DATASHEET
ISL21440
Micropower Voltage Reference with Comparator
The
ISL21440
is a micropower, FGA reference, and comparator
on a single chip. Drawing less than 6.5µA supply current
across the full operating temperature range, the ISL21440
operates from a single 2V to 11V supply and can also be used
with split bipolar supplies.
The ISL21440’s on-board reference provides a 1.182V ±0.5%
output. It features programmable hysteresis and TTL/CMOS
compatible outputs that sink and source current. Low bias
currents permit high value divider resistors for typical circuit
current drains of <2.5µA.
The low supply current makes the ISL21440 ideal for battery
powered devices in battery level or low voltage monitor
circuits.
The ISL21440 is a pin-compatible, performance upgrade of
the LTC1440, LTC1540, MAX921, and MAX931.
FN6532
Rev. 6.00
Mar 12, 2018
Features
• 6.5µA supply current across the full temperature range
• Wide supply range . . . . . . . . . . . . . . . . . . . . . . . . . . . 2V to 11V
• Precision 1.182V ±0.5% voltage reference
• Comparator with user programmable hysteresis
• Temperature range . . . . . . . . . . . . . . . . . . . .-40°C to +125°C
• 8 Ld MSOP and 8 Ld TDFN packages
• Pin compatible upgrade to MAX921 and LTC1440
Applications
• Low battery detector
• Low voltage reset
• Overvoltage monitor
• Window comparator
Related Literature
For a full list of related documents, visit our website
•
ISL21440
product page
V
DD
V
BAT
2.4M
V+
IN+
+
IN-
1.8M
20k
HYST
ISL21440
REF
-
V
REF
(V)
OUT
Lo
BAT-
1.190
1.188
1.186
1.184
1.182
1.180
1.178
1.176
2.4M
V-
GND
1.174
1.172
-40
LOW BATTERY DETECTOR
-20
0
20
40
60
TEMPERATURE (°C)
80
100
120
V+ = 2V
V+ = 5V
V+ = 3V
FIGURE 1. TYPICAL APPLICATION
FIGURE 2. REFERENCE VOLTAGE vs TEMPERATURE
FN6532 Rev. 6.00
Mar 12, 2018
Page 1 of 15
ISL21440
Block Diagram
V+
IN+
+
IN-
-
OUT
HYST
ISL21440
REF
V-
GND
FIGURE 3. BLOCK DIAGRAM
Pin Configuration
ISL21440
(8 LD MSOP, 8 LD TDFN)
TOP VIEW
GND
V-
IN+
IN-
1
2
3
4
8
7
6
5
OUT
V+
REF
HYST
Pin Descriptions
PIN SYMBOL
1
2
3
4
5
GND
V-
IN+
IN-
HYST
DESCRIPTION
Ground pin. Sets the comparator output low level.
Negative supply input for voltage reference and
comparator.
Comparator noninverting input pin. Range: V- to
V+ -1.5V.
Comparator inverting input pin. Range: V- to V+ -1.5V.
Comparator hysteresis input. Accepts a voltage divided
from the reference output. Range is V
REF
- 50mV to
V
REF
. Connect directly to V
REF
for zero hysteresis.
Reference output. Source 2mA and Sink 10µA.
Positive supply input for comparator and reference.
Range is 2.0V to 11.0V
Comparator output, CMOS push-pull. Output swing
referenced to V+ and GND.
6
7
8
REF
V+
OUT
Ordering Information
PART NUMBER
(Notes
2, 3)
ISL21440IRTZ
ISL21440IRTZ-T13 (Note
1)
ISL21440IUZ
ISL21440IUZ-T13 (Note
1)
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), see the
ISL21440
product information page. For more information about MSL, see
TB363.
PART MARKING
1440
1440
1440Z
1440Z
V
DD
RANGE
(V)
2 to 11
2 to 11
2 to 11
2 to 11
TEMP RANGE
(°C)
-40 to +125
-40 to +125
-40 to +125
-40 to +125
TAPE and REEL
PACKAGE
(UNITS)
(RoHS COMPLIANT)
-
6k
-
2.5k
8 Ld TDFN
8 Ld TDFN
8 Ld MSOP
8 Ld MSOP
PKG.
