ISL21440 Datasheet, PDF (1/15 Pages) Intersil Corporation – Micropower Voltage Reference with Comparator

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*(see page 13)
• Low Battery Detector
• Low Voltage Reset
• Overvoltage Monitor
• Window Comparator
Typical Application
Vdd
VBAT
2.4M
1.8M
20k
V+
IN+
+
IN- _-
OUT
HYST
REF
ISL21440
LoBAT-
2.4M
V-
GND
LOW BATTERY DETECTOR
Reference Voltage vs
Temperature
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 80 100 120
TEMPERATURE (°C)
March 2, 2010
FN6532.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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