1
Micropower Voltage Reference with Comparator
ISL21440
The ISL21440 is a micropower, FGA™ reference and comparator
on a single chip. Drawing less than 1.8µA supply current over 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 monitors circuits.
The ISL21440 is a pin-compatible, performance upgrade of both
the LTC1440, LTC1540, MAX921 and MAX931.
Features
• 1.8µA Supply Current Over 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
FIGURE 1. TYPICAL APPLICATION
FIGURE 2. REFERENCE VOLTAGE vs TEMPERATURE
V+
OUT
IN-
HYST
GNDV-
REF
IN+
ISL21440
-
+
VBAT
Vdd
2.4M
20k
LoBAT-
2.4M
1.8M
LOW BATTERY DETECTOR
1.172
1.174
1.176
1.178
1.180
1.182
1.184
1.186
1.188
1.190
-40-200 20406080100120
TEMPERATURE (°C)
V
REF
(V)
V+ = 5V
V+ = 2V
V+ = 3V
February 23, 2011
FN6532.2
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. 2009-2011. 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.
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