal Hysteresis is the change of VOUT measured at TA = +25°C after temperature cycling over a specified range, TA. VOUT is read initially at
TA = +25°C for the device under test. The device is temperature cycled and a second VOUT measurement is taken at +25°C. The difference between
the initial VOUT reading and the second VOUT reading is then expressed in ppm. For TA = +125°C, the device under test is cycled from +25°C to
+85°C to -40°C to +25°C.
12. Long term drift is logarithmic in nature and diminishes over time. Drift after the first 1000 hours is approximately 10ppm/1khrs.
13. 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.
FN6934 Rev.7.00
Sep 28, 2018
Page 8 of 23
ISL21080
Typical Performance Characteristics Curves VOUT = 0.9V
VIN = 3.0V, IOUT = 0mA,
TA = +25°C unless otherwise specified.
0.6
0.6
0.5
0.5
HIGH
0.4
IIN (µA)
IIN (µA)
0.4
+85°C
0.3
TYP
LOW
0.2
0.3
0.2
0
2.0
2.4
2.8
3.2
3.6
4.0
VIN (V)
4.4
4.8
0
2.0
5.2
0.90020
2.8
3.2
3.6
4.0
VIN (V)
4.4
4.8
5.2
200
LOW
0.90010
HIGH
0.90005
0.90000
0.89995
TYP
0.89990
0.89985
2.4
2.8
3.2
3.6 4.0
VIN (V)
4.4
4.8
150
+85°C
100
VIN = 3.0V
VOUT (µV) NORMALIZED TO
0.90015
0.89980
2.0
2.4
FIGURE 3. IIN vs VIN OVER-TEMPERATURE
FIGURE 2. IIN vs VIN, THREE UNITS
0.9V AT VIN = 3.0V
+25°C
0.1
0.1
VOUT (V) NORMALIZED TO
-40°C
50
0
-50
-150
5.2
FIGURE 4. LINE REGULATION, THREE UNITS
+25°C
-40°C
-100
2.0
2.4
2.8
3.2
3.6
4.0
VIN (V)
4.4
4.8
5.2
FIGURE 5. LINE REGULATION OVER-TEMPERATURE
200
0.9010
0.9005
100
TYP
VOUT (mV)
NORMALIZED TO +25°C
VOUT (V)
150
LOW
0.9000
HIGH
VIN = +0.3V
50
0
-50
VIN = -0.3V
-100
0.8995
-150
0.8990
-40 -30 -20
-10
0
10 20 30 40 50 60 70
TEMPERATURE (°C)
FIGURE 6. VOUT vs TEMPERATURE NORMALIZED to +25°C
FN6934 Rev.7.00
Sep 28, 2018
80
-200
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
TIME (µs)
FIGURE 7. LINE TRANSIENT RESPONSE, WITH CAPACITIVE LOAD
Page 9 of 23
ISL21080
Typical Performance Characteristics Curves VOUT = 0.9V
VIN = 3.0V, IOUT = 0mA,
TA = +25°C unless otherwise specified. (Continued)
200
500
VIN = +0.3V
150
+85°C
100
VOUT (µV)
VOUT (mV)
50
0
-50
0
-40°C
VIN = -0.3V
-100
+25°C
-150
-200
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
-500
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10
5.0
SINKING
TIME (µs)
1000
500
800
400
ILOAD = +7mA
600
VOUT (mV)
VOUT (mV)
200
200
0
-200
100
0
-100
-400
-200
-600
-300
ILOAD = -7mA
-800
0
1
2
3
4
5
6
TIME (ms)
7
8
9
-500
0
10
1
2
3
4
5
6
TIME (ms)
7
8
9
10
FIGURE 11. LOAD TRANSIENT RESPONSE
3.5
1.6
1.4
NO LOAD
3.0
7mA
1.2
2.5
LOW
VOUT (V)
1.0
0.8
0.6
2.0
VDD
TYP
HIGH
1.5
1.0
0.4
0.5
0.2
0
1.0 1.2
ILOAD = -50µA
-400
FIGURE 10. LOAD TRANSIENT RESPONSE
VOUT (V)
ILOAD = +50µA
300
400
-1000
SOURCING
LOAD (mA)
FIGURE 9. LOAD REGULATION OVER-TEMPERATURE
FIGURE 8. LINE TRANSIENT RESPONSE
1.4
1.6
1.8
2.0 2.2
2.4
VIN (V)
FIGURE 12. DROPOUT
FN6934 Rev.7.00
Sep 28, 2018
2.6
2.8
3.0
0
0
0.3
0.6
0.9
TIME (ms)
1.2
1.5
FIGURE 13. TURN-ON TIME
Page 10 of 23
ISL21080
Typical Performance Characteristics Curves VOUT = 1.5V
VIN = 3.0V, IOUT = 0mA, TA
= +25°C unless otherwise specified.
