LTC1541 Datasheet, PDF (1/12 Pages) Linear Technology – Micropower Op Amp, Comparator and Reference

LTC1541/LTC1542
Micropower Op Amp,
Comparator and Reference
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 (LTC1541)}
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/MAX953}
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}
DESCRIPTION
The LTC^®1541/LTC1542 combine a micropower ampli-
fier, comparator and bandgap reference (LTC1541) 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 (LTC1541).
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/LTC1542 are 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
V_IN = 3.6V TO 9V
1k 100k
–+
10k 1N457
I_CC = 7µA AT V_IN = 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
1541/42 • TA01
Op Amp V_OS Distribution,
V_CM = 2.5V, SO-8 Package
Total of 839 Units
50
V_CC = 5V
V_SS = 0V
40
30
20
10
0
–600
–300
0
300
600
INPUT OFFSET VOLTAGE (µV)
1541/42 TA02
1