Low I_BIAS, +1.4V/800nA, Rail-to-Rail Op Amps with +1.2V Buffered Reference

 

Part Number	Replacement	Explanation

Description

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The single MAX4036/MAX4037 and dual MAX4038/MAX4039 operational amplifiers operate from a single +1.4V to +3.6V (without reference) or +1.8V to +3.6V (with reference) supply and consume only 800nA of supply current per amplifier, and 1.1µA for the optional reference. The MAX4036/MAX4038 feature a common-mode input voltage range from 0V to V_DD - 0.4V at V_DD = 1.4V. The MAX4037/MAX4039 feature a 1.232V voltage reference capable of sourcing 100µA and sinking 20µA.

The MAX4036–MAX4039s' rail-to-rail outputs drive 5kΩ loads to within 25mV of the rails. Ultra-low supply current, low operating voltage, and rail-to-rail outputs make the MAX4036–MAX4039 ideal for use in single-cell lithium-ion (Li+), or two-cell NiCd/NiMH/alkaline battery-powered applications.

The MAX4036 is available in an SC70 package, the MAX4037 in a SOT23 package, and the MAX4038/MAX4039 in UCSP™, µMAX®, and TDFN packages.

MAX4036, MAX4037, MAX4038, MAX4039: Typical Operating Circuit Enlarge+

Key Features

• Ultra-Low 800nA per Amplifier Supply Current
• Ultra-Low 1.4V Supply Voltage Operation (1.8V for MAX4037/MAX4039)
• Rail-to-Rail Outputs Drive 5kΩ and 5000pF Load
• 1.232V ±0.5%, 120ppm/°C (max) Reference (MAX4037/MAX4039)
• No External Reference Bypass Capacitor Required
• No Phase Reversal for Overdriven Inputs
• Low 1.0pA (typ) Input Bias Current
• Low 200µV Input Offset Voltage
• Unity-Gain Stable
• Available in Tiny UCSP, SC70, SOT23, TDFN, and µMAX Packages
• Available in -40°C to +125°C Temperature Range (MAX4036A/MAX4038A)

Applications/Uses

• Active Badges
• Battery-Powered/Solar-Powered Systems
• Cellular Handsets
• Digital Cameras (DIGICAMs)
• Electrometer Amplifiers
• Glucose Meters
• GPS Solutions
• IP Camera
• Micropower Thermostats and Potentiostats
• MP3 and Portable Media Players
• Pagers and Cell Phones
• pH Meters
• Portable Medical Instrumentation
• Remote Sensor Amplifiers