500
500
UNIT 1
400
400
+85°C
300
UNIT 3
IN (nA)
IN (nA)
UNIT 2
200
300
-40°C
200
100
100
0
2.7
3.1
3.5
3.9
4.3
VIN (V)
4.7
5.1
0
2.7
5.5
1.50020
3.5
3.9
4.3
VIN (V)
4.7
5.1
5.5
150
125
VOUT (µV)
(NORMALIZED TO VIN = 3V)
1.50015
1.50010
1.50005
UNIT 2
1.50000
UNIT 1
1.49995
UNIT 3
1.49990
1.49985
1.49980
2.7
3.1
FIGURE 15. IIN vs VIN OVER-TEMPERATURE
FIGURE 14. IIN vs VIN, THREE UNITS
VOUT (V)
(NORMAILIZED TO 1.5V AT VIN = 3V)
+25°C
100
75
50
+25°C
25
+85°C
0
-25
-50
-75
-100
-40°C
-125
3.1
3.5
3.9
4.3
VIN (V)
4.7
5.1
-150
2.7
5.5
FIGURE 16. LINE REGULATION, THREE UNITS
3.1
3.5
3.9
4.3
VIN (V)
4.7
5.1
5.5
FIGURE 17. LINE REGULATION OVER-TEMPERATURE
1.5005
1.5004
C L = 500pF
1.5003
1.5001
UNIT 1
1.5000
1.4999
50mV/DIV
VOUT (V)
V IN = 0.3V
UNIT 2
1.5002
UNIT 3
1.4998
V IN = -0.3V
1.4997
1.4996
1.4995
-40 -30 -20 -10
0
10 20 30 40
VIN (V)
50
60 70
80
FIGURE 18. VOUT vs TEMPERATURE NORMALIZED to +25°C
FN6934 Rev.7.00
Sep 28, 2018
1ms/DIV
FIGURE 19. LINE TRANSIENT RESPONSE, WITH CAPACITIVE LOAD
Page 11 of 23
ISL21080
Typical Performance Characteristics Curves VOUT = 1.5V
VIN = 3.0V, IOUT = 0mA, TA
= +25°C unless otherwise specified. (Continued)
900
C L = 0pF
700
V IN = 0.3V
+25°C
50mV/DIV
VOUT (µV)
500
300
100
0
-40°C
-100
V IN = -0.3V
+85°C
-300
-500
1ms/DIV
-7 -6 -5
-4 -3 -2 -1
SINKING
3
4
5
6
IL = -50A
2ms/DIV
1ms/DIV
FIGURE 23. LOAD TRANSIENT RESPONSE
FIGURE 22. LOAD TRANSIENT RESPONSE
3.5
1.52
NO LOAD
3.0
1.50
2.5
1.48
VOLTAGE (V)
7mA LOAD
1.46
1.44
1.0
1.40
0.5
2.5
3.0
3.5
VIN (V)
4.0
FIGURE 24. DROPOUT
FN6934 Rev.7.00
Sep 28, 2018
4.5
5.0
5.5
UNIT 1
1.5
1.42
2.0
VIN
2.0
0
0
UNIT 3
UNIT 2
0.5
1.0
1.5
2.0 2.5 3.0
TIME (ms)
3.5
7
SOURCING
IL = 50A
IL = -7mA
VOUT (V)
2
FIGURE 21. LOAD REGULATION OVER-TEMPERATURE
IL = 7mA
1.38
1.5
1
100mV/DIV
500mV/DIV
FIGURE 20. LINE TRANSIENT RESPONSE
0
OUTPUT CURRENT
4.0
4.5
5.0
FIGURE 25. TURN-ON TIME
Page 12 of 23
ISL21080
Typical Performance Characteristics Curves VOUT = 1.5V
VIN = 3.0V, IOUT = 0mA, TA
= +25°C unless otherwise specified. (Continued)
200
0
NO LOAD
NO LOAD
180
1nF
-10
160
1nF
-20
120
100
PSRR (dB)
ZOUT (Ω)
140
10nF
80
60
-30
10nF
-40
-50
100nF
40
-60
20
0
100nF
-70
10
100
1k
10k
FREQUENCY (Hz)
100k
1M
10
FIGURE 26. ZOUT vs FREQUENCY, IOUT = 2mA
1.6
1M
TA = +25°C unless otherwise specified.
