Features

• 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

Typical Application

Description

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 x 3mm low profile(0.8mm) dual fine-pitch leadless package (DFN).