General Description

The MAX4289 micropower, operational amplifier is optimized for ultra-low supply voltage operation. The amplifier consumes only 9µA of quiescent supply current and is fully specified for operation from a single 1.0V to 5.5V power supply. This ultra-low voltage operation together with the low quiescent current consumption make the MAX4289 ideal for use in battery-powered systems operated from as little as a single alkaline cell. The MAX4289 also features a wide input common-mode range that includes the ground, and an output voltage swing that is virtually Rail-to-Rail®, allowing almost all of the power supply to be used for signal voltage.

Features

♦ Ultra-Low Voltage Operation: Guaranteed Specifications from 1.0V to 5.5V

♦ Input Common-Mode Range: 0 to (VCC - 0.2V)

♦ Ultra-Low Power Consumption: 9µA Supply Current (typ)

♦ Optimized for Operation from Single-Cell Battery-Powered Systems

♦ Compatible with 3.0V and 5.0V Single-Supply Systems

♦ Low Offset Voltage: 0.2mV

♦ Low Input Bias Current: 5nA

♦ High Open-Loop Voltage Gain: 90dB

♦ Rail-to-Rail Output Stage Drives 5kΩ Load

♦ No Output Phase Reversal for Overdriven Inputs

♦ Available in a Tiny 6-Pin SOT23 (3mm ✕ 3mm)

Applications

    Single-Cell Systems

    Portable Electronic Equipment

    Battery-Powered Instrumentation

    Hearing Aids Using Zinc Air Battery

    Strain Gauges

    Cellular Phones

    Notebook Computers

    Sensor Amplifiers

    Portable Communication Devices