1.4
1.2
1.2
1.0
1.0
VOUT (V)
VOUT (V)
7mA
0.8
0.6
0.8
0.6
0.4
0.4
0.2
0.2
1.4
1.6
1.8
2.0 2.2
VIN (V)
2.4
2.6
2.8
0
3.0
7mA
NO LOAD
1.3
FIGURE 28. DROPOUT, ISL21080-10
1.5
1.7
1.9
2.1
2.3
VIN (V)
2.5
2.7
2.9
FIGURE 29. DROPOUT, ISL21080-12
3.3
3.0
2.9
NO LOAD
3.2
7mA
2.7
NO LOAD
7mA
3.1
2.6
VOUT (V)
VOUT (V)
100k
1.6
NO LOAD
1.4
2.8
1k
10k
FREQUENCY (Hz)
FIGURE 27. PSRR vs FREQUENCY
Typical Performance Characteristics Curves
0
1.2
100
2.5
2.4
2.3
2.2
3.0
2.9
2.8
2.1
2.0
2.5
2.7
2.9
3.1
VIN (V)
3.3
FIGURE 30. DROPOUT, ISL21080-25
FN6934 Rev.7.00
Sep 28, 2018
3.5
2.7
3.0
3.2
3.4
3.6
3.8
4.0
VIN (V)
FIGURE 31. DROPOUT, ISL21080-30
Page 13 of 23
ISL21080
Typical Performance Characteristics Curves
3.6
4.3
3.5
4.2
NO LOAD
7mA
3.3
7mA
4.0
3.2
3.9
3.1
3.8
3.0
3.3
NO LOAD
4.1
VOUT (V)
VOUT (V)
3.4
TA = +25°C unless otherwise specified. (Continued)
3.5
3.7
3.9
VIN (V)
4.1
4.3
3.7
4.1
4.5
4.3
4.5
4.7
4.9
5.1
VIN (V)
FIGURE 32. DROPOUT, ISL21080-33
FIGURE 33. DROPOUT, ISL21080-41
5.3
5.2
NO LOAD
7mA
VOUT (V)
5.1
5.0
4.9
4.8
4.7
5.0
5.2
5.4
5.6
5.8
6.0
VIN (V)
FIGURE 34. DROPOUT, ISL21080-50
High Current Application
1.502
1.502
VIN = 5V
VIN = 5V
1.500
1.498
VIN = 3.5V
VREF (V)
VREF (V)
1.500
1.496
1.492
0
5
10
15
20
ILOAD (mA)
25
1.496
1.494
30
FIGURE 35. DIFFERENT VIN AT ROOM TEMPERATURE
FN6934 Rev.7.00
Sep 28, 2018
VIN = 3.5V
VIN = 3.3V
VIN = 3.3V
1.494
1.498
35
1.492
0
5
10
15
20
25
30
35
ILOAD (mA)
FIGURE 36. DIFFERENT VIN AT HIGH TEMPERATURE (+85°C)
Page 14 of 23
ISL21080
Applications Information
FGA Technology
The ISL21080 series of voltage references use floating gate
technology to create references with very low drift and supply
current. Essentially, the charge stored on a floating gate cell is
set precisely in manufacturing. The reference voltage output
itself is a buffered version of the floating gate voltage. The
resulting reference device has excellent characteristics which are
unique in the industry: very low temperature drift, high initial
accuracy, and almost zero supply current. The reference voltage
itself is not limited by voltage bandgaps or Zener settings, so a
wide range of reference voltages can be programmed (standard
voltage settings are provided, but customer-specific voltages are
available).
