1
LTC1541/LTC1542
15412fd
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Micropower Op Amp,
Comparator and Reference
Daisy-Chained Control Outputs
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 ±2.25mV 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. For space-limited applications, the LTC1541/
LTC1542 are available in a 3mm x 3mm low profile
(0.8mm) dual fine-pitch leadless package (DFN).
■
Quiescent Current: 5µA Typ
■
Outputs Swing Rail-to-Rail
■
Low Op Amp Offset Voltage: 700µV Max
■
Reference Output Drives 0.01µF Capacitor
■
Internal 1.2V ±0.4% Reference Output (LTC1541)
■
Low Input Bias Current: 1nA Max
■
Reference Output Can Source Up to 2mA
■
Internal ±2.25mV Comparator Hysteresis
■
Comparator and Op Amp Input Range
Includes Ground
■
Op Amp Capable of Driving Up to 1000pF Load
■
Unity-Gain Stable and 12kHz Bandwidth
■
2.5V to 12.6V Supply Voltage Range
■
Pin Compatible Upgrade for MAX951/MAX953
■
Available in 3mm x 3mm x 0.8mm DFN Package
■
Battery- or Solar-Powered Systems
■
Automotive Keyless Entry
■
Low Frequency, Local Area Alarms/Detectors
■
Infrared Receivers for Remote Controls
■
Smoke Detectors and Safety Sensors
■
GSM Portable Phones
Op Amp V
OS
Distribution,
V
CM
= 2.5V, SO-8 Package
Total of 839 Units
INPUT OFFSET VOLTAGE (µV)
–600
PERCENT OF UNITS (%)
600
–300
0 300
50
40
30
20
10
0
V
CC
= 5V
V
SS
= 0V
1541/42 TA02
–
+
1
2
3
7
8
2N3904
SCR LOAD
5
2M
6
2.2µF1N457
LOW BATTERY
OUTPUT HIGH = “ON”
OUTPUT LOW = “OFF”
1.2V INTERNAL
REFERENCE
1541/42 • TA01
–
+
10k
VN2222
2M
1M
100k
10M
1k
–+
1/2 LTC1541
1/2 LTC1541
10k
I
CC
= 7µA AT V
IN
= 5V
TYPE R
1N457
V
IN
= 3.6V TO 9V
Pilot Light Flame Detector with Low-Battery Lockout
FEATURES
DESCRIPTIO
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APPLICATIO S
U
TYPICAL APPLICATIO
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