LTC1541CS8(V2) データシートの表示（PDF） - Linear Technology
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LTC1541CS8 Datasheet PDF : 8 Pages
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FEATURES
s Quiescent Current: 5µA Typ
s Outputs Swing Rail-to-Rail
s Low Op Amp Offset Voltage: 700µV Max
s Reference Output Drives 0.01µF Capacitor
s Internal 1.2V ±0.4% Reference Output
s Low Input Bias Current: 1nA Max
s Reference Output Can Source Up to 2mA
s Internal ±3mV Comparator Hysteresis
s Comparator and Op Amp Input Range
Includes Ground
s Op Amp Capable of Driving Up to 1000pF Load
s Unity-Gain Stable and 12kHz Bandwidth
s 2.5V to 12.6V SupDpalyisyV-oClhtaaigneedRCaonngtreol Outputs
s Pin Compatible Upgrade for MAX951
U
APPLICATIONS
s Battery- or Solar-Powered Systems
s Automotive Keyless Entry
s Low Frequency, Local Area Alarms/Detectors
s Infrared Receivers for Remote Controls
s Smoke Detectors and Safety Sensors
s GSM Portable Phones
Final Electrical Specifications
LTC1541
Micropower Op Amp,
Comparator and Reference
January 1998
DESCRIPTION
The LTC®1541 combines a micropower amplifier, com-
parator and bandgap reference in an 8-pin package. The
part operates from a single 2.5V to 12.6V or dual ±1.25V
to ±6.3V supply with a typical supply current of 5µA. Both
the op amp and comparator feature a common mode input
voltage range that extends from the negative supply to
within 1.3V of the positive supply. The op amp output
stage swings from rail-to-rail. The comparator’s inverting
input is internally connected to the reference output.
The reference output voltage is 1.2V ±1% over the
extended temperature range. The output can drive a
bypass capacitor of up to 0.01µF without any oscillations.
It can also source up to 2mA and sink up to 20µA.
The op amp is internally compensated to be unity-gain
stable with typical GBW at 12kHz and slew rate of 8V/ms.
The comparator has ±3mV of internal hysteresis to ensure
clean output switching, even with slow moving input
signals.
The LTC1541 is available in MSOP and SO-8 packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Pilot Light Flame Detector with Low-Battery Lockout
TYPE R
1N457
10M
VIN = 3.6V TO 9V
1k 100k
–+
10k 1N457
ICC = 7µA AT VIN = 5V
3+
8
2.2µF 1/2 LTC1541 1
2–
2M
1M
2M
10k
OUTPUT HIGH = “ON”
OUTPUT LOW = “OFF”
2N3904
5+
1/2 LTC1541
6–
SCR LOAD
7 LOW BATTERY
1.2V INTERNAL
REFERENCE
VN2222
LTC1541 • TA01
Reference Output vs Temperature
1.202
1.201
1.200
1.199
1.198
1.197
1.196
1.195
– 50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1541 TA02
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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