The process used for these reference devices is a floating gate
CMOS process, and the amplifier circuitry uses CMOS transistors
for amplifier and output transistor circuitry. While providing
excellent accuracy, there are limitations in output noise level and
load regulation due to the MOS device characteristics. These
limitations are addressed with circuit techniques discussed in
other sections.
Board Assembly Considerations
FGA references provide high accuracy and low temperature drift
but some PCB assembly precautions are necessary. Normal
Output voltage shifts of 100µV to 1mV can be expected with
Pb-free reflow profiles or wave solder on multi-layer FR4 PC
boards. Avoid excessive heat or extended exposure to high reflow
or wave solder temperatures. This may reduce device initial
accuracy.
Because these machines vary in X-ray dose delivered, it is
difficult to produce an accurate maximum pass
recommendation.
Nanopower Operation
Reference devices achieve their highest accuracy when powered
up continuously, and after initial stabilization has taken place.
This drift can be eliminated by leaving the power on continuously.
The ISL21080 is the first high precision voltage reference with
ultra low power consumption that makes it possible to leave
power on continuously in battery operated circuits. The ISL21080
consumes extremely low supply current due to the proprietary
FGA technology. Supply current at room temperature is typically
350nA, which is 1 to 2 orders of magnitude lower than
competitive devices. Application circuits using battery power
benefit greatly from having an accurate, stable reference, which
essentially presents no load to the battery.
In particular, battery powered data converter circuits that would
normally require the entire circuit to be disabled when not in use
can remain powered up between conversions as shown in
Figure 37. Data acquisition circuits providing 12 bits to 24 bits of
accuracy can operate with the reference device continuously
biased with no power penalty, providing the highest accuracy and
lowest possible long term drift.
VIN = +3.0V
10µF
VIN
In addition to post-assembly examination, other X-ray sources
may affect the FGA reference long term accuracy. Airport
screening machines contain X-rays and has a cumulative effect
on the voltage reference output accuracy. Carry-on luggage
screening uses low level X-rays and is not a major source of
output voltage shift; however, if a product is expected to pass
through that type of screening over 100 times, it may need to
consider shielding with copper or aluminum. Checked luggage
X-rays are higher intensity and can cause output voltage shift in
much fewer passes, thus devices expected to go through those
machines should definitely consider shielding. Note that just two
layers of 1/2 ounce copper planes reduce the received dose by
over 90%. The leadframe for the device which is on the bottom
also provides similar shielding.
If a device is expected to pass through luggage X-ray machines
numerous times, it is advised to mount a 2-layer (minimum) PCB
on the top, and along with a ground plane underneath will
effectively shield it from 50 to 100 passes through the machine.
FN6934 Rev.7.00
Sep 28, 2018
VOUT
ISL21080
GND
0.001µF TO 0.01µF
Post-assembly X-ray inspection may also lead to permanent
changes in device output voltage and should be minimized or
avoided. If X-ray inspection is required, it is advisable to monitor
the reference output voltage to verify excessive shift has not
occurred. If large amounts of shift are observed, it is best to add an
X-ray shield consisting of thin zinc (300µm) sheeting to allow clear
imaging, yet block X-ray energy that affects the FGA reference.
Special Applications Considerations
0.01µF
REF IN
ENABLE
SERIAL
BUS
SCK
SDAT
12 TO 24-BIT
A/D CONVERTER
FIGURE 37. REFERENCE INPUT FOR ADC CONVERTER
Other reference devices consuming higher supply currents need
to be disabled in between conversions to conserve battery
capacity. Absolute accuracy suffers as the device is biased and
requires time to settle to its final value, or, may not actually settle
to a final value as power on time may be short. Table 1 shows an
example of battery life in years for ISL21080 in various power on
conditions with 1.5µA maximum current consumption.