DWG. #
L8.3x3G
L8.3x3G
M8.118
M8.118
FN6532 Rev. 6.00
Mar 12, 2018
Page 2 of 15
ISL21440
Absolute Maximum Ratings
Supply Voltage Range, V+ to GND . . . . . . . . . . . . . . . . . . . . . . -0.5V to +12V
IN+, IN- with Respect to V- . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (V+) +0.3V
GND with Respect to V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.0V to -0.3V
V+ with Respect to V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12V to -0.3V
REF, HYST with Respect to V- . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 1.5V
Out with Respect to GND . . . . . . . . . . . . . . . . . . . . . . . . . (V+) +0.3V to -0.3V
Voltage on All Other Pins . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to V
CC
+ 0.3V
ESD Rating
Human Body Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4kV
Machine Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350V
Charged Device Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2kV
Latch-Up (Tested Per JESD-78B; Class 1, Level A) . . . . . . . . . . . . . . 100mA
Thermal Information
Thermal Resistance (Typical)
JA
(°C/W)
JC
(°C/W)
8 Ld MSOP Package (Notes
5, 7)
. . . . . . . .
154
55
8 Ld TDFN Package (Notes
5, 6).
. . . . . . . .
68
8
Maximum Junction Temperature (Plastic Package) . . . . . . . . . . . .+150°C
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile (Note
8).
. . . . . . . . . . . . . . . . . . . . . . . . . . see
TB493
Recommended Operating Conditions
Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +125°C
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.5V
Environmental Operating Conditions
X-Ray Exposure (Note
4)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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:
4. 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 10.
5.
JA
is measured with the component mounted on a high-effective thermal conductivity test board in free air. See tech brief
TB379
for details.
6. For
JC
, the “case temp” location is the center of the exposed metal pad on the package underside.
7. For
JC
, the “case temp” location is taken at the package top center.
8. Post-reflow drift for the ISL21440 device voltage reference output will range from 100mV 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.
Analog Specifications (V+ = +5.0V)
operating temperature range, -40°C to +125°C.
PARAMETER
POWER SUPPLY
Supply Voltage Range
Supply Current
V
+
I
CC
SYMBOL
V- = GND = 0V unless otherwise specified, T
A
= +25°C. Boldface limits apply across the
MIN
(Note
10)
TYP
(Note
9)
MAX
(Note
10)
TEST CONDITIONS
UNIT
V- = GND
IN+ = IN- +80mV, HYST = REF
2.0
0.46
11.0
0.75
6.5
V
µA
µA
COMPARATOR
Input Offset Voltage
V
OS
V
CM
= 2.5V
MSOP Package
±3
±3.25
TDFN Package
±3.6
±3.75
Input Leakage Current (IN+, IN-, HYST)
IIN
V
IN+
= V
IN-
= 2.5V
MSOP Package
TDFN Package
0.1
0.1
1.4
1.5
3
Common-Mode Input Range
Common-Mode Rejection Ratio
V
CM
CMRR
V- to (V+ - 1.5V)
MSOP Package
V-
1.2
(V+) - 1.5
3
3.5
TDFN Package
1.2
4.5
5
mV
mV
mV
mV
nA
nA
nA
V
mV/V
mV/V
mV/V
mV/V
FN6532 Rev. 6.00
Mar 12, 2018
Page 3 of 15
ISL21440
Analog Specifications (V+ = +5.0V)
PARAMETER
Power Supply Rejection Ratio
SYMBOL
PSRR
V- = GND = 0V unless otherwise specified, T
A
= +25°C. Boldface limits apply across the
operating temperature range, -40°C to +125°C. (Continued)
TEST CONDITIONS
V+ = 2V to 11V
MSOP Package
MIN
(Note
10)
TYP
(Note
9)
0.25
MAX
(Note
10)
1.1
1.2
TDFN Package
0.25
1.5
1.6
Hysteresis Input Voltage
Propagation Delay - HIGH to LOW Transition
V
HYST
t
PHL
C
L
= 100pF
Overdrive = 10mV
Overdrive = 100mV
Propagation Delay - LOW to HIGH Transition
t
PLH
C
L
= 100pF
Overdrive = 10mV
Overdrive = 100mV
Output High Voltage
Output Low Voltage
REFERENCE
Reference Voltage
Output Load Regulation
V
REF
V
REF
No Load
0
≤
I
SOURCE
≤2mA
1.176
-0.5
1.188
-2.0
-2.5
0≤I
SINK
≤10µA
0.1
2.0
2.5
V
mV
mV
mV
mV
V
OH
V
OL
I
O
= -10mA
I
O
= 3mA
(V+) - 0.6
GND + 0.6
REF - 50mV
100
50
200
100
REF
UNIT
mV/V
mV/V
mV/V
mV/V
V
µs
µs
µs
µs
V
V
Analog Specifications (V+ = +3.0V)
operating temperature range, -40°C to +125°C.
