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LTC1542_15 Datasheet, PDF (1/12 Pages) Linear Technology – Micropower Op Amp, Comparator and Reference | |||
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LTC1541/LTC1542
Micropower Op Amp,
Comparator and Reference
FEATURES
â Quiescent Current: 5µA Typ
â Outputs Swing Rail-to-Rail
â Low Op Amp Offset Voltage: 700µV Max
â Reference Output Drives 0.01µF Capacitor
â Internal 1.2V ±0.4% Reference Output (LTC1541)
â Low Input Bias Current: 1nA Max
â Reference Output Can Source Up to 2mA
â Internal ±2.25mV Comparator Hysteresis
â Comparator and Op Amp Input Range
Includes Ground
â Op Amp Capable of Driving Up to 1000pF Load
â Unity-Gain Stable and 12kHz Bandwidth
â 2.5V to 12.6V Supply Voltage Range
â Pin Compatible UpDgariasdy-eChfoarinMedACXo9n5tr1ol/MOuAtpXu9ts53
â Available in 3mm x 3mm x 0.8mm DFN Package
U
APPLICATIO S
â Battery- or Solar-Powered Systems
â Automotive Keyless Entry
â Low Frequency, Local Area Alarms/Detectors
â Infrared Receivers for Remote Controls
â Smoke Detectors and Safety Sensors
â GSM Portable Phones
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
DESCRIPTIO
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
comparatorâs 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).
TYPICAL APPLICATIO
Pilot Light Flame Detector with Low-Battery Lockout
VIN = 3.6V TO 9V
TYPE R
1N457
10M
1k 100k
â+
10k 1N457
ICC = 7µA AT VIN = 5V
3+
8
1
2.2µF 1/2 LTC1541
2â
2M
1M
2M
10k
OUTPUT HIGH = âONâ
OUTPUT LOW = âOFFâ
2N3904
5+
1/2 LTC1541
6â
SCR LOAD
7 LOW BATTERY
1.2V INTERNAL
REFERENCE
VN2222
1541/42 ⢠TA01
Op Amp VOS Distribution,
VCM = 2.5V, SO-8 Package
Total of 839 Units
50
VCC = 5V
VSS = 0V
40
30
20
10
0
â600
â300
0
300
600
INPUT OFFSET VOLTAGE (µV)
1541/42 TA02
15412fd
1
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