TABLE 1. EXAMPLE OF BATTERY LIFE IN YEARS FOR ISL21080 IN
VARIOUS POWER ON CONDITIONS WITH 1.5µA MAX
CURRENT
BATTERY RATING
(mAH)
CONTINUOUS
50% DUTY
CYCLE
10% DUTY
CYCLE
40
3
6
30*
225
16.3*
32.6*
163*
NOTE: *Typical Li-ion battery has a shelf life of up to 10 years.
Page 15 of 23
ISL21080
ISL21080 Used as a Low Cost Precision
Current Source
10000
ZOUT (Ω)
Using an N-JET and an ISL21080 Nanopower voltage reference, a
precision, low cost, high impedance current source can be
created. The precision of the current source is largely dependent
on the tempco and accuracy of the reference. The current setting
resistor contributes less than 20% of the error.
100000
1000
F = 10Hz
F = 60Hz
F = 100Hz
F = 1000Hz
100
+8V TO 28V
ISET =
VOUT
RSET
IL = ISET + IRSET
10
10
100
10000
1000
ILOAD (μA)
VIN
0.01µF
FIGURE 40. ZOUT VS LOAD (SOURCING AND SINKING) CURRENT, NO
LOAD CAPACITANCE
VOUT
ISL21080-1.5
VOUT = 1.5V
RSET
ZOUT > 100MΩ
10kΩ
0.1%
10ppm/°C
1000
GND
ISY ~ 0.31µA
ISET
FIGURE 38. ISL21080 USED AS A LOW COST PRECISION CURRENT
SOURCE
ZOUT (Ω)
IL AT 0.1% ACCURACY
~150.3µA
100
10
F = 10Hz
F = 60Hz
F = 100Hz
F = 1000Hz
1
Output Impedance vs Load Current
ISL21080 1.5V
VIN = 3.3V
500mV/DIV
0.1
10
100
1000
10000
ILOAD (μA)
FIGURE 41. ZOUT VS LOAD (SOURCING) CURRENT, NO LOAD
CAPACITANCE
10000
F = 10Hz
F = 60Hz
F = 100Hz
F = 1000Hz
1000
ZOUT (Ω)
The normal operation of the ISL21080 is to “source current” at a
specific reference voltage. This part is not suitable for
applications resulting in the output having to simultaneously
source and sink load currents, as it is a nano-powered part. This
can occur if the voltage reference is used in a bi-directional filter
resulting in output currents having to both source and sink. In an
event where such currents are applied, at every zero crossing, the
part becomes unstable and generates voltage spikes as shown in
Figure 39 (blue trace). The output impedance due to these
voltage spikes is much larger (Figure 40) than if the voltage
reference is only sourcing (Figure 41) or only sinking (Figure 42).
Notice in Figure 41 and Figure 42, there is a direct correlation
between the output impedance vs load current.
100
10
1
RS = 50k
0.1
VOUT 20mV/DIV
10
100
1000
10000
ILOAD (μA)
FIGURE 42. ZOUT VS LOAD (SINKING) CURRENT, NO LOAD
CAPACITANCE
40ms/DIV
FIGURE 39. OUTPUT VOLTAGE SPIKES CAUSED BY SOURCING AND
SINKING OUTPUT LOAD CURRENTS AT ZERO CROSSING
FN6934 Rev.7.00
Sep 28, 2018
Page 16 of 23
ISL21080
Board Mounting Considerations
Turn-On Time
For applications requiring the highest accuracy, board mounting
location should be reviewed. Placing the device in areas subject to
slight twisting can reduce the accuracy of the reference voltage due
to die stresses. It is normally best to place the device near the edge
of a board, or the shortest side, as the axis of bending is most
limited at that location. Obviously, mounting the device on flexprint
or extremely thin PC material will likewise cause loss of reference
accuracy.
The ISL21080 devices have ultra-low supply current and thus, the
time to bias-up internal circuitry to final values is longer than with
higher power references. Normal turn-on time is typically 4ms.
Because devices can vary in supply current down to >300nA,
turn-on time can last up to about 12ms. Care should be taken in
system design to include this delay before measurements or
conversions are started.
