1.8V, 50MHz, Low-Offset, Low-Power, Rail-to-Rail I/O Op Amp

High Bandwidth and Excellent VOS Accuracy Over Time and Temperature


The MAX44280 offers a unique combination of high speed, precision, low noise, and low-voltage operation making it ideally suited for a large number of signal processing functions such as filtering and amplification of signals in portable and industrial equipment.

The amplifier features an input offset of less than 50µV and a high-gain bandwidth product of 50MHz while maintaining a low 1.8V supply rail. The device is internally compensated for gains of 5V/V or greater. The device's rail-to-rail input/outputs and low noise guarantee maximum dynamic range in demanding applications such as 12- to 16-bit SAR ADC drivers. Unlike traditional rail-to-rail input structures, input crossover distortion is absent due to an optimized input stage with an ultra-quiet charge pump.

The MAX44280 includes a fast-power-on shutdown mode for further power savings.

The MAX44280 operates from a supply range of 1.8V to 5.5V over the -40°C to +125°C temperature range and can operate down to 1.7V over the 0°C to +70°C temperature range. The MAX44280 is available in a small, 6-pin SC70 package and is also available in a 1mm x 1.5mm thin µDFN (ultra-thin LGA) package.
MAX44280: Typical Application Circuit MAX44280: Typical Application Circuit Enlarge+

Key Features

  • Low 1.8V Supply Rail Over the -40°C to +125°C Range
  • 1.7V Supply Rail Over the 0°C to +70°C Range
  • 50MHz Bandwidth
  • Low 12.7nV/ Input Voltage-Noise Density
  • Low 1.2fA/ Input Current-Noise Density
  • Low 50µV (max) VOS at +25°C
  • 500fA Low Input Bias Current
  • 750µA Quiescent Current per Amplifier
  • < 1µA Supply Current in Shutdown
  • Small, 2mm x 2mm SC70 and 1mm x 1.5mm Thin µDFN Packages
  • Low -110dB Total Harmonic Distortion
  • 5V/V Minimum Stable Gain


  • 3G/4G Handsets
  • Analog-to-Digital Converter Buffers
  • Battery-Operated Devices
  • General-Purpose Signal Processing
  • Notebooks
  • Portable Media Players
  • Portable Medical Instruments
  • Transimpedance Amplifiers
Part Number Amps. Rail to Rail AV
ICC per Amp.
Low Input Bias CMOS Inputs Input IBIAS
Unity Gain BW
Slew Rate
Package/Pins Budgetary
min max typ max typ typ max typ typ < See Notes
MAX44280  1 Input/Output 5 1.7 5.5 750 50 90 95 Yes 0.0005 50 30 12.7
$0.85 @1k
See All Operational Amplifiers (168)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX44280EVKIT: Evaluation Kit for the MAX44280

Tools & Models

MAX44280 Macromodel
MAX44280 Orcad Library

Related Resources

Precision, Low-Power, and Low-Noise Op Amp with RRIO

  • Low 66μA Quiescent Current
  • Low Input Noise:
  • Rail-to-Rail Inputs and Outputs (RRIO)

Current and Voltage Sense with Power Measurement

  • High Accuracy Improves Measurement Quality
  • High Integration Saves Cost and Space
  • Single-Supply Range and Low Power Simplify Power-Supply Design