The MAX4240-MAX4244 family of micropower op amps operate from a single +1.8V to +5.5V supply or dual ±0.9V to ±2.75V supplies and have Beyond-the-Rails™ inputs and rail-to-rail output capabilities. These ampli- fiers provide a 90kHz gain-bandwidth product while using only 10µA of supply current per amplifier. The MAX4241/MAX4243 have a low-power shutdown mode that reduces supply current to less than 1µA and forces the output into a high-impedance state. Although the minimum operating voltage is specified at +1.8V, these devices typically operate down to +1.5V. The combina- tion of ultra-low-voltage operation, beyond-the-rails inputs, rail-to-rail outputs, and ultra-low power con- sumption makes these devices ideal for any portable/ two-cell battery-powered system. These amplifiers have an input common-mode range that extends 200mV beyond each rail, and their out- puts typically swing to within 9mV of the rails with a 100kΩ load. Beyond-the-rails input and rail-to-rail out- put characteristics allow the full power-supply voltage to be used for signal range. The combination of low input offset voltage, low input bias current, and high open-loop gain makes them suitable for low-power/low- voltage precision applications. The MAX4240 is offered in a space-saving 5-pin SOT23 package. All specifications are guaranteed over the -40°C to +85°C extended temperature range.
The MAX4240–MAX4244 family are micropower operational amplifiers that operate from a single‑supply voltage of 1.8 V to 5.5 V or dual supplies of ±0.9 V to ±2.75 V. They feature Beyond‑the‑Rails™ inputs, rail‑to‑rail outputs, a 90 kHz gain‑bandwidth product and ultra‑low supply current (10 µA per amplifier, <1 µA in shutdown for MAX4241/MAX4243). These devices are intended for low‑voltage, battery‑powered applications such as portable electronics, sensor interfaces and precision instrumentation.
The datasheet provides absolute maximum ratings, detailed electrical characteristics, typical operating curves, pin configurations for SOT‑23, µMAX and SO packages, and application notes on layout, bypassing and using the amplifiers as comparators or current monitors. All specifications are guaranteed over an extended temperature range of –40 °C to +85 °C.
| Input Offset Voltage | ±0.20 mV (typical) |
|---|---|
| Input Bias Current | ±2 nA (typical) |
| Gain‑Bandwidth Product | 90 kHz |
| Output Swing | within 9 mV of the rails with 100 kΩ load |
| Operating Temperature Range | –40 °C to +85 °C |
The typical input offset voltage is ±0.20 mV.