Noise Performance and Reduction
The output noise voltage in a 0.1Hz to 10Hz bandwidth is
typically 30µVP-P. Noise in the 10kHz to 1MHz bandwidth is
approximately 400µVP-P with no capacitance on the output, as
shown in Figure 43. These noise measurements are made with a
2 decade bandpass filter made of a 1-pole high-pass filter with a
corner frequency at 1/10 of the center frequency and 1-pole
low-pass filter with a corner frequency at 10 times the center
frequency. Figure 43 also shows the noise in the 10kHz to 1MHz
band can be reduced to about 50µVP-P using a 0.001µF
capacitor on the output. Noise in the 1kHz to 100kHz band can
be further reduced using a 0.1µF capacitor on the output, but
noise in the 1Hz to 100Hz band increases due to instability of the
very low power amplifier with a 0.1µF capacitance load. For load
capacitances above 0.001µF, the noise reduction network shown
in Figure 44 is recommended. This network reduces noise
significantly over the full bandwidth. As shown in Figure 43, noise
is reduced to less than 40µVP-P from 1Hz to 1MHz using this
network with a 0.01µF capacitor and a 2kΩ resistor in series with
a 10µF capacitor.
NOISE VOLTAGE (µVP-P)
400
Temperature Coefficient
The limits stated for temperature coefficient (tempco) are governed
by the method of measurement. The overwhelming standard for
specifying the temperature drift of a reference is to measure the
reference voltage at two temperatures, take the total variation,
(VHIGH - VLOW), and divide by the temperature extremes of
measurement (THIGH – TLOW). The result is divided by the nominal
reference voltage (at T = +25°C) and multiplied by 106 to yield
ppm/°C. This is the “Box” method for specifying temperature
coefficient.
CL = 0
350
CL = 0.001µF
300
CL = 0.1µF
CL = 0.01µF AND 10µF + 2kΩ
250
200
150
100
50
0
1
10
100
1k
10k
100k
FIGURE 43. NOISE REDUCTION
VIN = 3.0V
10µF
0.1µF
VIN
VO
ISL21080
GND
2kΩ
0.01µF
10µF
FIGURE 44. NOISE REDUCTION NETWORK
FN6934 Rev.7.00
Sep 28, 2018
Page 17 of 23
ISL21080
Typical Application Circuits
VIN = 3.0V
R = 200Ω
2N2905
VIN
ISL21080 VOUT
2.5V/50mA
0.001µF
GND
FIGURE 45. PRECISION 2.5V 50mA REFERENCE
2.7V TO 5.5V
0.1µF
10µF
VIN
VOUT
ISL21080
GND
0.001µF
VCC
RH
VOUT
X9119
+
SDA
2-WIRE BUS
SCL
VSS
–
VOUT
(BUFFERED)
RL
FIGURE 46. 2.5V FULL SCALE LOW-DRIFT 10-BIT ADJUSTABLE VOLTAGE SOURCE
2.7V TO 5.5V
0.1µF
10µF
VIN
VOUT
ISL21080
+
VOUT SENSE
–
LOAD
GND
FIGURE 47. KELVIN SENSED LOAD
FN6934 Rev.7.00
Sep 28, 2018
Page 18 of 23
ISL21080
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted.
Please visit our website to make sure you have the latest revision.
DATE
REVISION
Sep 28, 2018
FN6934.7
Added evaluation board part numbers to Ordering Information table.
Updated Figure 26, “ZOUT vs FREQUENCY, IOUT = 2mA,” on page 13 (the lower frequency responses were
changed for Output impedance with Iout = 2mA).
Updated Figure 27 (minor grid lines were added).
Added “Output Impedance vs Load Current” on page 16.
Mar 26, 2018
FN6934.6
Updated Related Literature section.
Updated Ordering Information table by adding -T7A part, tape and reel quantity column, and updating package
drawing number.
Updated Note 5 by fixing the induced error caused from importing new formatting. Changed 70mA to 70µA.
Removed About Intersil section.
Replaced POD P3.064 with POD P3.064A.
Jun 23, 2014
FN6934.5
Converted to New Template
Updated POD with following changes:
In Detail A, changed lead width dimension from 0.13+/-0.05 to 0.085-0.19
Changed dimension of foot of lead from 0.31+/-0.10 to 0.38+/-0.10
In Land Pattern, added 0.4 Rad Typ dimension
In Side View, changed height of package from 0.91+/-0.03 to 0.95+/-0.07
May, 12, 2010
FN6934.4
Changed Theta JA in the “Thermal Information” on page 3 from 170 to 275. Added Theta JC and applicable note.