PARAMETER
V+ = 3.0V, V- = GND = 0V
Supply Current
I
CC
SYMBOL
V- = GND = 0V unless otherwise specified, T
A
= +25°C. Boldface limits apply across the
MIN
(Note
10)
TYP
(Note
9)
MAX
(Note
10)
TEST CONDITIONS
UNIT
IN+ = IN- +80mV, HYST = REF
0.40
0.7
5
µA
µA
COMPARATOR
Input offset Voltage
V
OS
V
CM
= 1.5V
MSOP Package
±2.3
±3.4
±3.5
TDFN Package
±2.3
±4.2
±4.3
Input Leakage Current (IN+, IN-, HYST)
I
IN
V
IN+
= V
IN-
= 1.5V
0.1
1.1
3
Common-Mode Input Range
Common-Mode Rejection Ratio
V
CM
CMRR
V- to (V+ - 1.5V)
MSOP Package
V-
1.2
(V+) - 1.5
5
5.5
TDFN Package
1.2
7.5
8
mV
mV
mV
mV
nA
nA
V
mV/V
mV/V
mV/V
mV/V
FN6532 Rev. 6.00
Mar 12, 2018
Page 4 of 15
ISL21440
Analog Specifications (V+ = +3.0V)
PARAMETER
Power Supply Rejection Ratio
SYMBOL
PSRR
V- = GND = 0V unless otherwise specified, T
A
= +25°C. Boldface limits apply across the
operating temperature range, -40°C to +125°C. (Continued)
TEST CONDITIONS
V+ = 2V to 11V
MSOP Package
MIN
(Note
10)
TYP
(Note
9)
0.25
MAX
(Note
10)
1.1
1.2
TDFN Package
0.25
1.5
1.6
Hysteresis Input Voltage
Propagation Delay - HIGH to LOW Transition
V
HYST
t
PHL
C
L
= 100pF
Overdrive = 10mV
Overdrive = 100mV
Propagation Delay - LOW to HIGH Transition
t
PLH
C
L
= 100pF
Overdrive = 10mV
Overdrive = 100mV
Output High Voltage
Output Low Voltage
REFERENCE
Reference Voltage
Output Load Regulation
V
REF
V
REF
No Load
0
≤
I
SOURCE
≤
2mA
1.176
-0.5
1.188
-2.0
-2.5
0≤ I
SINK
≤
10µA
0.1
2.0
-2.5
V
mV
mV
mV
mV
V
OH
V
OL
I
O
= -6mA
I
O
= 1.8mA
(V+) - 0.6
GND + 0.6
REF - 50mV
100
50
200
100
REF
UNIT
mV/V
mV/V
mV/V
mV/V
V
µs
µs
µs
µs
V
V
NOTES:
9. Across the specified temperature range. Temperature coefficient is measured by the box method whereby the change in V
OUT
is divided by the
temperature range; in this case, -40°C to +125°C = +165°C.
10. Parts are 100% tested at +25°C and +85°C. The -40°C and +125°C temperature limits are established by characterization and are not production
tested.
Typical Performance Curves
4.0
3.5
3.0
I
DD
(µA)
2.5
2.0
1.5
1.0
0.5
0
-40
-20
0
20
40
60
80
V+ = 3V
100
120
I
DD
(µA)
V+ = 5V
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
2
3
4
5
6
7
8
9
10
11
TEMPERATURE (°C)
V
DD
(V)
FIGURE 4. I
DD
vs TEMPERATURE
FIGURE 5. I
DD
vs V
DD
FN6532 Rev. 6.00
Mar 12, 2018
Page 5 of 15
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