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PDF ISL21440 Data sheet ( Hoja de datos )
| Número de pieza | ISL21440 | |
| Descripción | Micropower Voltage Reference | |
| Fabricantes | Intersil | |
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ISL21440
Micropower Voltage Reference with Comparator
The ISL21440 is a micropower, FGA reference, and comparator
on a single chip. Drawing less than 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.
DATASHEET
FN6532
Rev.4.00
Mar 24, 2017
Features
• 5µA supply current across 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
VBAT
2.4M
1.8M
20k
2.4M
VDD
IN+
+
IN- -
HYST
REF
V+
OUT LoBAT-
ISL21440
V- GND
LOW BATTERY DETECTOR
FIGURE 1. TYPICAL APPLICATION
1.190
1.188
V+ = 3V
1.186
1.184 V+ = 5V
1.182
1.180
1.178
1.176
V+ = 2V
1.174
1.172
-40 -20 0
20 40 60 80 100
TEMPERATURE (°C)
FIGURE 2. REFERENCE VOLTAGE vs TEMPERATURE
120
FN6532 Rev.4.00
Mar 24, 2017
Page 1 of 15
1 page  
ISL21440
Analog Specifications (V+ = +3.0V) V- = GND = 0V unless otherwise specified, TA = +25°C. Boldface limits apply across the
operating temperature range, -40°C to +125°C. (Continued)
SYMBOL
PARAMETER
TEST CONDITIONS
MIN TYP MAX
(Note 11) (Note 10) (Note 11) UNIT
PSRR Power Supply Rejection Ratio
V+ = 2V to 11V
MSOP Package
0.25
1.1 mV/V
1.2 mV/V
TDFN Package
0.25
1.5 mV/V
1.6 mV/V
VHYST
tPHL
Hysteresis Input Voltage
Propagation Delay - HIGH to LOW Transition CL = 100pF
Overdrive = 10mV
Overdrive = 100mV
REF - 50mV
100
50
REF V
µs
µs
tPLH Propagation Delay - LOW to HIGH Transition CL = 100pF
Overdrive = 10mV
Overdrive = 100mV
200 µs
100 µs
VOH Output High Voltage
VOL Output Low Voltage
REFERENCE
IO = -6mA
IO = 1.8mA
(V+) - 0.4
GND + 0.6
V
V
VREF
VREF
Reference Voltage
Output Load Regulation
No Load
0 ≤ ISOURCE ≤ 2mA
1.176
1.188
V
-0.5 -2.0 mV
-2.5 mV
0≤ ISINK ≤ 10µA
0.1 2.0 mV
-2.5 mV
NOTES:
10. Across 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 +125°C = +165°C.
11. 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
2.5
2.0
1.5
1.0
0.5
0
-40
V+ = 5V
-20 0 20 40 60 80
TEMPERATURE (°C)
FIGURE 4. IDD vs TEMPERATURE
V+ = 3V
100 120
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
VDD (V)
FIGURE 5. IDD vs VDD
FN6532 Rev.4.00
Mar 24, 2017
Page 5 of 15
5 Page 
ISL21440
Typical Applications
Low Battery Detector
Figure 27 shows a typical implementation for the ISL21440, a
low battery detector. The values for RREF and RHYST provide
20mV of hysteresis and 0.5µA IREF. The input trip point for
VDETECT is the same as the reference voltage, 1.182V, and a
resistor divider at the input sets the LoBAT trip point at 2.7V. The
total current draw for the circuit is going to be 1.1µA for VDD and
0.6µA for VBAT.
VDD
VBAT
2.4M
IN+
+
IN- -
V+
OUT LoBAT-
1.8M
20k
HYST
REF
ISL21440
2.4M
V- GND
FIGURE 27. LOW BATTERY DETECTOR WITH HYSTERESIS
Window Comparator
The ISL21440 can be combined with a micropower comparator
to produce a window comparator circuit. The circuit in Figure 28
uses a 3-resistor divider to produce high and low trip points and
the ISL28197 (800nA supply current) comparator is added to
give the second output. The two outputs can be used separately
for overvoltage or undervoltage indication, or a gate can be
added as shown to report either in-window or out-of window
condition.
The resistors are shown as Equations 3, 4, and 5 as follows.
Set:
R3 = 1M1%
R2 = R3VH VL – 1
(EQ. 3)
(EQ. 4)
R1 = R3VH VREF – 1 – R2
(EQ. 5)
Example: For VH = 3.8V, VL = 2.7V (3.3V ± 0.5V)
R2 = 402k, R1 = 1.82M (can be 1%)
The resulting circuit draws about 3µA and works down to
VDD = 2.2V.
VBAT
R1
R2
VBAT OR VDD
V+
IN+
+ OUT
IN- -
HYST
REF
ISL21440
VLOW-
VHI-
VWINDOW
V- GND
+
-
ISL28197
R3
FIGURE 28. WINDOW COMPARATOR CIRCUIT
FN6532 Rev.4.00
Mar 24, 2017
Page 11 of 15
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet ISL21440.PDF ] | |
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