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. The low input offset voltage and low input bias current specifications along with the high open-loop gain make the MAX4289 well-suited to applications requiring a high degree of precision. The MAX4289 is available in a tiny 6-pin SOT23 package. All specifications are guaranteed over the extended temperature range of -40°C to +85°C.
The MAX4289 micropower operational amplifier is optimized for ultra‑low supply voltage operation and consumes only 9 µA of quiescent current. It is fully specified for single‑cell battery operation from 1.0 V to 5.5 V and offers rail‑to‑rail input and output, making it suitable for portable and low‑voltage applications.
The device is supplied in a tiny 6‑pin SOT‑23 package, operates over –40 °C to +85 °C, and provides specifications such as 0.2 mV input offset voltage, 5 nA input bias current, 17 kHz gain‑bandwidth product, and a 300 µs power‑up time. Typical applications include single‑cell battery‑powered instruments, sensor interfaces, and precision low‑voltage circuits.
| Quiescent Supply Current | 9 µA typ |
|---|---|
| Input Offset Voltage | ±0.2 mV |
| Input Bias Current | ±5 nA |
| Gain‑Bandwidth Product | 17 kHz |
| Slew Rate | 6 V/ms |
| Output Swing (high) | within 7 mV of rails |
| Power‑Up Time | 300 µs |
| Operating Temperature Range | -40 °C to +85 °C |
The MAX4289 typically draws 9 µA of quiescent supply current.
The device requires about 300 µs to power up, during which the output is indeterminate.
The op‑amp is unity‑gain stable for capacitive loads up to 200 pF.