FN6934 Rev.7.00
Sep 28, 2018
CHANGE
Page 19 of 23
ISL21080
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted.
Please visit our website to make sure you have the latest revision. (Continued)
DATE
REVISION
Apr 29, 2010
FN6934.3
CHANGE
Incorrect Thermal information, needs to be re-evaluated and added at a later date when the final data is
available. Removed Theta JC and applicable note from “Thermal Information” on page 3.
Apr 14, 2010
Corrected y axis label on Figure 9 from “VOUT (V)” to “VOUT (µV)”
Apr 6, 2010
Source/sink for 0.9V option changed from 7mA to 10mA
Line regulation condition for 0.9V changed from 2.7V to 2V
Line regulation typical for 0.9V option changed from 10 to 30µV/V
TA in Thermal Hysterisis conditions of 0.9V option changed from 165°C to 125°C
Moved “Board Assembly Considerations” and “Special Applications Considerations” to page 15. Deleted
“Handling and Board Mounting” section since “Board Assembly Considerations” on page 15 contains same
discussion.
Added “Special Note: Post-assembly X-ray inspection may lead to permanent changes in device output voltage
and should be minimized or avoided.” to “ISL21080” on page 1
Figures 2 and 3 revised to show line regulation and Iin down to 2V.
Figures 4 and 5 revised to show Vin down to 2V.
Added “Initial accuracy can change 10mV or more under extreme radiation.” to Note 9 on page 8.
Apr 1, 2010
1. page 3: Change Vin Min from 2.7 to 2.0
2. page 3: Change Iin Typ from 0.31 to 0.35
3. page 3: Change Line Reg Typ from 80 to 10
4. page 3: Change Load Reg Condition from 7mA to 10mA and -7mA to -10mA
5. page 3: Change Load Reg Typ for Source from 25 to 6 and Sink from 50 to 23.
6. page 3: Change Isc Typ from 50 to 30
7. page 3: Change tR from 4 to 1
8. Change Ripple Rejection typ for all options from -30 to -40
9. page 3: Change eN typ from 30 to 40V
10. page 3: Change VN typ from 50 to 10V
11. page 3: Change Noise Density typ from 1.1 to 2.2
12. page 3: Change Long Term Stability from 50 to 60
13. Added Figure 2 to 13 on page 9 to page 10 for 0.9V curves.
14. Added Figure 28 to 34 on page 13 to page 14 for other options Dropout curve.
15. page 1: Change Input Voltage Range for 0.9V option from TBD to 2V to 5.5V
16. Added latch up to “Absolute Maximum Ratings” on page 3
17. Added Junction Temperature to “Thermal Information” on page 3
18. Added JEDEC standards used at the time of testing for “ESD Ratings” on page 3
19. HBM in “Absolute Maximum Ratings” on page 3 changed from 5.5kV to 5kV
20. Added Theta JC and applicable note.
Mar 25, 2010
FN6934 Rev.7.00
Sep 28, 2018
Throughout- Converted to new format. Changes made as follows:
Moved “Pin Configuration” and “Pin Descriptions” to page 2
Added “Related Literature” to page 1
Added key selling feature graphic Figure 1 to page 1
Added "Boldface limits apply..." note to common conditions of Electrical Specifications tables on page 3 through
page 8. Bolded applicable specs. Added Note 13 to MIN MAX columns of all Electrical Specifications tables.
Added ““Environmental Operating Conditions” to page 3 and added Note 5
Added “The process used for these reference devices is a floating gate CMOS process, and the amplifier circuitry
uses CMOS transistors for amplifier and output transistor circuitry. While providing excellent accuracy, there are
limitations in output noise level and load regulation due to the MOS device characteristics. These limitations are
addressed with circuit techniques discussed in other sections.” on page 15
Page 20 of 23
ISL21080
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted.
