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