Micropower Op Amp, Comparator and Reference

The LTC1541/LTC1542 combine a micropower amplifier, 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 × 3mm low profile (0.8mm) dual fine-pitch leadless package (DFN).

Applications

* 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

* 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 × 3mm × 0.8mm DFN Package