Please visit our website to make sure you have the latest revision. (Continued)
DATE
REVISION
Oct 14, 2009
FN6934.2
1. Removed “Coming Soon” on page 1 and 2 for -10, -20, -41, and -50 options.
2. Page 1. Moved “ISL21080-505.5V to 8.0V" from bullet to sub-bullet.
3. Update package outline drawing P3.064 to most recent revision. Updates to package were to add land
pattern and move dimensions from table onto drawing (no change to package dimensions)
Sep 04, 2009
FN6934.1
Converted to new Intersil template. Added Revision History and Products Information. Updated Ordering
Information to match Intrepid, numbered all notes and added Moisture
Sensitivity Note with links. Moved Pin Descriptions to page 1 to follow pinout
Changed in Features Section
From: Reference Output Voltage1.25V, 1.5V, 2.500V, 3.300V
To: Reference Output Voltage
0.900V, 1.024V, 1.250V, 1.500V, 2.048V, 2.500V, 3.000V,
3.300V, 4.096V, 5.000V
From: Initial Accuracy: 1.5V±0.5%
To: Initial Accuracy:
ISL21080-09 and -10±0.7%
ISL21080-12 ±0.6%
ISL21080-15±0.5%
ISL21080-20 and -25±0.3%
ISL21080-30, -33, -41, and -50±0.2%
FROM: Input Voltage Range
ISL21080-12 (Coming Soon)2.7V to 5.5V
ISL21080-152.7V to 5.5V
ISL21080-25 (Coming Soon)2.7V to 5.5V
ISL21080-33 (Coming Soon)3.5V to 5.5V
TO: Input Voltage Range:
ISL21080-09, -10, -12, -15, -20, and -252.7V to 5.5V
ISL21080-09, -10, and 20 (Coming Soon)
ISL21080-303.2V to 5.5V
ISL21080-333.5V to 5.5V
ISL21080-41 (Coming Soon)4.5V to 8.0V
Added: ISL21080-50 (Coming Soon)5.5V to 8.0V Output Voltage Noise
30µVP-P (0.1Hz to 10Hz)
Updated Electrical Spec Tables by Tables with Voltage References 9, 10, 12, 20, 25, 30, 33
and 41.
Added to Abs Max Ratings:
VIN to GND (ISL21080-41 and 50 only-0.5V to +10V
VOUT to GND (10s)
(ISL21080-41 and 50 only-0.5V to +5.1V
Changed Tja in Thermal information from “202.70” to “170” to match ASYD in Intrepid
Added Note:
Post-assembly X-ray inspection may also lead to permanent changes in device output voltage and should be
minimized or avoided. Most inspection equipment will not affect the FGA reference voltage, but if X-ray
inspection is required, it is advisable to monitor the reference output voltage to verify excessive shift has not
occurred.
Added Special Applications Considerations Section on page 12.
Jul 28, 2009
FN6934.0
Initial Release.
FN6934 Rev.7.00
Sep 28, 2018
CHANGE
Page 21 of 23
ISL21080
Package Outline Drawing
P3.064A
3 LEAD SMALL OUTLINE TRANSISTOR PLASTIC PACKAGE (SOT23-3)
Rev 0, 7/14
2.92 ±0.12
4
DETAIL "A"
0.13 ±0.05
CL
CL
1.30 ±0.10
4
2.37 ±0.27
0 to 8°
0.950
0.435 ±0.065
0.20 M C
TOP VIEW
10° TYP
(2 plcs)
0.91 ±0.03
GAUGE PLANE
1.00 ±0.12
SEATING PLANE
C
SEATING PLANE
0.10 C
0.31 ±0.10 5
0.013(MIN)
0.100(MAX)
SIDE VIEW
DETAIL "A"
(0.60)
NOTES:
(2.15)
(1.25)
1.
Dimensions are in millimeters.
Dimensions in ( ) for Reference Only.
2.
Dimensioning and tolerancing conform to ASME Y14.5M-1994.
3.
Reference JEDEC TO-236.
4.
Dimension does not include interlead flash or protrusions.
Interlead flash or protrusions shall not exceed 0.25mm per side.
5.
Footlength is measured at reference to gauge plane.
(0.4 RAD typ)
(0.95 typ.)
TYPICAL RECOMMENDED LAND PATTERN
FN6934 Rev.7.00
Sep 28, 2018
Page 22 of 23
Notice
1.
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