ISL21440_11 Datasheet, PDF (1/16 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
• Low Battery Detector
• Low Voltage Reset
• Overvoltage Monitor
• Window Comparator
VBAT
2.4M
1.8M
20k
2.4M
Vdd
V+
IN+
+
IN- _-
OUT
HYST
REF
ISL21440
LoBAT-
V-
GND
LOW BATTERY DETECTOR
FIGURE 1. TYPICAL APPLICATION
1.190
1.188
1.186
1.184 ^{V+ = 5V}
1.182
1.180
1.178
1.176
1.174
1.172
-40 -20 0
V+ = 3V
V+ = 2V
20 40 60 80
TEMPERATURE (°C)
100 120
FIGURE 2. REFERENCE VOLTAGE vs TEMPERATURE
February 23, 2011
1
FN6532.2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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