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LTC1541 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1541 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page ![]() 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 ±1.25Vto±6.3Vsupplywithatypicalsupply current of 5 µA. 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 0.01 µF without any oscillations. It can also source up to 2mA and sink up to 20 µA. 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: 5 µA Typ ■ Outputs Swing Rail-to-Rail ■ Low Op Amp Offset Voltage: 700 µV Max ■ Reference Output Drives 0.01 µF 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 VOS Distribution, VCM = 2.5V, SO-8 Package Total of 839 Units INPUT OFFSET VOLTAGE ( µV) –600 600 –300 0 300 50 40 30 20 10 0 VCC = 5V VSS = 0V 1541/42 TA02 – + 1 2 3 7 8 2N3904 SCR LOAD 5 2M 6 2.2 µF 1N457 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 ICC = 7µA AT VIN = 5V TYPE R 1N457 VIN = 3.6V TO 9V Pilot Light Flame Detector with Low-Battery Lockout FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO |
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